Accelerometer code

[ImmortalAres]

I've been working on writing code for an accelerometer that outputs a PWM signal. I've been trying to adapt some of Kevin's code that dealt with an infrared sensor that output PWM signals.

the following is Kevin's with a few variable name changes

switch(RB5_State) // current state determines how the function behaves
{
case 0: // falling-edge detected (beginning of the pulse)
Int_4_Down_Edge_Count_High = Clock; // get a snapshot of the time
tbuf = TMR1L; // TMR1L must be read before TMR1H
Int_4_Down_Edge_Count_Low = TMR1H;
Int_4_Down_Edge_Count_Low <<= 8;
Int_4_Down_Edge_Count_Low += tbuf;
break; // now wait for the rising-edge interrupt to happen...

case 1: // rising-edge detected (end of the pulse)
Int_4_Up_Edge_Count_High = Clock; // get a snapshot of the time
tbuf = TMR1L;
Int_4_Up_Edge_Count_Low = TMR1H;
Int_4_Up_Edge_Count_Low <<= 8;
Int_4_Up_Edge_Count_Low += tbuf;

// determine the pulse-width period by determining the time
// difference between the falling-edge and rising-edge interrupts
if (Int_4_Up_Edge_Count_High == Int_4_Down_Edge_Count_High)
{
// this is quicker because the 16-bit system clock hasn't changed and therefore has no effect on the outcome
Int_4_Period = Int_4_Up_Edge_Count_Low - Int_4_Down_Edge_Count_Low;
}
else
{
//this works because the pulse-width will always be less than one clock tick(= 65536 timer ticks)
//(=0.0000001 seconds) 1 * 10^-7 sec (0.1 micro seconds)
Int_4_Period = 65536 - Int_4_Down_Edge_Count_Low + Int_4_Up_Edge_Count_Low;
}
break; // now wait for another falling-edge interrupt to happen...

now i have my accelerometer plugged into digital input 3 and 4 (x and y PWMs) as far as i can tell the RB5 pin never switches state because when i printf("data:%d",Int_4_Down_Edge_Count_High); or Int_4_Up_Edge_Count_High the value is always 0 so the clock value never gets assigned meaning it never entered the switch statement.

It does the same thing for the interrupt on digital input 3

Any words of advice or help would be greatly appreciated. Thanks.