mikrokontrollersystemer-prosjekt/prosjekt.X/fan_speeeed.c

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

uint16_t timer_period_ms = 1;
uint16_t fan_speed;
volatile uint16_t falling_edge_counter = 0;

void TCA0_init() {
TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
TCA0.SINGLE.PERBUF = 0x0F42;
}

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() {
    fan_speed = (falling_edge_counter/timer_period_ms)*6000*3;
    falling_edge_counter= 0;
    printf("%u", fan_speed);
    return fan_speed;
}

void PORT_init(){
    PORTB.PIN2CTRL = PORT_ISC_FALLING_gc;
}



ISR ( TCA0_OVF_vect ) {
    cli();
    RPM_calculation();
    
    TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
    sei();
}

ISR(PORTB_PORT_vect){
    PORTB.INTFLAGS = PIN2_bm;
    falling_edge_counter ++;
}