/**
 * Time base
 */

#include "time_base.h"
#include "global_state.h"

#include <stdint.h>
#include <stdbool.h>
#include <avr/interrupt.h>

/// timestamp counted in units of 100ms
volatile uint16_t timestamp_100ms = 0;
/// sub-second counter, counts 0-9 then overflows
static volatile uint16_t subsec_counter = 0;

// 100ms counter
ISR(TIMER1_COMPA_vect)
{
    timestamp_100ms++;


    req_update_display = true;

    subsec_counter++;
    if (subsec_counter == 10) {
        subsec_counter = 0;
        second_callback_irq();
    }
}

void init_timebase()
{
    // CTC & presc=256
    TCCR1B = (1 << WGM12) | (1 << CS12);
    TIMSK1 = (1 << OCIE1A); // Enable CTC interrupt
    OCR1A = 6250; // 100ms
}