添加普通LED支持，支持不同状态亮度设置和呼吸灯效果 (#283)

main/led/gpio_led.h

@@ -0,0 +1,45 @@
+#ifndef _GPIO_LED_H_
+#define _GPIO_LED_H_
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include "led.h"
+#include <driver/gpio.h>
+#include <driver/ledc.h>
+#include <esp_timer.h>
+#include <atomic>
+#include <mutex>
+
+class GpioLed : public Led {
+public:
+    GpioLed(gpio_num_t gpio, int output_invert=0);
+    virtual ~GpioLed();
+
+    void OnStateChanged() override;
+
+private:
+    std::mutex mutex_;
+    TaskHandle_t blink_task_ = nullptr;
+    ledc_channel_config_t ledc_channel_ = {0};
+    bool ledc_initialized_ = false;
+    uint32_t duty_ = 0;
+    int blink_counter_ = 0;
+    int blink_interval_ms_ = 0;
+    esp_timer_handle_t blink_timer_ = nullptr;
+    bool fade_up_ = true;
+
+    void StartBlinkTask(int times, int interval_ms);
+    void OnBlinkTimer();
+
+    void BlinkOnce();
+    void Blink(int times, int interval_ms);
+    void StartContinuousBlink(int interval_ms);
+    void TurnOn();
+    void TurnOff();
+    void SetBrightness(uint8_t brightness);
+    void StartFadeTask();
+    void OnFadeEnd();
+    static bool FadeCallback(const ledc_cb_param_t *param, void *user_arg);
+};
+
+#endif // _GPIO_LED_H_