23 lines
355 B
C
23 lines
355 B
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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static volatile unsigned long timerMillis = 0;
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void timerInit() {
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TCCR1B |= (1 << WGM12) | (1 << CS11) | (1 << CS10);
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OCR1A = 249;
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TIMSK1 |= (1 << OCIE1A);
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sei();
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}
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unsigned long millis() {
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unsigned long ms;
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cli();
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ms = timerMillis;
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sei();
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return ms;
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}
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ISR(TIMER1_COMPA_vect) {
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timerMillis++;
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} |