void send_Din(char,unsigned char);
void cs_high_low();
void enable();
void init();
void out_din(char);
void out_clk(char);
void out_cs(char);


#define shutdown    0x0C
#define brightness  0x0A
#define scan_limit  0x0B
#define decode_mode 0x09

// char led_data[8] = {0x18,0x24,0x42,0x42,0x7E,0x42,0x42,0x42};//'A'
char led_data[8] = {0x00,0x41,0x43,0x45,0x49,0x51,0x61,0x41};//'N'
// char led_data[8] = {0x41,0x63,0x55,0x49,0x41,0x41,0x41,0x41};//'M'
// char led_data[8] = {0x41,0x22,0x14,0x08,0x08,0x08,0x08,0x08};//'Y'
  //  char led_data[8] = {0x1F,0x21,0x21,0x21,0x21,0x21,0x21,0x1F};//'D'

void setup() {
  init();
  out_cs(0x00);

  send_Din(scan_limit,0x07);
  send_Din(decode_mode,0x00);
  send_Din(brightness,0x0A);
  send_Din(shutdown,0x01);

  while(1){
   for(char i=1;i<9;i++){
    send_Din(i,led_data[i-1]);
   }
  }

}

void send_Din(char addr,unsigned char data){
    for(char i=7;i>=0;i--){
      out_din((addr>>i)&0x01);
      enable();
    }

    for(char i=7;i>=0;i--){
      out_din((data>>i)&0x01);
      enable();
    }
    
    cs_high_low();
}

void cs_high_low(){
  out_cs(0x01);
  delay1();
  out_cs(0x00);
}

void enable(){
  out_clk(0x01);
  delay1();
  out_clk(0x00);
  delay1();
}

void init(){
   char *ddr_din = (char*)0x30;
   *ddr_din = 0x01;

   char *ddr_clk = (char*)0x107;
   *ddr_clk = 0x01;

   char *ddr_cs = (char*)0x10A;
   *ddr_cs = 0x01;
}

void out_din(char data){
  char *out = (char*)0x31;
  *out = data;
}

void out_clk(char data){
  char *out = (char*)0x108;
  *out = data;
}

void out_cs(char data){
  char *out = (char*)0x10B;
  *out = data;
}

void delay1(){
  volatile long i;
  for(i=0;i<100;i++);
}

void loop() {
  // put your main code here, to run repeatedly:

}