4 bits 7 segment with shift registers

4bit7segment.ino

unsigned char LED_0F[] = 
{// 0 1  2   3 4 5  6   7 8 9  A   b C    d  E    F    -
  0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x8C,0xBF,0xC6,0xA1,0x86,0xFF,0xbf
};
unsigned char LED[4]; //用于LED的4位显示缓存
int SCLK = 2;
int RCLK = 1;
int DIO = 0; //这里定义了那三个脚
void setup ()
{
  pinMode(SCLK,OUTPUT);
  pinMode(RCLK,OUTPUT);
  pinMode(DIO,OUTPUT); //让三个脚都是输出状态
}
void loop()
{
  LED[0]=1;
  LED[1]=2;
  LED[2]=3;
  LED[3]=4;
  while(1)
  {
    LED4_Display ();
  } 

}

void LED4_Display (void)
{
  unsigned char *led_table;          // 查表指针
  unsigned char i;
  //显示第1位
  led_table = LED_0F + LED[0];
  i = *led_table;
  LED_OUT(i); 
  LED_OUT(0x01); 
  digitalWrite(RCLK,LOW);
  digitalWrite(RCLK,HIGH);
  //显示第2位
  led_table = LED_0F + LED[1];
  i = *led_table;
  LED_OUT(i); 
  LED_OUT(0x02); 
  digitalWrite(RCLK,LOW);
  digitalWrite(RCLK,HIGH);
  //显示第3位
  led_table = LED_0F + LED[2];
  i = *led_table;
  LED_OUT(i); 
  LED_OUT(0x04); 
  digitalWrite(RCLK,LOW);
  digitalWrite(RCLK,HIGH);
  //显示第4位
  led_table = LED_0F + LED[3];
  i = *led_table;
  LED_OUT(i); 
  LED_OUT(0x08); 
  digitalWrite(RCLK,LOW);
  digitalWrite(RCLK,HIGH);
}

void LED_OUT(unsigned char X)
{
  unsigned char i;
  for(i=8;i>=1;i--)
  {
    if (X&0x80) 
    {
      digitalWrite(DIO,HIGH);
    }  
    else 
    {
      digitalWrite(DIO,LOW);
    }
    X<<=1;
    digitalWrite(SCLK,LOW);
    digitalWrite(SCLK,HIGH);
  }
}