56 lines
1.0 KiB
C
56 lines
1.0 KiB
C
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#include <avr/io.h>
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#include <avr/interrupt.h>
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volatile uint8_t button_reset_counter;
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volatile uint8_t button_press_count;
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// decrease reset_counter until 0
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ISR(TIMER2_OVF_vect)
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{
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button_reset_counter -= button_reset_counter == 0 ? 0 : 1;
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}
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// update press_counter on interrupt if reset == 0
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ISR(PCINT2_vect){
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if (button_reset_counter == 0){
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button_press_count++;
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button_reset_counter = 20;
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if(button_press_count % 2 == 0){
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PORTD &= ~(1<<5);
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}else{
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PORTD |= (1<<5);
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}
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}
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}
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int main(void) {
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// C7 as input for external interrupt
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DDRC &= ~_BV(DDC7);
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PORTC |= _BV(PORTC7);
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// D5 as output
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DDRD = _BV(PD5);
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PORTD = _BV(PD5);
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// TIMER 2 setup
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TCCR2B |= _BV(CS22) | _BV(CS21) | _BV(CS20);
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TIMSK2 |= _BV(TOIE2);
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cli();
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// rising edge interrupt on INT2
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EICRA |= _BV(ISC20);
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EIMSK |= _BV(INT2);
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// enable external interrupt for pin 23 - PC7
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PCMSK2 |= _BV(PCINT23);
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PCICR |= _BV(PCIE2);
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sei();
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for(;;){}
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return 0;
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}
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