109 lines
3.5 KiB
C
109 lines
3.5 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) 2017 Scott Shawcroft 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 <pwm.h>
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#include "ets_alt_task.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "mpconfigport.h"
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#include "shared-bindings/pulseio/PulseOut.h"
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#define NO_CHANNEL (255)
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static uint16_t *pulse_buffer = NULL;
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static volatile uint16_t pulse_index = 0;
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static uint16_t pulse_length;
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static volatile uint32_t current_compare = 0;
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void pulseout_set(pulseio_pulseout_obj_t *self, bool state) {
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// XXX double kludge
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//uint32_t duty = state ? pwm_get_period() * 11 : 0;
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uint32_t duty = state ? 1000 : 500;
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pwm_set_duty(duty, self->channel);
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pwm_start();
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}
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void pulseout_interrupt_handler(void *data) {
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pulseio_pulseout_obj_t *self = data;
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if (pulse_buffer == NULL || self->channel == NO_CHANNEL) return;
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if (pulse_index >= pulse_length) return;
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pulse_index++;
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pulseout_set(self, pulse_index % 2 == 0);
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os_timer_arm(&self->timer, pulse_buffer[pulse_index], 0);
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}
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void pulseout_reset() {
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pulse_buffer = NULL;
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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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self->channel = carrier->channel;
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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->channel == NO_CHANNEL;
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}
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void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t* self) {
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os_timer_disarm(&self->timer);
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self->channel = NO_CHANNEL;
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pulseout_set(self, true);
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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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if (pulse_buffer != NULL) {
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mp_raise_RuntimeError("Another send is already active");
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}
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pulse_buffer = pulses;
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pulse_index = 0;
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pulse_length = length;
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os_timer_disarm(&self->timer);
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os_timer_setfn(&self->timer, pulseout_interrupt_handler, self);
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os_timer_arm(&self->timer, pulse_buffer[0], 0);
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pulseout_set(self, true);
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// XXX in the circumstances, is it worth messing with os_timer?
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// it isn't especially accurate anyway ...
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// might it not be simpler to just call mp_hal_delay_us() a lot?
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while(pulse_index < length) {
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ets_loop_iter();
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}
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os_timer_disarm(&self->timer);
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pulseout_set(self, false);
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pulse_buffer = NULL;
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}
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