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Diffstat (limited to 'atmel-samd/asf4/samd21/hal/include/hpl_spi.h')
| -rw-r--r-- | atmel-samd/asf4/samd21/hal/include/hpl_spi.h | 173 |
1 files changed, 173 insertions, 0 deletions
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 */ |