88 lines
3.2 KiB
C
88 lines
3.2 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) 2019 Lucian Copeland 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 "shared-bindings/pulseio/PulseOut.h"
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#include "shared-bindings/pwmio/PWMOut.h"
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#include "py/runtime.h"
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// Requires rmt.c void peripherals_reset_all(void) to reset
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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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rmt_channel_t channel = peripherals_find_and_reserve_rmt(TRANSMIT_MODE);
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if (channel == RMT_CHANNEL_MAX) {
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mp_raise_RuntimeError(translate("All timers in use"));
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}
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// Configure Channel
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rmt_config_t config = RMT_DEFAULT_CONFIG_TX(pin->number, channel);
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config.tx_config.carrier_en = true;
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config.tx_config.carrier_duty_percent = (duty_cycle * 100) / (1 << 16);
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config.tx_config.carrier_freq_hz = frequency;
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config.clk_div = 80;
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rmt_config(&config);
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rmt_driver_install(channel, 0, 0);
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self->channel = 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 == RMT_CHANNEL_MAX;
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}
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void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t *self) {
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peripherals_free_rmt(self->channel);
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self->channel = RMT_CHANNEL_MAX;
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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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rmt_item32_t items[length];
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// Circuitpython allows 16 bit pulse values, while ESP32 only allows 15 bits
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// Thus, we use entire items for one pulse, rather than switching inside each item
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for (size_t i = 0; i < length; i++) {
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// Setting the RMT duration to 0 has undefined behavior, so avoid that pre-emptively.
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if (pulses[i] == 0) {
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pulses[i] = 1;
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}
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uint32_t level = (i % 2) ? 0 : 1;
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const rmt_item32_t item = {{{ (pulses[i] & 0x8000 ? 0x7FFF : 1), level, (pulses[i] & 0x7FFF), level}}};
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items[i] = item;
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}
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rmt_write_items(self->channel, items, length, true);
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while (rmt_wait_tx_done(self->channel, 0) != ESP_OK) {
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RUN_BACKGROUND_TASKS;
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}
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}
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