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Make the ESP-IDF v5.x RMT driver execute faster

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This commit is contained in:
Daniel Öster 2025-08-18 20:24:48 +03:00
parent f8138b04eb
commit 1ff3ff43e4
1 changed files with 29 additions and 13 deletions
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42
Software/src/lib/adafruit-Adafruit_NeoPixel/esp.c
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@ -2,11 +2,15 @@
#include "driver/rmt_tx.h" #include "driver/rmt_tx.h"
// This code is adapted for the ESP-IDF v5.x RMT driver API // This code is adapted for the ESP-IDF v5.x RMT driver API
// WS2812 timing parameters (in nanoseconds) // WS2812 timing parameters (in nanoseconds)
#define WS2812_T0H_NS 350 #define WS2812_T0H_NS (400)
#define WS2812_T0L_NS 1000 #define WS2812_T0L_NS (850)
#define WS2812_T1H_NS 900 #define WS2812_T1H_NS (800)
#define WS2812_T1L_NS 350 #define WS2812_T1L_NS (450)
#define WS2812_RESET_US 280 #define WS2812_RESET_US 280
#define WS2812_T0H_TICKS (WS2812_T0H_NS / 25)
#define WS2812_T0L_TICKS (WS2812_T0L_NS / 25)
#define WS2812_T1H_TICKS (WS2812_T1H_NS / 25)
#define WS2812_T1L_TICKS (WS2812_T1L_NS / 25)
static rmt_channel_handle_t led_chan = NULL; static rmt_channel_handle_t led_chan = NULL;
static rmt_encoder_handle_t led_encoder = NULL; static rmt_encoder_handle_t led_encoder = NULL;
@ -131,23 +135,35 @@ err:
return ret; return ret;
} }
void espShow(uint8_t pin, uint8_t* pixels, uint8_t numBytes) { void espShow(uint8_t pin, uint8_t* pixels, uint32_t numBytes) {
if (led_chan == NULL) { static bool initialized = false;
if (!initialized) {
rmt_tx_channel_config_t tx_chan_config = { rmt_tx_channel_config_t tx_chan_config = {
.clk_src = RMT_CLK_SRC_DEFAULT, .clk_src = RMT_CLK_SRC_DEFAULT,
.gpio_num = pin, .gpio_num = pin,
.mem_block_symbols = 64, .mem_block_symbols = 64,
.resolution_hz = 10 * 1000 * 1000, .resolution_hz = 40 * 1000 * 1000, // 40 MHz
.trans_queue_depth = 4, .trans_queue_depth = 4,
}; };
ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &led_chan)); ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &led_chan));
ESP_ERROR_CHECK(rmt_new_led_strip_encoder(&led_encoder));
rmt_bytes_encoder_config_t bytes_encoder_config = {
.bit0 = { .level0 = 1, .duration0 = WS2812_T0H_NS / 25,
.level1 = 0, .duration1 = WS2812_T0L_NS / 25 },
.bit1 = { .level0 = 1, .duration0 = WS2812_T1H_NS / 25,
.level1 = 0, .duration1 = WS2812_T1L_NS / 25 },
.flags.msb_first = 1
};
ESP_ERROR_CHECK(rmt_new_bytes_encoder(&bytes_encoder_config, &led_encoder));
ESP_ERROR_CHECK(rmt_enable(led_chan)); ESP_ERROR_CHECK(rmt_enable(led_chan));
initialized = true;
} }
rmt_transmit_config_t tx_config = { rmt_transmit_config_t tx_config = { .loop_count = 0 };
.loop_count = 0,
};
ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, pixels, numBytes, &tx_config)); ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, pixels, numBytes, &tx_config));
ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
} // optional: only wait if strict timing required
// ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
}