mikrokontrollersystemer-prosjekt/prosjekt.X/fan_speeeed.c

#include <avr/ioavr128db48.h>

#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;
}
// Voltage reference
#define VDACREF 
#define VREF 
#define DACREF_VALUE (VDACREF * 256 / VREF)


void init_ac(){
    // CONFIGURE PINS AS ANALOG INPUTS
    PORTD.PIN2CTRL = PORT_ISC_INPUT_DISABLE_gc;
    
    // SET BENCH MARK
    
    
    //SELECT POSITIVER INPUTS muxs
    AC0.MUXCTRLA = AC_MUXPOS_AINP0_gc | AC_MUXNEG_DACREF_gc;
    
    // OPTIONAL: ENABLE INNPUT PIN BY WRITING "1" TO OUTEN
    AC0.CTRLA = 0x40; // 0b01000000
    
    // ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
    AC0.CTRLA |= PIN0_bm; // 0b00000001
    AC0.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
    
    // SET CMP TO 1
    AC0.INTCTRL = 0x01; 
}

ISR(AC0_AC_vect){ // AC0 vec flag 
    AC0.STATUS |= 0x10; //CMP flag to 0. 
}

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