//#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_1 = 0;
volatile uint16_t falling_edge_counter_2 = 0;
#define MAX_PER 0x50


void init_TCA0() {
    TCA0.SINGLE.INTCTRL = TCA_SINGLE_OVF_bm ;
    TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc ; /* Sysclk /1024 */
    TCA0.SINGLE.PERBUF = 3906;
    //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 fancounter, uint16_t time) {
    fan_speed = (fancounter / time);
    fan_speed = fan_speed/2; 
    fan_speed = fan_speed * 60/5;
    fancounter = 0;
    return fan_speed;
}


void init_fanports() {
    // CONFIGURE PINS AS ANALOG INPUTS
    
    // PIN FOR FAN 1
    PORTD.DIRSET &= ~PIN6_bm;
    PORTD.PIN6CTRL &= ~ PORT_ISC_gm;
    PORTD.PIN6CTRL = PORT_ISC_INPUT_DISABLE_gc;
    
    // PIN FOR FAN 2
    PORTD.DIRSET &= ~PIN4_bm;
    PORTD.PIN4CTRL &= ~ PORT_ISC_gm ;
    PORTD.PIN4CTRL = PORT_ISC_INPUT_DISABLE_gc;
    
    // PIN FOR REFRENCE
    PORTD.DIRSET &= PIN7_bm;
    PORTD.PIN7CTRL &= ~ PORT_ISC_gm ;
    PORTD.PIN7CTRL = PORT_ISC_INPUT_DISABLE_gc;
}

void init_ac0(){ 
    //Wincontroll disabled
    AC0.CTRLB = 0x00;
    
    //SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
    // FAN USE PD6 COMPARE WITH PD3
    AC0.MUXCTRL = AC_MUXPOS_AINP3_gc | AC_MUXNEG_AINN2_gc;
    
    // ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
    AC0.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
    
    // TURN ON INTERUPT
    AC0.INTCTRL = 0x01; 
}


void init_ac1(){    
    //Wincontroll disabled
    AC1.CTRLB = 0x00;
    
    //SELECT POSITIVE AND NEGATIVE INPUTS FOR COMPARRISON
    // FAN USE PD4, COMPARE WITH PD3
    AC1.MUXCTRL = AC_MUXPOS_AINP2_gc | AC_MUXNEG_AINN2_gc;
    
    // ENABLE AC BY WRITING 1 TO ENABLE BIT IN ACN.CTRLA
    AC1.CTRLA = AC_ENABLE_bm | AC_INTMODE_NORMAL_POSEDGE_gc | AC_OUTEN_bm;
    
    // TURN ON INTERUPT
    AC1.INTCTRL = 0x01; 
}


ISR(AC0_AC_vect){ // AC0 vec flag 
    cli();
    falling_edge_counter_1++;
    AC0.STATUS |= 0x10; //CMP flag to 0
    sei();
}


ISR(AC1_AC_vect){ // AC1 vec flag 
    cli();
    falling_edge_counter_2++;
    AC1.STATUS |= 0x10; //CMP flag to 0
    sei();
}

// TIMER INTERUPT
ISR (TCA0_OVF_vect) {
    cli();
    RPM_calculation(falling_edge_counter_1,1);
    RPM_calculation(falling_edge_counter_2,1);
    falling_edge_counter_1 = 0;
    falling_edge_counter_2 = 0;
    TCA0.SINGLE.INTFLAGS = TCA_SINGLE_OVF_bm ;
    sei();
}


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