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time is working

This commit is contained in:
Daniel Knüttel 2019-01-17 19:39:21 +01:00
parent ac2d26bd65
commit fa096c7ce0
2 changed files with 30 additions and 15 deletions
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29
time.c
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@ -4,25 +4,34 @@
#include <avr/interrupt.h>
#include <avr/io.h>
volatile unsigned int _eigentime_ms;
volatile struct eigentime_s _eigentime_ms;
void
time_init(void)
{
_eigentime_ms = 0;
TCCR1B = _BV(CS10);
OCR1A = TIMER1_COMPA_VALUE;
TIMSK |= _BV(OCIE1A);
_eigentime_ms.low = 0;
_eigentime_ms.high = 0;
// prescaler is 64.
TCCR0B = _BV(CS00) | _BV(CS01);
TIMSK0 |= _BV(TOIE0);
sei();
}
unsigned int
get_eigentime(void)
void
get_eigentime(struct eigentime_s * time)
{
return _eigentime_ms;
time->low = _eigentime_ms.low;
time->high = _eigentime_ms.high;
}
ISR(TIMER1_COMPA_vect)
ISR(TIMER0_OVF_vect)
{
_eigentime_ms++;
unsigned int last_eigentime_low = _eigentime_ms.low;
_eigentime_ms.low += TIME_MILLIS_PER_OVERFLOW;
// Handle the overflow.
if(_eigentime_ms.low < last_eigentime_low)
{
_eigentime_ms.high++;
}
}

16
time.h
View File

@ -2,13 +2,19 @@
#define _TIME_H_
#include "conf.h"
#define TIMER1_MAX_VALUE 0xffff
#define TIMER1_COMPA_VALUE (TIMER1_MAX_VALUE / F_CPU)
// This is 2.04 = 2ms
#define TIME_MILLIS_PER_OVERFLOW (0xff * 1000UL * 64) / F_CPU
extern volatile unsigned int _eigentime_ms;
// for 32bit eigentime
struct eigentime_s
{
unsigned int low, high;
};
unsigned int
get_eigentime(void);
extern volatile struct eigentime_s _eigentime_ms;
void
get_eigentime(struct eigentime_s * time);
void
time_init(void);