spi.c

AVR Devolpment Board

#include "avr/io.h"


void SPI_Init(void)
{
	DDRB|= (1<<PB4)|(1<<PB5)|(1<<PB7);    /* PB4:SS  PB5:MOSI  PB6:MISO  PB7:SCK */
	DDRB&=~(1<<PB6);
	SPCR=(1<<SPE)|(1<<MSTR)|(1<<CPOL)|(1<<CPHA)|(0<<SPR1)|(SPR0);
	SPSR = (1<<SPI2X);
}

unsigned char SPI_RW(unsigned char Data)
{
	SPDR=Data;
	while(!(SPSR&0x80));
	Data=SPDR;
	return Data;			
}