/*
 * 实验二：花样流水灯（完整版）
 * STM32 Nucleo-64 C031C6
 * 4个LED连接到：PA5, PA6, PA7, PB6
 * 包含6种基础花样 + 跑马灯效果
 */

// 定义LED引脚数组
int ledPins[] = {PA5, PA6, PA7, PB6};
int ledCount = 4;  // LED数量
int breathPin1=PB5;
int breathPin2=PB10;


// 延时时间（毫秒）
int delayTime = 200;

void setup() {
  // 将所有LED引脚设置为输出模式
  for (int i = 0; i < ledCount; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);  // 初始状态：全部熄灭
  }
  pinMode(breathPin1, OUTPUT);
  pinMode(breathPin2, OUTPUT);
  digitalWrite(breathPin1, LOW);
  digitalWrite(breathPin2, LOW);
}
void bothBreathLED(int duration){
  int cycleTime=15;
  int steps=duration / cycleTime;
  for (int i=0;i<steps;i++){
    float progress=(float)i / steps*2;
    float brightness;

    if (progress<=1.0){
      brightness=progress;
    }
    else{
      brightness=2.0-progress;
    }
    int onTime=max(1,(int)(cycleTime*brightness));
    int offTime=max(1,cycleTime-onTime);

    digitalWrite(breathPin1, HIGH);
    digitalWrite(breathPin2, HIGH);
    delay(onTime);
    digitalWrite(breathPin1, LOW);
    digitalWrite(breathPin2, LOW);
    delay(offTime);
  }
}
void loop() {
  // ===== 花样一：单向流水灯（从左到右）=====
  for (int i = 0; i < ledCount; i++) {
    digitalWrite(ledPins[i], HIGH);  // 点亮当前LED
    delay(delayTime);
    digitalWrite(ledPins[i], LOW);   // 熄灭当前LED
  }
  delay(delayTime * 2);  // 间隔时间
  bothBreathLED(1000);

  // ===== 花样二：反向流水灯（从右到左）=====
  for (int i = ledCount - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);
    delay(delayTime);
    digitalWrite(ledPins[i], LOW);
  }
  delay(delayTime * 2);
  bothBreathLED(1000);
  // ===== 花样三：双向流水灯（两端向中间）=====
  // 从两端向中间依次点亮
  for (int i = 0; i < ledCount / 2; i++) {
    digitalWrite(ledPins[i], HIGH);           // 左边第i个
    digitalWrite(ledPins[ledCount - 1 - i], HIGH);  // 右边第i个
    delay(delayTime);
    digitalWrite(ledPins[i], LOW);
    digitalWrite(ledPins[ledCount - 1 - i], LOW);
  }
  delay(delayTime * 2);
  bothBreathLED(1000);
  // ===== 花样四：全部同时闪烁 =====
  for (int j = 0; j < 3; j++) {  // 闪烁3次
    for (int i = 0; i < ledCount; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    for (int i = 0; i < ledCount; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(delayTime);
  }
  delay(delayTime * 3);
  bothBreathLED(1000);
  // ===== 花样五：累积点亮，然后累积熄灭 =====
  // 从左到右依次点亮，并保持亮着
  for (int i = 0; i < ledCount; i++) {
    digitalWrite(ledPins[i], HIGH);
    delay(delayTime);
  }
  // 从左到右依次熄灭
  for (int i = 0; i < ledCount; i++) {
    digitalWrite(ledPins[i], LOW);
    delay(delayTime);
  }
  delay(delayTime * 2);
  bothBreathLED(1000);
  // ===== 花样六：交替闪烁 =====
  // 奇数位LED和偶数位LED交替闪烁
  for (int j = 0; j < 4; j++) {  // 交替4次
    // 点亮偶数位（索引0,2）
    for (int i = 0; i < ledCount; i += 2) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    // 熄灭偶数位
    for (int i = 0; i < ledCount; i += 2) {
      digitalWrite(ledPins[i], LOW);
    }
    
    // 点亮奇数位（索引1,3）
    for (int i = 1; i < ledCount; i += 2) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(delayTime);
    // 熄灭奇数位
    for (int i = 1; i < ledCount; i += 2) {
      digitalWrite(ledPins[i], LOW);
    }
  }
  delay(delayTime * 3);
 
  // ===== 花样七：跑马灯效果（一个亮点来回跑）=====
  // 重复3次跑马灯效果
  for (int repeat = 0; repeat < 3; repeat++) {
    
    // 从左向右跑
    for (int i = 0; i < ledCount; i++) {
      digitalWrite(ledPins[i], HIGH);  // 点亮当前LED
      delay(delayTime / 2);             // 亮的时间
      digitalWrite(ledPins[i], LOW);    // 熄灭当前LED
      delay(delayTime / 2);             // 间隔时间
    }
    
    // 从右向左跑
    for (int i = ledCount - 1; i >= 0; i--) {
      digitalWrite(ledPins[i], HIGH);
      delay(delayTime / 2);
      digitalWrite(ledPins[i], LOW);
      delay(delayTime / 2);
    }
  }
  delay(delayTime * 4);  // 花样之间的较长间隔
  for (int repeat=0;repeat<5;repeat++){
     bothBreathLED(1500);
     }
  delay(delayTime*2);
 }