#include <avr/io.h>

#include "lib/mystd.h"
#include "lib/spi.h"

void spi_init(void) {
	// set the correct pins as output
	SPI_DDR |= BV(CS) | BV(MOSI) | BV(SCK);

	// enable SPI, set as master, and clock to fosc/128
	SPCR	 = BV(SPE) | BV(MSTR) | BV(SPR1) | BV(SPR0);
}

void spi_uninit(void) {
	SPCR = 0;
}

t_error spi_write(uint8_t data) {
	uint16_t o = 0;

	// load data into register
	SPDR	   = data;

	// Wait for transmission complete
	while (!(SPSR & BV(SPIF)) && o < 32768)
		o++;
	if (o >= 32768)
		return ERROR;

	return NO_ERROR;
}