spi2.c

/* 23/2/2011  svn 282  */


// this library only requires the definitions of registers in the Atmel.
/******************		
******************
	IMPORTANT
		The spi function built in to the Microcontroller needs to
		be initialised before the device is used. Use the init_spi() funtion in spi2.h
******************		
******************/		

#include <avr/io.h>
#include "spi2.h"



inline void init_spi(uint8_t rate) {
	SPCR = (1<<SPE) | (1<<MSTR) | (rate & 0x03) ;
}


inline void xmit_spi(uint8_t dat) {
	SPDR=dat;
	while(!(SPSR & (1<<SPIF)))
		;
}


inline uint8_t recv_spi(void) {
	SPDR = 0xFF;
	while(!(SPSR & (1<<SPIF)))
		;
	return SPDR;
}