Add PulseOut which can pulse a PWMOut for IR remote transmission.

5 files changed, 205 insertions, 0 deletions

diff --git a/atmel-samd/Makefile b/atmel-samd/Makefile
index 35db9b69d..5db6734f0 100644
--- a/atmel-samd/Makefile
+++ b/atmel-samd/Makefile
@@ -224,6 +224,7 @@ SRC_BINDINGS = \
 	nativeio/AnalogOut.c \
 	nativeio/DigitalInOut.c \
 	nativeio/I2C.c \
+	nativeio/PulseOut.c \
 	nativeio/PWMOut.c \
 	nativeio/SPI.c \
 	nativeio/UART.c \
diff --git a/atmel-samd/common-hal/nativeio/PulseOut.c b/atmel-samd/common-hal/nativeio/PulseOut.c
new file mode 100644
index 000000000..76ef849a1
--- /dev/null
+++ b/atmel-samd/common-hal/nativeio/PulseOut.c
@@ -0,0 +1,163 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "common-hal/nativeio/PulseOut.h"
+
+#include <stdint.h>
+
+#include "asf/sam0/drivers/tc/tc_interrupt.h"
+
+#include "mpconfigport.h"
+#include "py/runtime.h"
+#include "shared-bindings/nativeio/PulseOut.h"
+
+#undef ENABLE
+
+// This timer is shared amongst all PulseOut objects under the assumption that
+// the code is single threaded.
+static struct tc_module tc_instance;
+static uint8_t refcount = 0;
+
+static __IO PORT_PINCFG_Type *active_pincfg = NULL;
+static uint16_t *pulse_buffer = NULL;
+static volatile uint16_t pulse_index = 0;
+static uint16_t pulse_length;
+static volatile uint32_t current_compare = 0;
+
+static void turn_on(__IO PORT_PINCFG_Type * pincfg) {
+    pincfg->reg = PORT_PINCFG_PMUXEN;
+}
+
+static void turn_off(__IO PORT_PINCFG_Type * pincfg) {
+    pincfg->reg = PORT_PINCFG_RESETVALUE;
+}
+
+void pulse_finish(struct tc_module *const module) {
+    pulse_index++;
+
+    if (active_pincfg == NULL) {
+        return;
+    }
+    // Always turn it off.
+    turn_off(active_pincfg);
+    if (pulse_index >= pulse_length) {
+        return;
+    }
+    current_compare = (current_compare + pulse_buffer[pulse_index] * 3 / 4) & 0xffff;
+    tc_set_compare_value(&tc_instance, TC_COMPARE_CAPTURE_CHANNEL_0, current_compare);
+    if (pulse_index % 2 == 0) {
+        turn_on(active_pincfg);
+    }
+}
+
+void pulseout_reset() {
+    refcount = 0;
+    active_pincfg = NULL;
+}
+
+void common_hal_nativeio_pulseout_construct(nativeio_pulseout_obj_t* self,
+                                            const nativeio_pwmout_obj_t* carrier) {
+    if (refcount == 0) {
+        // Find a spare timer.
+        Tc *t = NULL;
+        Tc *tcs[TC_INST_NUM] = TC_INSTS;
+        for (uint8_t i = TC_INST_NUM; i > 0; i--) {
+            if (tcs[i - 1]->COUNT16.CTRLA.bit.ENABLE == 0) {
+                t = tcs[i - 1];
+                break;
+            }
+        }
+        if (t == NULL) {
+            mp_raise_RuntimeError("All timers in use");
+        }
+
+        struct tc_config config_tc;
+        tc_get_config_defaults(&config_tc);
+
+        config_tc.counter_size    = TC_COUNTER_SIZE_16BIT;
+        config_tc.clock_prescaler = TC_CTRLA_PRESCALER_DIV64;
+        config_tc.wave_generation = TC_WAVE_GENERATION_NORMAL_FREQ;
+
+        tc_init(&tc_instance, t, &config_tc);
+        tc_register_callback(&tc_instance, pulse_finish, TC_CALLBACK_CC_CHANNEL0);
+        tc_enable(&tc_instance);
+        tc_stop_counter(&tc_instance);
+    }
+    refcount++;
+
+    self->pin = carrier->pin->pin;
+
+    PortGroup *const port_base = port_get_group_from_gpio_pin(self->pin);
+    self->pincfg = &port_base->PINCFG[self->pin % 32];
+
+    // Set the port to output a zero.
+    port_base->OUTCLR.reg = 1 << (self->pin % 32);
+    port_base->DIRSET.reg = 1 << (self->pin % 32);
+
+    // Turn off the pinmux which should connect the port output.
+    turn_off(self->pincfg);
+}
+
+void common_hal_nativeio_pulseout_deinit(nativeio_pulseout_obj_t* self) {
+    PortGroup *const port_base = port_get_group_from_gpio_pin(self->pin);
+    port_base->DIRCLR.reg = 1 << (self->pin % 32);
+
+    turn_on(self->pincfg);
+
+    refcount--;
+    if (refcount == 0) {
+        tc_reset(&tc_instance);
+    }
+}
+
+void common_hal_nativeio_pulseout_send(nativeio_pulseout_obj_t* self, uint16_t* pulses, uint16_t length) {
+    if (active_pincfg != NULL) {
+        mp_raise_RuntimeError("Another send is already active");
+    }
+    active_pincfg = self->pincfg;
+    pulse_buffer = pulses;
+    pulse_index = 0;
+    pulse_length = length;
+
+    current_compare = pulses[0] * 3 / 4;
+    tc_set_compare_value(&tc_instance, TC_COMPARE_CAPTURE_CHANNEL_0, current_compare);
+
+    tc_enable_callback(&tc_instance, TC_CALLBACK_CC_CHANNEL0);
+    turn_on(active_pincfg);
+    tc_start_counter(&tc_instance);
+
+    while(pulse_index < length) {
+        // Do other things while we wait. The interrupts will handle sending the
+        // signal.
+        #ifdef MICROPY_VM_HOOK_LOOP
+            MICROPY_VM_HOOK_LOOP
+        #endif
+    }
+
+    tc_stop_counter(&tc_instance);
+    tc_disable_callback(&tc_instance, TC_CALLBACK_CC_CHANNEL0);
+    active_pincfg = NULL;
+}
diff --git a/atmel-samd/common-hal/nativeio/PulseOut.h b/atmel-samd/common-hal/nativeio/PulseOut.h
new file mode 100644
index 000000000..721670bef
--- /dev/null
+++ b/atmel-samd/common-hal/nativeio/PulseOut.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef __MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_NATIVEIO_PULSEOUT_H__
+#define __MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_NATIVEIO_PULSEOUT_H__
+
+void pulseout_reset(void);
+
+#endif // __MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_NATIVEIO_PULSEOUT_H__
diff --git a/atmel-samd/common-hal/nativeio/types.h b/atmel-samd/common-hal/nativeio/types.h
index c039ed293..ab999cfc6 100644
--- a/atmel-samd/common-hal/nativeio/types.h
+++ b/atmel-samd/common-hal/nativeio/types.h
@@ -101,6 +101,12 @@ typedef struct {
 
 typedef struct {
     mp_obj_base_t base;
+    __IO PORT_PINCFG_Type *pincfg;
+    uint8_t pin;
+} nativeio_pulseout_obj_t;
+
+typedef struct {
+    mp_obj_base_t base;
     // Only support TouchIn when external SPI flash is used.
     #ifdef SPI_FLASH_SECTOR_SIZE
     const mcu_pin_obj_t * pin;
diff --git a/atmel-samd/main.c b/atmel-samd/main.c
index ad124b58a..47edc2537 100644
--- a/atmel-samd/main.c
+++ b/atmel-samd/main.c
@@ -25,6 +25,7 @@
 #include <board.h>
 
 #include "common-hal/nativeio/AnalogIn.h"
+#include "common-hal/nativeio/PulseOut.h"
 #include "common-hal/nativeio/PWMOut.h"
 #include "common-hal/usb_hid/__init__.h"
 
@@ -170,6 +171,8 @@ void reset_samd21(void) {
 
     analogin_reset();
 
+    pulseout_reset();
+
     // Wait for the DAC to sync.
     while (DAC->STATUS.reg & DAC_STATUS_SYNCBUSY) {}
     DAC->CTRLA.reg |= DAC_CTRLA_SWRST;