#include "fan_speeeed.h"
#include "uart.h"

uint16_t timer_period_ms = 1;
uint16_t fan_speed;
volatile uint16_t falling_edge_counter = 0;
#define MAX_PER 0x50

void init_TCA0() {
    
    //code 
    PORTMUX.TCAROUTEA = PORTMUX_TCA0_PORTD_gc; 
    // port d ??? why 
    PORTD.DIR = PIN0_bm; 
    //code 
    //TCA0.SINGLE.PERBUF = MAX_PER; 
    TCA0.SINGLE.PERBUF = (F_CPU * (1 / timer_period_ms) / 1024); /* F_CPU * F_IRQ / TCA_prescaler */
    TCA0.SINGLE.CMP0BUF = MAX_PER/2;
    TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_bm | 0x03;
    TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc | TCA_SINGLE_ENABLE_bm;
    
    //TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm;
    //TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc; /* Sysclk /1024 */
    //TCA0_update_period_ms();
}

void TCA0_update_period_ms() {
    TCA0.SINGLE.PERBUF = (F_CPU * (1 / timer_period_ms) / 1024); /* F_CPU * F_IRQ / TCA_prescaler */
}

uint16_t RPM_calculation(uint16_t test, uint16_t time) {
    fan_speed = (test / time)*6000 * 3;
    falling_edge_counter = 0;
    printf("%u", fan_speed);
    return fan_speed;
}




void PORTB_init() {
    PORTA.OUTSET |= PIN5_bm;
    PORTA.DIRSET |= PIN5_bm;
}

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