#include <SPI.h>
byte Decode = 0x9;
byte Intensity = 0xA;
byte Scan = 0xB;
byte Shutdown = 0xC;
byte Test = 0xF;
void max7219(byte r,byte d){
  digitalWrite(SS, LOW);  //選取晶片
  SPI.transfer(r);  //暫存器位址
  SPI.transfer(d);  //資料
  digitalWrite(SS, HIGH);  //取消選取晶片
}
void clear(){
  for(int i = 1;i <= 8;i++){
    max7219(i, 0);
  }
}

byte data[8]={0x18, 0x3c, 0x7E, 0xFF, 0x3c, 0x3c, 0x3c, 0x3c};

void setup() {
  SPI.begin();
  max7219(Decode,0);
  max7219(Intensity,7);
  max7219(Scan,7);
  max7219(Shutdown,1);
  max7219(Test,0);
  clear();
}

void loop() {
  for(int i = 0; i< 8;i++){
    max7219(i+1, data[i]);
  }
}