#ifndef __TIMERS_H__
#define __TIMERS_H__

#ifdef MILLIS_USE_TIMERNONE
  #define DISABLE_MILLIS
#endif

#if (defined(MILLIS_USE_TIMERB0) || defined(MILLIS_USE_TIMERB1))
  #if (F_CPU==1000000UL)
    #define TIME_TRACKING_TIMER_DIVIDER   1
    #define TIME_TRACKING_TIMER_PERIOD ((F_CPU/500)-1)
  #else
    #define TIME_TRACKING_TIMER_DIVIDER   2
    #define TIME_TRACKING_TIMER_PERIOD ((F_CPU/2000)-1)
  #endif
#elif defined(MILLIS_USE_TIMERD0)
  #define TIME_TRACKING_TIMER_PERIOD    0x1FD
  #if (F_CPU==1000000UL)
    #define TIME_TRACKING_TIMER_DIVIDER    64    /* Clock divider for TCD0 */
  #else
    #define TIME_TRACKING_TIMER_DIVIDER   32    /* Clock divider for TCD0 */
  #endif
#else //Otherwise TCA0
  #define TIME_TRACKING_TIMER_PERIOD    0xFE

  #if (F_CPU==5000000UL)||(F_CPU==4000000UL)
    #define TIME_TRACKING_TIMER_DIVIDER   16
  #elif (F_CPU==1000000UL)
    #define TIME_TRACKING_TIMER_DIVIDER   8
  #else
    #define TIME_TRACKING_TIMER_DIVIDER    64    /* Clock divider for TCA0 */
  #endif
#endif


#if (defined(MILLIS_USE_TIMERD0) && F_CPU==1000000)
  #define TIMERD0_PRESCALER (TCD_CLKSEL_20MHZ_gc | TCD_CNTPRES_DIV32_gc | TCD_SYNCPRES_DIV2_gc)
#else
  //#define TIMERD0_PRESCALER (TCD_CLKSEL_20MHZ_gc | TCD_CNTPRES_DIV32_gc )

  #define TIMERD0_PRESCALER (TCD_CLKSEL_20MHZ_gc | TCD_CNTPRES_DIV32_gc)
#endif

#define TIME_TRACKING_TICKS_PER_OVF    (TIME_TRACKING_TIMER_PERIOD + 1)
#define TIME_TRACKING_CYCLES_PER_OVF  (TIME_TRACKING_TICKS_PER_OVF * TIME_TRACKING_TIMER_DIVIDER)

//For a type B timer as millis, these #defines aren't needed!

#define PWM_TIMER_PERIOD  0xFE  /* For frequency */
#define PWM_TIMER_COMPARE  0x80  /* For duty cycle */

#if defined(MILLIS_USE_TIMERA0)
  #define MILLIS_TIMER TIMERA0
#elif defined(MILLIS_USE_TIMERB0)
  #define MILLIS_TIMER TIMERB0
#elif defined(MILLIS_USE_TIMERB1)
  #define MILLIS_TIMER TIMERB1
#elif defined(MILLIS_USE_TIMERD0)
  #define MILLIS_TIMER TIMERD0
#elif defined(MILLIS_USE_TIMERRTC_XTAL)
  #define MILLIS_TIMER TIMERRTC_XTAL
#elif defined(MILLIS_USE_TIMERRTC)
  #define MILLIS_TIMER TIMERRTC
#elif defined(MILLIS_USE_TIMERNONE)
  #define MILLIS_TIMER NOT_ON_TIMER
#else
  #error "Millis timer not specified, nor is millis disabled - can't happen!"
#endif

#endif