125 lines
4.9 KiB
C
125 lines
4.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_check.h"
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#include "led_strip_rmt_encoder.h"
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static const char *TAG = "led_rmt_encoder";
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typedef struct {
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rmt_encoder_t base;
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rmt_encoder_t *bytes_encoder;
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rmt_encoder_t *copy_encoder;
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int state;
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rmt_symbol_word_t reset_code;
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} rmt_led_strip_encoder_t;
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static size_t rmt_encode_led_strip(rmt_encoder_t *encoder, rmt_channel_handle_t channel, const void *primary_data, size_t data_size, rmt_encode_state_t *ret_state)
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{
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rmt_led_strip_encoder_t *led_encoder = __containerof(encoder, rmt_led_strip_encoder_t, base);
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rmt_encoder_handle_t bytes_encoder = led_encoder->bytes_encoder;
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rmt_encoder_handle_t copy_encoder = led_encoder->copy_encoder;
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rmt_encode_state_t session_state = 0;
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rmt_encode_state_t state = 0;
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size_t encoded_symbols = 0;
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switch (led_encoder->state) {
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case 0: // send RGB data
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encoded_symbols += bytes_encoder->encode(bytes_encoder, channel, primary_data, data_size, &session_state);
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if (session_state & RMT_ENCODING_COMPLETE) {
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led_encoder->state = 1; // switch to next state when current encoding session finished
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}
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if (session_state & RMT_ENCODING_MEM_FULL) {
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state |= RMT_ENCODING_MEM_FULL;
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goto out; // yield if there's no free space for encoding artifacts
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}
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// fall-through
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case 1: // send reset code
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encoded_symbols += copy_encoder->encode(copy_encoder, channel, &led_encoder->reset_code,
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sizeof(led_encoder->reset_code), &session_state);
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if (session_state & RMT_ENCODING_COMPLETE) {
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led_encoder->state = 0; // back to the initial encoding session
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state |= RMT_ENCODING_COMPLETE;
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}
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if (session_state & RMT_ENCODING_MEM_FULL) {
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state |= RMT_ENCODING_MEM_FULL;
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goto out; // yield if there's no free space for encoding artifacts
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}
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}
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out:
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*ret_state = state;
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return encoded_symbols;
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}
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static esp_err_t rmt_del_led_strip_encoder(rmt_encoder_t *encoder)
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{
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rmt_led_strip_encoder_t *led_encoder = __containerof(encoder, rmt_led_strip_encoder_t, base);
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rmt_del_encoder(led_encoder->bytes_encoder);
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rmt_del_encoder(led_encoder->copy_encoder);
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free(led_encoder);
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return ESP_OK;
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}
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static esp_err_t rmt_led_strip_encoder_reset(rmt_encoder_t *encoder)
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{
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rmt_led_strip_encoder_t *led_encoder = __containerof(encoder, rmt_led_strip_encoder_t, base);
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rmt_encoder_reset(led_encoder->bytes_encoder);
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rmt_encoder_reset(led_encoder->copy_encoder);
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led_encoder->state = 0;
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return ESP_OK;
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}
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esp_err_t rmt_new_led_strip_encoder(const led_strip_encoder_config_t *config, rmt_encoder_handle_t *ret_encoder)
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{
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esp_err_t ret = ESP_OK;
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rmt_led_strip_encoder_t *led_encoder = NULL;
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ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
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led_encoder = calloc(1, sizeof(rmt_led_strip_encoder_t));
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ESP_GOTO_ON_FALSE(led_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for led strip encoder");
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led_encoder->base.encode = rmt_encode_led_strip;
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led_encoder->base.del = rmt_del_led_strip_encoder;
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led_encoder->base.reset = rmt_led_strip_encoder_reset;
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// different led strip might have its own timing requirements, following parameter is for WS2812
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rmt_bytes_encoder_config_t bytes_encoder_config = {
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.bit0 = {
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.level0 = 1,
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.duration0 = 0.3 * config->resolution / 1000000, // T0H=0.3us
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.level1 = 0,
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.duration1 = 0.9 * config->resolution / 1000000, // T0L=0.9us
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},
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.bit1 = {
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.level0 = 1,
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.duration0 = 0.9 * config->resolution / 1000000, // T1H=0.9us
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.level1 = 0,
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.duration1 = 0.3 * config->resolution / 1000000, // T1L=0.3us
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},
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.flags.msb_first = 1 // WS2812 transfer bit order: G7...G0R7...R0B7...B0
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};
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ESP_GOTO_ON_ERROR(rmt_new_bytes_encoder(&bytes_encoder_config, &led_encoder->bytes_encoder), err, TAG, "create bytes encoder failed");
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rmt_copy_encoder_config_t copy_encoder_config = {};
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ESP_GOTO_ON_ERROR(rmt_new_copy_encoder(©_encoder_config, &led_encoder->copy_encoder), err, TAG, "create copy encoder failed");
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uint32_t reset_ticks = config->resolution / 1000000 * 50 / 2; // reset code duration defaults to 50us
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led_encoder->reset_code = (rmt_symbol_word_t) {
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.level0 = 0,
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.duration0 = reset_ticks,
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.level1 = 0,
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.duration1 = reset_ticks,
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};
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*ret_encoder = &led_encoder->base;
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return ESP_OK;
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err:
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if (led_encoder) {
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if (led_encoder->bytes_encoder) {
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rmt_del_encoder(led_encoder->bytes_encoder);
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}
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if (led_encoder->copy_encoder) {
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rmt_del_encoder(led_encoder->copy_encoder);
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}
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free(led_encoder);
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}
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return ret;
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}
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