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main/led_strip_example_main.c

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+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <string.h>
+#include <math.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "driver/rmt_tx.h"
+#include "led_strip_encoder.h"
+
+#define RMT_LED_STRIP_RESOLUTION_HZ 10000000 // 10MHz resolution
+#define RMT_LED_STRIP_GPIO_NUM      10       // GPIO10
+
+#define EXAMPLE_LED_NUMBERS         22       // 22个LED
+#define REFRESH_MS                  20       // 刷新间隔，20ms = 50fps
+#define BREATH_CYCLE_MS             3000     // 呼吸周期（淡入+淡出）
+#define CHASE_SPEED_DEG             5        // 每次色环偏移角度
+
+static const char *TAG = "rainbow_breath";
+
+static uint8_t led_strip_pixels[EXAMPLE_LED_NUMBERS * 3];
+
+/**
+ * @brief HSV转RGB
+ */
+void led_strip_hsv2rgb(uint32_t h, uint32_t s, uint32_t v, uint32_t *r, uint32_t *g, uint32_t *b)
+{
+    h %= 360;
+    uint32_t rgb_max = v * 255 / 100;
+    uint32_t rgb_min = rgb_max * (100 - s) / 100;
+
+    uint32_t i = h / 60;
+    uint32_t diff = h % 60;
+
+    uint32_t rgb_adj = (rgb_max - rgb_min) * diff / 60;
+
+    switch (i) {
+    case 0: *r = rgb_max; *g = rgb_min + rgb_adj; *b = rgb_min; break;
+    case 1: *r = rgb_max - rgb_adj; *g = rgb_max; *b = rgb_min; break;
+    case 2: *r = rgb_min; *g = rgb_max; *b = rgb_min + rgb_adj; break;
+    case 3: *r = rgb_min; *g = rgb_max - rgb_adj; *b = rgb_max; break;
+    case 4: *r = rgb_min + rgb_adj; *g = rgb_min; *b = rgb_max; break;
+    default: *r = rgb_max; *g = rgb_min; *b = rgb_max - rgb_adj; break;
+    }
+}
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "Create RMT TX channel on GPIO%d", RMT_LED_STRIP_GPIO_NUM);
+    rmt_channel_handle_t led_chan = NULL;
+    rmt_tx_channel_config_t tx_chan_config = {
+        .clk_src = RMT_CLK_SRC_DEFAULT,
+        .gpio_num = RMT_LED_STRIP_GPIO_NUM,
+        .mem_block_symbols = 64,
+        .resolution_hz = RMT_LED_STRIP_RESOLUTION_HZ,
+        .trans_queue_depth = 4,
+    };
+    ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &led_chan));
+
+    ESP_LOGI(TAG, "Install led strip encoder");
+    rmt_encoder_handle_t led_encoder = NULL;
+    led_strip_encoder_config_t encoder_config = {
+        .resolution = RMT_LED_STRIP_RESOLUTION_HZ,
+    };
+    ESP_ERROR_CHECK(rmt_new_led_strip_encoder(&encoder_config, &led_encoder));
+
+    ESP_LOGI(TAG, "Enable RMT TX channel");
+    ESP_ERROR_CHECK(rmt_enable(led_chan));
+
+    ESP_LOGI(TAG, "Start Rainbow Breath Chase, LED count: %d", EXAMPLE_LED_NUMBERS);
+    rmt_transmit_config_t tx_config = {
+        .loop_count = 0,
+    };
+
+    uint16_t hue_offset = 0;   // 彩虹色环偏移（跑马灯）
+    int breath_tick = 0;       // 呼吸时间计数器
+
+    while (1) {
+        // 计算当前呼吸亮度系数：0.0 ~ 1.0
+        float breath_phase = (2.0f * 3.1415926f * breath_tick * REFRESH_MS) / BREATH_CYCLE_MS;
+        float breath_brightness = (sinf(breath_phase) + 1.0f) / 2.0f;  // 0.0 ~ 1.0
+
+        // 为每个LED计算颜色：彩虹分布 + 呼吸亮度
+        for (int i = 0; i < EXAMPLE_LED_NUMBERS; i++) {
+            // 每个LED在色环上均匀分布，加上偏移实现流动
+            uint16_t hue = ((i * 360 / EXAMPLE_LED_NUMBERS) + hue_offset) % 360;
+
+            uint32_t r, g, b;
+            // 先计算全亮彩虹色
+            led_strip_hsv2rgb(hue, 100, 100, &r, &g, &b);
+
+            // 叠加呼吸亮度
+            r = (uint32_t)(r * breath_brightness);
+            g = (uint32_t)(g * breath_brightness);
+            b = (uint32_t)(b * breath_brightness);
+
+            // GRB顺序写入
+            led_strip_pixels[i * 3 + 0] = (uint8_t)g;
+            led_strip_pixels[i * 3 + 1] = (uint8_t)b;
+            led_strip_pixels[i * 3 + 2] = (uint8_t)r;
+        }
+
+        // 发送数据到灯带
+        ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, led_strip_pixels, sizeof(led_strip_pixels), &tx_config));
+        ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
+
+        // 更新跑马灯偏移
+        hue_offset = (hue_offset + CHASE_SPEED_DEG) % 360;
+
+        // 更新呼吸计数器
+        breath_tick++;
+
+        vTaskDelay(pdMS_TO_TICKS(REFRESH_MS));
+    }
+}