tabby/avr/main.c

#include <avr/interrupt.h>

#include <tabby/clock.h>

uint16_t timer_counter_intervals[4] = {
    1953, 977, 61, 31
};

void setup_internal_clock(tabby_clock_speed speed) {
    /*
     * Enable timer interrupt vector
     */
    TIMSK = (1 << TOIE1);

    /*
     * Reset timer counter to zero
     */
    TCNT1 = 0;

    /*
     * Set timer interval
     */
    OCR1A = timer_counter_intervals[speed];

    /*
     * Set timer clock divider to 1/1
     */
    TCCR1B = (1 << CS10);
}

void setup_external_clock() {
    /*
     * Disable internal timer interrupts
     */
    TCCR1B = 0;
    OCR1A  = 0;
    TIMSK  = 0;
}

int main() {
    return 0;
}