// SD Controller for Computer "Specialst"
// (c) 26-05-2013 vinxru (aleksey.f.morozov@gmail.com)

// Based on sources CC Dharmani, Chennai (India)
// 1 May 2013 vinxru
#ifndef F_CPU
#define F_CPU 16000000ULL
#endif
#include "spi.h"
#include <util/delay.h>
#include <avr/io.h>
#ifndef SPI2X
#define SPI2X 0
#endif

void spi_init(void)
{
	DDRB  = 0xF7;	//
	PORTB = 0xF7;	//
	SPCR = 0x52; // setup SPI: Master mode, MSB first, SCK phase low, SCK idle low
	SPSR = 0x00;
}

uint8_t spi_transmit(uint8_t data)
{
	SPDR = data;
	while(!(SPSR & 0x80)); // Wait for transmission complete
	return SPDR;
}

uint8_t spi_receive()
{
	SPDR = 0xFF;
	while(!(SPSR & 0x80)); // Wait for reception complete
	return SPDR;
}

void spi_highSpeed()
{
	SPCR = 0x50;
	SPSR |= (1<<SPI2X);
	_delay_ms(1);
}