#include "spi.h"

void spiInit()
{
	SPCR |= ( 1 << SPE ) | ( 1 << MSTR );
}

void spiEnd()
{
	SPCR = 0;
	SPSR = 0;
}

void spiSetClockDiv( SPIClock enmClockDiv )
{
	bool bSPI2X = ( static_cast<uint8_t>( enmClockDiv ) >> 2 ) & 1;
	bool bSPR1 = ( static_cast<uint8_t>( enmClockDiv ) >> 1 ) & 1;
	bool bSPR0 = ( static_cast<uint8_t>( enmClockDiv ) >> 0 ) & 1;

	SPCR &= ~( 1 << SPR1 | 1 << SPR0 );
	SPSR &= ~( 1 << SPI2X );

	SPCR |= ( bSPR1 << SPR1 | bSPR0 << SPR0 );
	SPSR |= ( bSPI2X << SPI2X );
}

void spiSetDataMode( SPIMode enmMode )
{
	bool bCPOL = ( static_cast<uint8_t>( enmMode ) >> 1 ) & 1;
	bool bCPHA = ( static_cast<uint8_t>( enmMode ) >> 0 ) & 1;

	SPCR &= ~( 1 << CPOL | 1 << CPHA );

	SPCR |= ( bCPOL << CPOL | bCPHA << CPHA );
}

void spiSetBitOrder( bool bLSBFirst )
{
	if( bLSBFirst )
	{
		SPCR |= ( 1 << DORD );
	}
	else
	{
		SPCR &= ~( 1 << DORD );
	}
}

uint8_t spiTransfer( uint8_t ui8Data )
{
	SPDR = ui8Data;
	while( !( SPSR & ( 1 << SPIF ) ) );
	return SPDR;
}