47 lines
962 B
C
47 lines
962 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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// czyscimy czy zapalamy
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volatile uint8_t reverse = 0;
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void update_led(){
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// przesuwamy wybrany led
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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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// zapalamy kolejna
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PORTC |= (1<<next);
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}else{
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// gasimy kolejna
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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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uint8_t last_state = ACSR & (1<<ACO);
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for(;;){
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// pobieramy stan komparatora
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uint8_t comparator_state = ACSR & (1<<ACO);
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// jesli stan sie zmienil na wysoki to przesun ledy
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if (comparator_state != last_state && last_state == 0){
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update_led();
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}
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// zaktualizuj ostatni stan
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last_state = comparator_state;
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}
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return 1;
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}
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