const int dataPin = 2;  
const int clockPin = 4;  
const int latchPin = 12;  
const int keyPin = 13;  
int preKeyVal = 1;  
int keyState = 1;  // 通常按键未按下时状态为 HIGH  
unsigned long preTime = 0;  
int debounceDelay = 10;  
int keyNum = 0;  // 保存按键次数  
int stepNum = 1;  // 数据变化的步长值  
boolean firstFlag = true;  // keyNum 第一次为 1  
  
byte NUM[] = {0xFC, 0x60, 0xDA, 0xF2, 0x66, 0xB6, 0xBE, 0xE0, 0xFE, 0xF6, 0x00};  // 修正 0x0 为 0x00  
  
void setup() {  
  Serial.begin(9600);  
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);  
  pinMode(latchPin, OUTPUT);  
  pinMode(keyPin, INPUT);  
  
  // 等待按键释放  
  while (digitalRead(keyPin)) {  //1的时候永远循环
    //displayDigit(10);  
  }  
  
  // 显示数字 0 到 9  
  for (int i = 9; i >= 0; i--) {  
    displayDigit(i);  
    delay(300);  
  }  
}  
  
void loop() {  
  getKeyState();  
  displayDigit(keyNum);  
}  
  
void getKeyState() {  
  int keyVal = digitalRead(keyPin);  
  if (keyVal != preKeyVal) {  
    preTime = millis();  
    preKeyVal = keyVal;  
  }  
  if ((millis() - preTime) > debounceDelay) {  
    if (keyVal != keyState) {  
      keyState = keyVal;  
      if (keyVal == HIGH) {  // 按键按下  
      keyNum += stepNum;
      if(keyNum==5){
        stepNum=-1;
      }
      if(keyNum==1){
        stepNum=1;
        }
     /*  keyNum += stepNum;  
        if (!firstFlag) {  
          if ((keyNum == 1) || (keyNum == 5)) {  //if ((keyNum == 1) || (keyNum == 5)) 
            stepNum = -stepNum;  //没有十年脑血栓想不出来，不适合小初
          }  
        } 
      firstFlag = false;  */ 
      }  
    }  
  }  
}  
  
void displayDigit(byte num) {  
  shiftOut(dataPin, clockPin, LSBFIRST, ~NUM[num]);  
  digitalWrite(latchPin, HIGH);  
  digitalWrite(latchPin, LOW);  
}