master_1

#include <avr/io.h>
#include <util/delay.h>

void spi_init_master(void)
{
    DDRB=0xA0;
    SPCR=(1<<SPE)|(1<<MSTR)|(1<<SPR0);

}

unsigned char spi_transmitrecieve(unsigned char data1)
{

    SPDR= data1;
    while(!(SPSR &(1<<SPIF)));

    return(SPDR);

}





int main(void)
{


    spi_init_master();

    DDRC=0xFF;
    PORTC=0;
    //PORTB|=(1<<PINB4);

    DDRA=0xFF;


    unsigned char i;
    unsigned char k1;

    while(1)
    {

        for(i=0;i<10;i++)
        {
            PORTA=0xFF;

            if((i%2)==0)
            {
              PORTA &=~(1<<PA2); //turning on slave 2

              k1=spi_transmitrecieve(i);



              PORTC= k1;

             _delay_ms(500);
             PORTA |=(1<< PA2); // turning off slave 2


            }


            else
            {
                   PORTA &=~(1<<PA1);// turning on slave 1

                   k1=spi_transmitrecieve(i);



                   PORTC= k1;

                 _delay_ms(500);
                PORTA |=(1<<PA1); // turning off slave 1
            }



        }


    }

}