avr/interrupts/main.c

#include <dio.h>
#include <display.h>
#include <stdbool.h>
#include <stdio.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>

dio_t light = { .ddr = &DDRC, .port = &PORTC, .pin = &PINC, .addr = 7 };
dio_t interrupt_line = { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 2 };

bool button_values[4] = { false, false, false, false };
dio_t buttons[4] = {
    { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 6 },
    { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 7 },
    { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 6 },
    { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 5 },
};


ISR(INT2_vect) {
    dio_set(&light, 1);
    for (int i = 0; i < 4; i++) {
        button_values[i] = dio_read(&buttons[i]);
    }
}

void display_buttons(display_t *display) {
    char msg[16];

    snprintf(msg, 16, ": %d %d %d %d", button_values[0], button_values[1], button_values[2], button_values[3]);
    display_clear(display);
    display_write_message(display, msg);
}

int main(void) {
    EIMSK = 1 << INT2;
    EICRA |= 1 << ISC21 | 1 << ISC20;

    display_t display = {
        .reg = {
            .output         = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 7 },
            .shift_clock    = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 6 },
            .latch_clock    = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 5 },
        }
    };
    display_init(&display);

    dio_set_direction(&light, LINE_OUT);
    dio_set_direction(&interrupt_line, LINE_IN);
    for (int i = 0; i < 4; i++) {
        dio_set_direction(&buttons[i], LINE_IN);
    }

    set_sleep_mode(SLEEP_MODE_IDLE);
    while (1) {
        display_buttons(&display);
        dio_set(&light, 0);

        sei();
        sleep_mode();
        cli();
    }

    return 0;
}