Re: Strange pic programming problem

From: Ed (ed_at_NOSPAMmicra.org.uk)
Date: 07/06/04 

Date: Tue, 06 Jul 2004 02:53:51 GMT

Ed wrote:

> Im back again with yet another question!! :)
>
> I am programming a 16F877A and at the moment I am trying to read and
> write to the EEPROM memory. This is bascially what I have done:
>
> At the beginning of the program I have set this:
>
> MOVLW 0x19 ;
> MOVWF EEADRV ;
> MOVLW 0x19 ;
> MOVWF EEDATAV ;
> CALL WRITE ;
>
> WRITE (code has been omitted to save space here)
>
> MOVF EEADRV,W ;Data Memory Value
> MOVWF EEADR ;Address to write
> MOVF EEDATAV,W ;Data Memory Value
> MOVWF EEDATA ;to write
>
> So very bascially all I am trying to do is load EEADRV and EEDATAV with
> 0x19, then in the write subroutiene, move EEADRV to EEADR and EEDATAV to
> EEDATA, however for some reason this just wont work in my program,
> however if I take this same code and create a new asm file, it works
> fine and I can load EEADR and EEDATA with what ever I want without a
> problem.
> Since the first load commands are right at the beginning of my program
> and the write subroutiene is at the end could this cause any problem
> with passing the accross to the other variables. My code is about 1800
> lines, and this is all I can think of, however I dont know a solution -
> I'm hoping somone here might and can help me here.
>
> Thanks
>
> Ed
>
Ed wrote: 

-- 
*                         Micra Sports Club                         *
*        Don't underestimate, what you will never understand        *
*     http://www.micra.org.uk http://www.micrasportsclub.co.uk      *> 
Im back again with yet another question!! :)
> 
> I am programming a 16F877A and at the moment I am trying to read and 
> write to the EEPROM memory. This is bascially what I have done:
> 
> At the beginning of the program I have set this:
> 
> MOVLW        0x19            ;
> MOVWF        EEADRV            ;
> MOVLW        0x19            ;
> MOVWF        EEDATAV            ;
> CALL        WRITE            ;
> 
> WRITE (code has been omitted to save space here)
> 
> MOVF        EEADRV,W        ;Data Memory Value
> MOVWF        EEADR            ;Address to write
> MOVF        EEDATAV,W        ;Data Memory Value
> MOVWF        EEDATA            ;to write
> 
> So very bascially all I am trying to do is load EEADRV and EEDATAV with 
> 0x19, then in the write subroutiene, move EEADRV to EEADR and EEDATAV to 
> EEDATA, however for some reason this just wont work in my program, 
> however if I take this same code and create a new asm file, it works 
> fine and I can load EEADR and EEDATA with what ever I want without a 
> problem.
> Since the first load commands are right at the beginning of my program 
> and the write subroutiene is at the end could this cause any problem 
> with passing the accross to the other variables. My code is about 1800 
> lines, and this is all I can think of, however I dont know a solution - 
> I'm hoping somone here might and can help me here.
> 
> Thanks
> 
> Ed
> 
Ok I just tried moving the EE routienes to the front of my program with 
no sucess - now im totally stuck :( Any suggestions welcome.
Ed
-- 
*                         Micra Sports Club                         *
*        Don't underestimate, what you will never understand        *
*     http://www.micra.org.uk http://www.micrasportsclub.co.uk      *
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