void SPI_INIT()
{
  volatile char *dir_b,*outB,*spcr;  // initialization of portb and control register
  dir_b=0x24;// address of data direction port B 
  outB=0x25;  // Address of output port B
  spcr=0x4c;  // Address of control register 
  *dir_b=0x07; // output mode - DIN, SCK
  *outB=0x01;  // SS= 1;
  *spcr=0x51; 
}
void SPI_TRANSMIT(char ch)
{
 volatile char *spdr,*spsr;
 spsr=0x4d;
 *spsr=0x00;
 spdr=0x4e;
 *spdr=ch;

 while(!*spsr);
 delay(5);

}
void setup() {
  // put your setup code here, to run once:
  SPI_INIT();

}

void loop() 
{
  volatile char *dir_b,*outB;
  dir_b=0x24;
  outB=0x25;
  *dir_b=0x01;
  *outB=0x00;
  SPI_TRANSMIT(0x08);
  SPI_TRANSMIT(0x01);
  *outB=0x01;
}