#include "spi.h"
#include <util/delay.h>



void spi_init_master() {

    SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR0);
    
    SPI_PORT |= _BV(SCK_PIN);
    SPI_DDR |= _BV(MOSI_PIN) | _BV(SCK_PIN) | _BV(SS_PIN);
   
}

uint8_t spi_transfer(uint8_t b) {

	SPDR = b;
	while (!(SPSR & _BV(SPIF)));
	return SPDR;

}