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-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_adc_sync.h287
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_atomic.h137
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_dac_sync.h134
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_delay.h99
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_flash.h219
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_gpio.h212
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_i2c_m_sync.h254
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_init.h82
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_io.h120
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_pwm.h161
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_sleep.h84
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_spi_m_sync.h220
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_timer.h216
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_usart_sync.h257
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hal_usb_device.h305
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_adc_async.h274
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_adc_dma.h253
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_adc_sync.h281
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_calendar.h252
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_core.h66
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_dac_async.h182
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_dac_sync.h148
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_delay.h88
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_dma.h167
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_flash.h228
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_gpio.h195
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_async.h215
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_sync.h195
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_async.h194
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_sync.h185
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_init.h134
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_irq.h126
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_missing_features.h47
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_pwm.h203
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_reset.h102
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_sleep.h98
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi.h173
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_async.h137
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_dma.h98
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_m_async.h248
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_m_dma.h187
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_m_sync.h171
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_s_async.h227
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_s_sync.h237
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_spi_sync.h80
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_time_measure.h104
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_timer.h170
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usart.h123
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usart_async.h280
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usart_sync.h253
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usb.h281
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usb_device.h387
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_usb_host.h628
-rw-r--r--atmel-samd/asf4/samd21/hal/include/hpl_user_area.h133
54 files changed, 10337 insertions, 0 deletions
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_adc_sync.h b/atmel-samd/asf4/samd21/hal/include/hal_adc_sync.h
new file mode 100644
index 000000000..fb4604aa5
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_adc_sync.h
@@ -0,0 +1,287 @@
+/**
+ * \file
+ *
+ * \brief ADC functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_ADC_SYNC_H_INCLUDED
+#define _HAL_ADC_SYNC_H_INCLUDED
+
+#include <hpl_adc_sync.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_adc_sync
+ *
+ * @{
+ */
+
+/**
+ * \brief ADC descriptor
+ *
+ * The ADC descriptor forward declaration.
+ */
+struct adc_sync_descriptor;
+
+/**
+ * \brief ADC descriptor
+ */
+struct adc_sync_descriptor {
+ /** ADC device */
+ struct _adc_sync_device device;
+};
+
+/**
+ * \brief Initialize ADC
+ *
+ * This function initializes the given ADC descriptor.
+ * It checks if the given hardware is not initialized and if the given hardware
+ * is permitted to be initialized.
+ *
+ * \param[out] descr An ADC descriptor to initialize
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] func The pointer to a set of functions pointers
+ *
+ * \return Initialization status.
+ */
+int32_t adc_sync_init(struct adc_sync_descriptor *const descr, void *const hw, void *const func);
+
+/**
+ * \brief Deinitialize ADC
+ *
+ * This function deinitializes the given ADC descriptor.
+ * It checks if the given hardware is initialized and if the given hardware is
+ * permitted to be deinitialized.
+ *
+ * \param[in] descr An ADC descriptor to deinitialize
+ *
+ * \return De-initialization status.
+ */
+int32_t adc_sync_deinit(struct adc_sync_descriptor *const descr);
+
+/**
+ * \brief Enable ADC
+ *
+ * Use this function to set the ADC peripheral to enabled state.
+ *
+ * \param[in] descr Pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ *
+ * \return Operation status
+ *
+ */
+int32_t adc_sync_enable_channel(struct adc_sync_descriptor *const descr, const uint8_t channel);
+
+/**
+ * \brief Disable ADC
+ *
+ * Use this function to set the ADC peripheral to disabled state.
+ *
+ * \param[in] descr Pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ *
+ * \return Operation status
+ *
+ */
+int32_t adc_sync_disable_channel(struct adc_sync_descriptor *const descr, const uint8_t channel);
+
+/**
+ * \brief Read data from ADC
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ * \param[in] buf A buffer to read data to
+ * \param[in] length The size of a buffer
+ *
+ * \return The number of bytes read.
+ */
+int32_t adc_sync_read_channel(struct adc_sync_descriptor *const descr, const uint8_t channel, uint8_t *const buffer,
+ const uint16_t length);
+
+/**
+ * \brief Set ADC reference source
+ *
+ * This function sets ADC reference source.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] reference A reference source to set
+ *
+ * \return Status of the ADC reference source setting.
+ */
+int32_t adc_sync_set_reference(struct adc_sync_descriptor *const descr, const adc_reference_t reference);
+
+/**
+ * \brief Set ADC resolution
+ *
+ * This function sets ADC resolution.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] resolution A resolution to set
+ *
+ * \return Status of the ADC resolution setting.
+ */
+int32_t adc_sync_set_resolution(struct adc_sync_descriptor *const descr, const adc_resolution_t resolution);
+
+/**
+ * \brief Set ADC input source of a channel
+ *
+ * This function sets ADC positive and negative input sources.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] pos_input A positive input source to set
+ * \param[in] neg_input A negative input source to set
+ * \param[in] channel Channel number
+ *
+ * \return Status of the ADC channels setting.
+ */
+int32_t adc_sync_set_inputs(struct adc_sync_descriptor *const descr, const adc_pos_input_t pos_input,
+ const adc_neg_input_t neg_input, const uint8_t channel);
+
+/**
+ * \brief Set ADC conversion mode
+ *
+ * This function sets ADC conversion mode.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] mode A conversion mode to set
+ *
+ * \return Status of the ADC conversion mode setting.
+ */
+int32_t adc_sync_set_conversion_mode(struct adc_sync_descriptor *const descr, const enum adc_conversion_mode mode);
+
+/**
+ * \brief Set ADC differential mode
+ *
+ * This function sets ADC differential mode.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ * \param[in] mode A differential mode to set
+ *
+ * \return Status of the ADC differential mode setting.
+ */
+int32_t adc_sync_set_channel_differential_mode(struct adc_sync_descriptor *const descr, const uint8_t channel,
+ const enum adc_differential_mode mode);
+
+/**
+ * \brief Set ADC channel gain
+ *
+ * This function sets ADC channel gain.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ * \param[in] gain A gain to set
+ *
+ * \return Status of the ADC gain setting.
+ */
+int32_t adc_sync_set_channel_gain(struct adc_sync_descriptor *const descr, const uint8_t channel,
+ const adc_gain_t gain);
+
+/**
+ * \brief Set ADC window mode
+ *
+ * This function sets ADC window mode.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] mode A window mode to set
+ *
+ * \return Status of the ADC window mode setting.
+ */
+int32_t adc_sync_set_window_mode(struct adc_sync_descriptor *const descr, const adc_window_mode_t mode);
+
+/**
+ * \brief Set ADC thresholds
+ *
+ * This function sets ADC positive and negative thresholds.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] low_threshold A lower thresholds to set
+ * \param[in] up_threshold An upper thresholds to set
+ *
+ * \return Status of the ADC thresholds setting.
+ */
+int32_t adc_sync_set_thresholds(struct adc_sync_descriptor *const descr, const adc_threshold_t low_threshold,
+ const adc_threshold_t up_threshold);
+
+/**
+ * \brief Retrieve threshold state
+ *
+ * This function retrieves ADC threshold state.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[out] state The threshold state
+ *
+ * \return The state of ADC thresholds state retrieving.
+ */
+int32_t adc_sync_get_threshold_state(const struct adc_sync_descriptor *const descr,
+ adc_threshold_status_t *const state);
+
+/**
+ * \brief Check if conversion is complete
+ *
+ * This function checks if the ADC has finished the conversion.
+ *
+ * \param[in] descr The pointer to the ADC descriptor
+ * \param[in] channel Channel number
+ *
+ * \return The status of ADC conversion completion checking.
+ * \retval 1 The conversion is complete
+ * \retval 0 The conversion is not complete
+ */
+int32_t adc_sync_is_channel_conversion_complete(const struct adc_sync_descriptor *const descr, const uint8_t channel);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t adc_sync_get_version(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#include <hpl_missing_features.h>
+
+#endif /* _HAL_ADC_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_atomic.h b/atmel-samd/asf4/samd21/hal/include/hal_atomic.h
new file mode 100644
index 000000000..8a51b2a96
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_atomic.h
@@ -0,0 +1,137 @@
+/**
+ * \file
+ *
+ * \brief Critical sections related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_ATOMIC_H_INCLUDED
+#define _HAL_ATOMIC_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_helper_atomic
+ *
+ *@{
+ */
+
+/**
+ * \brief Type for the register holding global interrupt enable flag
+ */
+typedef uint32_t hal_atomic_t;
+
+/**
+ * \brief Helper macro for entering critical sections
+ *
+ * This macro is recommended to be used instead of a direct call
+ * hal_enterCritical() function to enter critical
+ * sections. No semicolon is required after the macro.
+ *
+ * \section atomic_usage Usage Example
+ * \code
+ * CRITICAL_SECTION_ENTER()
+ * Critical code
+ * CRITICAL_SECTION_LEAVE()
+ * \endcode
+ */
+#define CRITICAL_SECTION_ENTER() \
+ { \
+ volatile hal_atomic_t __atomic; \
+ atomic_enter_critical(&__atomic);
+
+/**
+ * \brief Helper macro for leaving critical sections
+ *
+ * This macro is recommended to be used instead of a direct call
+ * hal_leaveCritical() function to leave critical
+ * sections. No semicolon is required after the macro.
+ *
+ * \section atomic_usage Usage Example
+ * \code
+ * CRITICAL_SECTION_ENTER()
+ * Some critical code
+ * CRITICAL_SECTION_LEAVE()
+ * \endcode
+ */
+#define CRITICAL_SECTION_LEAVE() \
+ atomic_leave_critical(&__atomic); \
+ }
+
+/**
+ * \brief Disable interrupts, enter critical section
+ *
+ * Disables global interrupts. Supports nested critical sections,
+ * so that global interrupts are only re-enabled
+ * upon leaving the outermost nested critical section.
+ *
+ * \param[out] atomic The pointer to a variable to store the value of global
+ * interrupt enable flag
+ */
+void atomic_enter_critical(hal_atomic_t volatile *atomic);
+
+/**
+ * \brief Exit atomic section
+ *
+ * Enables global interrupts. Supports nested critical sections,
+ * so that global interrupts are only re-enabled
+ * upon leaving the outermost nested critical section.
+ *
+ * \param[in] atomic The pointer to a variable, which stores the latest stored
+ * value of the global interrupt enable flag
+ */
+void atomic_leave_critical(hal_atomic_t volatile *atomic);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t atomic_get_version(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HAL_ATOMIC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_dac_sync.h b/atmel-samd/asf4/samd21/hal/include/hal_dac_sync.h
new file mode 100644
index 000000000..79c68b2cb
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_dac_sync.h
@@ -0,0 +1,134 @@
+/**
+ * \file
+ *
+ * \brief DAC functionality declaration.
+ *
+ * Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef HAL_SYNC_DAC_H_INCLUDED
+#define HAL_SYNC_DAC_H_INCLUDED
+
+#include <hpl_dac_sync.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_dac_sync
+ *
+ *@{
+ */
+
+/**
+ * \brief DAC synchronous descriptor.
+ *
+ * The DAC descriptor forward declaration.
+ */
+struct dac_sync_descriptor;
+
+/**
+ * \brief DAC synchronous channel descriptor.
+ *
+ */
+struct dac_sync_channel {
+ /** Pointer to buffer what to be converted */
+ uint16_t *buffer;
+ /** The length of buffer */
+ uint32_t length;
+};
+
+/**
+ * \brief DAC synchronous descriptor
+ */
+struct dac_sync_descriptor {
+ /** DAC device */
+ struct _dac_sync_device device;
+ /** DAC selected channel */
+ struct dac_sync_channel sel_ch[CHANNEL_NUM];
+};
+
+/** \brief Initialize the DAC HAL instance and hardware.
+ * \param[out] descr A DAC descriptor to initialize
+ * \param[in] hw The pointer to hardware instance
+ * \return Operation status.
+ */
+int32_t dac_sync_init(struct dac_sync_descriptor *const descr, void *const hw);
+
+/** \brief Deinitialize the DAC HAL instance and hardware.
+ * \param[in] descr Pointer to the HAL DAC descriptor
+ * \return Operation status.
+ */
+int32_t dac_sync_deinit(struct dac_sync_descriptor *const descr);
+
+/** \brief Enable DAC channel.
+ * \param[in] descr Pointer to the HAL DAC descriptor
+ * \param[in] ch Channel number
+ * \return Operation status.
+ */
+int32_t dac_sync_enable_channel(struct dac_sync_descriptor *const descr, const uint8_t ch);
+
+/** \brief Disable DAC channel.
+ * \param[in] descr Pointer to the HAL DAC descriptor
+ * \param[in] ch Channel number
+ * \return Operation status.
+ */
+int32_t dac_sync_disable_channel(struct dac_sync_descriptor *const descr, const uint8_t ch);
+
+/** \brief DAC converts digital data to analog output.
+ * \param[in] descr Pointer to the HAL DAC descriptor
+ * \param[in] ch the Channel selected to output
+ * \param[in] buffer Pointer to digital data or buffer
+ * \param[in] length The number of elements in the buffer
+ * \return Operation status.
+ */
+int32_t dac_sync_write(struct dac_sync_descriptor *const descr, const uint8_t ch, uint16_t *buffer, uint32_t length);
+
+/** \brief Get DAC driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t dac_sync_get_version(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_DAC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_delay.h b/atmel-samd/asf4/samd21/hal/include/hal_delay.h
new file mode 100644
index 000000000..48fee826f
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_delay.h
@@ -0,0 +1,99 @@
+/**
+ * \file
+ *
+ * \brief HAL delay related functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#include <hpl_irq.h>
+#include <hpl_reset.h>
+#include <hpl_sleep.h>
+
+#ifndef _HAL_DELAY_H_INCLUDED
+#define _HAL_DELAY_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_delay Delay Driver
+ *
+ *@{
+ */
+
+/**
+ * \brief Initialize Delay driver
+ *
+ * \param[in] hw The pointer to hardware instance
+ */
+void delay_init(void *const hw);
+
+/**
+ * \brief Perform delay in us
+ *
+ * This function performs delay for the given amount of microseconds.
+ *
+ * \param[in] us The amount delay in us
+ */
+void delay_us(const uint16_t us);
+
+/**
+ * \brief Perform delay in ms
+ *
+ * This function performs delay for the given amount of milliseconds.
+ *
+ * \param[in] ms The amount delay in ms
+ */
+void delay_ms(const uint16_t ms);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t delay_get_version(void);
+
+/**@}*/
+#ifdef __cplusplus
+}
+#endif
+#endif /* _HAL_DELAY_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_flash.h b/atmel-samd/asf4/samd21/hal/include/hal_flash.h
new file mode 100644
index 000000000..2e6286389
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_flash.h
@@ -0,0 +1,219 @@
+/**
+ * \file
+ *
+ * \brief Flash related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_FLASH_H_INCLUDED
+#define _HAL_FLASH_H_INCLUDED
+
+#include <hpl_flash.h>
+
+/**
+ * \addtogroup doc_driver_hal_flash
+ *
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Forward declaration of flash_descriptor. */
+struct flash_descriptor;
+
+/** The callback types */
+enum flash_cb_type {
+ /** Callback type for ready to accept a new command */
+ FLASH_CB_READY,
+ /** Callback type for error */
+ FLASH_CB_ERROR,
+ FLASH_CB_N
+};
+
+/** \brief Prototype of callback on FLASH
+ *
+ */
+typedef void (*flash_cb_t)(struct flash_descriptor *const descr);
+
+/** \brief FLASH HAL callbacks
+ *
+ */
+struct flash_callbacks {
+ /** Callback invoked when ready to accept a new command */
+ flash_cb_t cb_ready;
+ /** Callback invoked when error occurs */
+ flash_cb_t cb_error;
+};
+
+/** \brief FLASH HAL driver struct for asynchronous access
+ */
+struct flash_descriptor {
+ /** Pointer to FLASH device instance */
+ struct _flash_device dev;
+ /** Callbacks for asynchronous transfer */
+ struct flash_callbacks callbacks;
+};
+
+/** \brief Initialize the FLASH HAL instance and hardware for callback mode
+ *
+ * Initialize FLASH HAL with interrupt mode (uses callbacks).
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \return Initialize status.
+ */
+int32_t flash_init(struct flash_descriptor *flash, void *const hw);
+
+/** \brief Deinitialize the FLASH HAL instance
+ *
+ * Abort transfer, disable and reset FLASH, and deinitialize software.
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \return Deinitialze status.
+ */
+int32_t flash_deinit(struct flash_descriptor *flash);
+
+/** \brief Writes a number of bytes to a page in the internal Flash
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] dst_addr Destination bytes address to write into flash
+ * \param[in] buffer Pointer to a buffer where the content
+ * will be written to the flash
+ * \param[in] length Number of bytes to write
+ * \return Write status.
+ */
+int32_t flash_write(struct flash_descriptor *flash, uint32_t dst_addr, uint8_t *buffer, uint32_t length);
+
+/** \brief Appends a number of bytes to a page in the internal Flash
+ *
+ * This functions never erases the flash before writing.
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] dst_addr Destination bytes address to write to flash
+ * \param[in] buffer Pointer to a buffer with data to write to flash
+ * \param[in] length Number of bytes to append
+ * \return Append status.
+ */
+int32_t flash_append(struct flash_descriptor *flash, uint32_t dst_addr, uint8_t *buffer, uint32_t length);
+
+/** \brief Reads a number of bytes to a page in the internal Flash
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] src_addr Source bytes address to read from flash
+ * \param[out] buffer Pointer to a buffer where the content
+ * of the read pages will be stored
+ * \param[in] length Number of bytes to read
+ * \return Read status.
+ */
+int32_t flash_read(struct flash_descriptor *flash, uint32_t src_addr, uint8_t *buffer, uint32_t length);
+
+/** \brief Register a function as FLASH transfer completion callback
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] type Callback type (\ref flash_cb_type).
+ * \param[in] func Pointer to callback function.
+ * \retval 0 Success
+ * \retval -1 Error
+ */
+int32_t flash_register_callback(struct flash_descriptor *flash, const enum flash_cb_type type, flash_cb_t func);
+
+/** \brief Execute lock in the internal flash
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be locked
+ * \param[in] page_nums Number of pages to be locked
+ *
+ * \return Real locked numbers of pages.
+ */
+int32_t flash_lock(struct flash_descriptor *flash, const uint32_t dst_addr, const uint32_t page_nums);
+
+/** \brief Execute unlock in the internal flash
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be unlocked
+ * \param[in] page_nums Number of pages to be unlocked
+ *
+ * \return Real unlocked numbers of pages.
+ */
+int32_t flash_unlock(struct flash_descriptor *flash, const uint32_t dst_addr, const uint32_t page_nums);
+
+/** \brief Execute erase in the internal flash
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be erased
+ * \param[in] page_nums Number of pages to be erased
+ * \retval 0 Success
+ * \retval -1 Error
+ */
+int32_t flash_erase(struct flash_descriptor *flash, const uint32_t dst_addr, const uint32_t page_nums);
+
+/**
+ * \brief Get the flash page size
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance
+ *
+ * \return The flash page size
+ */
+uint32_t flash_get_page_size(struct flash_descriptor *flash);
+
+/**
+ * \brief Get the number of flash page
+ *
+ * \param[in, out] flash Pointer to the HAL FLASH instance.
+ *
+ * \return The flash total page numbers
+ */
+uint32_t flash_get_total_pages(struct flash_descriptor *flash);
+
+/** \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t flash_get_version(void);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* ifndef _HAL_FLASH_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_gpio.h b/atmel-samd/asf4/samd21/hal/include/hal_gpio.h
new file mode 100644
index 000000000..f0e8af8d7
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_gpio.h
@@ -0,0 +1,212 @@
+/**
+ * \file
+ *
+ * \brief Port
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ */
+#ifndef _HAL_GPIO_INCLUDED_
+#define _HAL_GPIO_INCLUDED_
+
+#include <hpl_gpio.h>
+#include <utils_assert.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Set gpio pull mode
+ *
+ * Set pin pull mode, non existing pull modes throws an fatal assert
+ *
+ * \param[in] pin The pin number for device
+ * \param[in] pull_mode GPIO_PULL_DOWN = Pull pin high with internal
+ * resistor
+ * GPIO_PULL_UP = Pull pin low with internal resistor
+ * GPIO_PULL_OFF = Disable pin pull mode
+ */
+static inline void gpio_set_pin_pull_mode(const uint8_t pin, const enum gpio_pull_mode pull_mode)
+{
+ _gpio_set_pin_pull_mode((enum gpio_port)GPIO_PORT(pin), pin & 0x1F, pull_mode);
+}
+
+/**
+ * \brief Set pin function
+ *
+ * Select which function a pin will be used for
+ *
+ * \param[in] pin The pin number for device
+ * \param[in] function The pin function is given by a 32-bit wide bitfield
+ * found in the header files for the device
+ *
+ */
+static inline void gpio_set_pin_function(const uint32_t pin, uint32_t function)
+{
+ _gpio_set_pin_function(pin, function);
+}
+
+/**
+ * \brief Set port data direction
+ *
+ * Select if the pin data direction is input, output or disabled.
+ * If disabled state is not possible, this function throws an assert.
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means apply direction setting to the
+ * corresponding pin
+ * \param[in] direction GPIO_DIRECTION_IN = Data direction in
+ * GPIO_DIRECTION_OUT = Data direction out
+ * GPIO_DIRECTION_OFF = Disables the pin
+ * (low power state)
+ */
+static inline void gpio_set_port_direction(const enum gpio_port port, const uint32_t mask,
+ const enum gpio_direction direction)
+{
+ _gpio_set_direction(port, mask, direction);
+}
+
+/**
+ * \brief Set gpio data direction
+ *
+ * Select if the pin data direction is input, output or disabled.
+ * If disabled state is not possible, this function throws an assert.
+ *
+ * \param[in] pin The pin number for device
+ * \param[in] direction GPIO_DIRECTION_IN = Data direction in
+ * GPIO_DIRECTION_OUT = Data direction out
+ * GPIO_DIRECTION_OFF = Disables the pin
+ * (low power state)
+ */
+static inline void gpio_set_pin_direction(const uint8_t pin, const enum gpio_direction direction)
+{
+ _gpio_set_direction((enum gpio_port)GPIO_PORT(pin), 1U << GPIO_PIN(pin), direction);
+}
+
+/**
+ * \brief Set port level
+ *
+ * Sets output level on the pins defined by the bit mask
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means apply port level to the corresponding
+ * pin
+ * \param[in] level true = Pin levels set to "high" state
+ * false = Pin levels set to "low" state
+ */
+static inline void gpio_set_port_level(const enum gpio_port port, const uint32_t mask, const bool level)
+{
+ _gpio_set_level(port, mask, level);
+}
+
+/**
+ * \brief Set gpio level
+ *
+ * Sets output level on a pin
+ *
+ * \param[in] pin The pin number for device
+ * \param[in] level true = Pin level set to "high" state
+ * false = Pin level set to "low" state
+ */
+static inline void gpio_set_pin_level(const uint8_t pin, const bool level)
+{
+ _gpio_set_level((enum gpio_port)GPIO_PORT(pin), 1U << GPIO_PIN(pin), level);
+}
+
+/**
+ * \brief Toggle out level on pins
+ *
+ * Toggle the pin levels on pins defined by bit mask
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means toggle pin level to the corresponding
+ * pin
+ */
+static inline void gpio_toggle_port_level(const enum gpio_port port, const uint32_t mask)
+{
+ _gpio_toggle_level(port, mask);
+}
+
+/**
+ * \brief Toggle output level on pin
+ *
+ * Toggle the pin levels on pins defined by bit mask
+ *
+ * \param[in] pin The pin number for device
+ */
+static inline void gpio_toggle_pin_level(const uint8_t pin)
+{
+ _gpio_toggle_level((enum gpio_port)GPIO_PORT(pin), 1U << GPIO_PIN(pin));
+}
+
+/**
+ * \brief Get input level on pins
+ *
+ * Read the input level on pins connected to a port
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ */
+static inline uint32_t gpio_get_port_level(const enum gpio_port port)
+{
+ return _gpio_get_level(port);
+}
+
+/**
+ * \brief Get level on pin
+ *
+ * Reads the level on pins connected to a port
+ *
+ * \param[in] pin The pin number for device
+ */
+static inline bool gpio_get_pin_level(const uint8_t pin)
+{
+ return (bool)(_gpio_get_level((enum gpio_port)GPIO_PORT(pin)) & (0x01U << GPIO_PIN(pin)));
+}
+/**
+ * \brief Get current driver version
+ */
+uint32_t gpio_get_version(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_i2c_m_sync.h b/atmel-samd/asf4/samd21/hal/include/hal_i2c_m_sync.h
new file mode 100644
index 000000000..65741831a
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_i2c_m_sync.h
@@ -0,0 +1,254 @@
+/**
+ * \file
+ *
+ * \brief Sync I2C Hardware Abstraction Layer(HAL) declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_I2C_M_SYNC_H_INCLUDED
+#define _HAL_I2C_M_SYNC_H_INCLUDED
+
+#include <hpl_i2c_m_sync.h>
+#include <hal_io.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_i2c_master_sync
+ *
+ * @{
+ */
+
+#define I2C_M_MAX_RETRY 1
+
+/**
+ * \brief I2C descriptor structure, embed i2c_device & i2c_interface
+ */
+struct i2c_m_sync_desc {
+ struct _i2c_m_sync_device device;
+ struct io_descriptor io;
+ uint16_t slave_addr;
+};
+
+/**
+ * \brief Initialize synchronous I2C interface
+ *
+ * This function initializes the given I/O descriptor to be used as a
+ * synchronous I2C interface descriptor.
+ * It checks if the given hardware is not initialized and if the given hardware
+ * is permitted to be initialized.
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status.
+ * \retval -1 The passed parameters were invalid or the interface is already initialized
+ * \retval 0 The initialization is completed successfully
+ */
+int32_t i2c_m_sync_init(struct i2c_m_sync_desc *i2c, void *hw);
+
+/**
+ * \brief Deinitialize I2C interface
+ *
+ * This function deinitializes the given I/O descriptor.
+ * It checks if the given hardware is initialized and if the given hardware is permitted to be deinitialized.
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ *
+ * \return Uninitialization status.
+ * \retval -1 The passed parameters were invalid or the interface is already deinitialized
+ * \retval 0 The de-initialization is completed successfully
+ */
+int32_t i2c_m_sync_deinit(struct i2c_m_sync_desc *i2c);
+
+/**
+ * \brief Set the slave device address
+ *
+ * This function sets the next transfer target slave I2C device address.
+ * It takes no effect to any already started access.
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] addr The slave address to access
+ * \param[in] addr_len The slave address length, can be I2C_M_TEN or I2C_M_SEVEN
+ *
+ * \return Masked slave address. The mask is a maximum 10-bit address, and 10th
+ * bit is set if a 10-bit address is used
+ */
+int32_t i2c_m_sync_set_slaveaddr(struct i2c_m_sync_desc *i2c, int16_t addr, int32_t addr_len);
+
+/**
+ * \brief Set baudrate
+ *
+ * This function sets the I2C device to the specified baudrate.
+ * It only takes effect when the hardware is disabled.
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] clkrate Unused parameter. Should always be 0
+ * \param[in] baudrate The baudrate value set to master
+ *
+ * \return Whether successfully set the baudrate
+ * \retval -1 The passed parameters were invalid or the device is already enabled
+ * \retval 0 The baudrate set is completed successfully
+ */
+int32_t i2c_m_sync_set_baudrate(struct i2c_m_sync_desc *i2c, uint32_t clkrate, uint32_t baudrate);
+
+/**
+ * \brief Sync version of enable hardware
+ *
+ * This function enables the I2C device, and then waits for this enabling operation to be done
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ *
+ * \return Whether successfully enable the device
+ * \retval -1 The passed parameters were invalid or the device enable failed
+ * \retval 0 The hardware enabling is completed successfully
+ */
+int32_t i2c_m_sync_enable(struct i2c_m_sync_desc *i2c);
+
+/**
+ * \brief Sync version of disable hardware
+ *
+ * This function disables the I2C device and then waits for this disabling operation to be done
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ *
+ * \return Whether successfully disable the device
+ * \retval -1 The passed parameters were invalid or the device disable failed
+ * \retval 0 The hardware disabling is completed successfully
+ */
+int32_t i2c_m_sync_disable(struct i2c_m_sync_desc *i2c);
+
+/**
+ * \brief Sync version of write command to I2C slave
+ *
+ * This function will write the value to a specified register in the I2C slave device and
+ * then wait for this operation to be done.
+ *
+ * The sequence of this routine is
+ * sta->address(write)->ack->reg address->ack->resta->address(write)->ack->reg value->nack->stt
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] reg The internal address/register of the I2C slave device
+ * \param[in] buffer The buffer holding data to write to the I2C slave device
+ * \param[in] length The length (in bytes) to write to the I2C slave device
+ *
+ * \return Whether successfully write to the device
+ * \retval <0 The passed parameters were invalid or write fail
+ * \retval 0 Writing to register is completed successfully
+ */
+int32_t i2c_m_sync_cmd_write(struct i2c_m_sync_desc *i2c, uint8_t reg, uint8_t *buffer, uint8_t length);
+
+/**
+ * \brief Sync version of read register value from I2C slave
+ *
+ * This function will read a byte value from a specified register in the I2C slave device and
+ * then wait for this operation to be done.
+ *
+ * The sequence of this routine is
+ * sta->address(write)->ack->reg address->ack->resta->address(read)->ack->reg value->nack->stt
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] reg The internal address/register of the I2C slave device
+ * \param[in] buffer The buffer to hold the read data from the I2C slave device
+ * \param[in] length The length (in bytes) to read from the I2C slave device
+ *
+ * \return Whether successfully read from the device
+ * \retval <0 The passed parameters were invalid or read fail
+ * \retval 0 Reading from register is completed successfully
+ */
+int32_t i2c_m_sync_cmd_read(struct i2c_m_sync_desc *i2c, uint8_t reg, uint8_t *buffer, uint8_t length);
+
+/**
+ * \brief Sync version of transfer message to/from the I2C slave
+ *
+ * This function will transfer a message between the I2C slave and the master. This function will wait for the operation
+ * to be done.
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ * \param[in] msg An i2c_m_msg struct
+ *
+ * \return The status of the operation
+ * \retval 0 Operation completed successfully
+ * \retval <0 Operation failed
+ */
+int32_t i2c_m_sync_transfer(struct i2c_m_sync_desc *const i2c, struct _i2c_m_msg *msg);
+
+/**
+ * \brief Sync version of send stop condition on the i2c bus
+ *
+ * This function will create a stop condition on the i2c bus to release the bus
+ *
+ * \param[in] i2c An I2C descriptor, which is used to communicate through I2C
+ *
+ * \return The status of the operation
+ * \retval 0 Operation completed successfully
+ * \retval <0 Operation failed
+ */
+int32_t i2c_m_sync_send_stop(struct i2c_m_sync_desc *const i2c);
+
+/**
+ * \brief Return I/O descriptor for this I2C instance
+ *
+ * This function will return a I/O instance for this I2C driver instance
+ *
+ * \param[in] i2c_m_sync_desc An I2C descriptor, which is used to communicate through I2C
+ * \param[in] io_descriptor A pointer to an I/O descriptor pointer type
+ *
+ * \return Error code
+ * \retval 0 No error detected
+ * \retval <0 Error code
+ */
+int32_t i2c_m_sync_get_io_descriptor(struct i2c_m_sync_desc *const i2c, struct io_descriptor **io);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t i2c_m_sync_get_version(void);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_init.h b/atmel-samd/asf4/samd21/hal/include/hal_init.h
new file mode 100644
index 000000000..a970943eb
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_init.h
@@ -0,0 +1,82 @@
+/**
+ * \file
+ *
+ * \brief HAL initialization related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_INIT_H_INCLUDED
+#define _HAL_INIT_H_INCLUDED
+
+#include <hpl_init.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_helper_init Init Driver
+ *
+ *@{
+ */
+
+/**
+ * \brief Initialize the hardware abstraction layer
+ *
+ * This function calls the various initialization functions.
+ * Currently the following initialization functions are supported:
+ * - System clock initialization
+ */
+static inline void init_mcu(void)
+{
+ _init_chip();
+}
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t init_get_version(void);
+
+/**@}*/
+#ifdef __cplusplus
+}
+#endif
+#endif /* _HAL_INIT_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_io.h b/atmel-samd/asf4/samd21/hal/include/hal_io.h
new file mode 100644
index 000000000..e8005e3db
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_io.h
@@ -0,0 +1,120 @@
+/**
+ * \file
+ *
+ * \brief I/O related functionality declaration.
+ *
+ * Copyright (C) 2014 - 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_IO_INCLUDED
+#define _HAL_IO_INCLUDED
+
+/**
+ * \addtogroup doc_driver_hal_helper_io I/O Driver
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief I/O descriptor
+ *
+ * The I/O descriptor forward declaration.
+ */
+struct io_descriptor;
+
+/**
+ * \brief I/O write function pointer type
+ */
+typedef int32_t (*io_write_t)(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length);
+
+/**
+ * \brief I/O read function pointer type
+ */
+typedef int32_t (*io_read_t)(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length);
+
+/**
+ * \brief I/O descriptor
+ */
+struct io_descriptor {
+ io_write_t write; /*! The write function pointer. */
+ io_read_t read; /*! The read function pointer. */
+};
+
+/**
+ * \brief I/O write interface
+ *
+ * This function writes up to \p length of bytes to a given I/O descriptor.
+ * It returns the number of bytes actually write.
+ *
+ * \param[in] descr An I/O descriptor to write
+ * \param[in] buf The buffer pointer to story the write data
+ * \param[in] length The number of bytes to write
+ *
+ * \return The number of bytes written
+ */
+int32_t io_write(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length);
+
+/**
+ * \brief I/O read interface
+ *
+ * This function reads up to \p length bytes from a given I/O descriptor, and
+ * stores it in the buffer pointed to by \p buf. It returns the number of bytes
+ * actually read.
+ *
+ * \param[in] descr An I/O descriptor to read
+ * \param[in] buf The buffer pointer to story the read data
+ * \param[in] length The number of bytes to read
+ *
+ * \return The number of bytes actually read. This number can be less than the
+ * requested length. E.g., in a driver that uses ring buffer for
+ * reception, it may depend on the availability of data in the
+ * ring buffer.
+ */
+int32_t io_read(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HAL_IO_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_pwm.h b/atmel-samd/asf4/samd21/hal/include/hal_pwm.h
new file mode 100644
index 000000000..29efc4bc4
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_pwm.h
@@ -0,0 +1,161 @@
+/**
+ * \file
+ *
+ * \brief PWM functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef HAL_PWM_H_INCLUDED
+#define HAL_PWM_H_INCLUDED
+
+#include <hpl_pwm.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_pwm_async
+ *
+ *@{
+ */
+
+/**
+ * \brief PWM descriptor
+ *
+ * The PWM descriptor forward declaration.
+ */
+struct pwm_descriptor;
+
+/**
+ * \brief PWM callback type
+ */
+typedef void (*pwm_cb_t)(const struct pwm_descriptor *const descr);
+
+/**
+ * \brief PWM callback types
+ */
+enum pwm_callback_type { PWM_PERIOD_CB, PWM_ERROR_CB };
+
+/**
+ * \brief PWM callbacks
+ */
+struct pwm_callbacks {
+ pwm_cb_t period;
+ pwm_cb_t error;
+};
+
+/** \brief PWM descriptor
+ */
+struct pwm_descriptor {
+ /** PWM device */
+ struct _pwm_device device;
+ /** PWM callback structure */
+ struct pwm_callbacks pwm_cb;
+};
+
+/** \brief Initialize the PWM HAL instance and hardware
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] func The pointer to a set of functions pointers
+ *
+ * \return Operation status.
+ */
+int32_t pwm_init(struct pwm_descriptor *const descr, void *const hw, struct _pwm_hpl_interface *const func);
+
+/** \brief Deinitialize the PWM HAL instance and hardware
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ *
+ * \return Operation status.
+ */
+int32_t pwm_deinit(struct pwm_descriptor *const descr);
+
+/** \brief PWM output start
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ *
+ * \return Operation status.
+ */
+int32_t pwm_enable(struct pwm_descriptor *const descr);
+
+/** \brief PWM output stop
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ *
+ * \return Operation status.
+ */
+int32_t pwm_disable(struct pwm_descriptor *const descr);
+
+/** \brief Register PWM callback
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ * \param[in] type Callback type
+ * \param[in] cb A callback function, passing NULL de-registers callback
+ *
+ * \return Operation status.
+ * \retval 0 Success
+ * \retval -1 Error
+ */
+int32_t pwm_register_callback(struct pwm_descriptor *const descr, enum pwm_callback_type type, pwm_cb_t cb);
+
+/** \brief Change PWM parameter
+ *
+ * \param[in] descr Pointer to the HAL PWM descriptor
+ * \param[in] period Total period of one PWM cycle
+ * \param[in] duty_cycle Period of PWM first half during one cycle
+ *
+ * \return Operation status.
+ */
+int32_t pwm_set_parameters(struct pwm_descriptor *const descr, const pwm_period_t period,
+ const pwm_period_t duty_cycle);
+
+/** \brief Get PWM driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t pwm_get_version(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_PWM;_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_sleep.h b/atmel-samd/asf4/samd21/hal/include/hal_sleep.h
new file mode 100644
index 000000000..0a11856b1
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_sleep.h
@@ -0,0 +1,84 @@
+/**
+ * \file
+ *
+ * \brief Sleep related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_SLEEP_H_INCLUDED
+#define _HAL_SLEEP_H_INCLUDED
+
+#include <hpl_sleep.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_helper_sleep
+ *
+ *@{
+ */
+
+/**
+ * \brief Set the sleep mode of the device and put the MCU to sleep
+ *
+ * For an overview of which systems are disabled in sleep for the different
+ * sleep modes, see the data sheet.
+ *
+ * \param[in] mode Sleep mode to use
+ *
+ * \return The status of a sleep request
+ * \retval -1 The requested sleep mode was invalid or not available
+ * \retval 0 The operation completed successfully, returned after leaving the
+ * sleep
+ */
+int sleep(const uint8_t mode);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t sleep_get_version(void);
+/**@}*/
+#ifdef __cplusplus
+}
+#endif
+#endif /* _HAL_SLEEP_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_spi_m_sync.h b/atmel-samd/asf4/samd21/hal/include/hal_spi_m_sync.h
new file mode 100644
index 000000000..2c630ff09
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_spi_m_sync.h
@@ -0,0 +1,220 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_SPI_M_SYNC_H_INCLUDED
+#define _HAL_SPI_M_SYNC_H_INCLUDED
+
+#include <hal_io.h>
+#include <hpl_spi_m_sync.h>
+
+/**
+ * \addtogroup doc_driver_hal_spi_master_sync
+ *
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \brief SPI HAL driver struct for polling mode
+ *
+ */
+struct spi_m_sync_descriptor {
+ /** SPI device instance */
+ struct _spi_sync_dev dev;
+ /** I/O read/write */
+ struct io_descriptor io;
+ /** Flags for HAL driver */
+ uint16_t flags;
+};
+
+/** \brief Initialize SPI HAL instance and hardware for polling mode
+ *
+ * Initialize SPI HAL with polling mode.
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ * \param[in] hw Pointer to the hardware base.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_INVALID_DATA Error, initialized.
+ */
+int32_t spi_m_sync_init(struct spi_m_sync_descriptor *spi, void *const hw);
+
+/** \brief Deinitialize the SPI HAL instance and hardware
+ *
+ * Abort transfer, disable and reset SPI, deinit software.
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval <0 Error code.
+ */
+void spi_m_sync_deinit(struct spi_m_sync_descriptor *spi);
+
+/** \brief Enable SPI
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval <0 Error code.
+ */
+void spi_m_sync_enable(struct spi_m_sync_descriptor *spi);
+
+/** \brief Disable SPI
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval <0 Error code.
+ */
+void spi_m_sync_disable(struct spi_m_sync_descriptor *spi);
+
+/** \brief Set SPI baudrate
+ *
+ * Works if SPI is initialized as master, it sets the baudrate.
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ * \param[in] baud_val The target baudrate value
+ * (see "baudrate calculation" for calculating the value).
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_BUSY Busy
+ * \retval ERR_INVALID_ARG The baudrate is not supported.
+ */
+int32_t spi_m_sync_set_baudrate(struct spi_m_sync_descriptor *spi, const uint32_t baud_val);
+
+/** \brief Set SPI mode
+ *
+ * Set the SPI transfer mode (\ref spi_transfer_mode),
+ * which controls the clock polarity and clock phase:
+ * - Mode 0: leading edge is rising edge, data sample on leading edge.
+ * - Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * - Mode 2: leading edge is falling edge, data sample on leading edge.
+ * - Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ * \param[in] mode The mode (0~3).
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_BUSY Busy
+ * \retval ERR_INVALID_ARG The mode is not supported.
+ */
+int32_t spi_m_sync_set_mode(struct spi_m_sync_descriptor *spi, const enum spi_transfer_mode mode);
+
+/** \brief Set SPI transfer character size in number of bits
+ *
+ * The character size (\ref spi_char_size) influence the way the data is
+ * sent/received.
+ * For char size <= 8-bit, data is stored byte by byte.
+ * For char size between 9-bit ~ 16-bit, data is stored in 2-byte length.
+ * Note that the default and recommended char size is 8-bit since it's
+ * supported by all system.
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ * \param[in] char_size The char size (~16, recommended 8).
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_BUSY Busy
+ * \retval ERR_INVALID_ARG The char size is not supported.
+ */
+int32_t spi_m_sync_set_char_size(struct spi_m_sync_descriptor *spi, const enum spi_char_size char_size);
+
+/** \brief Set SPI transfer data order
+ *
+ * \param[in] spi Pointer to the HAL SPI instance.
+ * \param[in] dord The data order: send LSB/MSB first.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_BUSY Busy
+ * \retval ERR_INVALID_ARG The data order is not supported.
+ */
+int32_t spi_m_sync_set_data_order(struct spi_m_sync_descriptor *spi, const enum spi_data_order dord);
+
+/** \brief Perform the SPI data transfer (TX and RX) in polling way
+ *
+ * Activate CS, do TX and RX and deactivate CS. It blocks.
+ *
+ * \param[in, out] spi Pointer to the HAL SPI instance.
+ * \param[in] xfer Pointer to the transfer information (\ref spi_xfer).
+ *
+ * \retval size Success.
+ * \retval >=0 Timeout, with number of characters transferred.
+ * \retval ERR_BUSY SPI is busy
+ */
+int32_t spi_m_sync_transfer(struct spi_m_sync_descriptor *spi, const struct spi_xfer *xfer);
+
+/**
+ * \brief Return the I/O descriptor for this SPI instance
+ *
+ * This function will return an I/O instance for this SPI driver instance.
+ *
+ * \param[in] spi An SPI master descriptor, which is used to communicate through
+ * SPI
+ * \param[in, out] io A pointer to an I/O descriptor pointer type
+ *
+ * \retval ERR_NONE
+ */
+int32_t spi_m_sync_get_io_descriptor(struct spi_m_sync_descriptor *const spi, struct io_descriptor **io);
+
+/** \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t spi_m_sync_get_version(void);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _HAL_SPI_M_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_timer.h b/atmel-samd/asf4/samd21/hal/include/hal_timer.h
new file mode 100644
index 000000000..b5c8f6082
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_timer.h
@@ -0,0 +1,216 @@
+/**
+ * \file
+ *
+ * \brief Timer task functionality declaration.
+ *
+ * Copyright (C) 2014 - 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_TIMER_H_INCLUDED
+#define _HAL_TIMER_H_INCLUDED
+
+#include <utils_list.h>
+#include <hpl_timer.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_timer
+ *
+ * @{
+ */
+
+/**
+ * \brief Timer mode type
+ */
+enum timer_task_mode { TIMER_TASK_ONE_SHOT, TIMER_TASK_REPEAT };
+
+/**
+ * \brief Timer task descriptor
+ *
+ * The timer task descriptor forward declaration.
+ */
+struct timer_task;
+
+/**
+ * \brief Timer task callback function type
+ */
+typedef void (*timer_cb_t)(const struct timer_task *const timer_task);
+
+/**
+ * \brief Timer task structure
+ */
+struct timer_task {
+ struct list_element elem; /*! List element. */
+ uint32_t time_label; /*! Absolute timer start time. */
+
+ uint32_t interval; /*! Number of timer ticks before calling the task. */
+ timer_cb_t cb; /*! Function pointer to the task. */
+ enum timer_task_mode mode; /*! Task mode: one shot or repeat. */
+};
+
+/**
+ * \brief Timer structure
+ */
+struct timer_descriptor {
+ struct _timer_device device;
+ uint32_t time;
+ struct list_descriptor tasks; /*! Timer tasks list. */
+ volatile uint8_t flags;
+};
+
+/**
+ * \brief Initialize timer
+ *
+ * This function initializes the given timer.
+ * It checks if the given hardware is not initialized and if the given hardware
+ * is permitted to be initialized.
+ *
+ * \param[out] descr A timer descriptor to initialize
+ * \param[in] hw The pointer to the hardware instance
+ * \param[in] func The pointer to a set of function pointers
+ *
+ * \return Initialization status.
+ */
+int32_t timer_init(struct timer_descriptor *const descr, void *const hw, struct _timer_hpl_interface *const func);
+
+/**
+ * \brief Deinitialize timer
+ *
+ * This function deinitializes the given timer.
+ * It checks if the given hardware is initialized and if the given hardware is
+ * permitted to be deinitialized.
+ *
+ * \param[in] descr A timer descriptor to deinitialize
+ *
+ * \return De-initialization status.
+ */
+int32_t timer_deinit(struct timer_descriptor *const descr);
+
+/**
+ * \brief Start timer
+ *
+ * This function starts the given timer.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to start
+ *
+ * \return Timer starting status.
+ */
+int32_t timer_start(struct timer_descriptor *const descr);
+
+/**
+ * \brief Stop timer
+ *
+ * This function stops the given timer.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to stop
+ *
+ * \return Timer stopping status.
+ */
+int32_t timer_stop(struct timer_descriptor *const descr);
+
+/**
+ * \brief Set amount of clock cycles per timer tick
+ *
+ * This function sets the amount of clock cycles per timer tick for the given timer.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to stop
+ * \param[in] clock_cycles The amount of clock cycles per tick to set
+ *
+ * \return Setting clock cycles amount status.
+ */
+int32_t timer_set_clock_cycles_per_tick(struct timer_descriptor *const descr, const uint32_t clock_cycles);
+
+/**
+ * \brief Retrieve the amount of clock cycles in a tick
+ *
+ * This function retrieves how many clock cycles there are in a single timer tick.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to convert ticks to
+ * clock cycles
+ * \param[out] cycles The amount of clock cycles
+ *
+ * \return The status of clock cycles retrieving.
+ */
+int32_t timer_get_clock_cycles_in_tick(const struct timer_descriptor *const descr, uint32_t *const cycles);
+
+/**
+ * \brief Add timer task
+ *
+ * This function adds the given timer task to the given timer.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to add task to
+ * \param[in] task A task to add
+ *
+ * \return Timer's task adding status.
+ */
+int32_t timer_add_task(struct timer_descriptor *const descr, struct timer_task *const task);
+
+/**
+ * \brief Remove timer task
+ *
+ * This function removes the given timer task from the given timer.
+ * It checks if the given hardware is initialized.
+ *
+ * \param[in] descr The timer descriptor of a timer to remove task from
+ * \param[in] task A task to remove
+ *
+ * \return Timer's task removing status.
+ */
+int32_t timer_remove_task(struct timer_descriptor *const descr, const struct timer_task *const task);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t timer_get_version(void);
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HAL_TIMER_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_usart_sync.h b/atmel-samd/asf4/samd21/hal/include/hal_usart_sync.h
new file mode 100644
index 000000000..e2aef748d
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_usart_sync.h
@@ -0,0 +1,257 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_SYNC_USART_H_INCLUDED
+#define _HAL_SYNC_USART_H_INCLUDED
+
+#include "hal_io.h"
+#include <hpl_usart_sync.h>
+
+/**
+ * \addtogroup doc_driver_hal_usart_sync
+ *
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Synchronous USART descriptor
+ */
+struct usart_sync_descriptor {
+ struct io_descriptor io;
+ struct _usart_sync_device device;
+};
+
+/**
+ * \brief Initialize USART interface
+ *
+ * This function initializes the given I/O descriptor to be used
+ * as USART interface descriptor.
+ * It checks if the given hardware is not initialized and
+ * if the given hardware is permitted to be initialized.
+ *
+ * \param[out] descr A USART descriptor which is used to communicate via USART
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] func The pointer to as set of functions pointers
+ *
+ * \return Initialization status.
+ */
+int32_t usart_sync_init(struct usart_sync_descriptor *const descr, void *const hw, void *const func);
+
+/**
+ * \brief Deinitialize USART interface
+ *
+ * This function deinitializes the given I/O descriptor.
+ * It checks if the given hardware is initialized and
+ * if the given hardware is permitted to be deinitialized.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return De-initialization status.
+ */
+int32_t usart_sync_deinit(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Enable USART interface
+ *
+ * Enables the USART interface
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return Enabling status.
+ */
+int32_t usart_sync_enable(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Disable USART interface
+ *
+ * Disables the USART interface
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return Disabling status.
+ */
+int32_t usart_sync_disable(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Retrieve I/O descriptor
+ *
+ * This function retrieves the I/O descriptor of the given USART descriptor.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[out] io An I/O descriptor to retrieve
+ *
+ * \return The status of the I/O descriptor retrieving.
+ */
+int32_t usart_sync_get_io_descriptor(struct usart_sync_descriptor *const descr, struct io_descriptor **io);
+
+/**
+ * \brief Specify action for flow control pins
+ *
+ * This function sets the action (or state) for the flow control pins
+ * if the flow control is enabled.
+ * It sets the state of flow control pins only if the automatic support of
+ * the flow control is not supported by the hardware.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] state A state to set the flow control pins
+ *
+ * \return The status of flow control action setup.
+ */
+int32_t usart_sync_set_flow_control(struct usart_sync_descriptor *const descr,
+ const union usart_flow_control_state state);
+
+/**
+ * \brief Set USART baud rate
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] baud_rate A baud rate to set
+ *
+ * \return The status of baud rate setting.
+ */
+int32_t usart_sync_set_baud_rate(struct usart_sync_descriptor *const descr, const uint32_t baud_rate);
+
+/**
+ * \brief Set USART data order
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] data_order A data order to set
+ *
+ * \return The status of data order setting.
+ */
+int32_t usart_sync_set_data_order(struct usart_sync_descriptor *const descr, const enum usart_data_order data_order);
+
+/**
+ * \brief Set USART mode
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] mode A mode to set
+ *
+ * \return The status of mode setting.
+ */
+int32_t usart_sync_set_mode(struct usart_sync_descriptor *const descr, const enum usart_mode mode);
+
+/**
+ * \brief Set USART parity
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] parity A parity to set
+ *
+ * \return The status of parity setting.
+ */
+int32_t usart_sync_set_parity(struct usart_sync_descriptor *const descr, const enum usart_parity parity);
+
+/**
+ * \brief Set USART stop bits
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] stop_bits Stop bits to set
+ *
+ * \return The status of stop bits setting.
+ */
+int32_t usart_sync_set_stopbits(struct usart_sync_descriptor *const descr, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set USART character size
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] size A character size to set
+ *
+ * \return The status of character size setting.
+ */
+int32_t usart_sync_set_character_size(struct usart_sync_descriptor *const descr, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins
+ * if the flow control is enabled.
+ * Function can return USART_FLOW_CONTROL_STATE_UNAVAILABLE in case
+ * if the flow control is done by the hardware
+ * and the pins state cannot be read out.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[out] state The state of flow control pins
+ *
+ * \return The status of flow control state reading.
+ */
+int32_t usart_sync_flow_control_status(const struct usart_sync_descriptor *const descr,
+ union usart_flow_control_state *const state);
+
+/**
+ * \brief Check if the USART transmitter is empty
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return The status of USART TX empty checking.
+ * \retval 0 The USART transmitter is not empty
+ * \retval 1 The USART transmitter is empty
+ */
+int32_t usart_sync_is_tx_empty(const struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Check if the USART receiver is not empty
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return The status of USART RX empty checking.
+ * \retval 1 The USART receiver is not empty
+ * \retval 0 The USART receiver is empty
+ */
+int32_t usart_sync_is_rx_not_empty(const struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t usart_sync_get_version(void);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HAL_SYNC_USART_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hal_usb_device.h b/atmel-samd/asf4/samd21/hal/include/hal_usb_device.h
new file mode 100644
index 000000000..8b7bd5ec7
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hal_usb_device.h
@@ -0,0 +1,305 @@
+/**
+ * \file
+ *
+ * \brief SAM USB device HAL
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_USB_DEVICE_H_INCLUDED
+#define _HAL_USB_DEVICE_H_INCLUDED
+
+#include <hpl_usb_device.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \addtogroup doc_driver_hal_usb_device
+ *
+ * @{
+ */
+
+/** USB device endpoint status structure. */
+struct usb_d_ep_status {
+ /** Endpoint address, including direction. */
+ uint8_t ep;
+ /** Endpoint transfer status code that triggers the callback.
+ * \ref usb_xfer_code. */
+ uint8_t code;
+ /** Endpoint error, if \c code is \ref USB_TRANS_ERROR. */
+ uint8_t error;
+ /** Transfer state, \ref usb_ep_state. */
+ uint8_t state;
+ /** Transfer count. */
+ uint32_t count;
+ /** Transfer size. */
+ uint32_t size;
+};
+
+/** Prototype function for callback that is invoked on USB device SOF. */
+typedef void (*usb_d_sof_cb_t)(void);
+
+/** Prototype function for callback that is invoked on USB device events. */
+typedef void (*usb_d_event_cb_t)(const enum usb_event event, const uint32_t param);
+
+/** USB device callbacks. */
+struct usb_d_callbacks {
+ /** Callback that is invoked on SOF. */
+ usb_d_sof_cb_t sof;
+ /** Callback that is invoked on USB RESET/WAKEUP/RESUME/SUSPEND. */
+ usb_d_event_cb_t event;
+};
+
+/** Callback that is invoked when setup packet is received.
+ * Return \c true if request has been handled, or control endpoint will
+ * stall IN/OUT transactions.
+ */
+typedef bool (*usb_d_ep_cb_setup_t)(const uint8_t ep, const uint8_t *req);
+
+/** Callback that is invoked when buffer is done without error, but last packet
+ * is full size packet without ZLP.
+ * Return \c true if more data has been requested.
+ */
+typedef bool (*usb_d_ep_cb_more_t)(const uint8_t ep, const uint32_t count);
+
+/** Callback that is invoked when all data is finished, including background
+ * transfer, or error happens.
+ * In control transfer data stage, return value is checked,
+ * return \c false if no error happens.
+ */
+typedef bool (*usb_d_ep_cb_xfer_t)(const uint8_t ep, const enum usb_xfer_code code, void *param);
+
+/**
+ * \brief Initialize the USB device driver
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_init(void);
+
+/**
+ * \brief Deinitialize the USB device driver
+ */
+void usb_d_deinit(void);
+
+/**
+ * \brief Register the USB device callback
+ * \param[in] type The callback type to register.
+ * \param[in] func The callback function, NULL to disable callback.
+ */
+void usb_d_register_callback(const enum usb_d_cb_type type, const FUNC_PTR func);
+
+/**
+ * \brief Enable the USB device driver
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_enable(void);
+
+/**
+ * \brief Disable the USB device driver
+ */
+void usb_d_disable(void);
+
+/**
+ * \brief Attach the USB device
+ */
+void usb_d_attach(void);
+
+/**
+ * \brief Detach the USB device
+ */
+void usb_d_detach(void);
+
+/**
+ * \brief Retrieve current USB working speed.
+ * \return USB Speed. See \ref usb_speed.
+ */
+enum usb_speed usb_d_get_speed(void);
+
+/**
+ * \brief Retrieve current USB frame number.
+ * \return Frame number.
+ */
+uint16_t usb_d_get_frame_num(void);
+
+/**
+ * \brief Retrieve current USB micro frame number.
+ * \return Micro frame number inside a frame (0~7).
+ * 0 if not available (not HS).
+ */
+uint8_t usb_d_get_uframe_num(void);
+
+/**
+ * \brief Set the USB address that is used.
+ * \param[in] addr The address to set.
+ */
+void usb_d_set_address(const uint8_t addr);
+
+/**
+ * \brief Send remote wakeup to host
+ * \return Operation status.
+ */
+void usb_d_send_remotewakeup(void);
+
+/**
+ * \brief Initialize the endpoint 0.
+ *
+ * Note that endpoint 0 must be initialized as control endpoint.
+ *
+ * \param[in] max_pkt_size Max. packet size of EP0.
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_ep0_init(const uint8_t max_pkt_size);
+
+/**
+ * \brief Initialize the endpoint.
+ *
+ * \param[in] ep The endpoint address.
+ * \param[in] attr The endpoint attributes.
+ * \param[in] max_pkt_size Max. packet size of EP0.
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_ep_init(const uint8_t ep, const uint8_t attr, const uint16_t max_pkt_size);
+
+/**
+ * \brief Disable and deinitialize the endpoint.
+ * \param[in] ep The endpoint address to deinitialize.
+ */
+void usb_d_ep_deinit(const uint8_t ep);
+
+/**
+ * \brief Register the USB device endpoint callback on initialized endpoint.
+ *
+ * \param[in] ep The endpoint address.
+ * \param[in] type The callback type to register.
+ * \param[in] func The callback function, NULL to disable callback.
+ */
+void usb_d_ep_register_callback(const uint8_t ep, const enum usb_d_ep_cb_type type, const FUNC_PTR func);
+
+/**
+ * \brief Enabled the initialized endpoint.
+ *
+ * Setup request will be monitored after enabling a control endpoint.
+ *
+ * \param[in] ep The endpoint address.
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_ep_enable(const uint8_t ep);
+
+/**
+ * \brief Disable the initialized endpoint.
+ * \param[in] ep The endpoint address.
+ */
+void usb_d_ep_disable(const uint8_t ep);
+
+/**
+ * \brief Get request data pointer to access received setup request packet
+ * \param[in] ep The endpoint address.
+ * \return Pointer to the request data.
+ * \retval NULL The endpoint is not a control endpoint.
+ */
+uint8_t *usb_d_ep_get_req(const uint8_t ep);
+
+/**
+ * \brief Endpoint transfer.
+ *
+ * For control endpoints, start the transfer according to the direction in the bmRequest
+ * type, and finish with STATUS stage.
+ * For non-control endpoints, the transfer will be unique direction. Defined by
+ * bit 8 of the endpoint address.
+ *
+ * \param[in] xfer Pointer to the transfer description.
+ * \return Operation status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_ep_transfer(const struct usb_d_transfer *xfer);
+
+/**
+ * \brief Abort an on-going transfer on a specific endpoint.
+ *
+ * \param[in] ep The endpoint address.
+ */
+void usb_d_ep_abort(const uint8_t ep);
+
+/**
+ * \brief Retrieve the endpoint status.
+ *
+ * \param[in] ep The endpoint address.
+ * \param[out] stat Pointer to the buffer to fill the status description.
+ *
+ * \return Endpoint status.
+ * \retval 1 Busy.
+ * \retval 0 Idle.
+ * \retval <0 Error code.
+ */
+int32_t usb_d_ep_get_status(const uint8_t ep, struct usb_d_ep_status *stat);
+
+/**
+ * \brief Endpoint halt control.
+ *
+ * \param[in] ep The endpoint address.
+ * \param[in] ctrl Control code (SET/CLEAR/GET).
+ *
+ * \return Operation status or HALT state (if \c ctrl is \ref USB_EP_HALT_GET).
+ */
+int32_t usb_d_ep_halt(const uint8_t ep, const enum usb_ep_halt_ctrl ctrl);
+
+/** \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t usb_d_get_version(void);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HAL_USB_DEVICE_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_adc_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_adc_async.h
new file mode 100644
index 000000000..31612be00
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_adc_async.h
@@ -0,0 +1,274 @@
+/**
+ * \file
+ *
+ * \brief ADC related functionality declaration.
+ *
+ * Copyright (C) 2015-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_ADC_ASYNC_H_INCLUDED
+#define _HPL_ADC_ASYNC_H_INCLUDED
+
+/**
+ * \addtogroup HPL ADC
+ *
+ * \section hpl_async_adc_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include "hpl_adc_sync.h"
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief ADC device structure
+ *
+ * The ADC device structure forward declaration.
+ */
+struct _adc_async_device;
+
+/**
+ * \brief ADC callback types
+ */
+enum _adc_async_callback_type { ADC_ASYNC_DEVICE_CONVERT_CB, ADC_ASYNC_DEVICE_MONITOR_CB, ADC_ASYNC_DEVICE_ERROR_CB };
+
+/**
+ * \brief ADC interrupt callbacks
+ */
+struct _adc_async_callbacks {
+ void (*window_cb)(struct _adc_async_device *device, const uint8_t channel);
+ void (*error_cb)(struct _adc_async_device *device, const uint8_t channel);
+};
+
+/**
+ * \brief ADC channel interrupt callbacks
+ */
+struct _adc_async_ch_callbacks {
+ void (*convert_done)(struct _adc_async_device *device, const uint8_t channel, const uint16_t data);
+};
+
+/**
+ * \brief ADC descriptor device structure
+ */
+struct _adc_async_device {
+ struct _adc_async_callbacks adc_async_cb;
+ struct _adc_async_ch_callbacks adc_async_ch_cb;
+ struct _irq_descriptor irq;
+ void * hw;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize synchronous ADC
+ *
+ * This function does low level ADC configuration.
+ *
+ * param[in] device The pointer to ADC device instance
+ * param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _adc_async_init(struct _adc_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize ADC
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_async_deinit(struct _adc_async_device *const device);
+
+/**
+ * \brief Enable ADC peripheral
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_async_enable_channel(struct _adc_async_device *const device, const uint8_t channel);
+
+/**
+ * \brief Disable ADC peripheral
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_async_disable_channel(struct _adc_async_device *const device, const uint8_t channel);
+
+/**
+ * \brief Retrieve ADC conversion data size
+ *
+ * \param[in] device The pointer to ADC device instance
+ *
+ * \return The data size in bytes
+ */
+uint8_t _adc_async_get_data_size(const struct _adc_async_device *const device);
+
+/**
+ * \brief Check if conversion is done
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ *
+ * \return The status of conversion
+ * \retval true The conversion is done
+ * \retval false The conversion is not done
+ */
+bool _adc_async_is_channel_conversion_done(const struct _adc_async_device *const device, const uint8_t channel);
+
+/**
+ * \brief Make conversion
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_async_convert(struct _adc_async_device *const device);
+
+/**
+ * \brief Retrieve the conversion result
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ *
+ * The result value
+ */
+uint16_t _adc_async_read_channel_data(const struct _adc_async_device *const device, const uint8_t channel);
+
+/**
+ * \brief Set reference source
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] reference A reference source to set
+ */
+void _adc_async_set_reference_source(struct _adc_async_device *const device, const adc_reference_t reference);
+
+/**
+ * \brief Set resolution
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] resolution A resolution to set
+ */
+void _adc_async_set_resolution(struct _adc_async_device *const device, const adc_resolution_t resolution);
+
+/**
+ * \brief Set ADC input source of a channel
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] pos_input A positive input source to set
+ * \param[in] neg_input A negative input source to set
+ * \param[in] channel Channel number
+ */
+void _adc_async_set_inputs(struct _adc_async_device *const device, const adc_pos_input_t pos_input,
+ const adc_neg_input_t neg_input, const uint8_t channel);
+
+/**
+ * \brief Set conversion mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A conversion mode to set
+ */
+void _adc_async_set_conversion_mode(struct _adc_async_device *const device, const enum adc_conversion_mode mode);
+
+/**
+ * \brief Set differential mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] mode A differential mode to set
+ */
+void _adc_async_set_channel_differential_mode(struct _adc_async_device *const device, const uint8_t channel,
+ const enum adc_differential_mode mode);
+
+/**
+ * \brief Set gain
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] gain A gain to set
+ */
+void _adc_async_set_channel_gain(struct _adc_async_device *const device, const uint8_t channel, const adc_gain_t gain);
+
+/**
+ * \brief Set window mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A mode to set
+ */
+void _adc_async_set_window_mode(struct _adc_async_device *const device, const adc_window_mode_t mode);
+
+/**
+ * \brief Set lower threshold
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] low_threshold A lower threshold to set
+ * \param[in] up_threshold An upper thresholds to set
+ */
+void _adc_async_set_thresholds(struct _adc_async_device *const device, const adc_threshold_t low_threshold,
+ const adc_threshold_t up_threshold);
+
+/**
+ * \brief Retrieve threshold state
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[out] state The threshold state
+ */
+void _adc_async_get_threshold_state(const struct _adc_async_device *const device, adc_threshold_status_t *const state);
+
+/**
+ * \brief Enable/disable ADC channel interrupt
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] type The type of interrupt to disable/enable if applicable
+ * \param[in] state Enable or disable
+ */
+void _adc_async_set_irq_state(struct _adc_async_device *const device, const uint8_t channel,
+ const enum _adc_async_callback_type type, const bool state);
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_ADC_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_adc_dma.h b/atmel-samd/asf4/samd21/hal/include/hpl_adc_dma.h
new file mode 100644
index 000000000..40ff158d2
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_adc_dma.h
@@ -0,0 +1,253 @@
+/**
+ * \file
+ *
+ * \brief ADC related functionality declaration.
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_ADC_DMA_H_INCLUDED
+#define _HPL_ADC_DMA_H_INCLUDED
+
+/**
+ * \addtogroup HPL ADC
+ *
+ * \section hpl_dma_adc_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <hpl_adc_sync.h>
+#include <hpl_irq.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief ADC device structure
+ *
+ * The ADC device structure forward declaration.
+ */
+struct _adc_dma_device;
+
+/**
+ * \brief ADC callback types
+ */
+enum _adc_dma_callback_type { ADC_DMA_DEVICE_COMPLETE_CB, ADC_DMA_DEVICE_ERROR_CB };
+
+/**
+ * \brief ADC interrupt callbacks
+ */
+struct _adc_dma_callbacks {
+ void (*complete)(struct _adc_dma_device *device, const uint16_t data);
+ void (*error)(struct _adc_dma_device *device);
+};
+
+/**
+ * \brief ADC descriptor device structure
+ */
+struct _adc_dma_device {
+ struct _adc_dma_callbacks adc_dma_cb;
+ struct _irq_descriptor irq;
+ void * hw;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize synchronous ADC
+ *
+ * This function does low level ADC configuration.
+ *
+ * param[in] device The pointer to ADC device instance
+ * param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _adc_dma_init(struct _adc_dma_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize ADC
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_dma_deinit(struct _adc_dma_device *const device);
+
+/**
+ * \brief Enable ADC peripheral
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_dma_enable_channel(struct _adc_dma_device *const device, const uint8_t channel);
+
+/**
+ * \brief Disable ADC peripheral
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_dma_disable_channel(struct _adc_dma_device *const device, const uint8_t channel);
+
+/**
+ * \brief Return address of ADC DMA source
+ *
+ * \param[in] device The pointer to ADC device instance
+ *
+ * \return ADC DMA source address
+ */
+uint32_t _adc_get_source_for_dma(struct _adc_dma_device *const device);
+
+/**
+ * \brief Retrieve ADC conversion data size
+ *
+ * \param[in] device The pointer to ADC device instance
+ *
+ * \return The data size in bytes
+ */
+uint8_t _adc_dma_get_data_size(const struct _adc_dma_device *const device);
+
+/**
+ * \brief Check if conversion is done
+ *
+ * \param[in] device The pointer to ADC device instance
+ *
+ * \return The status of conversion
+ * \retval true The conversion is done
+ * \retval false The conversion is not done
+ */
+bool _adc_dma_is_conversion_done(const struct _adc_dma_device *const device);
+
+/**
+ * \brief Make conversion
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_dma_convert(struct _adc_dma_device *const device);
+
+/**
+ * \brief Set reference source
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] reference A reference source to set
+ */
+void _adc_dma_set_reference_source(struct _adc_dma_device *const device, const adc_reference_t reference);
+
+/**
+ * \brief Set resolution
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] resolution A resolution to set
+ */
+void _adc_dma_set_resolution(struct _adc_dma_device *const device, const adc_resolution_t resolution);
+
+/**
+ * \brief Set ADC input source of a channel
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] pos_input A positive input source to set
+ * \param[in] neg_input A negative input source to set
+ * \param[in] channel Channel number
+ */
+void _adc_dma_set_inputs(struct _adc_dma_device *const device, const adc_pos_input_t pos_input,
+ const adc_neg_input_t neg_input, const uint8_t channel);
+
+/**
+ * \brief Set conversion mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A conversion mode to set
+ */
+void _adc_dma_set_conversion_mode(struct _adc_dma_device *const device, const enum adc_conversion_mode mode);
+
+/**
+ * \brief Set differential mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] mode A differential mode to set
+ */
+void _adc_dma_set_channel_differential_mode(struct _adc_dma_device *const device, const uint8_t channel,
+ const enum adc_differential_mode mode);
+
+/**
+ * \brief Set gain
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] gain A gain to set
+ */
+void _adc_dma_set_channel_gain(struct _adc_dma_device *const device, const uint8_t channel, const adc_gain_t gain);
+
+/**
+ * \brief Set window mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A mode to set
+ */
+void _adc_dma_set_window_mode(struct _adc_dma_device *const device, const adc_window_mode_t mode);
+
+/**
+ * \brief Set thresholds
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] low_threshold A lower thresholds to set
+ * \param[in] up_threshold An upper thresholds to set
+ */
+void _adc_dma_set_thresholds(struct _adc_dma_device *const device, const adc_threshold_t low_threshold,
+ const adc_threshold_t up_threshold);
+
+/**
+ * \brief Retrieve threshold state
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[out] state The threshold state
+ */
+void _adc_dma_get_threshold_state(const struct _adc_dma_device *const device, adc_threshold_status_t *const state);
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_ADC_DMA_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_adc_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_adc_sync.h
new file mode 100644
index 000000000..84ab01ab3
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_adc_sync.h
@@ -0,0 +1,281 @@
+/**
+ * \file
+ *
+ * \brief ADC related functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_ADC_SYNC_H_INCLUDED
+#define _HPL_ADC_SYNC_H_INCLUDED
+
+/**
+ * \addtogroup HPL ADC
+ *
+ * \section hpl_adc_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include "compiler.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief ADC reference source
+ */
+typedef uint8_t adc_reference_t;
+
+/**
+ * \brief ADC resolution
+ */
+typedef uint8_t adc_resolution_t;
+
+/**
+ * \brief ADC positive input for channel
+ */
+typedef uint8_t adc_pos_input_t;
+
+/**
+ * \brief ADC negative input for channel
+ */
+typedef uint8_t adc_neg_input_t;
+
+/**
+ * \brief ADC threshold
+ */
+typedef uint16_t adc_threshold_t;
+
+/**
+ * \brief ADC gain
+ */
+typedef uint8_t adc_gain_t;
+
+/**
+ * \brief ADC conversion mode
+ */
+enum adc_conversion_mode { ADC_CONVERSION_MODE_SINGLE_CONVERSION = 0, ADC_CONVERSION_MODE_FREERUN };
+
+/**
+ * \brief ADC differential mode
+ */
+enum adc_differential_mode { ADC_DIFFERENTIAL_MODE_SINGLE_ENDED = 0, ADC_DIFFERENTIAL_MODE_DIFFERENTIAL };
+
+/**
+ * \brief ADC window mode
+ */
+typedef uint8_t adc_window_mode_t;
+
+/**
+ * \brief ADC threshold status
+ */
+typedef bool adc_threshold_status_t;
+
+/**
+ * \brief ADC sync descriptor device structure
+ */
+struct _adc_sync_device {
+ void *hw;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize synchronous ADC
+ *
+ * This function does low level ADC configuration.
+ *
+ * param[in] device The pointer to ADC device instance
+ * param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _adc_sync_init(struct _adc_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize ADC
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_sync_deinit(struct _adc_sync_device *const device);
+
+/**
+ * \brief Enable ADC
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_sync_enable_channel(struct _adc_sync_device *const device, const uint8_t channel);
+
+/**
+ * \brief Disable ADC
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ */
+void _adc_sync_disable_channel(struct _adc_sync_device *const device, const uint8_t channel);
+
+/**
+ * \brief Retrieve ADC conversion data size
+ *
+ * \param[in] device The pointer to ADC device instance
+ *
+ * \return The data size in bytes
+ */
+uint8_t _adc_sync_get_data_size(const struct _adc_sync_device *const device);
+
+/**
+ * \brief Check if conversion is done
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ *
+ * \return The status of conversion
+ * \retval true The conversion is done
+ * \retval false The conversion is not done
+ */
+bool _adc_sync_is_channel_conversion_done(const struct _adc_sync_device *const device, const uint8_t channel);
+
+/**
+ * \brief Make conversion
+ *
+ * \param[in] device The pointer to ADC device instance
+ */
+void _adc_sync_convert(struct _adc_sync_device *const device);
+
+/**
+ * \brief Retrieve the conversion result
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ *
+ * \return The result value of channel
+ */
+uint16_t _adc_sync_read_channel_data(const struct _adc_sync_device *const device, const uint8_t channel);
+
+/**
+ * \brief Set reference source
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] reference A reference source to set
+ */
+void _adc_sync_set_reference_source(struct _adc_sync_device *const device, const adc_reference_t reference);
+
+/**
+ * \brief Set resolution
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] resolution A resolution to set
+ */
+void _adc_sync_set_resolution(struct _adc_sync_device *const device, const adc_resolution_t resolution);
+
+/**
+ * \brief Set ADC input source of a channel
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] pos_input A positive input source to set
+ * \param[in] neg_input A negative input source to set
+ * \param[in] channel Channel number
+ */
+void _adc_sync_set_inputs(struct _adc_sync_device *const device, const adc_pos_input_t pos_input,
+ const adc_neg_input_t neg_input, const uint8_t channel);
+
+/**
+ * \brief Set conversion mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A conversion mode to set
+ */
+void _adc_sync_set_conversion_mode(struct _adc_sync_device *const device, const enum adc_conversion_mode mode);
+
+/**
+ * \brief Set differential mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] mode A differential mode to set
+ */
+void _adc_sync_set_channel_differential_mode(struct _adc_sync_device *const device, const uint8_t channel,
+ const enum adc_differential_mode mode);
+
+/**
+ * \brief Set gain
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] channel Channel number
+ * \param[in] gain A gain to set
+ */
+void _adc_sync_set_channel_gain(struct _adc_sync_device *const device, const uint8_t channel, const adc_gain_t gain);
+
+/**
+ * \brief Set window mode
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] mode A mode to set
+ */
+void _adc_sync_set_window_mode(struct _adc_sync_device *const device, const adc_window_mode_t mode);
+
+/**
+ * \brief Set threshold
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[in] low_threshold A lower threshold to set
+ * \param[in] up_threshold An upper thresholds to set
+ */
+void _adc_sync_set_thresholds(struct _adc_sync_device *const device, const adc_threshold_t low_threshold,
+ const adc_threshold_t up_threshold);
+
+/**
+ * \brief Retrieve threshold state
+ *
+ * \param[in] device The pointer to ADC device instance
+ * \param[out] state The threshold state
+ */
+void _adc_sync_get_threshold_state(const struct _adc_sync_device *const device, adc_threshold_status_t *const state);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_ADC_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_calendar.h b/atmel-samd/asf4/samd21/hal/include/hpl_calendar.h
new file mode 100644
index 000000000..9b9002c25
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_calendar.h
@@ -0,0 +1,252 @@
+/**
+ * \file
+ *
+ * \brief Generic CALENDAR functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_CALENDER_H_INCLUDED
+#define _HPL_CALENDER_H_INCLUDED
+
+#include <compiler.h>
+#include <utils_list.h>
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Calendar structure
+ *
+ * The Calendar structure forward declaration.
+ */
+struct calendar_dev;
+
+/**
+ * \brief Available mask options for alarms.
+ *
+ * Available mask options for alarms.
+ */
+enum calendar_alarm_option {
+ /** Alarm disabled. */
+ CALENDAR_ALARM_MATCH_DISABLED = 0,
+ /** Alarm match on second. */
+ CALENDAR_ALARM_MATCH_SEC,
+ /** Alarm match on second and minute. */
+ CALENDAR_ALARM_MATCH_MIN,
+ /** Alarm match on second, minute, and hour. */
+ CALENDAR_ALARM_MATCH_HOUR,
+ /** Alarm match on second, minute, hour, and day. */
+ CALENDAR_ALARM_MATCH_DAY,
+ /** Alarm match on second, minute, hour, day, and month. */
+ CALENDAR_ALARM_MATCH_MONTH,
+ /** Alarm match on second, minute, hour, day, month and year. */
+ CALENDAR_ALARM_MATCH_YEAR
+};
+
+/**
+ * \brief Available mode for alarms.
+ */
+enum calendar_alarm_mode { ONESHOT = 1, REPEAT };
+/**
+ * \brief Prototype of callback on alarm match
+ */
+typedef void (*calendar_drv_cb_alarm_t)(struct calendar_dev *const dev);
+
+/**
+ * \brief Structure of Calendar instance
+ */
+struct calendar_dev {
+ /** Pointer to the hardware base */
+ void *hw;
+ /** Alarm match callback */
+ calendar_drv_cb_alarm_t callback;
+ /** IRQ struct */
+ struct _irq_descriptor irq;
+};
+
+/**
+ * \brief Time struct for calendar
+ */
+struct calendar_time {
+ /*range from 0 to 59*/
+ uint8_t sec;
+ /*range from 0 to 59*/
+ uint8_t min;
+ /*range from 0 to 23*/
+ uint8_t hour;
+};
+
+/**
+ * \brief Time struct for calendar
+ */
+struct calendar_date {
+ /*range from 1 to 28/29/30/31*/
+ uint8_t day;
+ /*range from 1 to 12*/
+ uint8_t month;
+ /*absolute year>= 1970(such as 2000)*/
+ uint16_t year;
+};
+
+/** \brief Calendar driver struct
+ *
+ */
+struct calendar_descriptor {
+ struct calendar_dev device;
+ struct list_descriptor alarms;
+ /*base date/time = base_year/1/1/0/0/0(year/month/day/hour/min/sec)*/
+ uint32_t base_year;
+ uint8_t flags;
+};
+
+/** \brief Date&Time struct for calendar
+ */
+struct calendar_date_time {
+ struct calendar_time time;
+ struct calendar_date date;
+};
+
+/** \brief struct for alarm time
+ */
+struct _calendar_alarm {
+ struct calendar_date_time datetime;
+ uint32_t timestamp;
+ enum calendar_alarm_option option;
+ enum calendar_alarm_mode mode;
+};
+
+/**
+ * \brief Initialize Calendar instance
+ *
+ * \param[in] dev The pointer to calendar device struct
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_init(struct calendar_dev *const dev);
+
+/**
+ * \brief Deinitialize Calendar instance
+ *
+ * \param[in] dev The pointer to calendar device struct
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_deinit(struct calendar_dev *const dev);
+
+/**
+ * \brief Enable Calendar instance
+ *
+ * \param[in] dev The pointer to calendar device struct
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_enable(struct calendar_dev *const dev);
+
+/**
+ * \brief Disable Calendar instance
+ *
+ * \param[in] dev The pointer to calendar device struct
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_disable(struct calendar_dev *const dev);
+/**
+ * \brief Set time for calendar
+ *
+ * \param[in] dev The pointer to calendar device struct
+ * \param[in] p_calendar_time Pointer to the time configuration
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_set_time(struct calendar_dev *const dev, struct calendar_time *const p_calendar_time);
+
+/**
+ * \brief Set date for calendar
+ *
+ * \param[in] dev The pointer to calendar device struct
+ * \param[in] p_calendar_date Pointer to the date configuration
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_set_date(struct calendar_dev *const dev, struct calendar_date *const p_calendar_date);
+
+/**
+ * \brief Get the time for calendar HAL instance and hardware
+ * Retrieve the time from calendar instance.
+ *
+ * \param[in] dev The pointer to calendar device struct
+ * \param[in] date_time Pointer to value that will be filled with current time
+ *
+ * \return Return current counter value
+ */
+uint32_t _calendar_get_date_time(struct calendar_dev *const dev, struct calendar_date_time *const date_time);
+
+/**
+ * \brief Set compare value for calendar
+ *
+ * \param[in] dev The pointer to calendar device struct
+ * \param[in] alarm Pointer to the configuration
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_set_alarm(struct calendar_dev *const dev, struct _calendar_alarm *const alarm);
+
+/**
+ * \brief Register callback for calendar alarm
+ *
+ * \param[in] dev The pointer to calendar device struct
+ * \param[in] callback The pointer to callback function
+ *
+ * \return ERR_NONE on success, or an error code on failure.
+ */
+int32_t _calendar_register_callback(struct calendar_dev *const dev, calendar_drv_cb_alarm_t callback);
+
+/**
+ * \brief Set calendar IRQ
+ *
+ * \param[in] dev The pointer to calendar device struct
+ */
+void _calendar_set_irq(struct calendar_dev *const dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_RTC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_core.h b/atmel-samd/asf4/samd21/hal/include/hpl_core.h
new file mode 100644
index 000000000..db448a16a
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_core.h
@@ -0,0 +1,66 @@
+/**
+ * \file
+ *
+ * \brief CPU core related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_CORE_H_INCLUDED
+#define _HPL_CORE_H_INCLUDED
+
+/**
+ * \addtogroup HPL Core
+ *
+ * \section hpl_core_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include "hpl_core_port.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_CORE_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_dac_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_dac_async.h
new file mode 100644
index 000000000..fe55e6015
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_dac_async.h
@@ -0,0 +1,182 @@
+/**
+ * \file
+ *
+ * \brief DAC related functionality declaration.
+ *
+ * Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_DAC_H_INCLUDED
+#define _HPL_DAC_H_INCLUDED
+
+/**
+ * \addtogroup hpl__dac__group DAC HPL APIs
+ * See interface description here: \ref hpl__dac__doc
+ *
+ */
+
+/**@{*/
+
+#include <compiler.h>
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * DAC hardware Channel Number
+ */
+
+#ifndef CHANNEL_NUM
+#define CHANNEL_NUM 1
+#endif
+
+/**
+ * \brief DAC callback types
+ */
+enum _dac_callback_type { DAC_DEVICE_CONVERSION_DONE_CB, DAC_DEVICE_ERROR_CB };
+
+/**
+ * \brief DAC device structure
+ *
+ * The DAC device structure forward declaration.
+ */
+struct _dac_async_device;
+
+/**
+ * \brief DAC interrupt handlers structure
+ */
+struct _dac_callback {
+ /** Transmit ready(Data Buffer empty) handler */
+ void (*tx_ready_cb)(struct _dac_async_device *device, const uint8_t ch);
+ /** Error handler */
+ void (*tx_error_cb)(struct _dac_async_device *device, const uint8_t ch);
+};
+
+/**
+ * \brief DAC descriptor device structure.
+ */
+struct _dac_async_device {
+ struct _dac_callback dac_cb; /*!< Interrupt handers */
+ struct _irq_descriptor irq; /*!< Interrupt descriptor */
+ void * hw; /*!< Hardware module instance handler */
+};
+
+/**
+ * \brief Initialize asynchronous DAC.
+ *
+ * This function does low level DAC configuration.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _dac_async_init(struct _dac_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize DAC.
+ *
+ * \param[in] device The pointer to DAC device instance
+ */
+void _dac_async_deinit(struct _dac_async_device *const device);
+
+/**
+ * \brief Enable DAC Channel.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ */
+void _dac_async_enable_channel(struct _dac_async_device *const device, const uint8_t ch);
+
+/**
+ * \brief Disable DAC Channel.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ */
+void _dac_async_disable_channel(struct _dac_async_device *const device, const uint8_t ch);
+
+/**
+ * \brief Checks if DAC channel is enabled
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ *
+ * \return true channel is enabled, false otherwise
+ */
+bool _dac_async_is_channel_enable(struct _dac_async_device *const device, const uint8_t ch);
+
+/**
+ * \brief Write DAC data for output.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] data Digital data which to be converted
+ * \param[in] ch The channel selected to output
+ */
+void _dac_async_write_data(struct _dac_async_device *const device, const uint16_t data, const uint8_t ch);
+
+/**
+ * \brief Enable/disable DAC interrupt
+ *
+ * param[in] device The pointer to DAC device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _dac_async_set_irq_state(struct _dac_async_device *const device, const enum _dac_callback_type type,
+ const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+
+/**
+ * \page hpl__dac__doc DAC HPL Interface Driver
+ *
+ * \section hpl__dac__desc DAC HPL Description
+ *
+ * The following device can use this HPL driver
+ * - Atmel | SMART SAM D21
+ *
+ * \section hpl__dac__imple DAC HPL Implements
+ * - \subpage hpl__dac__hw_module1__doc
+ */
+
+#endif /* _HPL_DAC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_dac_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_dac_sync.h
new file mode 100644
index 000000000..49a7222bf
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_dac_sync.h
@@ -0,0 +1,148 @@
+/**
+ * \file
+ *
+ * \brief DAC related functionality declaration.
+ *
+ * Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_DAC_SYNC_H_INCLUDED
+#define _HPL_DAC_SYNC_H_INCLUDED
+
+/**
+ * \addtogroup hpl__dac__group DAC HPL APIs
+ * See interface description here: \ref hpl__dac__doc
+ *
+ */
+
+/**@{*/
+
+#include <compiler.h>
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * DAC hardware Channel Number
+ */
+
+#ifndef CHANNEL_NUM
+#define CHANNEL_NUM 1
+#endif
+
+/**
+ * \brief DAC sync descriptor device structure.
+ */
+struct _dac_sync_device {
+ void *hw; /*!< Hardware module instance handler */
+};
+
+/**
+ * \brief Initialize synchronous DAC.
+ *
+ * This function does low level DAC configuration.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _dac_sync_init(struct _dac_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize DAC.
+ *
+ * \param[in] device The pointer to DAC device instance
+ */
+void _dac_sync_deinit(struct _dac_sync_device *const device);
+
+/**
+ * \brief Enable DAC Channel.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ */
+void _dac_sync_enable_channel(struct _dac_sync_device *const device, const uint8_t ch);
+
+/**
+ * \brief Disable DAC Channel.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ */
+void _dac_sync_disable_channel(struct _dac_sync_device *const device, const uint8_t ch);
+
+/**
+ * \brief Checks if DAC channel is enabled
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] ch channel number
+ *
+ * \return true channel is enabled, false otherwise
+ */
+bool _dac_sync_is_channel_enable(struct _dac_sync_device *const device, const uint8_t ch);
+
+/**
+ * \brief Write synchronous DAC data for output.
+ *
+ * \param[in] device The pointer to DAC device instance
+ * \param[in] data Digital data which to be converted
+ * \param[in] ch The channel selected to output
+ */
+void _dac_sync_write_data(struct _dac_sync_device *const device, const uint16_t data, const uint8_t ch);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+
+/**
+ * \page hpl__dac__doc DAC HPL Interface Driver
+ *
+ * \section hpl__dac__desc DAC HPL Description
+ *
+ * The following device can use this HPL driver
+ * - Atmel | SMART SAM D21
+ *
+ * \section hpl__dac__imple DAC HPL Implements
+ * - \subpage hpl__dac__hw_module1__doc
+ */
+
+#endif /* _HPL_DAC_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_delay.h b/atmel-samd/asf4/samd21/hal/include/hpl_delay.h
new file mode 100644
index 000000000..7d2a6f90b
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_delay.h
@@ -0,0 +1,88 @@
+/**
+ * \file
+ *
+ * \brief Delay related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_DELAY_H_INCLUDED
+#define _HPL_DELAY_H_INCLUDED
+
+/**
+ * \addtogroup HPL Delay
+ *
+ * \section hpl_delay_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#ifndef _UNIT_TEST_
+#include <compiler.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name HPL functions
+ */
+//@{
+
+/**
+ * \brief Initialize delay functionality
+ *
+ * \param[in] hw The pointer to hardware instance
+ */
+void _delay_init(void *const hw);
+
+/**
+ * \brief Retrieve the amount of cycles to delay for the given amount of us
+ *
+ * \param[in] us The amount of us to delay for
+ *
+ * \return The amount of cycles
+ */
+uint32_t _get_cycles_for_us(const uint16_t us);
+
+/**
+ * \brief Retrieve the amount of cycles to delay for the given amount of ms
+ *
+ * \param[in] ms The amount of ms to delay for
+ *
+ * \return The amount of cycles
+ */
+uint32_t _get_cycles_for_ms(const uint16_t ms);
+
+/**
+ * \brief Delay loop to delay n number of cycles
+ *
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] cycles The amount of cycles to delay for
+ */
+void _delay_cycles(void *const hw, uint32_t cycles);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_DELAY_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_dma.h b/atmel-samd/asf4/samd21/hal/include/hpl_dma.h
new file mode 100644
index 000000000..f8c8cce42
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_dma.h
@@ -0,0 +1,167 @@
+/**
+ * \file
+ *
+ * \brief DMA related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_DMA_H_INCLUDED
+#define _HPL_DMA_H_INCLUDED
+
+/**
+ * \addtogroup HPL DMA
+ *
+ * \section hpl_dma_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+#include <hpl_irq.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct _dma_resource;
+
+/**
+ * \brief DMA callback types
+ */
+enum _dma_callback_type { DMA_TRANSFER_COMPLETE_CB, DMA_TRANSFER_ERROR_CB };
+
+/**
+ * \brief DMA interrupt callbacks
+ */
+struct _dma_callbacks {
+ void (*transfer_done)(struct _dma_resource *resource);
+ void (*error)(struct _dma_resource *resource);
+};
+
+/**
+ * \brief DMA resource structure
+ */
+struct _dma_resource {
+ struct _dma_callbacks dma_cb;
+ void * back;
+};
+
+/**
+ * \brief Initialize DMA
+ *
+ * This function does low level DMA configuration.
+ *
+ * \return initialize status
+ */
+int32_t _dma_init(void);
+
+/**
+ * \brief Set destination address
+ *
+ * \param[in] channel DMA channel to set destination address for
+ * \param[in] dst Destination address
+ *
+ * \return setting status
+ */
+int32_t _dma_set_destination_address(const uint8_t channel, const void *const dst);
+
+/**
+ * \brief Set source address
+ *
+ * \param[in] channel DMA channel to set source address for
+ * \param[in] src Source address
+ *
+ * \return setting status
+ */
+int32_t _dma_set_source_address(const uint8_t channel, const void *const src);
+
+/**
+ * \brief Enable/disable source address incrementation during DMA transaction
+ *
+ * \param[in] channel DMA channel to set source address for
+ * \param[in] enable True to enable, false to disable
+ *
+ * \return status of operation
+ */
+int32_t _dma_srcinc_enable(const uint8_t channel, const bool enable);
+
+/**
+ * \brief Set the amount of data to be transfered per transaction
+ *
+ * \param[in] channel DMA channel to set data amount for
+ * \param[in] amount Data amount
+ *
+ * \return status of operation
+ */
+int32_t _dma_set_data_amount(const uint8_t channel, const uint32_t amount);
+
+/**
+ * \brief Trigger DMA transaction on the given channel
+ *
+ * \param[in] channel DMA channel to trigger transaction on
+ *
+ * \return status of operation
+ */
+int32_t _dma_enable_transaction(const uint8_t channel, const bool software_trigger);
+
+/**
+ * \brief Retrieves DMA resource structure
+ *
+ * \param[out] resource The resource to be retrieved
+ * \param[in] channel DMA channel to retrieve structure for
+ *
+ * \return status of operation
+ */
+int32_t _dma_get_channel_resource(struct _dma_resource **resource, const uint8_t channel);
+
+/**
+ * \brief Enable/disable DMA interrupt
+ *
+ * \param[in] channel DMA channel to enable/disable interrupt for
+ * \param[in] type The type of interrupt to disable/enable if applicable
+ * \param[in] state Enable or disable
+ */
+void _dma_set_irq_state(const uint8_t channel, const enum _dma_callback_type type, const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HPL_DMA_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_flash.h b/atmel-samd/asf4/samd21/hal/include/hpl_flash.h
new file mode 100644
index 000000000..774bb5e0b
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_flash.h
@@ -0,0 +1,228 @@
+/**
+ * \file
+ *
+ * \brief FLASH related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_FLASH_H_INCLUDED
+#define _HPL_FLASH_H_INCLUDED
+
+/**
+ * \addtogroup hpl__flash__group FLASH HPL APIs
+ *
+ */
+
+/**@{*/
+
+#include <compiler.h>
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief FLASH device structure
+ *
+ * The FLASH device structure forward declaration.
+ */
+struct _flash_device;
+
+/** The callback types */
+enum _flash_cb_type { FLASH_DEVICE_CB_READY, FLASH_DEVICE_CB_ERROR, FLASH_DEVICE_CB_N };
+
+/**
+ * \brief FLASH interrupt handlers structure
+ */
+struct _flash_callback {
+ /** Ready to accept new command handler */
+ void (*ready_cb)(struct _flash_device *device);
+ /** Error handler */
+ void (*error_cb)(struct _flash_device *device);
+};
+
+/**
+ * \brief FLASH descriptor device structure.
+ */
+struct _flash_device {
+ struct _flash_callback flash_cb; /*!< Interrupt handers */
+ struct _irq_descriptor irq; /*!< Interrupt descriptor */
+ void * hw; /*!< Hardware module instance handler */
+};
+
+/**
+ * \brief Initialize FLASH.
+ *
+ * This function does low level FLASH configuration.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialize status.
+ */
+int32_t _flash_init(struct _flash_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize FLASH.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ */
+void _flash_deinit(struct _flash_device *const device);
+
+/**
+ * \brief Reads a number of bytes in the internal Flash.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] src_addr Source bytes address to read from flash
+ * \param[out] buffer Pointer to a buffer where the content
+ * of the read page will be stored
+ * \param[in] length Number of bytes to read
+ */
+void _flash_read(struct _flash_device *const device, const uint32_t src_addr, uint8_t *buffer, uint32_t length);
+
+/**
+ * \brief Writes a number of bytes in the internal Flash.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address to write into flash
+ * \param[in] buffer Pointer to buffer where the data to
+ * write is stored
+ * \param[in] length Number of bytes to write
+ */
+void _flash_write(struct _flash_device *const device, const uint32_t dst_addr, uint8_t *buffer, uint32_t length);
+
+/**
+ * \brief Appends a number of bytes in the internal Flash.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address to write into flash
+ * \param[in] buffer Pointer to buffer with data to write to flash
+ * \param[in] length Number of bytes to write
+ */
+void _flash_append(struct _flash_device *const device, const uint32_t dst_addr, uint8_t *buffer, uint32_t length);
+
+/** \brief Execute lock in the internal flash
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be locked
+ * \param[in] page_nums Number of pages to be locked
+ *
+ * \return Real locked numbers of pages.
+ */
+int32_t _flash_lock(struct _flash_device *const device, const uint32_t dst_addr, uint32_t page_nums);
+
+/** \brief Execute unlock in the internal flash
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be unlocked
+ * \param[in] page_nums Number of pages to be unlocked
+ *
+ * \return Real unlocked numbers of pages.
+ */
+int32_t _flash_unlock(struct _flash_device *const device, const uint32_t dst_addr, uint32_t page_nums);
+
+/** \brief check whether the region which is pointed by address
+ * is locked
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address to check
+ *
+ * \return The lock status of assigned address.
+ */
+bool _flash_is_locked(struct _flash_device *const device, const uint32_t dst_addr);
+
+/** \brief Execute erase in the internal flash
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] dst_addr Destination bytes address aligned with page
+ * start to be erased
+ * \param[in] page_nums Number of pages to be erased
+ */
+void _flash_erase(struct _flash_device *const device, const uint32_t dst_addr, uint32_t page_nums);
+
+/**
+ * \brief Get the flash page size.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ *
+ * \return The flash page size
+ */
+uint32_t _flash_get_page_size(struct _flash_device *const device);
+
+/**
+ * \brief Get the numbers of flash page.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ *
+ * \return The flash total page numbers
+ */
+uint32_t _flash_get_total_pages(struct _flash_device *const device);
+
+/**
+ * \brief Get the number of wait states for read and write operations.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ *
+ * \return The number of wait states for read and write operations
+ */
+uint8_t _flash_get_wait_state(struct _flash_device *const device);
+
+/**
+ * \brief Set the number of wait states for read and write operations.
+ *
+ * \param[in] device The pointer to FLASH device instance
+ * \param[in] state The number of wait states
+ *
+ */
+void _flash_set_wait_state(struct _flash_device *const device, uint8_t state);
+
+/**
+ * \brief Enable/disable Flash interrupt
+ *
+ * param[in] device The pointer to Flash device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _flash_set_irq_state(struct _flash_device *const device, const enum _flash_cb_type type, const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+
+#endif /* _HPL_FLASH_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_gpio.h b/atmel-samd/asf4/samd21/hal/include/hpl_gpio.h
new file mode 100644
index 000000000..e1de9c58e
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_gpio.h
@@ -0,0 +1,195 @@
+/**
+ * \file
+ *
+ * \brief Port related functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_GPIO_H_INCLUDED
+#define _HPL_GPIO_H_INCLUDED
+
+/**
+ * \addtogroup HPL Port
+ *
+ * \section hpl_port_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/**
+ * \brief Macros for the pin and port group, lower 5
+ * bits stands for pin number in the group, higher 3
+ * bits stands for port group
+ */
+#define GPIO_PIN(n) (((n)&0x1Fu) << 0)
+#define GPIO_PORT(n) ((n) >> 5)
+#define GPIO(port, pin) ((((port)&0x7u) << 5) + ((pin)&0x1Fu))
+#define GPIO_PIN_FUNCTION_OFF 0xffffffff
+
+/**
+ * \brief PORT pull mode settings
+ */
+enum gpio_pull_mode { GPIO_PULL_OFF, GPIO_PULL_UP, GPIO_PULL_DOWN };
+
+/**
+ * \brief PORT direction settins
+ */
+enum gpio_direction { GPIO_DIRECTION_OFF, GPIO_DIRECTION_IN, GPIO_DIRECTION_OUT };
+
+/**
+ * \brief PORT group abstraction
+ */
+
+enum gpio_port { GPIO_PORTA, GPIO_PORTB, GPIO_PORTC, GPIO_PORTD, GPIO_PORTE };
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Port initialization function
+ *
+ * Port initialization function should setup the port module based
+ * on a static configuration file, this function should normally
+ * not be called directly, but is a part of hal_init()
+ */
+void _gpio_init(void);
+
+/**
+ * \brief Set direction on port with mask
+ *
+ * Set data direction for each pin, or disable the pin
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means apply direction setting to the
+ * corresponding pin
+ * \param[in] direction GPIO_DIRECTION_OFF = set pin direction to input
+ * and disable input buffer to disable the pin
+ * GPIO_DIRECTION_IN = set pin direction to input
+ * and enable input buffer to enable the pin
+ * GPIO_DIRECTION_OUT = set pin direction to output
+ * and disable input buffer
+ */
+static inline void _gpio_set_direction(const enum gpio_port port, const uint32_t mask,
+ const enum gpio_direction direction);
+
+/**
+ * \brief Set output level on port with mask
+ *
+ * Sets output state on pin to high or low with pin masking
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means apply direction setting to
+ * the corresponding pin
+ * \param[in] level true = pin level is set to 1
+ * false = pin level is set to 0
+ */
+static inline void _gpio_set_level(const enum gpio_port port, const uint32_t mask, const bool level);
+
+/**
+ * \brief Change output level to the opposite with mask
+ *
+ * Change pin output level to the opposite with pin masking
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] mask Bit mask where 1 means apply direction setting to
+ * the corresponding pin
+ */
+static inline void _gpio_toggle_level(const enum gpio_port port, const uint32_t mask);
+
+/**
+ * \brief Get input levels on all port pins
+ *
+ * Get input level on all port pins, will read IN register if configured to
+ * input and OUT register if configured as output
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ */
+static inline uint32_t _gpio_get_level(const enum gpio_port port);
+
+/**
+ * \brief Set pin pull mode
+ *
+ * Set pull mode on a single pin
+ *
+ * \notice This function will automatically change pin direction to input
+ *
+ * \param[in] port Ports are grouped into groups of maximum 32 pins,
+ * GPIO_PORTA = group 0, GPIO_PORTB = group 1, etc
+ * \param[in] pin The pin in the group that pull mode should be selected
+ * for
+ * \param[in] pull_mode GPIO_PULL_OFF = pull resistor on pin is disabled
+ * GPIO_PULL_DOWN = pull resistor on pin will pull pin
+ * level to ground level
+ * GPIO_PULL_UP = pull resistor on pin will pull pin
+ * level to VCC
+ */
+static inline void _gpio_set_pin_pull_mode(const enum gpio_port port, const uint8_t pin,
+ const enum gpio_pull_mode pull_mode);
+
+/**
+ * \brief Set gpio function
+ *
+ * Select which function a gpio is used for
+ *
+ * \param[in] gpio The gpio to set function for
+ * \param[in] function The gpio function is given by a 32-bit wide bitfield
+ * found in the header files for the device
+ *
+ */
+static inline void _gpio_set_pin_function(const uint32_t gpio, const uint32_t function);
+
+#include <hpl_gpio_base.h>
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_GPIO_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_async.h
new file mode 100644
index 000000000..c00d7e733
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_async.h
@@ -0,0 +1,215 @@
+/**
+ * \file
+ *
+ * \brief I2C Master Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_M_ASYNC_H_INCLUDED
+#define _HPL_I2C_M_ASYNC_H_INCLUDED
+
+#include "hpl_i2c_m_sync.h"
+#include "hpl_irq.h"
+#include "utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c master callback names
+ */
+enum _i2c_m_async_callback_type {
+ I2C_M_ASYNC_DEVICE_ERROR,
+ I2C_M_ASYNC_DEVICE_TX_COMPLETE,
+ I2C_M_ASYNC_DEVICE_RX_COMPLETE
+};
+
+struct _i2c_m_async_device;
+
+typedef void (*_i2c_complete_cb_t)(struct _i2c_m_async_device *i2c_dev);
+typedef void (*_i2c_error_cb_t)(struct _i2c_m_async_device *i2c_dev, int32_t errcode);
+
+/**
+ * \brief i2c callback pointers structure
+ */
+struct _i2c_m_async_callback {
+ _i2c_error_cb_t error;
+ _i2c_complete_cb_t tx_complete;
+ _i2c_complete_cb_t rx_complete;
+};
+
+/**
+ * \brief i2c device structure
+ */
+struct _i2c_m_async_device {
+ struct _i2c_m_service service;
+ void * hw;
+ struct _i2c_m_async_callback cb;
+ struct _irq_descriptor irq;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize I2C in interrupt mode
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] i2c_dev The pointer to i2c interrupt device structure
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_init(struct _i2c_m_async_device *const i2c_dev, void *const hw);
+
+/**
+ * \brief Deinitialize I2C in interrupt mode
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_deinit(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_enable(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_disable(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Transfer data by I2C
+ *
+ * This function does low level I2C data transfer.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] msg The pointer to i2c msg structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_transfer(struct _i2c_m_async_device *const i2c_dev, struct _i2c_m_msg *msg);
+
+/**
+ * \brief Set baud rate of I2C
+ *
+ * This function does low level I2C set baud rate.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] clkrate The clock rate(KHz) input to i2c module
+ * \param[in] baudrate The demand baud rate(KHz) of i2c module
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_set_baudrate(struct _i2c_m_async_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate);
+
+/**
+ * \brief Register callback to I2C
+ *
+ * This function does low level I2C callback register.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] cb_type The callback type request
+ * \param[in] func The callback function pointer
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_register_callback(struct _i2c_m_async_device *i2c_dev, enum _i2c_m_async_callback_type cb_type,
+ FUNC_PTR func);
+
+/**
+ * \brief Generate stop condition on the I2C bus
+ *
+ * This function will generate a stop condition on the I2C bus
+ *
+ * \param[in] i2c_m_async_descriptor An i2c descriptor which is used to communicate through I2C
+ *
+ * \return Operation status
+ * \retval 0 Operation executed successfully
+ * \retval <0 Operation failed
+ */
+int32_t _i2c_m_async_send_stop(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Returns the number of bytes left or not used in the I2C message buffer
+ *
+ * This function will return the number of bytes left (not written to the bus) or still free
+ * (not received from the bus) in the message buffer, depending on direction of transmission.
+ *
+ * \param[in] i2c_m_async_descriptor An i2c descriptor which is used to communicate through I2C
+ *
+ * \return Number of bytes or error code
+ * \retval >0 Positive number indicating bytes left
+ * \retval 0 Buffer is full/empty depending on direction
+ * \retval <0 Error code
+ */
+int32_t _i2c_m_async_get_bytes_left(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Enable/disable I2C master interrupt
+ *
+ * param[in] device The pointer to I2C master device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _i2c_m_async_set_irq_state(struct _i2c_m_async_device *const device, const enum _i2c_m_async_callback_type type,
+ const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_sync.h
new file mode 100644
index 000000000..4a643ee65
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_m_sync.h
@@ -0,0 +1,195 @@
+/**
+ * \file
+ *
+ * \brief I2C Master Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_M_SYNC_H_INCLUDED
+#define _HPL_I2C_M_SYNC_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c flags
+ */
+#define I2C_M_RD 0x0001 /* read data, from slave to master */
+#define I2C_M_BUSY 0x0100
+#define I2C_M_TEN 0x0400 /* this is a ten bit chip address */
+#define I2C_M_SEVEN 0x0800 /* this is a seven bit chip address */
+#define I2C_M_FAIL 0x1000
+#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */
+
+/**
+ * \brief i2c Return codes
+ */
+#define I2C_OK 0 /* Operation successful */
+#define I2C_ACK -1 /* Received ACK from device on I2C bus */
+#define I2C_NACK -2 /* Received NACK from device on I2C bus */
+#define I2C_ERR_ARBLOST -3 /* Arbitration lost */
+#define I2C_ERR_BAD_ADDRESS -4 /* Bad address */
+#define I2C_ERR_BUS -5 /* Bus error */
+#define I2C_ERR_BUSY -6 /* Device busy */
+#define I2c_ERR_PACKAGE_COLLISION -7 /* Package collision */
+
+/**
+ * \brief i2c I2C Modes
+ */
+#define I2C_STANDARD_MODE 0x00
+#define I2C_FASTMODE 0x01
+#define I2C_HIGHSPEED_MODE 0x02
+
+/**
+ * \brief i2c master message structure
+ */
+struct _i2c_m_msg {
+ uint16_t addr;
+ volatile uint16_t flags;
+ int32_t len;
+ uint8_t * buffer;
+};
+
+/**
+ * \brief i2c master service
+ */
+struct _i2c_m_service {
+ struct _i2c_m_msg msg;
+ uint16_t mode;
+ uint16_t trise;
+};
+
+/**
+ * \brief i2c sync master device structure
+ */
+struct _i2c_m_sync_device {
+ struct _i2c_m_service service;
+ void * hw;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize I2C
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_init(struct _i2c_m_sync_device *const i2c_dev, void *const hw);
+
+/**
+ * \brief Deinitialize I2C
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_deinit(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_enable(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_disable(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Transfer data by I2C
+ *
+ * This function does low level I2C data transfer.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] msg The pointer to i2c msg structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_transfer(struct _i2c_m_sync_device *const i2c_dev, struct _i2c_m_msg *msg);
+
+/**
+ * \brief Set baud rate of I2C
+ *
+ * This function does low level I2C set baud rate.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] clkrate The clock rate(KHz) input to i2c module
+ * \param[in] baudrate The demand baud rate(KHz) of i2c module
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_set_baudrate(struct _i2c_m_sync_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate);
+
+/**
+ * \brief Send send condition on the I2C bus
+ *
+ * This function will generate a stop condition on the I2C bus
+ *
+ * \param[in] i2c_dev The pointer to i2c device struct
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_send_stop(struct _i2c_m_sync_device *const i2c_dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_async.h
new file mode 100644
index 000000000..b240478f7
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_async.h
@@ -0,0 +1,194 @@
+/**
+ * \file
+ *
+ * \brief I2C Slave Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_S_ASYNC_H_INCLUDED
+#define _HPL_I2C_S_ASYNC_H_INCLUDED
+
+#include "hpl_i2c_s_sync.h"
+#include "hpl_irq.h"
+#include "utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c callback types
+ */
+enum _i2c_s_async_callback_type { I2C_S_DEVICE_ERROR, I2C_S_DEVICE_TX, I2C_S_DEVICE_RX_COMPLETE };
+
+/**
+ * \brief Forward declaration of I2C Slave device
+ */
+struct _i2c_s_async_device;
+
+/**
+ * \brief i2c slave callback function type
+ */
+typedef void (*_i2c_s_async_cb_t)(struct _i2c_s_async_device *device);
+
+/**
+ * \brief i2c slave callback pointers structure
+ */
+struct _i2c_s_async_callback {
+ void (*error)(struct _i2c_s_async_device *const device);
+ void (*tx)(struct _i2c_s_async_device *const device);
+ void (*rx_done)(struct _i2c_s_async_device *const device, const uint8_t data);
+};
+
+/**
+ * \brief i2c slave device structure
+ */
+struct _i2c_s_async_device {
+ void * hw;
+ struct _i2c_s_async_callback cb;
+ struct _irq_descriptor irq;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize asynchronous I2C slave
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] device The pointer to i2c interrupt device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_init(struct _i2c_s_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize asynchronous I2C in interrupt mode
+ *
+ * \param[in] device The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_deinit(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_enable(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_disable(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Cheking status
+ * \retval 1 10-bit addressing mode is on
+ * \retval 0 10-bit addressing mode is off
+ */
+int32_t _i2c_s_async_is_10bit_addressing_on(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Set I2C slave address
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] address Address to set
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_set_address(struct _i2c_s_async_device *const device, const uint16_t address);
+
+/**
+ * \brief Write a byte to the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] data Data to write
+ */
+void _i2c_s_async_write_byte(struct _i2c_s_async_device *const device, const uint8_t data);
+
+/**
+ * \brief Retrieve I2C slave status
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ *\return I2C slave status
+ */
+i2c_s_status_t _i2c_s_async_get_status(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Abort data transmission
+ *
+ * \param[in] device The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_abort_transmission(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Enable/disable I2C slave interrupt
+ *
+ * param[in] device The pointer to I2C slave device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] disable Enable or disable
+ */
+int32_t _i2c_s_async_set_irq_state(struct _i2c_s_async_device *const device, const enum _i2c_s_async_callback_type type,
+ const bool disable);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_I2C_S_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_sync.h
new file mode 100644
index 000000000..a0f4fa465
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_i2c_s_sync.h
@@ -0,0 +1,185 @@
+/**
+ * \file
+ *
+ * \brief I2C Slave Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_S_SYNC_H_INCLUDED
+#define _HPL_I2C_S_SYNC_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief I2C Slave status type
+ */
+typedef uint32_t i2c_s_status_t;
+
+/**
+ * \brief i2c slave device structure
+ */
+struct _i2c_s_sync_device {
+ void *hw;
+};
+
+#include <compiler.h>
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize synchronous I2C slave
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_init(struct _i2c_s_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize synchronous I2C slave
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_deinit(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_enable(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_disable(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Cheking status
+ * \retval 1 10-bit addressing mode is on
+ * \retval 0 10-bit addressing mode is off
+ */
+int32_t _i2c_s_sync_is_10bit_addressing_on(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Set I2C slave address
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] address Address to set
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_set_address(struct _i2c_s_sync_device *const device, const uint16_t address);
+
+/**
+ * \brief Write a byte to the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] data Data to write
+ */
+void _i2c_s_sync_write_byte(struct _i2c_s_sync_device *const device, const uint8_t data);
+
+/**
+ * \brief Retrieve I2C slave status
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ *\return I2C slave status
+ */
+i2c_s_status_t _i2c_s_sync_get_status(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Read a byte from the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Data received via I2C interface.
+ */
+uint8_t _i2c_s_sync_read_byte(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if I2C is ready to send next byte
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Status of the ready check.
+ * \retval true if the I2C is ready to send next byte
+ * \retval false if the I2C is not ready to send next byte
+ */
+bool _i2c_s_sync_is_byte_sent(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if there is data received by I2C
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Status of the data received check.
+ * \retval true if the I2C has received a byte
+ * \retval false if the I2C has not received a byte
+ */
+bool _i2c_s_sync_is_byte_received(const struct _i2c_s_sync_device *const device);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_I2C_S_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_init.h b/atmel-samd/asf4/samd21/hal/include/hpl_init.h
new file mode 100644
index 000000000..be54600c0
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_init.h
@@ -0,0 +1,134 @@
+/**
+ * \file
+ *
+ * \brief Init related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_INIT_H_INCLUDED
+#define _HPL_INIT_H_INCLUDED
+
+/**
+ * \addtogroup HPL Init
+ *
+ * \section hpl_init_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initializes clock sources
+ */
+void _sysctrl_init_sources(void);
+
+/**
+ * \brief Initializes Power Manager
+ */
+void _pm_init(void);
+
+/**
+ * \brief Initialize generators
+ */
+void _gclk_init_generators(void);
+
+/**
+ * \brief Initialize 32 kHz clock sources
+ */
+void _osc32kctrl_init_sources(void);
+
+/**
+ * \brief Initialize clock sources
+ */
+void _oscctrl_init_sources(void);
+
+/**
+ * \brief Initialize clock sources that need input reference clocks
+ */
+void _sysctrl_init_referenced_generators(void);
+
+/**
+ * \brief Initialize clock sources that need input reference clocks
+ */
+void _oscctrl_init_referenced_generators(void);
+
+/**
+ * \brief Initialize master clock generator
+ */
+void _mclk_init(void);
+
+/**
+ * \brief Initialize clock generator
+ */
+void _lpmcu_misc_regs_init(void);
+
+/**
+ * \brief Initialize clock generator
+ */
+void _pmc_init(void);
+
+/**
+ * \brief Set performance level
+ *
+ * \param[in] level The performance level to set
+ */
+void _set_performance_level(const uint8_t level);
+
+/**
+ * \brief Initialize the chip
+ */
+void _init_chip(void);
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_INIT_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_irq.h b/atmel-samd/asf4/samd21/hal/include/hpl_irq.h
new file mode 100644
index 000000000..7325b5711
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_irq.h
@@ -0,0 +1,126 @@
+/**
+ * \file
+ *
+ * \brief IRQ related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_IRQ_H_INCLUDED
+#define _HPL_IRQ_H_INCLUDED
+
+/**
+ * \addtogroup HPL IRQ
+ *
+ * \section hpl_irq_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief IRQ descriptor
+ */
+struct _irq_descriptor {
+ void (*handler)(void *parameter);
+ void *parameter;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Retrieve current IRQ number
+ *
+ * \return The current IRQ number
+ */
+uint8_t _irq_get_current(void);
+
+/**
+ * \brief Disable the given IRQ
+ *
+ * \param[in] n The number of IRQ to disable
+ */
+void _irq_disable(uint8_t n);
+
+/**
+ * \brief Set the given IRQ
+ *
+ * \param[in] n The number of IRQ to set
+ */
+void _irq_set(uint8_t n);
+
+/**
+ * \brief Clear the given IRQ
+ *
+ * \param[in] n The number of IRQ to clear
+ */
+void _irq_clear(uint8_t n);
+
+/**
+ * \brief Enable the given IRQ
+ *
+ * \param[in] n The number of IRQ to enable
+ */
+void _irq_enable(uint8_t n);
+
+/**
+ * \brief Register IRQ handler
+ *
+ * \param[in] number The number registered IRQ
+ * \param[in] irq The pointer to irq handler to register
+ *
+ * \return The status of IRQ handler registering
+ * \retval -1 Passed parameters were invalid
+ * \retval 0 The registering is completed successfully
+ */
+void _irq_register(const uint8_t number, struct _irq_descriptor *const irq);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_IRQ_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_missing_features.h b/atmel-samd/asf4/samd21/hal/include/hpl_missing_features.h
new file mode 100644
index 000000000..90fa16be4
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_missing_features.h
@@ -0,0 +1,47 @@
+/**
+ * \file
+ *
+ * \brief Family-dependent missing features expected by HAL
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_MISSING_FEATURES
+#define _HPL_MISSING_FEATURES
+
+#endif /* _HPL_MISSING_FEATURES */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_pwm.h b/atmel-samd/asf4/samd21/hal/include/hpl_pwm.h
new file mode 100644
index 000000000..8deb54cc0
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_pwm.h
@@ -0,0 +1,203 @@
+/**
+ * \file
+ *
+ * \brief PWM related functionality declaration.
+ *
+ * Copyright (C) 2014-2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_PWM_H_INCLUDED
+#define _HPL_PWM_H_INCLUDED
+
+/**
+ * \addtogroup HPL PWM
+ *
+ * \section hpl_pwm_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief PWM callback types
+ */
+enum _pwm_callback_type { PWM_DEVICE_PERIOD_CB, PWM_DEVICE_ERROR_CB };
+
+/**
+ * \brief PWM pulse-width period
+ */
+typedef uint32_t pwm_period_t;
+
+/**
+ * \brief PWM device structure
+ *
+ * The PWM device structure forward declaration.
+ */
+struct _pwm_device;
+
+/**
+ * \brief PWM interrupt callbacks
+ */
+struct _pwm_callback {
+ void (*pwm_period_cb)(struct _pwm_device *device);
+ void (*pwm_error_cb)(struct _pwm_device *device);
+};
+
+/**
+ * \brief PWM descriptor device structure
+ */
+struct _pwm_device {
+ struct _pwm_callback callback;
+ struct _irq_descriptor irq;
+ void * hw;
+};
+
+/**
+ * \brief PWM functions, pointers to low-level functions
+ */
+struct _pwm_hpl_interface {
+ int32_t (*init)(struct _pwm_device *const device, void *const hw);
+ void (*deinit)(struct _pwm_device *const device);
+ void (*start_pwm)(struct _pwm_device *const device);
+ void (*stop_pwm)(struct _pwm_device *const device);
+ void (*set_pwm_param)(struct _pwm_device *const device, const pwm_period_t period, const pwm_period_t duty_cycle);
+ bool (*is_pwm_enabled)(const struct _pwm_device *const device);
+ pwm_period_t (*pwm_get_period)(const struct _pwm_device *const device);
+ uint32_t (*pwm_get_duty)(const struct _pwm_device *const device);
+ void (*set_irq_state)(struct _pwm_device *const device, const enum _pwm_callback_type type, const bool disable);
+};
+/**
+ * \brief Initialize TC
+ *
+ * This function does low level TC configuration.
+ *
+ * \param[in] device The pointer to PWM device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status.
+ */
+int32_t _pwm_init(struct _pwm_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize TC
+ *
+ * \param[in] device The pointer to PWM device instance
+ */
+void _pwm_deinit(struct _pwm_device *const device);
+
+/**
+ * \brief Retrieve offset of the given tc hardware instance
+ *
+ * \param[in] device The pointer to PWM device instance
+ *
+ * \return The offset of the given tc hardware instance
+ */
+uint8_t _pwm_get_hardware_offset(const struct _pwm_device *const device);
+
+/**
+ * \brief Start hardware pwm
+ *
+ * \param[in] device The pointer to PWM device instance
+ */
+void _pwm_enable(struct _pwm_device *const device);
+
+/**
+ * \brief Stop hardware pwm
+ *
+ * \param[in] device The pointer to PWM device instance
+ */
+void _pwm_disable(struct _pwm_device *const device);
+
+/**
+ * \brief Set pwm parameter
+ *
+ * \param[in] device The pointer to PWM device instance
+ * \param[in] period Total period of one PWM cycle.
+ * \param[in] duty_cycle Period of PWM first half during one cycle.
+ */
+void _pwm_set_param(struct _pwm_device *const device, const pwm_period_t period, const pwm_period_t duty_cycle);
+
+/**
+ * \brief Check if pwm is working
+ *
+ * \param[in] device The pointer to PWM device instance
+ *
+ * \return Check status.
+ * \retval true The given pwm is working
+ * \retval false The given pwm is not working
+ */
+bool _pwm_is_enabled(const struct _pwm_device *const device);
+
+/**
+ * \brief Get pwm waveform period value
+ *
+ * \param[in] device The pointer to PWM device instance
+ *
+ * \return Period value.
+ */
+pwm_period_t _pwm_get_period(const struct _pwm_device *const device);
+
+/**
+ * \brief Get pwm waveform duty cycle value
+ *
+ * \param[in] device The pointer to PWM device instance
+ *
+ * \return Duty cycle value
+ */
+uint32_t _pwm_get_duty(const struct _pwm_device *const device);
+
+/**
+ * \brief Enable/disable PWM interrupt
+ *
+ * param[in] device The pointer to PWM device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] disable Enable or disable
+ */
+void _pwm_set_irq_state(struct _pwm_device *const device, const enum _pwm_callback_type type, const bool disable);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_PWM_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_reset.h b/atmel-samd/asf4/samd21/hal/include/hpl_reset.h
new file mode 100644
index 000000000..868591ee6
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_reset.h
@@ -0,0 +1,102 @@
+/**
+ * \file
+ *
+ * \brief Reset related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_RESET_H_INCLUDED
+#define _HPL_RESET_H_INCLUDED
+
+/**
+ * \addtogroup HPL Reset
+ *
+ * \section hpl_reset_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#ifndef _UNIT_TEST_
+#include <compiler.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Reset reason enumeration
+ *
+ * The list of possible reset reasons.
+ */
+enum reset_reason {
+ RESET_REASON_POR = 1,
+ RESET_REASON_BOD12 = 2,
+ RESET_REASON_BOD33 = 4,
+ RESET_REASON_EXT = 8,
+ RESET_REASON_WDT = 16,
+ RESET_REASON_SYST = 32,
+ RESET_REASON_BACKUP = 64
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Retrieve the reset reason
+ *
+ * Retrieves the reset reason of the last MCU reset.
+ *
+ *\return An enum value indicating the reason of the last reset.
+ */
+enum reset_reason _get_reset_reason(void);
+
+/**
+ * \brief Reset MCU
+ */
+void _reset_mcu(void);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_RESET_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_sleep.h b/atmel-samd/asf4/samd21/hal/include/hpl_sleep.h
new file mode 100644
index 000000000..3bd6a1cb2
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_sleep.h
@@ -0,0 +1,98 @@
+/**
+ * \file
+ *
+ * \brief Sleep related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SLEEP_H_INCLUDED
+#define _HPL_SLEEP_H_INCLUDED
+
+/**
+ * \addtogroup HPL Sleep
+ *
+ * \section hpl_sleep_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#ifndef _UNIT_TEST_
+#include <compiler.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Set the sleep mode for the device
+ *
+ * This function sets the sleep mode for the device.
+ * For an overview of which systems are disabled in sleep for the different
+ * sleep modes see datasheet.
+ *
+ * \param[in] mode Sleep mode to use
+ *
+ * \return the status of a sleep request
+ * \retval -1 The requested sleep mode was invalid
+ * \retval 0 The operation completed successfully, sleep mode is set
+ */
+int32_t _set_sleep_mode(const uint8_t mode);
+
+/**
+ * \brief Reset MCU
+ */
+void _reset_mcu(void);
+
+/**
+ * \brief Put MCU to sleep
+ */
+void _go_to_sleep(void);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_SLEEP_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi.h
new file mode 100644
index 000000000..14177642f
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi.h
@@ -0,0 +1,173 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (C) 2014 - 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_H_INCLUDED
+#define _HPL_SPI_H_INCLUDED
+
+#include <compiler.h>
+#include <utils.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief SPI Dummy char is used when reading data from the SPI slave
+ */
+#define SPI_DUMMY_CHAR 0x1ff
+
+/**
+ * \brief SPI message to let driver to process
+ */
+//@{
+struct spi_msg {
+ /** Pointer to the output data buffer */
+ uint8_t *txbuf;
+ /** Pointer to the input data buffer */
+ uint8_t *rxbuf;
+ /** Size of the message data in SPI characters */
+ uint32_t size;
+};
+//@}
+
+/**
+ * \brief SPI transfer modes
+ * SPI transfer mode controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ */
+enum spi_transfer_mode {
+ /** Leading edge is rising edge, data sample on leading edge. */
+ SPI_MODE_0,
+ /** Leading edge is rising edge, data sample on trailing edge. */
+ SPI_MODE_1,
+ /** Leading edge is falling edge, data sample on leading edge. */
+ SPI_MODE_2,
+ /** Leading edge is falling edge, data sample on trailing edge. */
+ SPI_MODE_3
+};
+
+/**
+ * \brief SPI character sizes
+ * The character size influence the way the data is sent/received.
+ * For char size <= 8 data is stored byte by byte.
+ * For char size between 9 ~ 16 data is stored in 2-byte length.
+ * Note that the default and recommended char size is 8 bit since it's
+ * supported by all system.
+ */
+enum spi_char_size {
+ /** Character size is 8 bit. */
+ SPI_CHAR_SIZE_8 = 0,
+ /** Character size is 9 bit. */
+ SPI_CHAR_SIZE_9 = 1,
+ /** Character size is 10 bit. */
+ SPI_CHAR_SIZE_10 = 2,
+ /** Character size is 11 bit. */
+ SPI_CHAR_SIZE_11 = 3,
+ /** Character size is 12 bit. */
+ SPI_CHAR_SIZE_12 = 4,
+ /** Character size is 13 bit. */
+ SPI_CHAR_SIZE_13 = 5,
+ /** Character size is 14 bit. */
+ SPI_CHAR_SIZE_14 = 6,
+ /** Character size is 15 bit. */
+ SPI_CHAR_SIZE_15 = 7,
+ /** Character size is 16 bit. */
+ SPI_CHAR_SIZE_16 = 8
+};
+
+/**
+ * \brief SPI data order
+ */
+enum spi_data_order {
+ /** MSB goes first. */
+ SPI_DATA_ORDER_MSB_1ST = 0,
+ /** LSB goes first. */
+ SPI_DATA_ORDER_LSB_1ST = 1
+};
+
+/** \brief Transfer descriptor for SPI
+ * Transfer descriptor holds TX and RX buffers
+ */
+struct spi_xfer {
+ /** Pointer to data buffer to TX */
+ uint8_t *txbuf;
+ /** Pointer to data buffer to RX */
+ uint8_t *rxbuf;
+ /** Size of data characters to TX & RX */
+ uint32_t size;
+};
+
+/** SPI generic driver. */
+struct spi_dev {
+ /** Pointer to the hardware base or private data for special device. */
+ void *prvt;
+ /** Reference start of sync/async variables */
+ uint32_t sync_async_misc[1];
+};
+
+/**
+ * \brief Calculate the baudrate value for hardware to use to set baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] clk Clock frequency (Hz) for baudrate generation.
+ * \param[in] baud Target baudrate (bps).
+ * \return Error or baudrate value.
+ * \retval >0 Baudrate value.
+ * \retval ERR_INVALID_ARG Calculation fail.
+ */
+int32_t _spi_calc_baud_val(struct spi_dev *dev, const uint32_t clk, const uint32_t baud);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_async.h
new file mode 100644
index 000000000..b81ef12af
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_async.h
@@ -0,0 +1,137 @@
+/**
+ * \file
+ *
+ * \brief Common SPI related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_ASYNC_H_INCLUDED
+#define _HPL_SPI_ASYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_irq.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Callbacks the SPI driver must offer in async mode
+ */
+//@{
+/** The callback types */
+enum _spi_async_dev_cb_type {
+ /** Callback type for transmit, see \ref _spi_async_dev_cb_xfer_t. */
+ SPI_DEV_CB_TX,
+ /** Callback type for receive, see \ref _spi_async_dev_cb_xfer_t. */
+ SPI_DEV_CB_RX,
+ /** Callback type for \ref _spi_async_dev_cb_complete_t. */
+ SPI_DEV_CB_COMPLETE,
+ /** Number of callbacks. */
+ SPI_DEV_CB_N
+};
+
+struct _spi_async_dev;
+
+/** \brief The prototype for callback on SPI transfer complete.
+ * If status code is zero, it indicates the normal completion, that is,
+ * SS deactivation.
+ * If status code belows zero, it indicates complete.
+ */
+typedef void (*_spi_async_dev_cb_complete_t)(struct _spi_async_dev *dev, int32_t status);
+
+/** \brief The prototype for callback on SPI transmit/receive event
+ * For TX, the callback is invoked when transmit is done or ready to start
+ * transmit.
+ * For RX, the callback is invoked when receive is done or ready to read data,
+ * see \ref _spi_async_dev_read_one_t on data reading.
+ * Without DMA enabled, the callback is invoked on each character event.
+ * With DMA enabled, the callback is invoked on DMA buffer done.
+ */
+typedef void (*_spi_async_dev_cb_xfer_t)(struct _spi_async_dev *dev);
+
+/**
+ * \brief The callbacks offered by SPI driver
+ */
+struct _spi_async_dev_callbacks {
+ /** TX callback, see \ref _spi_async_dev_cb_xfer_t. */
+ _spi_async_dev_cb_xfer_t tx;
+ /** RX callback, see \ref _spi_async_dev_cb_xfer_t. */
+ _spi_async_dev_cb_xfer_t rx;
+ /** Complete or complete callback, see \ref _spi_async_dev_cb_complete_t. */
+ _spi_async_dev_cb_complete_t complete;
+};
+//@}
+
+/**
+ * \brief SPI async driver
+ */
+//@{
+
+/** SPI driver to support async HAL */
+struct _spi_async_dev {
+ /** Pointer to the hardware base or private data for special device. */
+ void *prvt;
+ /** Data size, number of bytes for each character */
+ uint8_t char_size;
+ /** Dummy byte used in master mode when reading the slave */
+ uint16_t dummy_byte;
+
+ /** \brief Pointer to callback functions, ignored for polling mode
+ * Pointer to the callback functions so that initialize the driver to
+ * handle interrupts.
+ */
+ struct _spi_async_dev_callbacks callbacks;
+ /** IRQ instance for SPI device. */
+ struct _irq_descriptor irq;
+};
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_dma.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_dma.h
new file mode 100644
index 000000000..3f2088c05
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_dma.h
@@ -0,0 +1,98 @@
+/**
+ * \file
+ *
+ * \brief Common SPI DMA related functionality declaration.
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_DMA_H_INCLUDED
+#define _HPL_SPI_DMA_H_INCLUDED
+
+#include <hpl_irq.h>
+#include <hpl_dma.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** The callback types */
+enum _spi_dma_dev_cb_type {
+ /** Callback type for DMA transmit. */
+ SPI_DEV_CB_DMA_TX,
+ /** Callback type for DMA receive. */
+ SPI_DEV_CB_DMA_RX,
+ /** Callback type for DMA error. */
+ SPI_DEV_CB_DMA_ERROR,
+ /** Number of callbacks. */
+ SPI_DEV_CB_DMA_N
+};
+
+struct _spi_dma_dev;
+
+/**
+ * \brief The prototype for callback on SPI DMA.
+ */
+typedef void (*_spi_dma_cb_t)(struct _dma_resource *resource);
+
+/**
+ * \brief The callbacks offered by SPI driver
+ */
+struct _spi_dma_dev_callbacks {
+ _spi_dma_cb_t tx;
+ _spi_dma_cb_t rx;
+ _spi_dma_cb_t error;
+};
+
+/** SPI driver to support DMA HAL */
+struct _spi_dma_dev {
+ /** Pointer to the hardware base or private data for special device. */
+ void *prvt;
+ /** Pointer to callback functions */
+ struct _spi_dma_dev_callbacks callbacks;
+ /** IRQ instance for SPI device. */
+ struct _irq_descriptor irq;
+ /** DMA resource */
+ struct _dma_resource *resource;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef _HPL_SPI_DMA_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_async.h
new file mode 100644
index 000000000..f2d330495
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_async.h
@@ -0,0 +1,248 @@
+/**
+ * \file
+ *
+ * \brief SPI Slave Async related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_ASYNC_H_INCLUDED
+#define _HPL_SPI_M_ASYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_async.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_m_async_dev _spi_async_dev
+
+#define _spi_m_async_dev_cb_type _spi_async_dev_cb_type
+
+/** Uses common SPI async device driver complete callback type. */
+#define _spi_m_async_dev_cb_complete_t _spi_async_dev_cb_complete_t
+
+/** Uses common SPI async device driver transfer callback type. */
+#define _spi_m_async_dev_cb_xfer_t _spi_async_dev_cb_xfer_t
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * It will load default hardware configuration and software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval ERR_DENIED SPI has been enabled.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_init(struct _spi_m_async_dev *dev, void *const hw);
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * Disable, reset the hardware and the software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_deinit(struct _spi_m_async_dev *dev);
+
+/**
+ * \brief Enable SPI for access with interrupts
+ * Enable the SPI and enable callback generation of receive and error
+ * interrupts.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_enable(struct _spi_m_async_dev *dev);
+
+/**
+ * \brief Disable SPI for access without interrupts
+ * Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_disable(struct _spi_m_async_dev *dev);
+
+/**
+ * \brief Set SPI transfer mode
+ * Set SPI transfer mode (\ref spi_transfer_mode),
+ * which controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] mode The SPI transfer mode.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_mode(struct _spi_m_async_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ * how it's generated.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_baudrate(struct _spi_m_async_dev *dev, const uint32_t baud_val);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] char_size The character size, see \ref spi_char_size.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_char_size(struct _spi_m_async_dev *dev, const enum spi_char_size char_size);
+
+/**
+ * \brief Set SPI data order
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] dord SPI data order (LSB/MSB first).
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_data_order(struct _spi_m_async_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable output interrupt
+ * false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_m_async_enable_tx(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable input interrupts
+ * false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_m_async_enable_rx(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on Slave Select (SS) rising
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable input interrupts
+ * false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_m_async_enable_ss_detect(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ * \brief Read one character to SPI device instance
+ * \param[in, out] dev Pointer to the SPI device instance.
+ *
+ * \return Character read from SPI module
+ */
+uint16_t _spi_m_async_read_one(struct _spi_m_async_dev *dev);
+
+/**
+ * \brief Write one character to assigned buffer
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] data
+ *
+ * \return Status code of write operation
+ * \retval 0 Write operation OK
+ */
+int32_t _spi_m_async_write_one(struct _spi_m_async_dev *dev, uint16_t data);
+
+/**
+ * \brief Register the SPI device callback
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] cb_type The callback type.
+ * \param[in] func The callback function to register. NULL to disable callback.
+ * \return Always 0.
+ */
+int32_t _spi_m_async_register_callback(struct _spi_m_async_dev *dev, const enum _spi_m_async_dev_cb_type cb_type,
+ const FUNC_PTR func);
+
+/**
+ * \brief Enable/disable SPI master interrupt
+ *
+ * param[in] device The pointer to SPI master device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _spi_m_async_set_irq_state(struct _spi_m_async_dev *const device, const enum _spi_m_async_dev_cb_type type,
+ const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_dma.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_dma.h
new file mode 100644
index 000000000..5e676fdc5
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_dma.h
@@ -0,0 +1,187 @@
+/**
+ * \file
+ *
+ * \brief SPI Master DMA related functionality declaration.
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_DMA_H_INCLUDED
+#define _HPL_SPI_M_DMA_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_dma.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI dma device driver. */
+#define _spi_m_dma_dev _spi_dma_dev
+
+#define _spi_m_dma_dev_cb_type _spi_dma_dev_cb_type
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * It will load default hardware configuration and software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval ERR_DENIED SPI has been enabled.
+ * \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_init(struct _spi_m_dma_dev *dev, void *const hw);
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * Disable, reset the hardware and the software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_deinit(struct _spi_m_dma_dev *dev);
+
+/**
+ * \brief Enable SPI for access with interrupts
+ * Enable the SPI and enable callback generation of receive and error
+ * interrupts.
+ * \param[in] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_enable(struct _spi_m_dma_dev *dev);
+
+/**
+ * \brief Disable SPI for access without interrupts
+ * Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ * \param[in] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_disable(struct _spi_m_dma_dev *dev);
+
+/**
+ * \brief Set SPI transfer mode
+ * Set SPI transfer mode (\ref spi_transfer_mode),
+ * which controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ * \param[in] dev Pointer to the SPI device instance.
+ * \param[in] mode The SPI transfer mode.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_set_mode(struct _spi_m_dma_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in] dev Pointer to the SPI device instance.
+ * \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ * how it's generated.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_baudrate(struct _spi_m_dma_dev *dev, const uint32_t baud_val);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] char_size The character size, see \ref spi_char_size.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_char_size(struct _spi_m_dma_dev *dev, const enum spi_char_size char_size);
+
+/**
+ * \brief Set SPI data order
+ * \param[in] dev Pointer to the SPI device instance.
+ * \param[in] dord SPI data order (LSB/MSB first).
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_data_order(struct _spi_m_dma_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Register the SPI device callback
+ * \param[in] dev Pointer to the SPI device instance.
+ * \param[in] cb_type The callback type.
+ * \param[in] func The callback function to register. NULL to disable callback.
+ * \return Always 0.
+ */
+void _spi_m_dma_register_callback(struct _spi_m_dma_dev *dev, enum _spi_dma_dev_cb_type, _spi_dma_cb_t func);
+
+/** \brief Do SPI data transfer (TX & RX) with DMA
+ * Log the TX & RX buffers and transfer them in background. It never blocks.
+ *
+ * \param[in] dev Pointer to the SPI device instance.
+ * \param[in] txbuf Pointer to the transfer information (\ref spi_transfer).
+ * \param[out] rxbuf Pointer to the receiver information (\ref spi_receive).
+ * \param[in] length spi transfer data length.
+ *
+ * \return Operation status.
+ * \retval ERR_NONE Success.
+ * \retval ERR_BUSY Busy.
+ */
+int32_t _spi_m_dma_transfer(struct _spi_m_dma_dev *dev, uint8_t const *txbuf, uint8_t *const rxbuf,
+ const uint16_t length);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_DMA_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_sync.h
new file mode 100644
index 000000000..fff1db4f2
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_m_sync.h
@@ -0,0 +1,171 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_SYNC_H_INCLUDED
+#define _HPL_SPI_M_SYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_sync.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_m_sync_dev _spi_sync_dev
+
+/**
+ * \brief Initialize SPI for access without interrupts
+ * It will load default hardware configuration and software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval ERR_DENIED SPI has been enabled.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_init(struct _spi_m_sync_dev *dev, void *const hw);
+
+/**
+ * \brief Deinitialize SPI
+ * Disable, reset the hardware and the software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_deinit(struct _spi_m_sync_dev *dev);
+
+/**
+ * \brief Enable SPI for access without interrupts
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_enable(struct _spi_m_sync_dev *dev);
+
+/**
+ * \brief Disable SPI for access without interrupts
+ * Disable SPI. Deactivate all CS pins if works as master.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_disable(struct _spi_m_sync_dev *dev);
+
+/**
+ * \brief Set SPI transfer mode
+ * Set SPI transfer mode (\ref spi_transfer_mode),
+ * which controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] mode The SPI transfer mode.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_mode(struct _spi_m_sync_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ * how it's generated.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_baudrate(struct _spi_m_sync_dev *dev, const uint32_t baud_val);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] char_size The character size, see \ref spi_char_size.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_char_size(struct _spi_m_sync_dev *dev, const enum spi_char_size char_size);
+
+/**
+ * \brief Set SPI data order
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] dord SPI data order (LSB/MSB first).
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_data_order(struct _spi_m_sync_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Transfer the whole message without interrupt
+ * Transfer the message, it will keep waiting until the message finish or
+ * error.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] msg Pointer to the message instance to process.
+ * \return Error or number of characters transferred.
+ * \retval ERR_BUSY SPI hardware is not ready to start transfer (not
+ * enabled, busy applying settings, ...).
+ * \retval SPI_ERR_OVERFLOW Overflow error.
+ * \retval >=0 Number of characters transferred.
+ */
+int32_t _spi_m_sync_trans(struct _spi_m_sync_dev *dev, const struct spi_msg *msg);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_async.h
new file mode 100644
index 000000000..aec3c0a6f
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_async.h
@@ -0,0 +1,227 @@
+/**
+ * \file
+ *
+ * \brief SPI Slave Async related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_S_ASYNC_H_INCLUDED
+#define _HPL_SPI_S_ASYNC_H_INCLUDED
+
+#include <hpl_spi_async.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_s_async_dev _spi_async_dev
+
+#define _spi_s_async_dev_cb_type _spi_async_dev_cb_type
+
+/** Uses common SPI async device driver complete callback type. */
+#define _spi_s_async_dev_cb_complete_t _spi_async_dev_cb_complete_t
+
+/** Uses common SPI async device driver transfer callback type. */
+#define _spi_s_async_dev_cb_xfer_t _spi_async_dev_cb_xfer_t
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * It will load default hardware configuration and software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval ERR_DENIED SPI has been enabled.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_init(struct _spi_s_async_dev *dev, void *const hw);
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * Disable, reset the hardware and the software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_deinit(struct _spi_s_async_dev *dev);
+
+/**
+ * \brief Enable SPI for access with interrupts
+ * Enable the SPI and enable callback generation of receive and error
+ * interrupts.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_enable(struct _spi_s_async_dev *dev);
+
+/**
+ * \brief Disable SPI for access without interrupts
+ * Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_disable(struct _spi_s_async_dev *dev);
+
+/**
+ * \brief Set SPI transfer mode
+ * Set SPI transfer mode (\ref spi_transfer_mode),
+ * which controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] mode The SPI transfer mode.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_mode(struct _spi_s_async_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] char_size The character size, see \ref spi_char_size.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_char_size(struct _spi_s_async_dev *dev, const enum spi_char_size char_size);
+
+/**
+ * \brief Set SPI data order
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] dord SPI data order (LSB/MSB first).
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_data_order(struct _spi_s_async_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable output interrupt
+ * false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_s_async_enable_tx(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable input interrupts
+ * false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_s_async_enable_rx(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on Slave Select (SS) rising
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable input interrupts
+ * false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_s_async_enable_ss_detect(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ * \brief Read one character to SPI device instance
+ * \param[in, out] dev Pointer to the SPI device instance.
+ *
+ * \return Character read from SPI module
+ */
+uint16_t _spi_s_async_read_one(struct _spi_s_async_dev *dev);
+
+/**
+ * \brief Write one character to assigned buffer
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] data
+ *
+ * \return Status code of write operation
+ * \retval 0 Write operation OK
+ */
+int32_t _spi_s_async_write_one(struct _spi_s_async_dev *dev, uint16_t data);
+
+/**
+ * \brief Register the SPI device callback
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] cb_type The callback type.
+ * \param[in] func The callback function to register. NULL to disable callback.
+ * \return Always 0.
+ */
+int32_t _spi_s_async_register_callback(struct _spi_s_async_dev *dev, const enum _spi_s_async_dev_cb_type cb_type,
+ const FUNC_PTR func);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_S_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_sync.h
new file mode 100644
index 000000000..d42368697
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_s_sync.h
@@ -0,0 +1,237 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_S_SYNC_H_INCLUDED
+#define _HPL_SPI_S_SYNC_H_INCLUDED
+
+#include <hpl_spi_sync.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_s_sync_dev _spi_sync_dev
+
+/**
+ * \brief Initialize SPI for access without interrupts
+ * It will load default hardware configuration and software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] hw Pointer to the hardware base.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG Input parameter problem.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval ERR_DENIED SPI has been enabled.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_init(struct _spi_s_sync_dev *dev, void *const hw);
+
+/**
+ * \brief Initialize SPI for access with interrupts
+ * Disable, reset the hardware and the software struct.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_deinit(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Enable SPI for access without interrupts
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI hardware not ready (resetting).
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_enable(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Disable SPI for access without interrupts
+ * Disable SPI. Deactivate all CS pins if works as master.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \return Operation status.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_disable(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Set SPI transfer mode
+ * Set SPI transfer mode (\ref spi_transfer_mode),
+ * which controls clock polarity and clock phase.
+ * Mode 0: leading edge is rising edge, data sample on leading edge.
+ * Mode 1: leading edge is rising edge, data sample on trailing edge.
+ * Mode 2: leading edge is falling edge, data sample on leading edge.
+ * Mode 3: leading edge is falling edge, data sample on trailing edge.
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] mode The SPI transfer mode.
+ * \return Operation status.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_mode(struct _spi_s_sync_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ * \brief Set SPI baudrate
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] char_size The character size, see \ref spi_char_size.
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_char_size(struct _spi_s_sync_dev *dev, const enum spi_char_size char_size);
+
+/**
+ * \brief Set SPI data order
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] dord SPI data order (LSB/MSB first).
+ * \return Operation status.
+ * \retval ERR_INVALID_ARG The character size is not supported.
+ * \retval ERR_BUSY SPI is not ready to accept new setting.
+ * \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_data_order(struct _spi_s_sync_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable output interrupt
+ * false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_s_sync_enable_tx(struct _spi_s_sync_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ * \param[in] state true = enable input interrupts
+ * false = disable input interrupt
+ *
+ * \return Status code
+ * \retval 0 OK Status
+ */
+int32_t _spi_s_sync_enable_rx(struct _spi_s_sync_dev *dev, bool state);
+
+/**
+ * \brief Read one character to SPI device instance
+ * \param[in, out] dev Pointer to the SPI device instance.
+ *
+ * \return Character read from SPI module
+ */
+uint16_t _spi_s_sync_read_one(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Write one character to assigned buffer
+ * \param[in, out] dev Pointer to the SPI device instance.
+ * \param[in] data
+ *
+ * \return Status code of write operation
+ * \retval 0 Write operation OK
+ */
+int32_t _spi_s_sync_write_one(struct _spi_s_sync_dev *dev, uint16_t data);
+
+/**
+ * \brief Check if TX ready
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ *
+ * \return TX ready state
+ * \retval true TX ready
+ * \retval false TX not ready
+ */
+bool _spi_s_sync_is_tx_ready(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if RX character ready
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ *
+ * \return RX character ready state
+ * \retval true RX character ready
+ * \retval false RX character not ready
+ */
+bool _spi_s_sync_is_rx_ready(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if SS deactiviation detected
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ *
+ * \return SS deactiviation state
+ * \retval true SS deactiviation detected
+ * \retval false SS deactiviation not detected
+ */
+bool _spi_s_sync_is_ss_deactivated(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if error is detected
+ *
+ * \param[in] dev Pointer to the SPI device instance
+ *
+ * \return Error detection state
+ * \retval true Error detected
+ * \retval false Error not detected
+ */
+bool _spi_s_sync_is_error(struct _spi_s_sync_dev *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_S_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_spi_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_spi_sync.h
new file mode 100644
index 000000000..a231a0bb5
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_spi_sync.h
@@ -0,0 +1,80 @@
+/**
+ * \file
+ *
+ * \brief Common SPI related functionality declaration.
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_SYNC_H_INCLUDED
+#define _HPL_SPI_SYNC_H_INCLUDED
+
+#include <compiler.h>
+#include <utils.h>
+
+#include <hpl_spi.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ * \section hpl_spi_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** SPI driver to support sync HAL */
+struct _spi_sync_dev {
+ /** Pointer to the hardware base or private data for special device. */
+ void *prvt;
+ /** Data size, number of bytes for each character */
+ uint8_t char_size;
+ /** Dummy byte used in master mode when reading the slave */
+ uint16_t dummy_byte;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_SYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_time_measure.h b/atmel-samd/asf4/samd21/hal/include/hpl_time_measure.h
new file mode 100644
index 000000000..7502a5910
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_time_measure.h
@@ -0,0 +1,104 @@
+/**
+ * \file
+ *
+ * \brief Time measure related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_TIME_MEASURE_H_INCLUDED
+#define _HPL_TIME_MEASURE_H_INCLUDED
+
+/**
+ * \addtogroup HPL Time measure
+ *
+ * \section hpl_time_measure_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief System time type
+ */
+typedef uint32_t system_time_t;
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize system time module
+ *
+ * \param[in] hw The pointer to hardware instance to initialize
+ */
+void _system_time_init(void *const hw);
+
+/**
+ * \brief Deinitialize system time module
+ *
+ * \param[in] hw The pointer to hardware instance to initialize
+ */
+void _system_time_deinit(void *const hw);
+
+/**
+ * \brief Get system time
+ *
+ * \param[in] hw The pointer to hardware instance to initialize
+ */
+system_time_t _system_time_get(const void *const hw);
+
+/**
+ * \brief Get maximum possible system time
+ *
+ * \param[in] hw The pointer to hardware instance to initialize
+ */
+system_time_t _system_time_get_max_time_value(const void *const hw);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_TIME_MEASURE_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_timer.h b/atmel-samd/asf4/samd21/hal/include/hpl_timer.h
new file mode 100644
index 000000000..d2434e8c4
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_timer.h
@@ -0,0 +1,170 @@
+/**
+ * \file
+ *
+ * \brief Timer related functionality declaration.
+ *
+ * Copyright (C) 2014 - 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_TIMER_H_INCLUDED
+#define _HPL_TIMER_H_INCLUDED
+
+/**
+ * \addtogroup HPL Timer
+ *
+ * \section hpl_timer_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+#include <hpl_irq.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Timer device structure
+ *
+ * The Timer device structure forward declaration.
+ */
+struct _timer_device;
+
+/**
+ * \brief Timer interrupt callbacks
+ */
+struct _timer_callbacks {
+ void (*period_expired)(struct _timer_device *device);
+};
+
+/**
+ * \brief Timer device structure
+ */
+struct _timer_device {
+ struct _timer_callbacks timer_cb;
+ struct _irq_descriptor irq;
+ void * hw;
+};
+
+/**
+ * \brief Timer functions, pointers to low-level functions
+ */
+struct _timer_hpl_interface {
+ int32_t (*init)(struct _timer_device *const device, void *const hw);
+ void (*deinit)(struct _timer_device *const device);
+ void (*start_timer)(struct _timer_device *const device);
+ void (*stop_timer)(struct _timer_device *const device);
+ void (*set_timer_period)(struct _timer_device *const device, const uint32_t clock_cycles);
+ uint32_t (*get_period)(const struct _timer_device *const device);
+ bool (*is_timer_started)(const struct _timer_device *const device);
+ void (*set_timer_irq)(struct _timer_device *const device);
+};
+/**
+ * \brief Initialize TCC
+ *
+ * This function does low level TCC configuration.
+ *
+ * \param[in] device The pointer to timer device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status.
+ */
+int32_t _timer_init(struct _timer_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize TCC
+ *
+ * \param[in] device The pointer to timer device instance
+ */
+void _timer_deinit(struct _timer_device *const device);
+
+/**
+ * \brief Start hardware timer
+ *
+ * \param[in] device The pointer to timer device instance
+ */
+void _timer_start(struct _timer_device *const device);
+
+/**
+ * \brief Stop hardware timer
+ *
+ * \param[in] device The pointer to timer device instance
+ */
+void _timer_stop(struct _timer_device *const device);
+
+/**
+ * \brief Set timer period
+ *
+ * \param[in] device The pointer to timer device instance
+ */
+void _timer_set_period(struct _timer_device *const device, const uint32_t clock_cycles);
+
+/**
+ * \brief Retrieve timer period
+ *
+ * \param[in] device The pointer to timer device instance
+ *
+ * \return Timer period
+ */
+uint32_t _timer_get_period(const struct _timer_device *const device);
+
+/**
+ * \brief Check if timer is running
+ *
+ * \param[in] device The pointer to timer device instance
+ *
+ * \return Check status.
+ * \retval true The given timer is running
+ * \retval false The given timer is not running
+ */
+bool _timer_is_started(const struct _timer_device *const device);
+
+/**
+ * \brief Set timer IRQ
+ *
+ * \param[in] device The pointer to timer device instance
+ */
+void _timer_set_irq(struct _timer_device *const device);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_TIMER_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usart.h b/atmel-samd/asf4/samd21/hal/include/hpl_usart.h
new file mode 100644
index 000000000..f6235de93
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usart.h
@@ -0,0 +1,123 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USART_H_INCLUDED
+#define _HPL_USART_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART SYNC
+ *
+ * \section hpl_usart_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART flow control state
+ */
+union usart_flow_control_state {
+ struct {
+ uint8_t cts : 1;
+ uint8_t rts : 1;
+ uint8_t unavailable : 1;
+ uint8_t reserved : 5;
+ } bit;
+ uint8_t value;
+};
+
+/**
+ * \brief USART baud rate mode
+ */
+enum usart_baud_rate_mode { USART_BAUDRATE_ASYNCH_ARITHMETIC, USART_BAUDRATE_ASYNCH_FRACTIONAL, USART_BAUDRATE_SYNCH };
+
+/**
+ * \brief USART data order
+ */
+enum usart_data_order { USART_DATA_ORDER_MSB = 0, USART_DATA_ORDER_LSB = 1 };
+
+/**
+ * \brief USART mode
+ */
+enum usart_mode { USART_MODE_ASYNCHRONOUS = 0, USART_MODE_SYNCHRONOUS = 1 };
+
+/**
+ * \brief USART parity
+ */
+enum usart_parity {
+ USART_PARITY_EVEN = 0,
+ USART_PARITY_ODD = 1,
+ USART_PARITY_NONE = 2,
+ USART_PARITY_SPACE = 3,
+ USART_PARITY_MARK = 4
+};
+
+/**
+ * \brief USART stop bits mode
+ */
+enum usart_stop_bits { USART_STOP_BITS_ONE = 0, USART_STOP_BITS_TWO = 1, USART_STOP_BITS_ONE_P_FIVE = 2 };
+
+/**
+ * \brief USART character size
+ */
+enum usart_character_size {
+ USART_CHARACTER_SIZE_8BITS = 0,
+ USART_CHARACTER_SIZE_9BITS = 1,
+ USART_CHARACTER_SIZE_5BITS = 5,
+ USART_CHARACTER_SIZE_6BITS = 6,
+ USART_CHARACTER_SIZE_7BITS = 7
+};
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_USART_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usart_async.h b/atmel-samd/asf4/samd21/hal/include/hpl_usart_async.h
new file mode 100644
index 000000000..1bcb3da44
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usart_async.h
@@ -0,0 +1,280 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USART_ASYNC_H_INCLUDED
+#define _HPL_USART_ASYNC_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART
+ *
+ * \section hpl_usart_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include "hpl_usart.h"
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART callback types
+ */
+enum _usart_async_callback_type { USART_ASYNC_BYTE_SENT, USART_ASYNC_RX_DONE, USART_ASYNC_TX_DONE, USART_ASYNC_ERROR };
+
+/**
+ * \brief USART device structure
+ *
+ * The USART device structure forward declaration.
+ */
+struct _usart_async_device;
+
+/**
+ * \brief USART interrupt callbacks
+ */
+struct _usart_async_callbacks {
+ void (*tx_byte_sent)(struct _usart_async_device *device);
+ void (*rx_done_cb)(struct _usart_async_device *device, uint8_t data);
+ void (*tx_done_cb)(struct _usart_async_device *device);
+ void (*error_cb)(struct _usart_async_device *device);
+};
+
+/**
+ * \brief USART descriptor device structure
+ */
+struct _usart_async_device {
+ struct _usart_async_callbacks usart_cb;
+ struct _irq_descriptor irq;
+ void * hw;
+};
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize asynchronous USART
+ *
+ * This function does low level USART configuration.
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _usart_async_init(struct _usart_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize USART
+ *
+ * This function closes the given USART by disabling its clock.
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_deinit(struct _usart_async_device *const device);
+
+/**
+ * \brief Enable usart module
+ *
+ * This function will enable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable(struct _usart_async_device *const device);
+
+/**
+ * \brief Disable usart module
+ *
+ * This function will disable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_disable(struct _usart_async_device *const device);
+
+/**
+ * \brief Calculate baud rate register value
+ *
+ * \param[in] baud Required baud rate
+ * \param[in] clock_rate clock frequency
+ * \param[in] samples The number of samples
+ * \param[in] mode USART mode
+ * \param[in] fraction A fraction value
+ *
+ * \return Calculated baud rate register value
+ */
+uint16_t _usart_async_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+ const enum usart_baud_rate_mode mode, const uint8_t fraction);
+
+/**
+ * \brief Set baud rate
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] baud_rate A baud rate to set
+ */
+void _usart_async_set_baud_rate(struct _usart_async_device *const device, const uint32_t baud_rate);
+
+/**
+ * \brief Set data order
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] order A data order to set
+ */
+void _usart_async_set_data_order(struct _usart_async_device *const device, const enum usart_data_order order);
+
+/**
+ * \brief Set mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] mode A mode to set
+ */
+void _usart_async_set_mode(struct _usart_async_device *const device, const enum usart_mode mode);
+
+/**
+ * \brief Set parity
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] parity A parity to set
+ */
+void _usart_async_set_parity(struct _usart_async_device *const device, const enum usart_parity parity);
+
+/**
+ * \brief Set stop bits mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] stop_bits A stop bits mode to set
+ */
+void _usart_async_set_stop_bits(struct _usart_async_device *const device, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set character size
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] size A character size to set
+ */
+void _usart_async_set_character_size(struct _usart_async_device *const device, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve usart status
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+uint32_t _usart_async_get_status(const struct _usart_async_device *const device);
+
+/**
+ * \brief Write a byte to the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ */
+void _usart_async_write_byte(struct _usart_async_device *const device, uint8_t data);
+
+/**
+ * \brief Check if USART is ready to send next byte
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the ready check.
+ * \retval true if the USART is ready to send next byte
+ * \retval false if the USART is not ready to send next byte
+ */
+bool _usart_async_is_byte_sent(const struct _usart_async_device *const device);
+
+/**
+ * \brief Set the state of flow control pins
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] state - A state of flow control pins to set
+ */
+void _usart_async_set_flow_control_state(struct _usart_async_device *const device,
+ const union usart_flow_control_state state);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins.
+ *
+ * \return USART_FLOW_CONTROL_STATE_UNAVAILABLE.
+ */
+union usart_flow_control_state _usart_async_get_flow_control_state(const struct _usart_async_device *const device);
+
+/**
+ * \brief Enable data register empty interrupt
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable_byte_sent_irq(struct _usart_async_device *const device);
+
+/**
+ * \brief Enable transmission complete interrupt
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable_tx_done_irq(struct _usart_async_device *const device);
+
+/**
+ * \brief Retrieve ordinal number of the given USART hardware instance
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return The ordinal number of the given USART hardware instance
+ */
+uint8_t _usart_async_get_hardware_index(const struct _usart_async_device *const device);
+
+/**
+ * \brief Enable/disable USART interrupt
+ *
+ * param[in] device The pointer to USART device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _usart_async_set_irq_state(struct _usart_async_device *const device, const enum _usart_async_callback_type type,
+ const bool state);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_USART_ASYNC_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usart_sync.h b/atmel-samd/asf4/samd21/hal/include/hpl_usart_sync.h
new file mode 100644
index 000000000..c7881583c
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usart_sync.h
@@ -0,0 +1,253 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (C) 2014 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SYNC_USART_H_INCLUDED
+#define _HPL_SYNC_USART_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART SYNC
+ *
+ * \section hpl_usart_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <hpl_usart.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART descriptor device structure
+ */
+struct _usart_sync_device {
+ void *hw;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize synchronous USART
+ *
+ * This function does low level USART configuration.
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _usart_sync_init(struct _usart_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize USART
+ *
+ * This function closes the given USART by disabling its clock.
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_deinit(struct _usart_sync_device *const device);
+
+/**
+ * \brief Enable usart module
+ *
+ * This function will enable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_enable(struct _usart_sync_device *const device);
+
+/**
+ * \brief Disable usart module
+ *
+ * This function will disable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_disable(struct _usart_sync_device *const device);
+
+/**
+ * \brief Calculate baud rate register value
+ *
+ * \param[in] baud Required baud rate
+ * \param[in] clock_rate clock frequency
+ * \param[in] samples The number of samples
+ * \param[in] mode USART mode
+ * \param[in] fraction A fraction value
+ *
+ * \return Calculated baud rate register value
+ */
+uint16_t _usart_sync_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+ const enum usart_baud_rate_mode mode, const uint8_t fraction);
+
+/**
+ * \brief Set baud rate
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] baud_rate A baud rate to set
+ */
+void _usart_sync_set_baud_rate(struct _usart_sync_device *const device, const uint32_t baud_rate);
+
+/**
+ * \brief Set data order
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] order A data order to set
+ */
+void _usart_sync_set_data_order(struct _usart_sync_device *const device, const enum usart_data_order order);
+
+/**
+ * \brief Set mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] mode A mode to set
+ */
+void _usart_sync_set_mode(struct _usart_sync_device *const device, const enum usart_mode mode);
+
+/**
+ * \brief Set parity
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] parity A parity to set
+ */
+void _usart_sync_set_parity(struct _usart_sync_device *const device, const enum usart_parity parity);
+
+/**
+ * \brief Set stop bits mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] stop_bits A stop bits mode to set
+ */
+void _usart_sync_set_stop_bits(struct _usart_sync_device *const device, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set character size
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] size A character size to set
+ */
+void _usart_sync_set_character_size(struct _usart_sync_device *const device, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve usart status
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+uint32_t _usart_sync_get_status(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Write a byte to the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ */
+void _usart_sync_write_byte(struct _usart_sync_device *const device, uint8_t data);
+
+/**
+ * \brief Read a byte from the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ *
+ * \return Data received via USART interface.
+ */
+uint8_t _usart_sync_read_byte(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Check if USART is ready to send next byte
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the ready check.
+ * \retval true if the USART is ready to send next byte
+ * \retval false if the USART is not ready to send next byte
+ */
+bool _usart_sync_is_byte_sent(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Check if there is data received by USART
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the data received check.
+ * \retval true if the USART has received a byte
+ * \retval false if the USART has not received a byte
+ */
+bool _usart_sync_is_byte_received(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Set the state of flow control pins
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] state - A state of flow control pins to set
+ */
+void _usart_sync_set_flow_control_state(struct _usart_sync_device *const device,
+ const union usart_flow_control_state state);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins.
+ *
+ * \return USART_FLOW_CONTROL_STATE_UNAVAILABLE.
+ */
+union usart_flow_control_state _usart_sync_get_flow_control_state(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Retrieve ordinal number of the given USART hardware instance
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return The ordinal number of the given USART hardware instance
+ */
+uint8_t _usart_sync_get_hardware_index(const struct _usart_sync_device *const device);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_SYNC_USART_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usb.h b/atmel-samd/asf4/samd21/hal/include/hpl_usb.h
new file mode 100644
index 000000000..d31bd9785
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usb.h
@@ -0,0 +1,281 @@
+/**
+ * \file
+ *
+ * \brief SAM USB HPL
+ *
+ * Copyright (C) 2015 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USB_H_INCLUDED
+#define _HPL_USB_H_INCLUDED
+
+#include <compiler.h>
+#include <utils.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \name USB Spec definitions */
+/*@{*/
+
+/** Return 8-bit unsigned USB data. */
+#define USB_GET_U8(addr, offset) (((uint8_t *)(addr))[(offset)])
+
+/** Return 16-bit unsigned USB data. */
+#define USB_GET_U16(addr, offset) ((((uint8_t *)(addr))[(offset) + 0] << 0) + (((uint8_t *)(addr))[(offset) + 1] << 8))
+
+/** Return 32-bit unsigned USB data. */
+#define USB_GET_U32(addr, offset) \
+ ((((uint8_t *)(addr))[(offset) + 0] << 0) + (((uint8_t *)(addr))[(offset) + 1] << 8) \
+ + (((uint8_t *)(addr))[(offset) + 2] << 16) \
+ + (((uint8_t *)(addr))[(offset) + 3] << 32))
+
+/** Offset of bmRequestType in USB request buffer. */
+#define USB_bmRequestType_Offset 0
+
+/** Offset of bRequest in USB request buffer. */
+#define USB_bRequest_Offset 1
+
+/** Offset of wValue in USB request buffer. */
+#define USB_wValue_Offset 2
+
+/** Offset of wIndex in USB request buffer. */
+#define USB_wIndex_Offset 4
+
+/** Offset of wLength in USB request buffer. */
+#define USB_wLength_Offset 6
+
+/** Get value of bmRequestType from USB request. */
+#define USB_GET_bmRequestType(req) USB_GET_U8((req), USB_bmRequestType_Offset)
+
+/** Get value of bRequest from USB request. */
+#define USB_GET_bRequest(req) USB_GET_U8((req), USB_bRequest_Offset)
+
+/** Get value of wValue from USB request. */
+#define USB_GET_wValue(req) USB_GET_U16((req), USB_wValue_Offset)
+
+/** Get value of wIndex from USB request. */
+#define USB_GET_wIndex(req) USB_GET_U16((req), USB_wIndex_Offset)
+
+/** Get value of wLength from USB request. */
+#define USB_GET_wLength(req) USB_GET_U16((req), USB_wLength_Offset)
+
+/** USB request IN indication of bmRequestType. */
+#define USB_REQ_TYPE_IN 0x80u
+
+/** USB endpoint number mask of bEndpointAddress. */
+#define USB_EP_N_MASK 0x0Fu
+
+/** USB endpoint direction bit of bEndpointAddress. */
+#define USB_EP_DIR 0x80u
+
+/** Get USB endpoint direction from endpoint address. */
+#define USB_EP_GET_DIR(ep_addr) ((ep_addr)&USB_EP_DIR)
+
+/** Get USB endpoint number from endpoint address. */
+#define USB_EP_GET_N(ep_addr) ((ep_addr)&USB_EP_N_MASK)
+
+/** Transfer type in EP descriptor bmAttributes: Control. */
+#define USB_EP_XTYPE_CTRL 0x0
+
+/** Transfer type in EP descriptor bmAttributes: Isochronous. */
+#define USB_EP_XTYPE_ISOCH 0x1
+
+/** Transfer type in EP descriptor bmAttributes: Bulk. */
+#define USB_EP_XTYPE_BULK 0x2
+
+/** Transfer type in EP descriptor bmAttributes: Interrupt. */
+#define USB_EP_XTYPE_INTERRUPT 0x3
+
+/** Transfer type mask in EP descriptor bmAttributes. */
+#define USB_EP_XTYPE_MASK 0x3u
+
+/*@}*/
+
+/** \name USB status codes
+ *@{
+ */
+/** USB operation is done successfully. */
+#define USB_OK 0
+/** USB (endpoint) is busy. */
+#define USB_BUSY 1
+/** USB (endpoint) is halted. */
+#define USB_HALTED 2
+
+/** General error. */
+#define USB_ERROR 0x10
+/** Operation is denied by hardware (e.g., syncing). */
+#define USB_ERR_DENIED 0x11
+/** Input parameter error. */
+#define USB_ERR_PARAM 0x12
+/** Functionality is not supported (e.g., initialize endpoint without cache to be control). */
+#define USB_ERR_FUNC 0x13
+/** Re-initialize, re-enable ... */
+#define USB_ERR_REDO 0x14
+/** Not enough resource (memory, endpoints ...). */
+#define USB_ERR_ALLOC_FAIL 0x15
+/*@}*/
+
+/** USB speed. */
+enum usb_speed {
+ /** USB Low Speed. */
+ USB_SPEED_LS,
+ /** USB Full Speed. */
+ USB_SPEED_FS,
+ /** USB High Speed. */
+ USB_SPEED_HS,
+ /** USB Super Speed. */
+ USB_SPEED_SS
+};
+
+/** USB transaction type. */
+enum usb_trans_type {
+ /** USB SETUP transaction. */
+ USB_TRANS_SETUP,
+ /** USB IN transaction. */
+ USB_TRANS_IN,
+ /** USB OUT transaction. */
+ USB_TRANS_OUT
+};
+
+/** USB events that generates the device callbacks. */
+enum usb_event {
+ /** USB VBus changed, with parameter as present/not present. */
+ USB_EV_VBUS,
+ /** USB RESET detected on bus. */
+ USB_EV_RESET,
+ /** USB wakeup. */
+ USB_EV_WAKEUP,
+ /** USB LPM suspend, with parameter as \ref usb_lpm_attributes. */
+ USB_EV_LPM_SUSPEND,
+ /** USB suspend. */
+ USB_EV_SUSPEND,
+ /** USB error, with parameter as error code. */
+ USB_EV_ERROR,
+ /** Number of USB event types. */
+ USB_EV_N
+};
+
+/** Control action for USB device endpoint stall. */
+enum usb_ep_stall_ctrl {
+ /** Clear stall of the endpoint. */
+ USB_EP_STALL_CLR,
+ /** Stall the endpoint. */
+ USB_EP_STALL_SET,
+ /** Return the stall status. */
+ USB_EP_STALL_GET
+};
+
+/** Control action for USB device endpoint halt. */
+enum usb_ep_halt_ctrl {
+ /** Clear halt of the endpoint. */
+ USB_EP_HALT_CLR = USB_EP_STALL_CLR,
+ /** Stall the endpoint. */
+ USB_EP_HALT_SET = USB_EP_STALL_SET,
+ /** Return the halt status. */
+ USB_EP_HALT_GET = USB_EP_STALL_GET
+};
+
+/** USB transactions status codes. */
+enum usb_trans_code {
+ /** TX or RX has been done without error. */
+ USB_TRANS_DONE,
+ /** The endpoint is stalled. */
+ USB_TRANS_STALL,
+ /** The endpoint transactions are aborted (cancel, control setup/status). */
+ USB_TRANS_ABORT,
+ /** The endpoint transactions are aborted by reset/disable. */
+ USB_TRANS_RESET,
+ /** Error is reported on the endpoint. */
+ USB_TRANS_ERROR
+};
+
+/** Transfer status codes. */
+enum usb_xfer_code {
+ /** Transfer is done without error, for ctrl it means status packet done. */
+ USB_XFER_DONE,
+ /** For control transfer only, data stage is done without error. */
+ USB_XFER_DATA,
+ /** Endpoint stall is set. */
+ USB_XFER_HALT,
+ /** Endpoint stall is cleared. */
+ USB_XFER_UNHALT,
+ /** Transfer is aborted. */
+ USB_XFER_ABORT,
+ /** Transfer is aborted because endpoint reset/disable. */
+ USB_XFER_RESET,
+ /** There was an error. */
+ USB_XFER_ERROR
+};
+
+/** USB endpoint errors. */
+enum usb_ep_error {
+ /** No error. */
+ USB_EP_NO_ERROR,
+ /** CRC error. */
+ USB_EP_ERR_CRC,
+ /** Endpoint transfer overflow. */
+ USB_EP_ERR_OVERFLOW,
+ /** Other endpoint errors. */
+ USB_EP_ERR_GENERAL
+};
+
+/** Endpoint transfer state. */
+enum usb_ep_state {
+ /** Endpoint is disabled. */
+ USB_EP_S_DISABLED,
+ /** Endpoint is not busy. */
+ USB_EP_S_IDLE,
+ /** Control transfer only, endpoint is transferring setup packet. */
+ USB_EP_S_X_SETUP,
+ /** Endpoint is transferring data. */
+ USB_EP_S_X_DATA,
+ /** Control transfer only, endpoint is in status stage. */
+ USB_EP_S_X_STATUS,
+ /** Endpoint is halted. */
+ USB_EP_S_HALTED,
+ /** Endpoint error. */
+ USB_EP_S_ERROR
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_USB_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usb_device.h b/atmel-samd/asf4/samd21/hal/include/hpl_usb_device.h
new file mode 100644
index 000000000..640833f45
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usb_device.h
@@ -0,0 +1,387 @@
+/**
+ * \file
+ *
+ * \brief SAM USB HPL
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USB_DEVICE_H_INCLUDED
+#define _HPL_USB_DEVICE_H_INCLUDED
+
+#include <hpl_usb.h>
+#include "hpl_usb_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** USB Device callback type. */
+enum usb_d_cb_type {
+ /** USB device SOF callback. */
+ USB_D_CB_SOF,
+ /** USB device events callbacks. */
+ USB_D_CB_EVENT,
+ /** Number of types of USB device callback types. */
+ USB_D_CB_N
+};
+
+/** USB Device endpoint callback type. */
+enum usb_d_ep_cb_type {
+ /** USB device endpoint setup callback. */
+ USB_D_EP_CB_SETUP,
+ /** USB device endpoint more data callback. */
+ USB_D_EP_CB_MORE,
+ /** USB device endpoint transaction done or error callback. */
+ USB_D_EP_CB_XFER,
+ /** Number of types of USB device endpoint callback types. */
+ USB_D_EP_CB_N
+};
+
+/** Control action for USB device LPM handshake. */
+enum usb_d_lpm_ctrl {
+ /** No LPM handshake, not supported. */
+ USB_D_LPM_DISABLE,
+ /** ACK the LPM transaction. */
+ USB_D_LPM_ACK,
+ /** NYET the LPM transaction. */
+ USB_D_LPM_NYET
+};
+
+/**
+ * USB device transfer descriptor.
+ */
+struct usb_d_transfer {
+ /** Pointer to data buffer to transfer.
+ * Note that it's recommended that the buffer is 32-bit aligned since
+ * some of USB peripheral require this.
+ */
+ uint8_t *buf;
+ /** Transfer size, in number of bytes.
+ * Note that it's recommended that the buffer size is 32-bit aligned
+ * (modeled by 4) since some of USB peripheral require this.
+ */
+ uint32_t size;
+ /** Endpoint address. */
+ uint8_t ep;
+ /** Append ZLP for IN transfer, wait ZLP for OUT transfer. */
+ uint8_t zlp;
+};
+
+/** USB device transactions status structure. */
+struct usb_d_trans_status {
+ /** Total data size. */
+ uint32_t size;
+ /** Total transfered data count. */
+ uint32_t count;
+ /** Endpoint address. */
+ uint8_t ep;
+ /** Endpoint type - CTRL/ISO/INT/BULK. */
+ uint8_t xtype : 2;
+ /** Transactions state, busy or not. */
+ uint8_t busy : 1;
+ /** Transactions state, setup received or not. */
+ uint8_t setup : 1;
+ /** Transactions state, stall or not. */
+ uint8_t stall : 1;
+ /** Transactions direction. */
+ uint8_t dir : 1;
+};
+
+/** Prototype function for callback that is invoked on USB device SOF. */
+typedef void (*_usb_d_dev_sof_cb_t)(void);
+
+/** Prototype function for callback that is invoked on USB device events. */
+typedef void (*_usb_d_dev_event_cb_t)(const enum usb_event, const uint32_t param);
+
+/** HPL USB device callbacks. */
+struct _usb_d_dev_callbacks {
+ /** Callback that is invoked on SOF. */
+ _usb_d_dev_sof_cb_t sof;
+ /** Callback that is invoked on USB RESET/WAKEUP/RESUME/SUSPEND. */
+ _usb_d_dev_event_cb_t event;
+};
+
+/** USB device endpoint callbacks. */
+enum usb_d_dev_ep_cb_type {
+ /** Setup packet is received. */
+ USB_D_DEV_EP_CB_SETUP,
+ /** Try to require more data. */
+ USB_D_DEV_EP_CB_MORE,
+ /** Transaction done OK/ERROR. */
+ USB_D_DEV_EP_CB_DONE,
+ /** Number of device endpoint callbacks. */
+ USB_D_DEV_EP_CB_N
+};
+
+/**
+ * Callback that is invoked when control SETUP packet has bee received.
+ * \ref _usb_d_dev_ep_read_req() must be invoked to read setup data, and allow
+ * IN/OUT transactions on control endpoint.
+ */
+typedef void (*_usb_d_dev_ep_cb_setup_t)(const uint8_t ep);
+
+/** Callback that is invoked when buffer is done, but last packet is full size
+ * packet without ZLP. Return \c true if more data has been requested. */
+typedef bool (*_usb_d_dev_ep_cb_more_t)(const uint8_t ep, const uint32_t transfered);
+
+/** Callback that is invoked when all data is finished, including background
+ * transfer, or error happens. */
+typedef void (*_usb_d_dev_ep_cb_done_t)(const uint8_t ep, const int32_t code, const uint32_t transfered);
+
+/** Callbacks for HPL USB device endpoint. */
+struct _usb_d_dev_ep_callbacks {
+ /** Callback that is invoked when SETUP packet is received.
+ * \ref _usb_d_dev_ep_read_req() must be invoked to read setup data, and
+ * allow IN/OUT transactions on control endpoint.
+ */
+ _usb_d_dev_ep_cb_setup_t setup;
+ /** Callback that is invoked to check if buffer is NULL and more data is
+ * required.
+ * It's called when last packet is full size packet, without
+ * auto ZLP enabled.
+ * It could be called when background transfer is still in progress.
+ */
+ _usb_d_dev_ep_cb_more_t more;
+ /** Callback that is invoked when transaction is done, including background
+ * transfer, or error occurs.
+ */
+ _usb_d_dev_ep_cb_done_t done;
+};
+
+/**
+ * \brief Initialize the USB device instance
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_init(void);
+
+/**
+ * \brief Deinitialize the USB device instance
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+void _usb_d_dev_deinit(void);
+
+/**
+ * \brief Register callback to handle USB device events
+ * \param[in] type Callback type. See \ref usb_d_cb_type.
+ * \param[in] func Pointer to callback function.
+ * Refer to \ref _usb_d_dev_callbacks for the prototypes.
+ */
+void _usb_d_dev_register_callback(const enum usb_d_cb_type type, const FUNC_PTR func);
+
+/**
+ * \brief Register callback to handle USB device endpoint events
+ * \param[in] type Callback type. See \ref usb_d_dev_ep_cb_type.
+ * \param[in] func Pointer to callback function.
+ * Refer to \ref _usb_d_dev_ep_callbacks for the prototypes.
+ */
+void _usb_d_dev_register_ep_callback(const enum usb_d_dev_ep_cb_type type, const FUNC_PTR func);
+
+/**
+ * \brief Enable the USB device
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_enable(void);
+
+/**
+ * \brief Disable the USB device
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_disable(void);
+
+/**
+ * \brief Attach the USB device
+ */
+void _usb_d_dev_attach(void);
+
+/**
+ * \brief Detach the USB device
+ */
+void _usb_d_dev_detach(void);
+
+/**
+ * \brief Send the USB device remote wakeup to host
+ */
+void _usb_d_dev_send_remotewakeup(void);
+
+/**
+ * \brief Get the USB device working speed
+ * \return USB speed. See \ref usb_speed.
+ */
+enum usb_speed _usb_d_dev_get_speed(void);
+
+/**
+ * \brief Set the USB device address
+ * \param[in] addr Address to be used.
+ */
+void _usb_d_dev_set_address(const uint8_t addr);
+
+/**
+ * \brief Get the USB device address
+ * \return Address that is used.
+ */
+uint8_t _usb_d_dev_get_address(void);
+
+/**
+ * \brief Get the USB device frame number
+ * \return The frame number.
+ */
+uint16_t _usb_d_dev_get_frame_n(void);
+
+/**
+ * \brief Get the USB device micro frame number
+ * \return The micro frame number inside one frame (0~7).
+ */
+uint8_t _usb_d_dev_get_uframe_n(void);
+
+/**
+ * \brief Initialize and enable the USB device default endpoint 0
+ * \param[in] max_pkt_siz Max endpoint size.
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_ep0_init(const uint8_t max_pkt_siz);
+
+/**
+ * \brief Initialize and enable the USB device endpoint
+ * \param[in] ep Endpoint address,
+ * see endpoint descriptor details in USB spec.
+ * \param[in] attr Endpoint attributes,
+ * see endpoint descriptor details in USB spec.
+ * \param[in] max_pkt_siz Endpoint size,
+ * see endpoint descriptor details in USB spec.
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_ep_init(const uint8_t ep, const uint8_t attr, uint16_t max_pkt_siz);
+
+/**
+ * \brief Disable and deinitialize the USB device endpoint
+
+ * \param[in] ep The endpoint to deinitialize.
+ */
+void _usb_d_dev_ep_deinit(const uint8_t ep);
+
+/**
+ * \brief Enable the endpoint
+ * \param[in] ep The endpoint to enable.
+ * \return Operation result status.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_ep_enable(const uint8_t ep);
+
+/**
+ * \brief Disable the endpoint
+ * \param[in] ep The endpoint to disable.
+ */
+void _usb_d_dev_ep_disable(const uint8_t ep);
+
+/**
+ * \brief Set/Clear/Get USB device endpoint stall status
+ * \param[in] ep Endpoint address.
+ * \param[in] ctrl Operation selector. See \ref usb_ep_stall_ctrl.
+ * \return Operation result or stall status.
+ * \retval 0 Success or not stall.
+ * \retval 1 Endpoint is stalled.
+ * \retval -1 error.
+ */
+int32_t _usb_d_dev_ep_stall(const uint8_t ep, const enum usb_ep_stall_ctrl ctrl);
+
+/**
+ * \brief Read setup request data from specific endpoint
+ * \param[in] ep Endpoint address.
+ * \param[out] req_buf Pointer to buffer to locate the setup packet.
+ * \return Number of bytes or error code.
+ * \retval <0 error code.
+ * \retval 0 No setup packet ready for read.
+ * \retval >0 Size of bytes read, and ready to start IN/OUT. Note that if
+ * this number is over 8, only first 8 bytes will be copied.
+ */
+int32_t _usb_d_dev_ep_read_req(const uint8_t ep, uint8_t *req_buf);
+
+/**
+ * \brief Start USB device transfer
+ *
+ * On different USB peripheral hardware the transaction buffer address and size
+ * may have different constraints. E.g., some hardware may require input address
+ * 32-bit aligned, and input size 32-bit aligned. Refer to the corresponding
+ * hardware usage reference documents.
+ * The constraints are checked in implementation, with error code returned.
+ *
+ * \param[in] trans Pointer to the transaction description.
+ * \return Operation result status.
+ * \retval 1 Busy.
+ * \retval 0 Success.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_ep_trans(const struct usb_d_transfer *trans);
+
+/**
+ * \brief Abort pending USB device transaction on specific endpoint
+ * \param[in] ep Endpoint address to abort.
+ */
+void _usb_d_dev_ep_abort(const uint8_t ep);
+
+/**
+ * \brief Retrieve endpoint status.
+ * \param[in] ep Endpoint address.
+ * \param[out] stat Pointer to buffer to fill status description.
+ * \return Status.
+ * \retval 2 Packet writing.
+ * \retval 1 Busy.
+ * \retval 0 Ready.
+ * \retval <0 Error code.
+ */
+int32_t _usb_d_dev_ep_get_status(const uint8_t ep, struct usb_d_trans_status *stat);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_USB_DEVICE_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_usb_host.h b/atmel-samd/asf4/samd21/hal/include/hpl_usb_host.h
new file mode 100644
index 000000000..ee48ecc3a
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_usb_host.h
@@ -0,0 +1,628 @@
+/**
+ * \file
+ *
+ * \brief SAM USB host HPL
+ *
+ * Copyright (C) 2016 - 2017 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USB_HOST_H_INCLUDED
+#define _HPL_USB_HOST_H_INCLUDED
+
+#include <hpl_usb.h>
+#include <hpl_irq.h>
+#include "hpl_usb_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Driver version */
+#define USB_H_VERSION 0x00000001
+
+/**
+ * @brief USB HCD callback types
+ */
+enum usb_h_cb_type {
+ /** SOF generated */
+ USB_H_CB_SOF,
+ /** Root Hub change detected */
+ USB_H_CB_ROOTHUB_CHANGE,
+ /** Number of USB HCD callback types */
+ USB_H_CB_N
+};
+
+/**
+ * @brief USB HCD resource strategy
+ */
+enum usb_h_rsc_strategy {
+ /** Normal resource allocation, e.g.,
+ * 1 bank for interrupt endpoint,
+ * 2 bank for bulk endpoint and normal iso endpoint,
+ * 3 bank for iso high bandwidth endpoint.
+ */
+ USB_H_RSC_NORMAL = false,
+ /** Minimal resource allocation, e.g., only 1 bank for bulk endpoints */
+ USB_H_RSC_MINIMAL = true
+};
+
+/**
+ * @brief USB HCD pipe states
+ */
+enum usb_h_pipe_state {
+ /** Pipe is free to allocate */
+ USB_H_PIPE_S_FREE = 0x00,
+ /** Pipe is in configuration */
+ USB_H_PIPE_S_CFG = 0x01,
+ /** Pipe is allocated and idle */
+ USB_H_PIPE_S_IDLE = 0x02,
+ /** Pipe in control setup stage */
+ USB_H_PIPE_S_SETUP = 0x03,
+ /** Pipe in data IN stage */
+ USB_H_PIPE_S_DATI = 0x05,
+ /** Pipe in data OUT stage */
+ USB_H_PIPE_S_DATO = 0x06,
+ /** Pipe in data IN ZLP stage */
+ USB_H_PIPE_S_ZLPI = 0x07,
+ /** Pipe in data OUT ZLP stage */
+ USB_H_PIPE_S_ZLPO = 0x08,
+ /** Pipe in control status IN stage */
+ USB_H_PIPE_S_STATI = 0x09,
+ /** Pipe in control status OUT stage */
+ USB_H_PIPE_S_STATO = 0x0A,
+ /** Taken by physical pipe (in process) */
+ USB_H_PIPE_S_TAKEN = 0x10
+};
+
+/**
+ * @brief USB HCD status code
+ */
+enum usb_h_status {
+ /** OK */
+ USB_H_OK = ERR_NONE,
+ /** Busy */
+ USB_H_BUSY = ERR_BUSY,
+ /** Denied */
+ USB_H_DENIED = ERR_DENIED,
+ /** Timeout */
+ USB_H_TIMEOUT = ERR_TIMEOUT,
+ /** Abort */
+ USB_H_ABORT = ERR_ABORTED,
+ /** Stall protocol */
+ USB_H_STALL = ERR_PROTOCOL,
+ /** Transfer reset by pipe re-configure */
+ USB_H_RESET = ERR_REQ_FLUSHED,
+ /** Argument error */
+ USB_H_ERR_ARG = ERR_INVALID_ARG,
+ /** Operation not supported */
+ USB_H_ERR_UNSP_OP = ERR_UNSUPPORTED_OP,
+ /** No resource */
+ USB_H_ERR_NO_RSC = ERR_NO_RESOURCE,
+ /** Not initialized */
+ USB_H_ERR_NOT_INIT = ERR_NOT_INITIALIZED,
+ /** Some general error */
+ USB_H_ERR = ERR_IO
+};
+
+/** Forward declare for pipe structure */
+struct usb_h_pipe;
+
+/** Forward declare for driver descriptor structure */
+struct usb_h_desc;
+
+/**
+ * \brief Prototyping USB HCD callback of SOF
+ */
+typedef void (*usb_h_cb_sof_t)(struct usb_h_desc *drv);
+
+/**
+ * \brief Prototyping USB HCD callback of root hub changing.
+ * According to the bitmap size, max port number is 31.
+ */
+typedef void (*usb_h_cb_roothub_t)(struct usb_h_desc *drv, uint8_t port, uint8_t ftr);
+
+/**
+ * Prototyping USB HCD callback of pipe transfer done.
+ * For control pipe, it's forced to call even if there is no transfer
+ * in progress, since the pipe size could be changed at run time.
+ */
+typedef void (*usb_h_pipe_cb_xfer_t)(struct usb_h_pipe *pipe);
+
+/** Access to max packet size of a pipe */
+#define usb_h_pipe_max_pkt_size(p) (p->max_pkt_size)
+
+/** Access to device address of a pipe */
+#define usb_h_pipe_dev_addr(p) (p->dev)
+
+/** Access to endpoint address of a pipe */
+#define usb_h_pipe_ep_addr(p) (p->ep)
+
+/** Access to state of a pipe */
+#define usb_h_pipe_state(p) (p->x.general.state)
+
+/** Access to status of a pipe */
+#define usb_h_pipe_status(p) (p->x.general.status)
+
+/**
+ * @brief USB Host Controller device structure
+ */
+struct usb_h_desc {
+ /** Pointer to hardware base */
+ void *hw;
+ /** Pointer to private data for Host Controller driver */
+ void *prvt;
+ /** Interrupt handling descriptor */
+ struct _irq_descriptor irq;
+ /** Callback of SOF */
+ usb_h_cb_sof_t sof_cb;
+ /** Callback of root hub change */
+ usb_h_cb_roothub_t rh_cb;
+#if CONF_USB_H_INST_OWNER_SP
+ /** Extension for the driver owner (upper layer user) */
+ void *owner;
+#endif
+};
+
+/**
+ * @brief Transfer descriptor for control transfer
+ *
+ * Timing in USB 2.0 spec.:
+ * - 9.2.6.1 : USB sets an upper limit of 5 seconds as the upper limit for any
+ * command to be processed.
+ * - 9.2.6.3 : if a device receives a SetAddress() request, the device must be
+ * able to complete processing of the request and be able to
+ * successfully complete the Status stage of the request within
+ * 50 ms.
+ * After successful completion of the Status stage, the device is
+ * allowed a SetAddress() recovery interval of 2 ms. At the end of
+ * this interval, the device must be able to accept Setup packets
+ * addressed to the new address.
+ * - 9.2.6.4 : For standard device requests that require no Data stage, a device
+ * must be able to complete the request and be able to successfully
+ * complete the Status stage of the request within 50 ms of receipt
+ * of the request. This limitation applies to requests to the
+ * device, interface, or endpoint.
+ * For standard device requests that require data stage transfer to
+ * the host, the device must be able to return the first data packet
+ * to the host within 500 ms of receipt of the request. For
+ * subsequent data packets, if any, the device must be able to
+ * return them within 500 ms of successful completion of the
+ * transmission of the previous packet. The device must then be
+ * able to successfully complete the status stage within 50 ms after
+ * returning the last data packet.
+ * For standard device requests that require a data stage transfer
+ * to the device, the 5-second limit applies.
+ * - 9.2.6.5 : Unless specifically exempted in the class document, all
+ * class-specific requests must meet the timing limitations for
+ * standard device requests.
+ *
+ * Conclusion:
+ * 1. Whole request with data: 5 seconds
+ * 2. Whole request without data: 50 ms
+ * 3. Data packets: 500 ms
+ */
+struct usb_h_ctrl_xfer {
+ /** Pointer to transfer data */
+ uint8_t *data;
+ /** Pointer to setup packet */
+ uint8_t *setup;
+ /** Expected transfer size */
+ uint16_t size;
+ /** Transfer count */
+ uint16_t count;
+ /** Timeout for request, -1 if disable timeout */
+ int16_t req_timeout;
+ /** Timeout between packets
+ * (500ms for data and 50ms for status), -1 if disabled */
+ int16_t pkt_timeout;
+ /** Packet size during transfer (<= allocate max packet size) */
+ uint16_t pkt_size;
+
+ /** Transfer state */
+ uint8_t state;
+ /** Last transfer status */
+ int8_t status;
+};
+
+/**
+ * @brief Transfer descriptor for bulk / interrupt / iso transfer
+ */
+struct usb_h_bulk_int_iso_xfer {
+ /** Expected transfer size */
+ uint32_t size;
+ /** Transfer count */
+ uint32_t count;
+ /** Pointer to transfer data */
+ uint8_t *data;
+ /** Reserved */
+ uint16_t reserved[3];
+
+ /** Transfer state */
+ uint8_t state;
+ /** Last transfer status */
+ int8_t status;
+};
+
+/**
+ * @brief Transfer descriptor for periodic high bandwidth transfer
+ */
+struct usb_h_high_bw_xfer {
+ /** Expected transfer size */
+ uint32_t size;
+ /** Transfer count */
+ uint32_t count;
+ /** Pointer to transfer data */
+ uint8_t *data;
+ /** Micro frame packet sizes */
+ uint16_t pkt_size[3];
+
+ /** Transfer state */
+ uint8_t state;
+ /** Last transfer status */
+ int8_t status;
+};
+
+/**
+ * @brief General transfer descriptor
+ */
+struct usb_h_xfer {
+ /** Reserved for different transfer */
+ union {
+ uint16_t u16[9];
+ uint8_t u8[18];
+ } reserved;
+ /** Transfer state */
+ uint8_t state;
+ /** Last transfer status */
+ int8_t status;
+};
+
+/**
+ * @brief USB Host Controller Driver Pipe structure
+ */
+struct usb_h_pipe {
+ /** Pointer to the USB Host Controller Driver */
+ struct usb_h_desc *hcd;
+ /** Pointer to the callback for transfer done */
+ usb_h_pipe_cb_xfer_t done;
+#if CONF_USB_H_INST_OWNER_SP
+ /** Pointer to the pipe owner */
+ void *owner;
+#endif
+
+ /** Endpoint max packet size (bits 10..0) */
+ uint16_t max_pkt_size;
+ /** Device address */
+ uint8_t dev;
+ /** Endpoint address */
+ uint8_t ep;
+
+ /** Endpoint interval */
+ uint8_t interval;
+ /** Endpoint type: Control, Isochronous, Bulk or Interrupt */
+ uint8_t type;
+ /** Current toggle (driver dependent) */
+ uint8_t toggle;
+ /** Endpoint number of banks (HW dependent) */
+ uint8_t bank : 2;
+ /** Transfer speed (HW dependent) */
+ uint8_t speed : 2;
+ /** High bandwidth periodic out */
+ uint8_t high_bw_out : 1;
+ /** Uses DMA (on transfer) */
+ uint8_t dma : 1;
+ /** Transfer ZLP support */
+ uint8_t zlp : 1;
+ /** Transfer periodic */
+ uint8_t periodic_start : 1;
+
+ /** Transfer status */
+ union {
+ /** General transfer info */
+ struct usb_h_xfer general;
+ /** Control transfer status */
+ struct usb_h_ctrl_xfer ctrl;
+ /** Bulk interrupt iso transfer status */
+ struct usb_h_bulk_int_iso_xfer bii;
+ /** Periodic high bandwidth transfer status */
+ struct usb_h_high_bw_xfer hbw;
+ } x;
+};
+
+/**
+ * @brief USB HCD Initialization
+ *
+ * @param drv Pointer to the HCD driver instance
+ * @param[in] hw Pointer to hardware base
+ * @param[in] prvt The private driver data (implement specific)
+ *
+ * @return Operation result status
+ * @retval ERR_DENIED Hardware has been enabled
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_init(struct usb_h_desc *drv, void *hw, void *prvt);
+
+/**
+ * @brief USB HCD de-initialization
+ *
+ * @param drv The driver
+ */
+void _usb_h_deinit(struct usb_h_desc *drv);
+
+/**
+ * @brief USB HCD enable
+ *
+ * @param drv The driver
+ */
+void _usb_h_enable(struct usb_h_desc *drv);
+
+/**
+ * @brief USB HCD disable
+ *
+ * @param drv The driver
+ */
+void _usb_h_disable(struct usb_h_desc *drv);
+
+/**
+ * @brief Register callbacks for USB HCD
+ *
+ * @param drv The driver
+ * @param[in] type The callback type
+ * @param[in] cb The callback function entry
+ *
+ * @return Operation result status
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_register_callback(struct usb_h_desc *drv, enum usb_h_cb_type type, FUNC_PTR cb);
+
+/**
+ * @brief Return current frame number
+ *
+ * @param drv The driver
+ *
+ * @return current frame number
+ */
+uint16_t _usb_h_get_frame_n(struct usb_h_desc *drv);
+
+/**
+ * @brief Return current micro frame number
+ *
+ * @param drv The driver
+ *
+ * @return current micro frame number
+ */
+uint8_t _usb_h_get_microframe_n(struct usb_h_desc *drv);
+
+/**
+ * @brief Suspend the USB bus
+ *
+ * @param drv The driver
+ */
+void _usb_h_suspend(struct usb_h_desc *drv);
+
+/**
+ * @brief Resume the USB bus
+ *
+ * @param drv The driver
+ */
+void _usb_h_resume(struct usb_h_desc *drv);
+
+/* Root hub related APIs */
+
+/**
+ * \brief Reset the root hub port
+ *
+ * \param[in,out] drv Pointer to the USB HCD driver
+ * \param[in] port Root hub port, ignored if there is only one port
+ */
+void _usb_h_rh_reset(struct usb_h_desc *drv, uint8_t port);
+
+/**
+ * \brief Suspend the root hub port
+ *
+ * \param[in,out] drv Pointer to the USB HCD driver
+ * \param[in] port Root hub port, ignored if there is only one port
+ */
+void _usb_h_rh_suspend(struct usb_h_desc *drv, uint8_t port);
+
+/**
+ * \brief Resume the root hub port
+ *
+ * \param[in,out] drv Pointer to the USB HCD driver
+ * \param[in] port Root hub port, ignored if there is only one port
+ */
+void _usb_h_rh_resume(struct usb_h_desc *drv, uint8_t port);
+
+/**
+ * \brief Root hub or port feature status check
+ *
+ * Check USB Spec. for hub status and feature selectors.
+ *
+ * \param[in] drv Pointer to the USB HCD driver
+ * \param[in] port Set to 0 to get hub status, otherwise to get port status
+ * \param[in] ftr Hub feature/status selector
+ * (0: connection, 2: suspend, 4: reset, 9: LS, 10: HS)
+ *
+ * \return \c true if the status bit is 1
+ */
+bool _usb_h_rh_check_status(struct usb_h_desc *drv, uint8_t port, uint8_t ftr);
+
+/* Pipe transfer functions */
+
+/**
+ * @brief Allocate a pipe for USB host communication
+ *
+ * @param drv The USB HCD driver
+ * @param[in] dev The device address
+ * @param[in] ep The endpoint address
+ * @param[in] max_pkt_size The endpoint maximum packet size
+ * @param[in] attr The endpoint attribute
+ * @param[in] interval The endpoint interval
+ * (bInterval of USB Endpoint Descriptor)
+ * @param[in] speed The transfer speed of the endpoint
+ * @param[in] minimum_rsc Minimum the resource usage, \sa usb_h_rsc_strategy
+ *
+ * @return Pointer to allocated pipe structure instance
+ * @retval NULL allocation fail
+ */
+struct usb_h_pipe *_usb_h_pipe_allocate(struct usb_h_desc *drv, uint8_t dev, uint8_t ep, uint16_t max_pkt_size,
+ uint8_t attr, uint8_t interval, uint8_t speed, bool minimum_rsc);
+
+/**
+ * @brief Free an allocated pipe
+ *
+ * @param pipe The pipe
+ *
+ * @return Operation result status
+ * @retval ERR_BUSY Pipe is busy, use \ref _usb_h_pipe_abort to abort
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_pipe_free(struct usb_h_pipe *pipe);
+
+/**
+ * @brief Modify parameters of an allocated control pipe
+ *
+ * @param pipe The pipe
+ * @param[in] dev The device address
+ * @param[in] ep The endpoint address
+ * @param[in] max_pkt_size The maximum packet size, must be equal or
+ * less than allocated size
+ * @param[in] speed The working speed
+ *
+ * @return Operation result status
+ * @retval ERR_NOT_INITIALIZED Pipe is not allocated
+ * @retval ERR_BUSY Pipe is busy transferring
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_UNSUPPORTED_OP Pipe is not control pipe
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_pipe_set_control_param(struct usb_h_pipe *pipe, uint8_t dev, uint8_t ep, uint16_t max_pkt_size,
+ uint8_t speed);
+
+/**
+ * @brief Register transfer callback on a pipe
+ *
+ * @param pipe The pipe
+ * @param[in] cb Transfer callback function
+ *
+ * @return Operation result status
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_pipe_register_callback(struct usb_h_pipe *pipe, usb_h_pipe_cb_xfer_t cb);
+
+/**
+ * @brief Issue a control transfer (request) on a pipe
+ *
+ * \note When there is data stage, timeout between data packets is 500ms, the
+ * timeout between last data packet and the status packet is 50ms.
+ *
+ * @param pipe The pipe
+ * @param[in] setup Pointer to the setup packet
+ * @param[in,out] data Pointer to the data buffer
+ * @param[in] length The data length
+ * @param[in] timeout Timeout for whole request in ms
+ *
+ * @return Operation result status
+ * @retval ERR_NOT_INITIALIZED Pipe is not allocated
+ * @retval ERR_BUSY Pipe is busy transferring
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_UNSUPPORTED_OP Pipe is not control pipe
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_control_xfer(struct usb_h_pipe *pipe, uint8_t *setup, uint8_t *data, uint16_t length, int16_t timeout);
+
+/**
+ * @brief Issue a bulk / interrupt / iso transfer on a pipe
+ *
+ * @param pipe The pipe
+ * @param[in,out] data Pointer to the data buffer
+ * @param[in] length The data length
+ * @param[in] auto_zlp Auto append ZLP for OUT
+ *
+ * @return Operation result status
+ * @retval ERR_NOT_INITIALIZED Pipe is not allocated
+ * @retval ERR_BUSY Pipe is busy transferring
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_UNSUPPORTED_OP Pipe is control pipe
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_bulk_int_iso_xfer(struct usb_h_pipe *pipe, uint8_t *data, uint32_t length, bool auto_zlp);
+
+/**
+ * @brief Issue a periodic high bandwidth output on a pipe
+ *
+ * @param pipe The pipe
+ * @param[in,out] data Pointer to the data buffer
+ * @param[in] length The data length
+ * @param[in] trans_pkt_size The transaction packet sizes in a micro frame,
+ * 0 to use endpoint max packet size
+ *
+ * @return Operation result status
+ * @retval ERR_NOT_INITIALIZED Pipe is not allocated
+ * @retval ERR_BUSY Pipe is busy transferring
+ * @retval ERR_INVALID_ARG Argument error
+ * @retval ERR_UNSUPPORTED_OP Pipe is not high bandwidth periodic pipe, or
+ * DMA feature not enabled, or
+ * high bandwidth not enabled
+ * @retval ERR_NONE Operation done successfully
+ */
+int32_t _usb_h_high_bw_out(struct usb_h_pipe *pipe, uint8_t *data, uint32_t length, uint16_t trans_pkt_size[3]);
+
+/**
+ * @brief Check if pipe is busy transferring
+ *
+ * @param pipe The pipe
+ *
+ * @return \c true if pipe is busy
+ */
+bool _usb_h_pipe_is_busy(struct usb_h_pipe *pipe);
+
+/**
+ * @brief Abort pending transfer on a pipe
+ *
+ * @param pipe The pipe
+ */
+void _usb_h_pipe_abort(struct usb_h_pipe *pipe);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_USB_HOST_H_INCLUDED */
diff --git a/atmel-samd/asf4/samd21/hal/include/hpl_user_area.h b/atmel-samd/asf4/samd21/hal/include/hpl_user_area.h
new file mode 100644
index 000000000..b5c419bff
--- /dev/null
+++ b/atmel-samd/asf4/samd21/hal/include/hpl_user_area.h
@@ -0,0 +1,133 @@
+/**
+ * \file
+ *
+ * \brief Special user data area access
+ *
+ * Copyright (C) 2016 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. The name of Atmel may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ * Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USER_DATA_H_INCLUDED
+#define _HPL_USER_DATA_H_INCLUDED
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Read data from user data area
+ *
+ * The user data area could be the area that stores user data that is not erased
+ * with the flash contents, e.g.,
+ * - NVM Software Calibration Area of SAM D/L/C family
+ * - User Signature of SAM E/S/V 70
+ *
+ * \param[in] base The base address of the user area
+ * \param[in] offset The byte offset of the data to be read inside the area
+ * \param[out] buf Pointer to buffer to place the read data
+ * \param[in] size Size of data in number of bytes
+ *
+ * \return Operation status or bytes read.
+ * \retval ERR_NONE Data read successfully
+ * \retval ERR_UNSUPPORTED_OP base address not in any supported user area
+ * \retval ERR_BAD_ADDRESS offset not in right area
+ * \retval ERR_INVALID_ARG offset and size exceeds the right area
+ */
+int32_t _user_area_read(const void *base, const uint32_t offset, uint8_t *buf, const uint32_t size);
+
+/**
+ * \brief Read no more than 32 bits data from user data area
+ *
+ * When reading bits, the bitfield can cross 32-bis boundaries.
+ *
+ * \param[in] base The base address of the user area
+ * \param[in] bit_offset Offset in number of bits
+ * \param[in] n_bits Number of bits to read
+ * \return data read, assert if anything wrong (address not in user area
+ * offset, size error, etc.).
+ */
+uint32_t _user_area_read_bits(const void *base, const uint32_t bit_offset, const uint8_t n_bits);
+
+/**
+ * \brief Write data to user data area
+ *
+ * The user data area could be the area that stores user data that is not erased
+ * with the flash contents, e.g.,
+ * - NVM Software Calibration Area of SAM D/L/C family
+ * - User Signature of SAM E/S/V 70
+ *
+ * When assigned offset and size exceeds the data area, error is reported.
+ *
+ * \param[out] base The base address of the user area
+ * \param[in] offset The offset of the data to be written inside the area
+ * \param[in] buf Pointer to buffer to place the written data
+ * \param[in] size Size of data in number of bytes
+ *
+ * \return Operation status or bytes writting.
+ * \retval ERR_NONE Data written successfully
+ * \retval ERR_UNSUPPORTED_OP base address not in any supported user area
+ * \retval ERR_DENIED Security bit is set
+ * \retval ERR_BAD_ADDRESS offset not in right area
+ * \retval ERR_INVALID_ARG offset and size exceeds the right area
+ */
+int32_t _user_area_write(void *base, const uint32_t offset, const uint8_t *buf, const uint32_t size);
+
+/**
+ * \brief Write no more than 32 bits data to user data area
+ *
+ * When writting bits, the bitfield can cross 32-bis boundaries.
+ *
+ * \param[out] base The base address of the user area
+ * \param[in] bit_offset Offset in number of bits
+ * \param[in] bits The data content
+ * \param[in] n_bits Number of bits to write
+ * \return Operation result
+ * \retval ERR_NONE Data written successfully
+ * \retval ERR_UNSUPPORTED_OP base address not in any supported user area
+ * \retval ERR_DENIED Security bit is set
+ * \retval ERR_BAD_ADDRESS offset not in right area
+ * \retval ERR_INVALID_ARG offset and size exceeds the right area
+ */
+int32_t _user_area_write_bits(void *base, const uint32_t bit_offset, const uint32_t bits, const uint8_t n_bits);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_USER_DATA_H_INCLUDED */