SPI using AVR:

SPI using AVR:

Program for SPI (MOSI):

Master:

#include<avr/io.h>
#include<util/delay.h>
void main()
{
DDRB=0xAC;
SPCR=0x70;
while(1)
{
SPDR=0xf0;
while((SPSR&0x80)==0);


}
}


Slave:


#include<avr/io.h>
#include<util/delay.h>
void main()
{
DDRD=0xFF;
//DDRB=0X40;
SPCR=0x70;
while(1)
{
while((SPSR&0x80)==0);
PORTD=SPDR;
}
}

Simulation for MOSI:

Program for SPI (MISO):

Master:

 #include<avr/io.h>
#include<util/delay.h>
void main()
{
while(1)
{
DDRB=0x2C;
SPCR=0x70;
SPDR=0x55;
while((SPSR&0x80)==0);
DDRB=0x34;
DDRD=0xFF;
SPCR=0x50;
while((SPSR&0x80)==0);
PORTD=SPDR;
while(1);
}
}


Slave:


 #include<avr/io.h>
#include<util/delay.h>
void main()
{
while(1)
{
DDRD=0xFF;
SPCR=0x40;
while((SPSR&0x80)==0);
PORTD=SPDR;
DDRB=0x10;
SPCR=0x60;
SPDR=0x55;
while((SPSR&0x80)==0);
while(1);
}
}