51 lines
684 B
C
51 lines
684 B
C
#include<avr/io.h>
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#include <avr/interrupt.h>
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volatile uint8_t id;
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volatile uint8_t state;
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volatile int8_t dir = -1;
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ISR(TIMER2_OVF_vect)
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{
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if(state == 0){
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PORTC &= ~(1<<id);
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}else{
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PORTC |= (1<<id);
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id = (id + dir) % 8;
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}
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state = (state+1) % 2;
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}
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ISR(PCINT1_vect){
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if(dir == 1)
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dir = -1;
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else
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dir = 1;
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}
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int main(void) {
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DDRC = (0xff);
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PORTC = (0xff);
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DDRB &= ~_BV(DDB0);
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PORTB |= _BV(PORTB0);
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// timer int
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TCCR2B |= _BV(CS22) | _BV(CS21) | _BV(CS20);
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TIMSK2 |= _BV(TOIE2);
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EICRA |= _BV(ISC11) | _BV(ISC10);
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EIMSK |= _BV(INT1);
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// enable for pin 8 - PB0
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PCMSK1 |= _BV(PCINT8);
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PCICR |= _BV(PCIE1);
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sei();
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for(;;);
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return 0;
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}
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