Initial commit

spi.cpp

@@ -0,0 +1,54 @@
+#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;
+}

spi.h

@@ -0,0 +1,34 @@
+#ifndef SPI_H
+#define SPI_H
+
+#include <avr/io.h>
+
+enum class SPIClock
+{
+	CLOCKDIV_4 = 0,
+	CLOCKDIV_16 = 1,
+	CLOCKDIV_64 = 2,
+	CLOCKDIV_128 = 3,
+
+	CLOCKDIV2X_2 = 4,
+	CLOCKDIV2X_8 = 5,
+	CLOCKDIV2X_32 = 6,
+	CLOCKDIV2X_64 = 7
+};
+
+enum class SPIMode
+{
+	MODE0 = 0,
+	MODE1 = 1,
+	MODE2 = 2,
+	MODE3 = 3
+};
+
+void spiInit();
+void spiEnd();
+void spiSetClockDiv( SPIClock enmClockDiv );
+void spiSetDataMode( SPIMode enmMode );
+void spiSetBitOrder( bool bLSBFirst );
+uint8_t spiTransfer( uint8_t ui8Data );
+
+#endif