void setup() {
  // put your setup code here, to run once:
volatile char *dr,*dr1,*dr2;
dr=0x30;dr1=0x107;dr2=0x21;
*dr=0xff;*dr1=0xff;*dr2=0xff;
}

void loop() {
  // put your main code here, to run repeatedly:
  volatile char *in,*in1,*in2;
  in=0x31;in1=0x108;in2=0x22;
 *in=0b01111001;*in1=0b11111110;*in2=0xff;
  volatile long i;
  
  for(i=0;i<750000;i++);
  *in=0b00111000;
 
*in1=0b11111101;

 for(i=0;i<550000;i++);
 
*in=0b01111001;
 *in1=0b11111011;
 for(i=0;i<550000;i++);

*in=0b00111001;
 *in1=0b11110111;
 for(i=0;i<550000;i++);


*in=0b01111000;
*in1=0b11101111;
 for(i=0;i<550000;i++);



 *in=0b01110000;
*in1=0b11011111;
 for(i=0;i<550000;i++);



*in=0b00111111;
*in1=0b10111111;
 for(i=0;i<550000;i++);


 *in=0b01010100;
*in1=0b01111111;
 for(i=0;i<550000;i++);

*in1=0xff;
  *in2=0b01111111;
*in=0b00000110;
 for(i=0;i<550000;i++);



   *in2=0b10111111;
*in=0b00111001;
 for(i=0;i<550000;i++);



  *in2=0b11011111;
*in=0b01101101;
 for(i=0;i<550000;i++);

}