circuitpython/atmel-samd/common-hal/nativeio/PWMOut.c

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/*
* 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 <stdint.h>
#include "py/runtime.h"
#include "shared-bindings/nativeio/PWMOut.h"
void common_hal_nativeio_pwmout_construct(nativeio_pwmout_obj_t* self, const mcu_pin_obj_t* pin, uint16_t duty) {
self->pin = pin;
self->using_primary_timer = true;
if (pin->primary_timer.tc == 0 && pin->primary_timer.tcc == 0 &&
pin->secondary_timer.tc == 0 && pin->secondary_timer.tcc == 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"PWM not supported on pin %q", self->pin->name));
}
// TODO(tannewt): Support output on multiple timer channels at once.
const pin_timer_t* t = &pin->primary_timer;
if (t->tcc != 0) {
struct tcc_config config_tcc;
tcc_get_config_defaults(&config_tcc, t->tcc);
config_tcc.counter.clock_prescaler = TCC_CLOCK_PRESCALER_DIV256;
config_tcc.counter.period = 0xFF;
config_tcc.compare.wave_generation = TCC_WAVE_GENERATION_SINGLE_SLOPE_PWM;
config_tcc.compare.match[t->channel] = duty;
config_tcc.pins.enable_wave_out_pin[t->wave_output] = true;
config_tcc.pins.wave_out_pin[t->wave_output] = t->pin;
config_tcc.pins.wave_out_pin_mux[t->wave_output] = t->mux;
tcc_init(&self->tcc_instance, t->tcc, &config_tcc);
tcc_enable(&self->tcc_instance);
} else {
struct tc_config config_tc;
tc_get_config_defaults(&config_tc);
config_tc.counter_size = TC_COUNTER_SIZE_8BIT;
config_tc.wave_generation = TC_WAVE_GENERATION_NORMAL_PWM;
config_tc.clock_prescaler = TC_CLOCK_PRESCALER_DIV256;
config_tc.counter_8_bit.period = 0xff;
config_tc.counter_8_bit.compare_capture_channel[t->channel] = duty;
config_tc.pwm_channel[t->wave_output].enabled = true;
config_tc.pwm_channel[t->wave_output].pin_out = t->pin;
config_tc.pwm_channel[t->wave_output].pin_mux = t->mux;
tc_init(&self->tc_instance, t->tc, &config_tc);
tc_enable(&self->tc_instance);
}
}
extern void common_hal_nativeio_pwmout_deinit(nativeio_pwmout_obj_t* self) {
const pin_timer_t* t = &self->pin->primary_timer;
if (!self->using_primary_timer) {
t = &self->pin->secondary_timer;
}
if (t->tcc != 0) {
tcc_disable(&self->tcc_instance);
} else {
tc_disable(&self->tc_instance);
}
}
extern void common_hal_nativeio_pwmout_set_duty_cycle(nativeio_pwmout_obj_t* self, uint16_t duty) {
const pin_timer_t* t = &self->pin->primary_timer;
if (!self->using_primary_timer) {
t = &self->pin->secondary_timer;
}
if (t->tcc != 0) {
tcc_set_compare_value(&self->tcc_instance, t->channel, duty);
} else {
tc_set_compare_value(&self->tc_instance, t->channel, duty);
}
}
uint16_t common_hal_nativeio_pwmout_get_duty_cycle(nativeio_pwmout_obj_t* self) {
const pin_timer_t* t = &self->pin->primary_timer;
if (!self->using_primary_timer) {
t = &self->pin->secondary_timer;
}
if (t->tcc != 0) {
return tcc_get_capture_value(&self->tcc_instance, t->channel);
} else {
return tc_get_capture_value(&self->tc_instance, t->channel);
}
}