127 lines
3.5 KiB
C
127 lines
3.5 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 2019 Sony Semiconductor Solutions Corporation
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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 <stdio.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <arch/chip/timer.h>
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#include "py/runtime.h"
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#include "shared-bindings/pulseio/PulseOut.h"
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static uint16_t *pulse_buffer = NULL;
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static uint16_t pulse_index = 0;
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static uint16_t pulse_length;
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static int pulse_fd = -1;
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static bool pulseout_timer_handler(unsigned int *next_interval_us, void *arg)
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{
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uint8_t pwm_num = (uint8_t)(int)arg;
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pulse_index++;
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if (pulse_index >= pulse_length) {
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return false;
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}
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*next_interval_us = pulse_buffer[pulse_index] * 1000;
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if (pulse_index % 2 == 0) {
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pwmout_start(pwm_num);
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} else {
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pwmout_stop(pwm_num);
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}
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return true;
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}
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void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t *self,
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const pulseio_pwmout_obj_t *carrier) {
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if (pulse_fd < 0) {
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pulse_fd = open("/dev/timer0", O_RDONLY);
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}
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if (pulse_fd < 0) {
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mp_raise_RuntimeError(translate("All timers in use"));
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}
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self->pwm_num = carrier->number;
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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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ioctl(pulse_fd, TCIOC_STOP, 0);
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close(pulse_fd);
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pulse_fd = -1;
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pulse_buffer = NULL;
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}
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bool common_hal_pulseio_pulseout_deinited(pulseio_pulseout_obj_t *self) {
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return pulse_fd < 0;
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}
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void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t *self, uint16_t *pulses, uint16_t len) {
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if (pulse_buffer != NULL) {
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mp_raise_RuntimeError(translate("Another send is already active"));
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}
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struct timer_sethandler_s sethandler;
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pulse_buffer = pulses;
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pulse_index = 0;
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pulse_length = len;
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unsigned long timeout = pulse_buffer[0] * 1000;
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ioctl(pulse_fd, TCIOC_SETTIMEOUT, timeout);
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sethandler.handler = pulseout_timer_handler;
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sethandler.arg = (void *)(int)self->pwm_num;
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ioctl(pulse_fd, TCIOC_SETHANDLER, (unsigned long)&sethandler);
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ioctl(pulse_fd, TCIOC_START, 0);
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while(pulse_index < len) {
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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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pulse_buffer = NULL;
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}
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void pulseout_reset(void) {
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ioctl(pulse_fd, TCIOC_STOP, 0);
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close(pulse_fd);
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pulse_fd = -1;
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pulse_buffer = NULL;
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}
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