68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
/*
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* P2 Interrups.c
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*
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* Created: 11.11.2023 21:07:41
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* Author : Safak
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*/
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#include <avr/io.h>
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#define F_CPU 16000000UL
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <stdbool.h> // boolean type and values
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#define LED0 PINB0
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#define LED9 PINB1
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#define SW1 PIND2
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#define SW2 PIND3
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volatile int activeLED = LED0;
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volatile bool blink = true;
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void setupPorts() {
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DDRB = 0xff;
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PORTB = 0x00;
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DDRD = 0x00;
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PORTD |= (1 << SW1) | (1 << SW2); // Activate pull-up resistors
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// Falling edge of INT0 and INT1 generates an interrupt request
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EICRA |= (1 << ISC11) | (1 << ISC01);
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EIMSK |= (1 << INT0) | (1 << INT1); // Enable external interrupt request
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sei(); // Set global interrupt enable
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}
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// SW1 is pressed
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ISR(INT0_vect) {
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if (activeLED == LED0) { // if D0 is already on, switching from blink to steady light or vice versa
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blink = !blink;
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}
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else { // else D9 is on, turn off D9 and turn on D0
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PORTB = (1 << LED0);
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}
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activeLED = LED0;
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}
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// SW2 is pressed
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ISR(INT1_vect) {
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if (activeLED == LED9) {
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blink = !blink;
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}
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else {
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PORTB = (1 << LED9);
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}
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activeLED = LED9;
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}
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int main(void) {
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setupPorts();
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while (1) {
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if (blink) {
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PORTB ^= (1 << activeLED); // Toggle active LED
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}
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_delay_ms(50);
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}
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} |