kopia lustrzana https://github.com/micropython/micropython
275 wiersze
11 KiB
C
275 wiersze
11 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 "Matt Trentini" <matt.trentini@gmail.com>
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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 "py/runtime.h"
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#include "modmachine.h"
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#include "mphalport.h"
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#include "driver/rmt.h"
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// This exposes the ESP32's RMT module to MicroPython. RMT is provided by the Espressif ESP-IDF:
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//
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// https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/rmt.html
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//
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// With some examples provided:
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//
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// https://github.com/espressif/arduino-esp32/tree/master/libraries/ESP32/examples/RMT
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//
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// RMT allows accurate (down to 12.5ns resolution) transmit - and receive - of pulse signals.
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// Originally designed to generate infrared remote control signals, the module is very
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// flexible and quite easy-to-use.
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//
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// This current MicroPython implementation lacks some major features, notably receive pulses
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// and carrier output.
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// Forward declaration
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extern const mp_obj_type_t esp32_rmt_type;
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typedef struct _esp32_rmt_obj_t {
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mp_obj_base_t base;
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uint8_t channel_id;
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gpio_num_t pin;
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uint8_t clock_div;
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uint16_t carrier_duty_percent;
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uint32_t carrier_freq;
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mp_uint_t num_items;
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rmt_item32_t *items;
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bool loop_en;
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} esp32_rmt_obj_t;
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STATIC mp_obj_t esp32_rmt_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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{ MP_QSTR_clock_div, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} }, // 100ns resolution
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{ MP_QSTR_carrier_duty_percent, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 50} },
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{ MP_QSTR_carrier_freq, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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mp_uint_t channel_id = args[0].u_int;
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gpio_num_t pin_id = machine_pin_get_id(args[1].u_obj);
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mp_uint_t clock_div = args[2].u_int;
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bool carrier_en = false;
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mp_uint_t carrier_duty_percent = 0;
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mp_uint_t carrier_freq = 0;
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if (args[4].u_int > 0) {
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carrier_en = true;
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carrier_duty_percent = args[3].u_int;
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carrier_freq = args[4].u_int;
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}
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if (clock_div < 1 || clock_div > 255) {
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mp_raise_ValueError(MP_ERROR_TEXT("clock_div must be between 1 and 255"));
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}
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esp32_rmt_obj_t *self = m_new_obj_with_finaliser(esp32_rmt_obj_t);
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self->base.type = &esp32_rmt_type;
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self->channel_id = channel_id;
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self->pin = pin_id;
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self->clock_div = clock_div;
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self->carrier_duty_percent = carrier_duty_percent;
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self->carrier_freq = carrier_freq;
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self->loop_en = false;
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rmt_config_t config;
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config.rmt_mode = RMT_MODE_TX;
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config.channel = (rmt_channel_t)self->channel_id;
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config.gpio_num = self->pin;
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config.mem_block_num = 1;
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config.tx_config.loop_en = 0;
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config.tx_config.carrier_en = carrier_en;
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config.tx_config.idle_output_en = 1;
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config.tx_config.idle_level = 0;
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config.tx_config.carrier_duty_percent = self->carrier_duty_percent;
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config.tx_config.carrier_freq_hz = self->carrier_freq;
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config.tx_config.carrier_level = 1;
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config.clk_div = self->clock_div;
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check_esp_err(rmt_config(&config));
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check_esp_err(rmt_driver_install(config.channel, 0, 0));
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC void esp32_rmt_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->pin != -1) {
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mp_printf(print, "RMT(channel=%u, pin=%u, source_freq=%u, clock_div=%u",
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self->channel_id, self->pin, APB_CLK_FREQ, self->clock_div);
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if (self->carrier_freq > 0) {
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mp_printf(print, ", carrier_freq=%u, carrier_duty_percent=%u)",
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self->carrier_freq, self->carrier_duty_percent);
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} else {
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mp_printf(print, ")");
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}
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} else {
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mp_printf(print, "RMT()");
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}
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}
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STATIC mp_obj_t esp32_rmt_deinit(mp_obj_t self_in) {
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// fixme: check for valid channel. Return exception if error occurs.
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->pin != -1) { // Check if channel has already been deinitialised.
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rmt_driver_uninstall(self->channel_id);
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self->pin = -1; // -1 to indicate RMT is unused
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m_free(self->items);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_rmt_deinit_obj, esp32_rmt_deinit);
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// Return the source frequency.
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// Currently only the APB clock (80MHz) can be used but it is possible other
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// clock sources will added in the future.
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STATIC mp_obj_t esp32_rmt_source_freq(mp_obj_t self_in) {
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return mp_obj_new_int(APB_CLK_FREQ);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_rmt_source_freq_obj, esp32_rmt_source_freq);
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// Return the clock divider.
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STATIC mp_obj_t esp32_rmt_clock_div(mp_obj_t self_in) {
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return mp_obj_new_int(self->clock_div);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_rmt_clock_div_obj, esp32_rmt_clock_div);
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// Query whether the channel has finished sending pulses. Takes an optional
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// timeout (in ticks of the 80MHz clock), returning true if the pulse stream has
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// completed or false if they are still transmitting (or timeout is reached).
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STATIC mp_obj_t esp32_rmt_wait_done(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_self, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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{ MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(args[0].u_obj);
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esp_err_t err = rmt_wait_tx_done(self->channel_id, args[1].u_int);
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return err == ESP_OK ? mp_const_true : mp_const_false;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp32_rmt_wait_done_obj, 1, esp32_rmt_wait_done);
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STATIC mp_obj_t esp32_rmt_loop(mp_obj_t self_in, mp_obj_t loop) {
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(self_in);
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self->loop_en = mp_obj_get_int(loop);
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if (!self->loop_en) {
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bool loop_en;
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check_esp_err(rmt_get_tx_loop_mode(self->channel_id, &loop_en));
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if (loop_en) {
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check_esp_err(rmt_set_tx_loop_mode(self->channel_id, false));
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check_esp_err(rmt_set_tx_intr_en(self->channel_id, true));
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}
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(esp32_rmt_loop_obj, esp32_rmt_loop);
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STATIC mp_obj_t esp32_rmt_write_pulses(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_self, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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{ MP_QSTR_pulses, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = mp_const_none} },
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{ MP_QSTR_start, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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esp32_rmt_obj_t *self = MP_OBJ_TO_PTR(args[0].u_obj);
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mp_obj_t pulses = args[1].u_obj;
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mp_uint_t start = args[2].u_int;
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if (start < 0 || start > 1) {
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mp_raise_ValueError(MP_ERROR_TEXT("start must be 0 or 1"));
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}
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size_t pulses_length = 0;
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mp_obj_t *pulses_ptr = NULL;
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mp_obj_get_array(pulses, &pulses_length, &pulses_ptr);
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mp_uint_t num_items = (pulses_length / 2) + (pulses_length % 2);
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if (num_items > self->num_items) {
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self->items = (rmt_item32_t *)m_realloc(self->items, num_items * sizeof(rmt_item32_t *));
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self->num_items = num_items;
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}
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for (mp_uint_t item_index = 0; item_index < num_items; item_index++) {
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mp_uint_t pulse_index = item_index * 2;
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self->items[item_index].duration0 = mp_obj_get_int(pulses_ptr[pulse_index++]);
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self->items[item_index].level0 = start++; // Note that start _could_ wrap.
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if (pulse_index < pulses_length) {
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self->items[item_index].duration1 = mp_obj_get_int(pulses_ptr[pulse_index]);
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self->items[item_index].level1 = start++;
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}
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}
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if (self->loop_en) {
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bool loop_en;
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check_esp_err(rmt_get_tx_loop_mode(self->channel_id, &loop_en));
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if (loop_en) {
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check_esp_err(rmt_set_tx_intr_en(self->channel_id, true));
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check_esp_err(rmt_set_tx_loop_mode(self->channel_id, false));
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}
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check_esp_err(rmt_wait_tx_done(self->channel_id, portMAX_DELAY));
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check_esp_err(rmt_set_tx_intr_en(self->channel_id, false));
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}
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check_esp_err(rmt_write_items(self->channel_id, self->items, num_items, false /* non-blocking */));
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if (self->loop_en) {
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check_esp_err(rmt_set_tx_loop_mode(self->channel_id, true));
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp32_rmt_write_pulses_obj, 2, esp32_rmt_write_pulses);
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STATIC const mp_rom_map_elem_t esp32_rmt_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&esp32_rmt_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&esp32_rmt_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_source_freq), MP_ROM_PTR(&esp32_rmt_source_freq_obj) },
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{ MP_ROM_QSTR(MP_QSTR_clock_div), MP_ROM_PTR(&esp32_rmt_clock_div_obj) },
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{ MP_ROM_QSTR(MP_QSTR_wait_done), MP_ROM_PTR(&esp32_rmt_wait_done_obj) },
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{ MP_ROM_QSTR(MP_QSTR_loop), MP_ROM_PTR(&esp32_rmt_loop_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write_pulses), MP_ROM_PTR(&esp32_rmt_write_pulses_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(esp32_rmt_locals_dict, esp32_rmt_locals_dict_table);
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const mp_obj_type_t esp32_rmt_type = {
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{ &mp_type_type },
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.name = MP_QSTR_RMT,
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.print = esp32_rmt_print,
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.make_new = esp32_rmt_make_new,
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.locals_dict = (mp_obj_dict_t *)&esp32_rmt_locals_dict,
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};
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