> Help!  I need help with the firmware to make an LED dimmer with a
> 12C509 PIC running off the internal oscillator.  I have been able to read a
> pot and dim the LED with PWM, but my source code does not run fast
> enough to keep the LEDs from flickering(They are multiplexed 7 segment
> displays run off another PIC).  I would like to do the PWM at about 1KHz.
> That doesn't leave a lot of time to read the pot, etc.  The code also
> needs to check an input pin and output a pulse on another pin if a switch
> is closed for more than 2 seconds.
> The resolution doesn't have to be real high and the duty cycle doesn't
> have to be a full 0 to 100%, but the closer I can get the better.  I
> appreciate, any help anyone can give me.  I am not good with real time
> programming.

I guess you have a loop performing key reading, pot reading, LED flicker
and output control.

Do you pause for the A/D conversion to finish? It's not nessesary. You can
start the A/D conversion, and let the converter work while you do the
looping. Let the loop poll the ADFinished flag. If the flag says that A/D
conversion is finished, read the value and start a new conversion. If the
conversion isn't finished, use the value formerly read.