Create led_strip_rmt_ws2812.c (IEC-253)

led_strip/examples/led_strip_rmt_ws2812.c

@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "led_strip.h"
+#include "esp_log.h"
+#include "esp_err.h"
+
+// GPIO assignment
+#define LED_STRIP_GPIO_PIN  2
+// Numbers of the LED in the strip
+#define LED_STRIP_LED_COUNT 256
+// 10MHz resolution, 1 tick = 0.1us (led strip needs a high resolution)
+#define LED_STRIP_RMT_RES_HZ  (10 * 1000 * 1000)
+
+static const char *TAG = "example";
+
+led_strip_handle_t configure_led(void)
+{
+    // LED strip general initialization, according to your led board design
+    led_strip_config_t strip_config = {
+        .strip_gpio_num = LED_STRIP_GPIO_PIN, // The GPIO that connected to the LED strip's data line
+        .max_leds = LED_STRIP_LED_COUNT,      // The number of LEDs in the strip,
+        .led_model = LED_MODEL_WS2812,        // LED strip model
+        .color_component_format = LED_STRIP_COLOR_COMPONENT_FMT_GRB, // The color order of the strip: GRB
+        .flags = {
+            .invert_out = false, // don't invert the output signal
+        }
+    };
+
+    // LED strip backend configuration: RMT
+    led_strip_rmt_config_t rmt_config = {
+        .clk_src = RMT_CLK_SRC_DEFAULT,        // different clock source can lead to different power consumption
+        .resolution_hz = LED_STRIP_RMT_RES_HZ, // RMT counter clock frequency
+        .mem_block_symbols = 1024,               // DMA buffer size
+        .flags = {
+            .with_dma = true, // DMA feature is available on chips like ESP32-S3/P4
+        }
+    };
+
+    // LED Strip object handle
+    led_strip_handle_t led_strip;
+    ESP_ERROR_CHECK(led_strip_new_rmt_device(&strip_config, &rmt_config, &led_strip));
+    ESP_LOGI(TAG, "Created LED strip object with RMT backend");
+    return led_strip;
+}
+
+// DMA may only be enabled on one strip.
+void app_main(void)
+{
+    led_strip_handle_t led_strip = configure_led();
+    bool led_on_off = false;
+
+    ESP_LOGI(TAG, "Start blinking LED strip");
+    while (1) {
+        if (led_on_off) {
+            /* Set the LED pixel using RGB from 0 (0%) to 255 (100%) for each color */
+            for (int i = 0; i < LED_STRIP_LED_COUNT; i++) {
+                ESP_ERROR_CHECK(led_strip_set_pixel(led_strip, i, 5, 5, 5));
+            }
+            /* Refresh the strip to send data */
+            ESP_ERROR_CHECK(led_strip_refresh(led_strip));
+            ESP_LOGI(TAG, "LED ON!");
+        } else {
+            /* Set all LED off to clear all pixels */
+            ESP_ERROR_CHECK(led_strip_clear(led_strip));
+            ESP_LOGI(TAG, "LED OFF!");
+        }
+
+        led_on_off = !led_on_off;
+        vTaskDelay(pdMS_TO_TICKS(500));
+    }
+}