init

examples/led_strip_spi_ws2812/main/CMakeLists.txt

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+idf_component_register(SRCS "led_strip_spi_ws2812_main.c"
+                       INCLUDE_DIRS ".")

examples/led_strip_spi_ws2812/main/idf_component.yml

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+dependencies:
+  espressif/led_strip:
+    version: ^3
+  idf: '>=5.1'

examples/led_strip_spi_ws2812/main/led_strip_spi_ws2812_main.c

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+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#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 24
+
+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
+        // set the color order of the strip: GRB
+        .color_component_format = {
+            .format = {
+                .r_pos = 1, // red is the second byte in the color data
+                .g_pos = 0, // green is the first byte in the color data
+                .b_pos = 2, // blue is the third byte in the color data
+                .num_components = 3, // total 3 color components
+            },
+        },
+        .flags = {
+            .invert_out = false, // don't invert the output signal
+        }
+    };
+
+    // LED strip backend configuration: SPI
+    led_strip_spi_config_t spi_config = {
+        .clk_src = SPI_CLK_SRC_DEFAULT, // different clock source can lead to different power consumption
+        .spi_bus = SPI2_HOST,           // SPI bus ID
+        .flags = {
+            .with_dma = true, // Using DMA can improve performance and help drive more LEDs
+        }
+    };
+
+    // LED Strip object handle
+    led_strip_handle_t led_strip;
+    ESP_ERROR_CHECK(led_strip_new_spi_device(&strip_config, &spi_config, &led_strip));
+    ESP_LOGI(TAG, "Created LED strip object with SPI backend");
+    return led_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));
+    }
+}