Help with Capture mode in PIC CCP

[hemnath]

Sorry for posting this post again. I did get any solution from my recent post. So i think re-posting the post again will get some results. Please help in configuring the registers with PIC CCP module in Capture mode.

#include "18f2520.h"
#include "f2420_regs.h"
#fuses INTRC
#use delay(clock=4000000)

#define RS PIN_A2
#define EN PIN_A1

void lcd_init();
void lcd_cmd(unsigned char);
void lcd_data(unsigned char);

unsigned int16 value;
unsigned int8 high_byte, low_byte;

void main()
{
lcd_init();
TRIS_C2	=	1;				//	PIN C2 configured as input for capture mode
TRISB	=	0;

CCP1CON	=	0b00000101;		//	Capture mode, every rising edge
CCPR1H	=	0;
CCPR1L	=	0;

T1CON	=	0b11001000;		//	16-Bit, 1:1 Prescale value

while(1)
{
TMR1H	=	0;
TMR1L	=	0;
CCP1IF	=	0;				//	Interrupt flag is cleared
while(CCP1IF == 0); 		//	waits till Interrupt flag gets cleared

TMR1ON	=	1;				//	Timer1 ON

CCP1IF	=	0;				//	Interrupt flag is cleared
while(CCP1IF == 0); 		//	waits till Interrupt flag gets cleared

TMR1ON	=	0;				//	Timer1 OFF

low_byte = CCPR1L;
high_byte = CCPR1H;

value   =   ((high_byte * 256) + low_byte);

CCP1IE	=	0;
CCP1IF	=	0;
lcd_cmd(0x01);
lcd_cmd(0x80);
printf(lcd_data,"%lu secs",value);
delay_ms(1000);
}
}

void lcd_init()
{
lcd_cmd(0x30);      // Configure the LCD in 8-bit mode, 1 line and 5x7 font
//lcd_cmd(0x28);
lcd_cmd(0x0c);      // display on and cursor off
lcd_cmd(0x01);      // clear display screen
lcd_cmd(0x06);      // increment cursor
lcd_cmd(0x80);      // set cursor to 1st line
}

void lcd_cmd(unsigned char c)
{
output_b(c);
output_low(RS);
output_high(EN);
delay_ms(15);
output_low(EN);
}

void lcd_data(unsigned char z)
{
output_b(z);
output_high(RS);
output_high(EN);
delay_ms(15);
output_low(EN);
}

 

[jayanth.devarayanadurga]

What is your input freq time period and what value are you getting?

 

[hemnath]

Everytime values are changing.
I'm giving 2Khz to PIN C2. It shows some values on LCD. Say about 7525 secs. When i change the frequency from 2Khz to 5Khz, there is no change in the LCD.
Please check that i have configured the registers correctly. I have doubt in that.

Thanks in advance