pic16f877a timer0 c programming

Friends/sirs,

I am trying to get the frequency of external clock pulse to displayed on LCD using pic16f877a in Hi-Tech PICC 9.82 c compiler. Following is the program:-

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#include<pic16f877a.h>

#define ldata PORTB
#define rs PORTCbits.RC0
#define en PORTCbits.RC1


void Display_Freq(unsigned int freq2write) ;
void Lcd_Cmd(unsigned char value);
void Lcd_display(unsigned char value);
void delay_lcd(unsigned int time);
void delay();

const char txt1[10]="Frequency=\n";
const char txt2[10] = "Hz\n";
const char txt3[20] = "Out of Range\n";
//const char txt4[30] = "Wind speed>53Kn\n "
int i;
unsigned char freq[6] ;


void main()
{
PORTAbits.RA4 = 1;
TRISB = 0x00;
TRISC = 0x00;

Lcd_Cmd(0x38); //LCD initialize
delay();
Lcd_Cmd(0x0c);
delay();
Lcd_Cmd(0x01);
delay();
Lcd_Cmd(0x06);
delay();
Lcd_Cmd(0x80);
delay();
for(i=0;i<10;i++)
Lcd_display(txt1);

OPTION_REG = 0x00;
OPTION_REGbits.PS0=0;
OPTION_REGbits.PS1=0;
OPTION_REGbits.PS2=0;
OPTION_REGbits.PSA=1;
OPTION_REGbits.T0SE=0;
OPTION_REGbits.T0CS=1;
delay();
while(1)
{
TMR0=0;
INTCON = 0B00100000;
delay();
if(INTCONbits.TMR0IF)
{
Lcd_Cmd(0x80);
delay();
for(i=0;i<20;i++)
Lcd_display(txt3);
delay();
}

Display_Freq(TMR0);

}
}


void Display_Freq(unsigned int freq2write)
{
freq[0] = (freq2write/1000)+48 ;
freq[1] = (freq2write/100)%10+48 ;
freq[2] = (freq2write/10)%10+48;
freq[3] = freq2write%10+48 ;
Lcd_Cmd(0x86);

for(i=0;i<5;i++)
Lcd_display(freq);
Lcd_Cmd(0x8A);
delay();
for(i=0;i<10;i++)
Lcd_display(txt2);
}


void Lcd_Cmd(unsigned char value)
{
ldata = value;
rs = 0;
en = 1;
delay_lcd(30);
en = 0;
}


void Lcd_display(unsigned char value)
{
ldata = value;
rs = 1;
en = 1;
delay_lcd(30);
en = 0;
}


void delay_lcd(unsigned int time)
{
unsigned int i,j;
for(i=0;i<time;i++)
for(j=0;j<135;j++);
}



void delay()
{
unsigned i;
for(i=0;i<10000;i++);
}

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The problem is I am not getting the right value inside TMR0 register, when I apply signal to RA4 pin. Means if i give the clock pulse of 151Hz, it shows something 22Hz. But when I directly assign some value to TMR0 in while() loop, it displays correctly that value. I dont understand, whether my program is correct or not. Because when i do this program in mickro C, it works absolutely fine. I just copied that in mplab & added the functions. That it, but still unable to get it. Please help me out.

Thank You.

Zip and post both mikroC project files and Hi-Tech C project files.

here is the attachment.

I thinks your delay function is not same.
This code is display number signals is received. You need calculate freq from that value.

forforum said:

I thinks your delay function is not same.
This code is display number signals is received. You need calculate freq from that value.

Click to expand...

Oh....I got it. Now, its working.. Thanks a lot.!!