#include <Arduino.h>

// 硬件配置
const int LED_PIN = 2;          // 使用内置LED（通常为GPIO2）
const int UART_TX_PIN = 1;      // UART发送引脚（根据实际硬件调整）
const unsigned long BAUD_RATE = 9600;

// 全局变量
unsigned long startTime = 0;
int currentBrightness = 0;
enum Phase { INCREASE, PAUSE, DECREASE };
Phase currentPhase = INCREASE;

void setup() {
  Serial.begin(BAUD_RATE);
    pinMode(LED_PIN, OUTPUT);
      Serial.println("System initialized");
      }

      void loop() {
        switch (currentPhase) {
            case INCREASE:
                  Serial.println("INCREASE_PHASE STARTED");
                        for (int i = 0; i <= 100; i += 10) {
                                currentBrightness = i;
                                        analogWrite(LED_PIN, map(currentBrightness, 0, 100, 0, 255)); // 将百分比转为0-255
                                                delay(1000); // 每秒增加一次亮度
                                                      }
                                                            currentPhase = PAUSE;
                                                                  break;

                                                                      case PAUSE:
                                                                            Serial.println("PAUSE_PHASE STARTED");
                                                                                  delay(10000); // 暂停10秒
                                                                                        currentPhase = DECREASE;
                                                                                              break;

                                                                                                  case DECREASE:
                                                                                                        Serial.println("DECREASE_PHASE STARTED");
                                                                                                              for (int i = 100; i >= 0; i -= 10) {
                                                                                                                      currentBrightness = i;
                                                                                                                              analogWrite(LED_PIN, map(currentBrightness, 0, 100, 0, 255));
                                                                                                                                      delay(1000);
                                                                                                                                            }
                                                                                                                                                  currentPhase = PAUSE;
                                                                                                                                                        break;
                                                                                                                                                          }
                                                                                                                                                          }