Presetting Configuration Fuses (PIC Defines) into your Program

[mister_e]

O.K. This is ask really often. Worth to be discussed NOW!

What to do if i get "overwriting previous address content" error message?

This error is return by PBP because your configuration fuse overwrite 'PBP default'. If you open with notepad, in PBP directory, the .INC file of your PIC, let's say 16F628, the file will look like this

;**************************************************************
;*  16F628.INC                                                  *
;*                                                              *
;*  By        : Leonard Zerman, Jeff Schmoyer                   *
;*  Notice    : Copyright (c) 2002 microEngineering Labs, Inc.  *
;*              All Rights Reserved                             *
;*  Date      : 09/27/02                                        *
;*  Version   : 2.43                                            *
;*  Notes     :                                                 *
;**************************************************************
        NOLIST
    ifdef PM_USED
        LIST
        include 'M16F62x.INC'   ; PM header
        device  pic16F628, xt_osc, wdt_on, pwrt_on, mclr_on, lvp_off, protect_off
        XALL
        NOLIST
    else
        LIST
        LIST p = 16F628, r = dec, w = -302
        INCLUDE "P16F628.INC"   ; MPASM  Header
        __config _XT_OSC & _WDT_ON & _PWRTE_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF
        NOLIST
    endif
        LIST

So if you try to define HS oscillator, wich is already define, you'll overwrite the previous content of the PBP setting.

To fix it, just comment those lines :

;device  pic16F628, xt_osc, wdt_on, pwrt_on, mclr_on, lvp_off, protect_off

OR

;__config _XT_OSC & _WDT_ON & _PWRTE_ON & _MCLRE_ON & _LVP_OFF & _CP_OFF

depending what you are using to compile your code, MPASM or PM.

OR some will prefer to edit those line directly... as you wish...

Where can i find the configuration fuse for my PIC ?

All the configuration fuse are in the according .INC file located in the MPLAB directory. In MPLAB 7.01, the default directory, i suppose, is C:\Program Files\Microchip\MPASM Suite.

If you open the appropriate .INC file, you will find all the configuration fuse for your PIC at the end of the file.

looks like this for a 16F628...only the end

;==========================================================================
;
;       Configuration Bits
;
;==========================================================================

_BODEN_ON                    EQU     H'3FFF'
_BODEN_OFF                   EQU     H'3FBF'
_CP_ALL                      EQU     H'03FF'
_CP_75                       EQU     H'17FF'
_CP_50                       EQU     H'2BFF'
_CP_OFF                      EQU     H'3FFF'
_DATA_CP_ON                  EQU     H'3EFF'
_DATA_CP_OFF                 EQU     H'3FFF'
_PWRTE_OFF                   EQU     H'3FFF'
_PWRTE_ON                    EQU     H'3FF7'
_WDT_ON                      EQU     H'3FFF'
_WDT_OFF                     EQU     H'3FFB'
_LVP_ON                      EQU     H'3FFF'
_LVP_OFF                     EQU     H'3F7F'
_MCLRE_ON                    EQU     H'3FFF'
_MCLRE_OFF                   EQU     H'3FDF'
_ER_OSC_CLKOUT               EQU     H'3FFF'
_ER_OSC_NOCLKOUT             EQU     H'3FFE'
_INTRC_OSC_CLKOUT            EQU     H'3FFD'
_INTRC_OSC_NOCLKOUT          EQU     H'3FFC'
_EXTCLK_OSC                  EQU     H'3FEF'
_LP_OSC                      EQU     H'3FEC'
_XT_OSC                      EQU     H'3FED'
_HS_OSC                      EQU     H'3FEE'

        LIST

[Acetronics2]

Hi,Steve

Thank you for the answer, I finally found what I was looking for : in the M16F84.inc,and others .inc all the values do not appear !!!
So, I simply had to add them ...

My question was more about how to have the Hex file written on the HDD ...
as it appears in the program window and can be downloaded to the Pic.

IF this stupid uncancellable error message was only a Warning things would be so simpler !!! ( errorlevel - ... etc )

So, I ask it again : is there something reasonnably possible to memorize the content of the program window ??? ( yeah, write it on a paper .... Thanks !!! )

Mhhh ... fore core calculation, have a look here :
http://www.epcos.com/web/generator/W...locale=en.html

read you soon
Have a nice Sunday

Alain

[RUBiksCUbe]

Oh yeah! Got it working!! I needed to put in the PIC defines in the beginning. It was giving me those errors because I didn't need the line:

@ INCLUDE "P18F252.INC" ; MPASM Header

I'm not sure why I dont need it, but I think its because 18F252.INC has an identical line in it, so I was including it twice. Thanks soooo much!!!

[eoasap]

Hi, i'm using the 18F452 chip so required to use MPASM compiler through Picbasic.
if i try to set a fuse using ONLY (for example) the line below

@ __config _LVP_OFF

i get this error:
x.asm 112: symbol not previously defined (_LVP_OFF)
x.asm 112: argument out of range (not a valid config register address)



if i put the following code:
@ INCLUDE "P18F452.INC" ; MPASM Header
@ __config _LVP_OFF

i get errors like the following:
'1042: duplicate label ("DDRA" or redefining symbol that cannot be redefined)
1607: superseding current maximum RAM and RAM map
120: symbol not previously defined (_LVP_OFF)
etc..

i've been trying for a while now with no luck setting the fuses. any ideas what i'm doing wrong?

thanks!

[mister_e]

The 18F serie work different from the other. In the MPASM directory open the according .INC file. Look at the end you'll discover how to use the Config directive.

Free example here...

@ __CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
    ' Oscillator switch OFF
    ' Use HS oscillator (20MHZ here)
    '
@ __CONFIG _CONFIG2L, _BOR_ON_2L & _PWRT_ON_2L & _BORV_45_2L
    ' Brown out reset ON @ 4.5Volts
    ' Power-up timer ON
    '
@ __CONFIG _CONFIG2H, _WDT_ON_2H 
    ' Watch dog timer ON
    '
@ __CONFIG _CONFIG4L, _STVR_ON_4L & _LVP_OFF_4L & _DEBUG_OFF_4L
    ' Stack over/underflow ON
    ' Low Voltage programming OFF
    ' Background debugger OFF

[eoasap]

Steve,

Once again you are my savior
Thanks alot for always helping me and guiding me in the right direction. your advice worked perfectly and i got the overwrite error which i see from your other post how to handle that.

Thanks so much

[mister_e]

If you are using any PIC18 serie, you will have this warning one day or another. Our friends from Microchip decide to change the way to define the config fuses when using the latest MPASM version 5.00.

The solution is still located at the same place... at the end of the 18XXXX.INC file located in the MPASM folder.

; IMPORTANT: For the PIC18 devices, the __CONFIG directive has been
; superseded by the CONFIG directive. The following settings
; are available for this device.
;
; Oscillator Selection:
; OSC = LP LP
; OSC = XT XT
; OSC = HS HS
; OSC = RC RC
; OSC = EC EC-OSC2 as Clock Out
; OSC = ECIO EC-OSC2 as RA6
; OSC = HSPLL HS-PLL Enabled
; OSC = RCIO RC-OSC2 as RA6

SO now the new method to set the config fuse on the PIC18 serie is...

@ CONFIG OSCS=OFF, OSC=HS
    ' Oscillator switch OFF
    ' Use HS oscillator (20MHZ here)
    '
@ CONFIG BOR=ON, PWRT=ON, BORV=45
    ' Brown out reset ON @ 4.5Volts
    ' Power-up timer ON
    '
@ CONFIG WDT=ON
    ' Watch dog timer ON
    '
@ CONFIG STVR=ON, LVP=OFF, DEBUG=OFF
    ' Stack over/underflow ON
    ' Low Voltage programming OFF
    ' Background debugger OFF

Or if you prefer...

ASM
    CONFIG OSCS=OFF  ; Oscillator switch OFF
    CONFIG OSC=HS    ; Use HS oscillator (20MHZ here)
    CONFIG BOR=ON    ; Brown out reset ON 
    CONFIG BORV=45   ; Brown out detect voltage=4.5 Volt
    CONFIG PWRT=ON   ; Power-up timer ON      
    CONFIG WDT=ON    ; Watch dog timer ON
    CONFIG STVR=ON   ; Stack over/underflow ON
    CONFIG LVP=OFF   ; Low Voltage programming OFF
    CONFIG DEBUG=OFF ; Background debugger OFF
    ENDASM

Don't forget to comment the default PBP config fuses...