#include <DS3232RTC.h> // https://github.com/JChristensen/DS3232RTC

DS3232RTC rtc;

volatile uint32_t counter = 0;
volatile uint32_t counter2 = 0;

void isr_32768hz()
{
    ++counter;
}

void isr_sqw()
{
    ++counter2;
}

void setup()
{
    Serial.begin( 115200 );
    attachInterrupt( digitalPinToInterrupt( 2 ), isr_32768hz, FALLING );
    attachInterrupt( digitalPinToInterrupt( 3 ), isr_sqw, FALLING );
    
    rtc.begin();

    /*rtc.squareWave( DS3232RTC::SQWAVE_1_HZ );
    rtc.squareWave( DS3232RTC::SQWAVE_1024_HZ );
    rtc.squareWave( DS3232RTC::SQWAVE_4096_HZ );
    rtc.squareWave( DS3232RTC::SQWAVE_8192_HZ );
    rtc.squareWave( DS3232RTC::SQWAVE_1_HZ );
    rtc.squareWave( DS3232RTC::SQWAVE_NONE );
    rtc.squareWave( DS3232RTC::SQWAVE_1_HZ );*/

    rtc.set( 1664154792 );
    /*delay( 1000 );
    Serial.println( rtc.get() );
    delay( 1000 );

    rtc.set( 1664254792 );
    delay( 1000 );
    Serial.println( rtc.get() );
    delay( 2000 );*/
}

void loop()
{
    uint32_t now = millis();
    static uint32_t past = now;

    if ( now - past >= 1000 )
    {
        past = now;

        //time_t now_rtc = rtc.get();
        //Serial.println( now_rtc );
        //Serial.println( counter * 1000000.0 / micros() );
        //Serial.println( counter2 * 1000000.0 / micros() );

        Serial.println( counter );
        Serial.println( counter2 );
        counter = 0;
        counter2 = 0;
    }

    /*if ( counter >= 32768 )
    {
        Serial.println( now - past );
        past = now;
        counter = 0;
    }*/

    /*if ( counter2 >= 8192 )
    {
        Serial.println( now - past );
        past = now;
        counter2 = 0;
    }*/
}