51 lines
681 B
C
51 lines
681 B
C
#include <stdbool.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include "config.h"
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uint32_t ms_since_boot = 0;
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ISR(TIM1_COMPA_vect)
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{
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ms_since_boot++;
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}
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void setupio(void) {
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// Set port A to inputs
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DDRA = 0x00;
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PORTA |= PORTA0 | PORTA1; // pull-up
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// Set port B0 to output
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DDRB = 0x01;
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}
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void setup_clock(void) {
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OSCCAL = OSCILLATOR_CALIBRATION;
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TCCR1B = 0x09;
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OCR1A = 1000;
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TIMSK1 = 0x02;
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}
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bool button_pressed(uint8_t pin) {
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return (PINA & (1 << pin)) == 0;
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}
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int main() {
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setupio();
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setup_clock();
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sei();
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while(true) {
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uint32_t sec = ms_since_boot / 1000;
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if(sec % 2 == 0) {
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PORTB = 1;
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} else {
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PORTB = 0;
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}
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}
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}
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