void timer_init(void)
{
TIMER_SET_PRESCALER(TIMER_PRESCALER_64);
TIMER_DISABLE_ON_FREEZE();
TIMER_FANCY_FAST_CLEAR();
TIMER_ENABLE();
CLR_BITS(TIE, (TIE_C3I_MASK));
}
int timer_set_prescaler(const uint8_t timer, const timer_prescaler prescaler)
{
uint8_t scaler = 0;
// Calculate prescaler bit-combination depending on available prescalers
switch (timer)
{
case 0:
case 1:
case 3:
case 4:
case 5:
scaler = TIMER_MASK_PRESCALER_NORMAL(prescaler);
break;
case 2:
scaler = TIMER_MASK_PRESCALER_FINE(prescaler);
break;
default:
return TIMER_ERROR_INVALID_TIMER;
}
// Check if prescaler combination is valid
if (scaler || prescaler == TPS_DISABLED)
{
// Set new prescaler value
switch (timer)
{
case 0:
TIMER_SET_PRESCALER(TCCR0B, scaler);
break;
case 1:
TIMER_SET_PRESCALER(TCCR1B, scaler);
break;
case 2:
TIMER_SET_PRESCALER(TCCR2B, scaler);
break;
case 3:
TIMER_SET_PRESCALER(TCCR3B, scaler);
break;
case 4:
TIMER_SET_PRESCALER(TCCR4B, scaler);
break;
case 5:
TIMER_SET_PRESCALER(TCCR5B, scaler);
break;
}
return TIMER_ERROR_SUCCESS;
}
else
return TIMER_ERROR_INVALID_OPERATION;
}