Infinity loop

Measuring CO₂

TIMER(timer0, 5000)
{
    timer0 = millis();
    PRINT_DEBUG(F("Measured CO2 "));
    …
}

Reads PPM and writes it into the global array. To save time, it don't shifts array, but increments element counter that points to the fresh ppm value. Values which measured at first 3 minutes after boot are ignored.

Notifications

TIMER(timer2, HIGH_PPM_TIMEOUT)
{
    …
}

Asks for a long beep. There is no function that reads this intent.

Update time from RTC

TIMER(timer3, 999)
{
    PRINT_DEBUG(F("Time updated "));
    …
}

Every last millisecond it continuously updates time every cycle pass until seconds variable changes. Also formats it to the defined time format.

Swipe panel poll

static uint32_t timer4 = 0;
TIMER(timer4, 10)
{
    timer4 = millis();
    PRINTLN_DEBUG(F("Buttons readed"));
    buttons(0);
}

This timer calls if spaghetti function. I'll be glad if someone will help me with tidying it. Function detects the event and writes it to the global variables. Screens have to null every event's boolean after reading (or rendering to ignore input).

Pomodoro

if(globalVars.pomodoroRunning) TIMER(globalVars.pomodoroTimer, 1000)
{
    globalVars.pomodoroTimer = millis();
    …
}

Updates pomodoro timer every second and changes work/break states. Not depends on RTC.

Sleep

TIMER(timer5, 30000) 
{
    if(!globalVars.noAutoChangeScreen && globalVars.currentScreen != homeScreen)
    {
        matrix.clear();
        globalVars.currentScreen = homeScreen;
        globalVars.currentState = 0;
    }
}
else globalVars.sleep = false;

Render

switch(globalVars.prepare)
{
    …
}
matrix.show();

Calls current screen's function and updates display. Calls animate in the transition.

millis() reset

TIMER(0, 3456000000)
{
    PRINTLN_DEBUG(F("Timers reset"));
    noInterrupts();
        timer0_millis = 0;
        timer0_overflow_count = 0;
    interrupts();
    …
}

Classical timer realization implies that millis() always greater than last memorized time. But system timer0_millis is not infinite, it nulls after UINT32_MAX, which means it will work 1 month 19 days 17 hours 2 minutes 47 seconds 295 milliseconds. This timer resets all timers every month.