#include "fan speeeed.h"
RTC.PITCTRLA = RTC_PERIOD_CYC32768_gc | RTC_PITEN_bm;

int RTC_init() {
    uint8_t temp;
    /* Initialize 32.768kHz Oscillator: */
    /* Disable oscillator: */
    temp = CLKCTRL.XOSC32KCTRLA;
    temp &= ~CLKCTRL_ENABLE_bm;
    /* Writing to protected register */
    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);

    while (CLKCTRL.MCLKSTATUS & CLKCTRL_XOSC32KS_bm) {
        ; /* Wait until XOSC32KS becomes 0 */
    }
    /* SEL = 0 (Use External Crystal): */
    temp = CLKCTRL.XOSC32KCTRLA;
    temp &= ~CLKCTRL_SEL_bm;
    /* Writing to protected register */
    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);

    /* Enable oscillator: */
    temp = CLKCTRL.XOSC32KCTRLA;
    temp |= CLKCTRL_ENABLE_bm;
    /* Writing to protected register */
    ccp_write_io((void*) &CLKCTRL.XOSC32KCTRLA, temp);

    /* Initialize RTC: */
    while (RTC.STATUS > 0) {
        ; /* Wait for all register to be synchronized */
    }
    /* 32.768kHz External Crystal Oscillator (XOSC32K) */
    RTC.CLKSEL = RTC_CLKSEL_TOSC32K_gc;
    /* Run in debug: enabled */
    RTC.DBGCTRL = RTC_DBGRUN_bm;

    RTC.PITINTCTRL = RTC_PI_bm; /* Periodic Interrupt: enabled */

    RTC.PITCTRLA = RTC_PERIOD_CYC32768_gc /* RTC Clock Cycles 32768 */
            | RTC_PITEN_bm; /* Enable: enabled */

}
// skal lage en som finner data hvert ... sekund. Datane skal samles inn i en array. Når arrayen er full skal jeg regne ut rpm. Vet t det er ... mange sek mellom så blir enklere. så noe signalbehandling shit.
int read_array_get_RPM(int voltage_value) {
    
    f = ((1 / t)*1000);
    fan_speed = (f * 60) / 2;
    return fan_speed;
}

inline void put_in_array() {
    int voltage_value [30] = {};
    for(int i = 0; i <30; i++)
        scanf("%d", &voltage_value[i]);
    
}

ISR(RTC_PIT_vect) {
    RTC.PITINTFLAGS = RTC_PI_bm;
    
    put_in_array();
}

int main(void) {
    sei();
    read_array_get_RPM();
    RTC_init();
    while (1) {

    }
}