xmega_clock.h

#ifndef __XMEGA_CLOCK_H__
#define __XMEGA_CLOCK_H__

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

// we might even allow higher CPU frequencies here - NOT TESTED

#if F_CPU == 32000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     16
#elif F_CPU == 30000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     15
#elif F_CPU == 28000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     14
#elif F_CPU == 26000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     13
#elif F_CPU == 24000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     12
#elif F_CPU == 22000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     11
#elif F_CPU == 20000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     10
#elif F_CPU == 18000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     9
#elif F_CPU == 16000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     8
#elif F_CPU == 14000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     7
#elif F_CPU == 12000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     6
#elif F_CPU == 10000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     5
#elif F_CPU == 8000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     4
#elif F_CPU == 6000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     3
#elif F_CPU == 4000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     2
#elif F_CPU == 2000000UL
        #define XMEGA_CLOCK_CONF_PLL_FACTOR     1
#else
        #error CPU Frequence Unknown
#endif

void xmega_clock_output(void);
void xmega_clock_init(void);


#endif // #ifndef __XMEGA_CLOCK_H__