void setup() {
  for(int i = 5; i <= 11; i++)
  {
    if(i == 7)
    {
      i = 9;
    }
    pinMode(i,OUTPUT);  //引脚初始化
  }
  pinMode(7,INPUT_PULLUP);  //引脚初始化
  pinMode(8,INPUT_PULLUP);  //引脚初始化
  Serial.begin(9600);       //串口初始化
}

/**
 * 按键7控制流水灯
 */
uint8_t Key_Num = 0;
int LED_IO = 5;
int Val = 0;
void loop() {
    
  /* 实现流水灯 */
  if(Key7_Scanf())    //若按键7按下，Key_Num = 1 
  {
    for(LED_IO; LED_IO <= 11; LED_IO++)//执行流水灯
    {
      /* 流水灯执行代码 */
      if(LED_IO == 7)
      {
        LED_IO = 9;
      }
      digitalWrite(LED_IO,HIGH);     //引脚输出高电平,打开LED
      if(LED_IO == 5)
      {
        digitalWrite(11,LOW);        //引脚输出高电平，关闭上一个LED
      }
      if(LED_IO == 9)
      {
        digitalWrite(6,LOW);
      }
      else
      {
        digitalWrite((LED_IO+11) % 12,LOW);//引脚输出高电平，关闭上一个LED
      }
      if(!Key7_Scanf()) //若按键再次按下，Key_Num = 0
      {
          break;        //终止循环，暂停流水灯
      }
      delay(100);
    }
    if(LED_IO > 11)
    {
      LED_IO = 5;
    }
  }

  /* 按键8调节LED亮度 */
  if(!Key7_Scanf()) //流水灯停止
  {
    if(Key8_Scanf())//按键8按下
    {
      Val += 80;
      if(Val > 255)
      {
        Val = 0;
      }
      Serial.print(LED_IO);  
      Serial.println(Val);//打印是哪一个LED引脚和占空比 
      analogWrite(LED_IO, Val);
    }
  }
}


/**
 * 读取按键7的值
 */
uint8_t Key7_Scanf(void)
{
  if(!digitalRead(7))   //按键7按下
  {
    delay(5);           //延时消抖
    if(!digitalRead(7)) //真的按下
    {
      while(!digitalRead(7)); //等待松手
      delay(5);               //延时消抖
      Key_Num = !Key_Num;
      Serial.println(Key_Num);
    }
  }
  return Key_Num;
}

/**
 * 读取按键8的值
 */
uint8_t Key8_Scanf(void)
{
  uint8_t Key8Num = 0;
   /* 按键8控制LED的亮度 */
  if(!digitalRead(8))   //按键8按下
  {
    delay(5);           //延时消抖
    if(!digitalRead(8)) //真的按下
    {
      while(!digitalRead(8)); //等待松手
      delay(5);               //延时消抖
      Key8Num = 1;
    }
  }
  return Key8Num;
}