0ae344841f
This prevents corrupting previous functional objects by stealing their pins out from under them. It prevents this by ensuring that pins are in default state before claiming them. It also verifies pins are released correctly and reset on soft reset. Fixes #4, instantiating a second class will fail. Fixes #29, pins are now reset too.
117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include "py/runtime.h"
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#include "shared-bindings/nativeio/PWMOut.h"
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#include "samd21_pins.h"
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void common_hal_nativeio_pwmout_construct(nativeio_pwmout_obj_t* self, const mcu_pin_obj_t* pin, uint16_t duty) {
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self->pin = pin;
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self->using_primary_timer = true;
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if (pin->primary_timer.tc == 0 && pin->secondary_timer.tc == 0) {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
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"PWM not supported on pin %q", self->pin->name));
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}
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// TODO(tannewt): Support output on multiple timer channels at once.
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const pin_timer_t* t = &pin->primary_timer;
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if (t->is_tc) {
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struct tc_config config_tc;
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tc_get_config_defaults(&config_tc);
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config_tc.counter_size = TC_COUNTER_SIZE_8BIT;
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config_tc.wave_generation = TC_WAVE_GENERATION_NORMAL_PWM;
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config_tc.clock_prescaler = TC_CLOCK_PRESCALER_DIV256;
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config_tc.counter_8_bit.period = 0xff;
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config_tc.counter_8_bit.compare_capture_channel[t->channel] = duty;
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config_tc.pwm_channel[t->wave_output].enabled = true;
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config_tc.pwm_channel[t->wave_output].pin_out = pin->pin;
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config_tc.pwm_channel[t->wave_output].pin_mux = MUX_E;
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tc_init(&self->tc_instance, t->tc, &config_tc);
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tc_enable(&self->tc_instance);
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} else {
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struct tcc_config config_tcc;
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tcc_get_config_defaults(&config_tcc, t->tcc);
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config_tcc.counter.clock_prescaler = TCC_CLOCK_PRESCALER_DIV256;
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config_tcc.counter.period = 0xFF;
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config_tcc.compare.wave_generation = TCC_WAVE_GENERATION_SINGLE_SLOPE_PWM;
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config_tcc.compare.match[t->channel] = duty;
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config_tcc.pins.enable_wave_out_pin[t->wave_output] = true;
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config_tcc.pins.wave_out_pin[t->wave_output] = pin->pin;
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config_tcc.pins.wave_out_pin_mux[t->wave_output] = MUX_E;
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tcc_init(&self->tcc_instance, t->tcc, &config_tcc);
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tcc_enable(&self->tcc_instance);
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}
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}
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extern void common_hal_nativeio_pwmout_deinit(nativeio_pwmout_obj_t* self) {
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const pin_timer_t* t = &self->pin->primary_timer;
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if (!self->using_primary_timer) {
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t = &self->pin->secondary_timer;
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}
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if (t->is_tc) {
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tc_disable(&self->tc_instance);
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} else {
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tcc_disable(&self->tcc_instance);
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}
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reset_pin(self->pin->pin);
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}
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extern void common_hal_nativeio_pwmout_set_duty_cycle(nativeio_pwmout_obj_t* self, uint16_t duty) {
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const pin_timer_t* t = &self->pin->primary_timer;
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if (!self->using_primary_timer) {
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t = &self->pin->secondary_timer;
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}
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if (t->tcc != 0) {
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tcc_set_compare_value(&self->tcc_instance, t->channel, duty);
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} else {
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tc_set_compare_value(&self->tc_instance, t->channel, duty);
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}
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}
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uint16_t common_hal_nativeio_pwmout_get_duty_cycle(nativeio_pwmout_obj_t* self) {
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const pin_timer_t* t = &self->pin->primary_timer;
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if (!self->using_primary_timer) {
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t = &self->pin->secondary_timer;
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}
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if (t->tcc != 0) {
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return tcc_get_capture_value(&self->tcc_instance, t->channel);
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} else {
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return tc_get_capture_value(&self->tc_instance, t->channel);
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}
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}
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