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| 1 | #include "typedefs.h"
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| 2 | #include <avr/interrupt.h>
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| 3 |
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| 4 |
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| 5 | volatile U16 milisec = 0;
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| 6 | volatile U32 sec = 0;
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| 7 |
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| 8 | void timer_init() {
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| 9 | // TIMER2 is used as local clock:
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| 10 | // configure timer 2
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| 11 | TCCR2 = (1<<WGM21); // CTC Modus
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| 12 | TCCR2 |= (1<<CS21) | (1<<CS20); // Prescaler 64 --> counts up every 8us
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| 13 | OCR2 = 125-1; // --> output compare interrupt occurs every 125 x 8us = 1ms
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| 14 | // Compare Interrupt erlauben
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| 15 | TIMSK |= (1<<OCIE2);
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| 16 |
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| 17 | }
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| 18 |
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| 19 | ISR (TIMER2_COMP_vect)
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| 20 | {
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| 21 | if (milisec < 999)
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| 22 | ++milisec;
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| 23 | else {
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| 24 | milisec = 0;
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| 25 | sec++;
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| 26 | }
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| 27 |
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| 28 | }
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