#include <mega8535.h>
// MCP23S17 SPI Slave Device
#define SPI_SLAVE_ID	0x40
#define SPI_SLAVE_ADDR  0x00	 
#define SPI_SLAVE_WRITE 0x00
#define SPI_SLAVE_READ  0x01// MCP23S17 Registers Definition for BANK=0 (default)
#define IODIRA 0x00
#define IODIRB 0x01
#define IOCONA 0x0A
#define GPPUA  0x0C
#define GPPUB  0x0D
#define GPIOA  0x12
#define GPIOB  0x13


#define SPI_CS 0
// SPI functions
#define SPI_ACTIVE_SS(PORT,SPI_CS) PORT &= ~(1<<SPI_CS);
#define SPI_UNACTIVE_SS(PORT,SPI_CS) PORT |= (1<<SPI_CS);
// Declare your global variables here

void SPI_write(unsigned char addr,unsigned char data)
{
SPI_ACTIVE_SS(PORTB,0);
SPDR = SPI_SLAVE_ID | ((SPI_SLAVE_ADDR << 1) & 0x0E)| SPI_SLAVE_WRITE;
while(!(SPSR & (1<<SPIF)));
SPDR = addr;
while(!(SPSR & (1<<SPIF))); 
SPDR = data;
while(!(SPSR & (1<<SPIF)));
SPI_UNACTIVE_SS(PORTB,0);
}

interrupt [TIM2_OVF] void timer0_ovf(void)
{

   TCNT2=200;





}
void main(void)
{

PORTA=0x01;
DDRA=0x00;


DDRB=0xB1;


ASSR=0x00;
TCCR2=0x07;
TCNT2=200;
OCR2=0x00;

TIMSK=(1<<TOIE2);

ACSR=0x80;
SFIOR=0x00;

SPCR=0x50;
SPSR=0x00;

  SPI_write(IOCONA,0x20);   // I/O Control Register: BANK=0, SEQOP=1, HAEN=1 (Enable Addressing)
  SPI_write(IODIRA,0x00);   // GPIOA As Output
//SPI_Write(IODIRB,0xFF);   // GPIOB As Input
//SPI_Write(GPPUB,0xFF);	// Enable Pull-up Resistor on GPIOB
  SPI_write(GPIOA,0x00);
#asm("sei")
while(1)
	  {
	 if (!(PINA&0x01)){
	 SPI_write(GPIOA ,0x01);
	 }
	 else
	 SPI_write(GPIOA ,0x00);
	  }

}

while(1)
	  {

		SPI_write(GPIOA ,0x01);
		SPI_write(GPIOA ,0x00);

	  }

}