135 lines
4.7 KiB
C
135 lines
4.7 KiB
C
/*
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* This file is part of the MicroPython 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) 2021 Dave Putz for Adafruit Industries
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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 "common-hal/pulseio/PulseOut.h"
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#include <stdint.h>
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#include "mpconfigport.h"
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#include "py/runtime.h"
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#include "shared-bindings/pulseio/PulseOut.h"
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#include "shared-bindings/pwmio/PWMOut.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "common-hal/pwmio/PWMOut.h"
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#include "supervisor/shared/translate.h"
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#include "src/rp2040/hardware_structs/include/hardware/structs/pwm.h"
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#include "src/rp2_common/hardware_gpio/include/hardware/gpio.h"
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#include "src/rp2_common/hardware_pwm/include/hardware/pwm.h"
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#include "src/common/pico_time/include/pico/time.h"
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volatile alarm_id_t cur_alarm = 0;
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static void pulse_finish(pulseio_pulseout_obj_t *self) {
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self->pulse_index++;
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// Turn pwm pin off by switching the GPIO mux to SIO (the cpu manual
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// control).
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if (self->pulse_index >= self->pulse_length) {
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gpio_set_function(self->pin, GPIO_FUNC_SIO);
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return;
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}
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if (self->pulse_index % 2 == 0) {
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gpio_set_function(self->pin, GPIO_FUNC_PWM);
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} else {
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gpio_set_function(self->pin, GPIO_FUNC_SIO);
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}
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uint64_t delay = self->pulse_buffer[self->pulse_index];
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if (delay < self->min_pulse) {
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delay = self->min_pulse;
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}
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cur_alarm = 0;
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// if the alarm cannot be set, try again with a longer delay
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while (cur_alarm == 0) {
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cur_alarm = add_alarm_in_us(delay, pulseout_interrupt_handler, self, false);
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delay = delay + 1;
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}
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}
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int64_t pulseout_interrupt_handler(alarm_id_t id, void *user_data) {
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pulse_finish(user_data);
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return 0;
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}
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void pulseout_reset() {
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}
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void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t *self,
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const mcu_pin_obj_t *pin,
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uint32_t frequency,
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uint16_t duty_cycle) {
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pwmout_result_t result = common_hal_pwmio_pwmout_construct(
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&self->carrier, pin, 0, frequency, false);
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// This will raise an exception and not return if needed.
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common_hal_pwmio_pwmout_raise_error(result);
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// Disable gpio output before we set the duty cycle.
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gpio_put(pin->number, false);
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gpio_set_dir(pin->number, GPIO_OUT);
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gpio_set_function(pin->number, GPIO_FUNC_SIO);
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common_hal_pwmio_pwmout_set_duty_cycle(&self->carrier, duty_cycle);
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self->pin = pin->number;
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self->slice = self->carrier.slice;
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self->min_pulse = (1000000 / self->carrier.actual_frequency);
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}
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bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t *self) {
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return self->pin == NO_PIN;
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}
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void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t *self) {
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if (common_hal_pulseio_pulseout_deinited(self)) {
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return;
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}
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gpio_set_dir(self->pin, GPIO_IN);
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common_hal_pwmio_pwmout_deinit(&self->carrier);
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self->pin = NO_PIN;
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}
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void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t *self, uint16_t *pulses, uint16_t length) {
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self->pulse_buffer = pulses;
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self->pulse_index = 0;
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self->pulse_length = length;
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// Turn on the signal by connecting the PWM to the outside pin.
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gpio_set_function(self->pin, GPIO_FUNC_PWM);
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uint64_t delay = self->pulse_buffer[0];
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if (delay < self->min_pulse) {
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delay = self->min_pulse;
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}
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cur_alarm = 0;
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// if the alarm cannot be set, try again with a longer delay
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while (cur_alarm == 0) {
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cur_alarm = add_alarm_in_us(delay, pulseout_interrupt_handler, self, false);
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delay = delay + 1;
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}
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while (self->pulse_index < length) {
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// Do other things while we wait. The interrupts will handle sending the
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// signal.
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RUN_BACKGROUND_TASKS;
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}
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}
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