> I've got a program, that should when it's finished receive a character
in
> the range A-G from the UART, and depending on the character received
perform
> an AD Conversion of one of the pins, and transfer the result back to a
PC

I've got a template UART command processor project at
http://www.embedinc.com/pic/hos.htm.  It uses a jump table to dispatch to
different code for each command byte received from the UART.  The dispatch
code is in the HOS_CMD.ASPIC module.  The UART read and write routines are
in the HOS_UART.ASPIC module.

> loop
>      call               ser_in                  ; Call ser_in,
>      call               doconverstion           ; when finished in
ser_in
> goto transmit w
>      goto       loop                    ; when finished transmitted,
start
> ago.
>
> ser_in

This is apparently a subroutine entry point.  It should have a clear
comment saying so!

>         btfsc   rcsta,oerr              ; does rcsta indicate an
overflow

I don't see anything to guarantee the correct bank setting here.  In fact,
you seem to have completely ignored both banking and paging.  You can
ignore paging if the PIC has 2K code space or less, but all PICs with a
USART have at least two banks that I know of.

> error
>         goto    overerror               ; if so goto overerr
>         btfsc   rcsta,ferr              ; does rcsta indicate an
frameing
> error
>         goto    frameerror              ; if so goto frameing error.
>
> uart_ready
>
>         btfss   pir1,rcif               ; Check If Data Received.
>         goto    ser_in          ; If Not goback and recheck.
>
> uart_gotit
>         bcf     intcon,gie              ; Clear This Pin
>         btfsc intcon,gie                ; Check If Cleared.
>         goto    uart_gotit              ; If Not Clear reset.

Why are you disabling interrupts around reading RCREG?  I don't see any
reason to do so.

Again, address the banking and try again.  Persuing anything else until
banking is fixed would be pointless.


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