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circuitpython/ports/cxd56/common-hal/pulseio/PWMOut.c

159 lines
4.9 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright 2019 Sony Semiconductor Solutions Corporation
*
* 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 <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "py/runtime.h"
#include "shared-bindings/pulseio/PWMOut.h"
typedef struct {
const char* devpath;
const mcu_pin_obj_t *pin;
int fd;
bool reset;
} pwmout_dev_t;
STATIC pwmout_dev_t pwmout_dev[] = {
{"/dev/pwm0", &pin_PWM0, -1, true},
{"/dev/pwm1", &pin_PWM1, -1, true},
{"/dev/pwm2", &pin_PWM2, -1, true},
{"/dev/pwm3", &pin_PWM3, -1, true}
};
pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t *self,
const mcu_pin_obj_t *pin, uint16_t duty, uint32_t frequency,
bool variable_frequency) {
self->number = -1;
for (int i = 0; i < MP_ARRAY_SIZE(pwmout_dev); i++) {
if (pin->number == pwmout_dev[i].pin->number) {
self->number = i;
break;
}
}
if (self->number < 0) {
return PWMOUT_INVALID_PIN;
}
if (pwmout_dev[self->number].fd < 0) {
pwmout_dev[self->number].fd = open(pwmout_dev[self->number].devpath, O_RDONLY);
if (pwmout_dev[self->number].fd < 0) {
return PWMOUT_INVALID_PIN;
}
}
self->info.frequency = frequency;
self->info.duty = duty;
self->variable_frequency = variable_frequency;
if (ioctl(pwmout_dev[self->number].fd, PWMIOC_SETCHARACTERISTICS, (unsigned long)((uintptr_t)&self->info)) < 0) {
mp_raise_ValueError(translate("Invalid PWM frequency"));
}
ioctl(pwmout_dev[self->number].fd, PWMIOC_START, 0);
claim_pin(pin);
self->pin = pin;
return PWMOUT_OK;
}
void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t *self) {
if (common_hal_pulseio_pwmout_deinited(self)) {
return;
}
ioctl(pwmout_dev[self->number].fd, PWMIOC_STOP, 0);
close(pwmout_dev[self->number].fd);
pwmout_dev[self->number].fd = -1;
reset_pin_number(self->pin->number);
self->pin = NULL;
}
bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t *self) {
return pwmout_dev[self->number].fd < 0;
}
void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t *self, uint16_t duty) {
self->info.duty = duty;
ioctl(pwmout_dev[self->number].fd, PWMIOC_SETCHARACTERISTICS, (unsigned long)((uintptr_t)&self->info));
}
uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t *self) {
return self->info.duty;
}
void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t *self, uint32_t frequency) {
self->info.frequency = frequency;
if (ioctl(pwmout_dev[self->number].fd, PWMIOC_SETCHARACTERISTICS, (unsigned long)((uintptr_t)&self->info)) < 0) {
mp_raise_ValueError(translate("Invalid PWM frequency"));
}
}
uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t *self) {
return self->info.frequency;
}
bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t *self) {
return self->variable_frequency;
}
void common_hal_pulseio_pwmout_never_reset(pulseio_pwmout_obj_t *self) {
never_reset_pin_number(self->pin->number);
pwmout_dev[self->number].reset = false;
}
void common_hal_pulseio_pwmout_reset_ok(pulseio_pwmout_obj_t *self) {
pwmout_dev[self->number].reset = true;
}
void pwmout_reset(void) {
for (int i = 0; i < MP_ARRAY_SIZE(pwmout_dev); i++) {
if (pwmout_dev[i].fd >= 0 && pwmout_dev[i].reset) {
ioctl(pwmout_dev[i].fd, PWMIOC_STOP, 0);
close(pwmout_dev[i].fd);
pwmout_dev[i].fd = -1;
reset_pin_number(pwmout_dev[i].pin->number);
}
}
}
void pwmout_start(uint8_t pwm_num) {
ioctl(pwmout_dev[pwm_num].fd, PWMIOC_START, 0);
}
void pwmout_stop(uint8_t pwm_num) {
ioctl(pwmout_dev[pwm_num].fd, PWMIOC_STOP, 0);
}