Hello,guys I have a code for LC meter using nokia 3310 display and PIC16F876A microcontroller using MPLAB . Which is written by some other person.

#include "main.h"
#include "lcd3310.h"
#include "display.h"

void main(void)
{
    int i;
    initialize();
    lcd_gotoxy(0,0);
    //show startup logo
    for(i=0; i<504; i++)    lcd_send(logo_image[I], LCD_TDATA);
    lcd_gotoxy(40,5);
    lcd_puts("YUS'09");
    delay10ms(200);
    calibrate();
    lcd_clear();

    while(1)
    {
        if(LC_select)    measure_capacitance();
        else            measure_inductance();
        indicator(1);
        delay10ms(30);
        indicator(0);
        delay10ms(20);
    }
}
void initialize(void)
{
    //setup comparator
    CMCON = 0b00000101;
    TRISA = 0b11001111;
    //setup timer0 for frequency counter
    T0CS = 1;    //Transition on T0CKI pin
    T0SE = 1;    //Increment on high-to-low transition on T0CKI pin
    PSA = 0;    //Prescaler is assigned to the Timer0 module
    PS2 = 1;    //PS2S0 -> Prescaler Rate = divide by 256
    PS1 = 1;
    PS0 = 1;
    //initialize 3310 lcd
    lcd_init();
    lcd_clear();
    //others
    lc_tris();
    [B][COLOR=#ff0000]relay_tris();[/COLOR][/B]
    [B][COLOR=#ff0000]RBPU = 0; [/COLOR][/B]       // enable portB internal pullup
}
unsigned int measure_freq(void)        //16-bit freq
{
    unsigned int oldTMR0, prescaler_cntr;
    TMR0IF = 0;        //clear timer0 interrupt flag
    TRISA4 = 0;        //Enable RA4 output to T0CKI
    delay10ms(2);            //stablize oscillator
    TMR0 = 0x00;            //reset timer0 counter (including prescaler)
    delay10ms(10);
    TRISA4 = 1;        //Disable RA4 output to T0CKI
    oldTMR0 = TMR0;
    prescaler_cntr=0;
    do{    //self-clocking
        T0SE = 1;
        [B][COLOR=#ff0000]NOP();    NOP();[/COLOR][/B]
        T0SE = 0;
        [B][COLOR=#ff0000]NOP();    NOP();[/COLOR][/B]
        prescaler_cntr++;    // count until TMR0 incremented
    }while(oldTMR0==TMR0 && prescaler_cntr<=255);    //test if timer0 has incremented
    //}while(oldTMR0==TMR0);    //test if timer0 has incremented
    return ((oldTMR0<<8) + (256-prescaler_cntr));
}

void calibrate(void)
{
    unsigned char i;
    lcd_clear();
    lcd_gotoxy(1,1);
    lcd_puts("Calibrating.");
    lcd_gotoxy(1,3);
    lcd_puts("please wait..");
    remove_ccal();
    F1 = (double)measure_freq();    //dummy reading to stabilize oscillator
    delay10ms(50);
    F1 = (double)measure_freq();
    add_ccal();
    F2 = (double)measure_freq();    //dummy reading to stabilize oscillator
    delay10ms(50);
    F2 = (double)measure_freq();
    remove_ccal();
    lcd_gotoxy(0,4);
    for(i=0; i<84; i++)
    {    //show progress bar
        lcd_send(0xfc, LCD_TDATA);
        delay10ms(2);
    }
}
void measure_capacitance()
{
    unsigned int var;
    double Cin;
    lcd_gotoxy(7,5);
    lcd_puts(" capacitance");
    var = measure_freq();
    F3 = (double)var;       
    if(F3>F1)    F3 = F1;    //max freq is F1;
    Cin = F2*F2*(F1*F1 - F3*F3)*Ccal/(F3*F3*(F1*F1-F2*F2));
    if(Cin>999)
    {
        if(Cin>(999E3))
        {
            if(Cin>(999E6))
            {
                Cin = Cin / (1E9);
                display_unit(4);    //"mF"
            }
            else
            {
                Cin = Cin / (1E6);
                display_unit(5);    //"uF"
            }
        }
        else
        {
            Cin = Cin/1E3;
            display_unit(6);    //"nF"
        }
    }
    else    display_unit(7);    //"pF"
    Cin = Cin*100;        //scale to 2 decimal place
    var = (unsigned int)Cin;
    display_reading(var);
}
void measure_inductance()
{
    unsigned int var;
    double Lin, numerator, denominator;
    lcd_gotoxy(7,5);
    lcd_puts(" inductance ");
    var = measure_freq();
    F3 = (double)var;       
    if(F3>F1)    F3 = F1;    //max freq is F1;
    numerator = ((F1*F1)-(F3*F3)) * ((F1*F1)-(F2-F2)) * (gate_period*gate_period);
    denominator = 4*pi*pi*F1*F1*F2*F2*F3*F3*Ccal;
    Lin = (numerator/denominator) * 1E15;    //scale to nH    { pF/1E12 * nH/1E9 * (s/1E3)^2 }
    if(Lin>999)
    {
        if(Lin>(999E3))
        {
            if(Lin>(999E6))
            {
                Lin = Lin / (1E9);
                display_unit(0);    //"H"
            }
            else
            {
                Lin = Lin / (1E6);
                display_unit(1);    //"mH"
            }
        }
        else
        {
            Lin = Lin/1E3;
            display_unit(2);    //"uH"
        }
    }
    else    display_unit(3);    //"nH"
    Lin = Lin*100;        //scale to 2 decimal place
    var = (unsigned int)Lin;
    display_reading(var);
}
void delay10ms(unsigned int period_10ms)
{
    do{ __delay_ms(10); }while(--period_10ms);
}[/I]

I want to know the function of following instructions
1. relay_tris();
2. RBPU = 0; // enable portB internal pullup
3. NOP();

I am using mikroC pro for pic. My question is how can i translate those highlighted lines from MPLAB to mikroc pro??
also what is internal pull up??and how i can apply internal pullup in mikroC??

 

You should post your code with code tags.

My guess is relay_tris(); and NOP() are macros that are defined in a header file someplace.

RBPU is an SFR. You complier should have that. are you certain the code was written for the same chip that you have? Not all chips have the same SFRs.


Your chip appears to have pullups.



I don't know mikro C but it might be something like OPTION_REGbits.RBPU


Trying to interface to a 3310 display is an enormous undertaking. My suggestion is that you first have a basic understanding of mikro C and now to use the SFRs.

 

NOP();
NOP();

can be replaced with

asm {
  nop;
  nop;
}

 

RBPU is an SFR. You complier should have that. are you certain the code was written for the same chip that you have? Not all chips have the same SFRs.
Your chip appears to have pullups.

I am using pic 18f2550 this time

 

I am using pic 18f2550 this time

Your OP says PIC16F876A.

The pullup bit for that chip is in the INTCON2 register.