xmega_spi.h

#ifndef __XMEGA_SPI_H__
#define __XMEGA_SPI_H__

#include <avr/io.h>
#include <stdint.h>

/*
        CLK2X                   |      0 |      1 |
        -------------------------------------------------
        SPI_PRESCALER_DIV4_gc   |   /4   |    /2  |
        SPI_PRESCALER_DIV16_gc  |   /16  |    /8  |
        SPI_PRESCALER_DIV64_gc  |   /64  |    /32 |     
        SPI_PRESCALER_DIV128_gc |   /128 |    /64 |
*/

#ifndef SPI_PRESCALER_DIV2_gc
        #define SPI_PRESCALER_DIV2_gc (SPI_PRESCALER_DIV4_gc | SPI_CLK2X_bm)
#endif

#ifndef SPI_PRESCALER_DIV8_gc
        #define SPI_PRESCALER_DIV8_gc (SPI_PRESCALER_DIV16_gc | SPI_CLK2X_bm)
#endif

#ifndef SPI_PRESCALER_DIV32_gc
        #define SPI_PRESCALER_DIV32_gc (SPI_PRESCALER_DIV64_gc | SPI_CLK2X_bm)
#endif


#endif // #ifndef __XMEGA_SPI_H__