#include <xc.h>
#include "driver.h"

     


// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

// CONFIG1
#pragma config FOSC = INTRC_NOCLKOUT// Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register)
#pragma config PWRTE = OFF       // Power-up Timer Enable bit (PWRT enabled)
#pragma config MCLRE = ON       // RE3/MCLR pin function select bit (RE3/MCLR pin function is MCLR)
#pragma config CP = OFF         // Code Protection bit (Program memory code protection is disabled)
#pragma config CPD = OFF        // Data Code Protection bit (Data memory code protection is disabled)
#pragma config BOREN = ON       // Brown Out Reset Selection bits (BOR enabled)
#pragma config IESO = ON        // Internal External Switchover bit (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)
#pragma config LVP = OFF        // Low Voltage Programming Enable bit (RB3 pin has digital I/O, HV on MCLR must be used for programming)

// CONFIG2
#pragma config BOR4V = BOR40V   // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V)
#pragma config WRT = OFF        // Flash Program Memory Self Write Enable bits (Write protection off)


#define SHD PORTDbits.RD7

unsigned char cnt1=0, cnt2=0, ones=0;


//Programa za skanirane na towa dali ima tag w obxwata na antenata
//Tag ima kogato chestotata na INT pina e 2KHz
//Celta e da se xwanat dwa padashti predni fronta (na 2 KHz) za 132 RF perioda
unsigned char detect (void)
{
    while(cnt2<2); //izchakai 2 perioda na TOCKI pina
    if(cnt1==2 && cnt2==2) //ako w edin i sashti moment e izpalneno uslowieto
    {
        //PORTDbits.RD2=1;
        cnt1=0;
        cnt2=0;
        return 1;
    }
    else
    {
        //PORTDbits.RD2=0;
        cnt1=0;
        cnt2=0;
        return 0;
    }
}

void read (void) //procheti header-a
{
    for(unsigned char i=0;i<9;i++)
    {
        while(cnt2<1);
            if(cnt1==1)
            {
                ones++;
            }
            cnt2=0;
            cnt1=0;
    }
    if(ones==9)
    {
        PORTDbits.RD3=1;
    }
    else
    {
        PORTDbits.RD3=0;
    }
    ones=0;
}

void main (void)
{
    init();
    //EM4095 initialization
    SHD = 1;
    SHD = 0;
    while(cnt2<70);
    PORTDbits.RD3=0;
    PORTDbits.RD2=0;
    cnt2=0;
    while(1)
    {
        detect();
        if(detect()==1)
        {
        PORTDbits.RD2=1;
        while(cnt2<62); //izchakai 62 cikala, poneje w detect weche sa minali 2 cikala
                        //(poneje kartata e 64 bitowa), za da zapochne cheteneto ot 1wi bit
        cnt2=0;
        cnt1=0;
        read();
        }
        else
        {
            PORTDbits.RD2=0;
        }
    }

}


//Interrupt routine
void interrupt Isr(void)
{
    if (INTE && INTF) //Interrupt on INT pin 2khz
    {
        cnt1++;
        INTF=0;
    }
    if(T0IE && T0IF) //Interrupt on T0CKI pin 125khz
    {
        TMR0=190; //256-190=66 perioda
        cnt2++;
        T0IF=0;
    }
}