mca-pendel/sketches/pendulum/timer.c

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1.1 KiB
C
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#include "timer.h"
#include "timer_macros.h"
void timer_init(void)
{
//// Timer0
// prescaler
TCCR0B &= TCCRnB_CSn_CLEAR;
TCCR0B |= TCCR0B_CS0_prescale1;
// interrupt mask
TIMSK0 &= TIMSKn_ENABLE_INTERRUPT_CLEAR;
TIMSK0 |= TIMSK0_ENABLE_INTERRUPT_on_nothing;
//// Timer1
// prescaler
TCCR1B &= TCCRnB_CSn_CLEAR;
TCCR1B |= TCCR1B_CS1_prescale256;
// interrupt mask
TIMSK1 &= TIMSKn_ENABLE_INTERRUPT_CLEAR;
TIMSK1 |= TIMSK1_ENABLE_INTERRUPT_on_overflow;
SREG |= 0x80; // Status Register
// Enable global interrupts
}
void timer_reset(void)
{
TCNT0 = 0;
TCNT1 = 0;
highBits32 = 0;
highBits64 = 0;
}
ISR(TIMER1_OVF_vect)
//~ void timer_overflow(void)
{
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highBits32 += 0x01000000;
highBits64 += 0x0000000001000000;
}
uint32_t timer_now32(void)
{
uint32_t lowBits = TCNT0;
uint32_t middleBits = TCNT1;
return highBits32 | (middleBits<<8) | lowBits;
}
uint64_t timer_now64(void)
{
uint64_t lowBits = TCNT0;
uint64_t middleBits = TCNT1;
return highBits64 | (middleBits<<8) | lowBits;
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}