void Start();
void Write(char);
void Stop();
void Delay();

void setup() {
  // put your setup code here, to run once:
Start();
Write(0x40);
Stop();
Start();
Write(0xC0);
Write(0x3F);
Write(0x06);
Write(0x5B);
Write(0x4F);
Stop();
Start();
Write(0x8F);
Stop();
}

void Start()
{
  volatile char *portf_dir=(volatile char*)0x30;
*portf_dir=0x03;
  volatile char *portf_data=(volatile char*)0x31;
  *portf_data=0x03;
  Delay();
  *portf_data&=~0x01;
  Delay();
  *portf_data=0x00;
}

void Write(char data)
{
  volatile char *portf_dir=(volatile char*)0x30;
  *portf_dir|=0x03;
  volatile char *portf_data=(volatile char*)0x31;
  for(char i=0;i<8;i++)
  {
    if((data>>i)&0x01)
    {
      *portf_data|=0x01;
    }
    else{
      *portf_data&=~0x01;
    }
      Delay();
      *portf_data|=0x02;
      Delay();
      *portf_data&=~0x02;
  }
  *portf_dir&=~0x01;
      Delay();
      *portf_data|=0x02;
      Delay();
       *portf_data&=~0x02;
   
}

void Stop()
{
    volatile char *portf_dir=(volatile char*)0x30;
  *portf_dir|=0x03;
  volatile char *portf_data=(volatile char*)0x31;
  *portf_data&=~0x02;
   Delay();
   *portf_data&=~0x01;
   Delay();
  *portf_data|=0x02;
    Delay();
  *portf_data|=0x01;
  Delay();

}

void Delay()
{
  short i;
  for( i=0;i<300;i++);
}

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

}