40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
/* Demo using pin-change interrupts and in-ISR debouncing routine */
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// ------- Preamble -------- //
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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#include "pinDefines.h"
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ISR(PCINT2_vect) { /* Run every time button state changes */
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if (bit_is_clear(BUTTON_PIN, BUTTON)) {
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LED_PORT |= (1 << LED1);
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}
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else {
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LED_PORT &= ~(1 << LED1);
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}
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}
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void initPinChangeInterrupt18(void) {
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PCICR |= (1 << PCIE2); /* set pin-change interrupt for D pins */
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PCMSK2 |= (1 << PCINT18); /* set mask to look for PCINT18 / PD2 */
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sei(); /* set (global) interrupt enable bit */
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}
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int main(void) {
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// -------- Inits --------- //
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LED_DDR = 0xff; /* all LEDs active */
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BUTTON_PORT |= (1 << BUTTON); /* pullup */
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initPinChangeInterrupt18();
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// ------ Event loop ------ //
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while (1) {
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_delay_ms(200);
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LED_PORT ^= (1 << LED0);
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} /* End event loop */
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return 0; /* This line is never reached */
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}
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