39 lines
627 B
C
39 lines
627 B
C
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#include <avr/io.h>
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#include <avr/interrupt.h>
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volatile uint8_t current_led = 3;
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volatile uint8_t reverse = 0;
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ISR(ANALOG_COMP_vect){
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uint8_t next = current_led + 1;
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if (next > 3){
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next = 0;
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reverse = (reverse + 1) % 2;
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}
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if (!reverse){
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PORTC |= (1<<next);
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}else{
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PORTC &= ~(1<<next);
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}
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current_led = next;
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}
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int main(void){
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// ustawienie C0-C3 jako wyjscie
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DDRC |= 0b00001111;
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// wylaczenie interrupow
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cli();
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// wlaczenie interrupu na komparator
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ACSR |= (1<<ACIE);
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// wlaczenie interrupow
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sei();
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for(;;);
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return 1;
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}
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