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