Ultrasonic Sensor using PIC for my FYP...

[Steven5103]

i need help...
the ultrasonic sensor could not work using the software i'm having...
there are current going to PIC but the PIC has no output for the ultrasonic.
i think the problem should be on the software...
but i cant figure out which part of the software has mistakes...
i need help please...
thank you..



The software :
#include <stdio.h>
#include <htc.h>
#include "delay.h"
#include "lcd.h"

#define ULTRASONIC_SENSOR RC2
#define MOTOR1_SIGNAL     RB7
#define MOTOR1_DIRECTION  RB6
#define MOTOR2_SIGNAL     RB5
#define MOTOR2_DIRECTION  RB4

__CONFIG(0x3f71);

void main ( void )
{
   unsigned int sensorPulseRisingEdge, sensorPulseFallingEdge;
   unsigned int sensorPulseWidth;
   char LCDString [ 17 ];
   
   // Initializations
   TRISB = 0x00;
   TRISC = 0x00;

   lcd_init();

   lcd_goto ( 0x00 );
   lcd_puts ( "Pulse width:" );

   MOTOR1_DIRECTION = MOTOR2_DIRECTION = 0;

   T1CON = 0x01;

   while ( 1 )
   {
       // Body
TRISC2 = 0;
RC2 = 1;
DelayUs ( 5 );
RC2 = 0;
TRISC2 = 1;

       // Measure pulse width of ultrasonic sensor
       while ( RC2 == 0 ) // wait for RC2 to go high
           continue;

       sensorPulseRisingEdge = ( TMR1H << 8 ) + TMR1L;

       while ( RC2 == 1 ) // wait for RC2 to go low
           continue;

       sensorPulseFallingEdge = ( TMR1H << 8 ) + TMR1L;

       sensorPulseWidth = sensorPulseFallingEdge - sensorPulseRisingEdge;

       lcd_goto ( 0x40 );
       sprintf ( LCDString, "%d us    ", sensorPulseWidth );
       lcd_puts ( LCDString );

       DelayMs ( 250 );
       DelayMs ( 250 );
   }
}