problem with adc using PIC16F876A

[Rikus]

Hi. I know this is the second post I've posted on this topic, but I'm not quite sure where this post belong. Maybe I have more luck here.

I'm having a huge problem. I'm using the code below on an ICD2 to read a value from the analog input via the adc and converting it to pwm. The code works fine on the IDC2 but for some reason it will not work on my self-built board. Not working means CCP1 stays low. I'm assuming the software is fine and this is a hardware problem. I'm using a 50k pot connected to 5V and Gnd only to input on A0. The voltage at A0 varies between 0V and 5V as the pot is adjusted, but why is there no output on CCP1? Please help. I'm going crazy!!

#include "16F876A.h"
#use delay(clock = 4000000)

unsigned int16 duty = 0;
unsigned int16 analoogWaarde;

main()
{
// Pin setup
set_tris_A(1) ;
// Port A as input
set_tris_C(0x0) ;

// ADC Setup
setup_adc_ports(RA0_ANALOG); // Set RA0 as analog
setup_adc(ADC_CLOCK_INTERNAL );
set_adc_channel(0);

// PWM Setup
setup_ccp1(CCP_PWM); // Configure CCP1 as PWM
setup_timer_2(T2_DIV_BY_16, 77, 1); // Timer 2 for 800Hz
set_pwm1_duty(duty); // Duty Cycle


while(1)
{
analogValue = read_adc() ; duty = analogValue ; set_pwm1_duty(duty); }


}

[rwyoung]

#fuses statement?

Are you certain you removed all the debug enabling bits from the fuse statement and from the #use statements?

What is your clock source, is your clock running?
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month!

[Guest]

I've disabled and enabled all nessesary fuses in the configuration bits setting in MPLAB. The settings are as followed:
Oscilator = RC
Watchdog Timer = ON (should this be off?)
Brown Out Detect = ON (shoulf this be off?)
Power up timer = OFF
Low Voltage Program = Enabled
Flash Program Write - Write Protection Off
Data EE Read Protect = OFF
Code Protect = OFF

I'm using a 4MHz crystal. I'm assuming it works because I programmed a port to complement after a few seconds and by connecting a LED to the port it blinked.

[Rikus]

Thanx for your help. I found the problem. The firts time (testing the blinking LED) the configuration bits settings were correct, but the secund (third, forth, etc) time the settings were changed for some reason. After changing it to the original settings, the adc worked fine.

[PCM programmer]