16f887 to 18f4685 transition

[emerson]

No, I don't have anything nor have ever used anything like that before to my knowledge. I looked into the devices folder within my MPASM installation and I didn't see it in the list. Could that be why it isn't working?

[mackrackit]

You have never set the configuration for any chip? Not even changed the type of oscillator used? The *.inc file that needs changed is in the PBP directory.
Read through the thread I linked you too, figure out where all f the files are, then we can go from there.

[emerson]

Alright. I was able to find the .INC file and found the config bits at the bottom of the page. I came up with this so far but it doesn't work yet. Whenever I compile my program in MCS it gives me an error message for the "&" symbols.

@__CONIG_OSC_IRCIO67_1H &_FCMEN_OFF_1H &_PWRT_OFF_2L &_BOREN_OFF_2L &_WDT_OFF_2H &_MCLRE_ON_3H &_LVP_OFF_4L

And no I've never used this method before. I guess I've always gotten away with what I showed you in the initial post (until now), although now it seems incorrect.

[mackrackit]

Goto the *.inc file in the PBP directory and comment out the config lines so it looks like this:

;****************************************************************
;*  18F4685.INC                                                 *
;*                                                              *
;*  By        : Leonard Zerman, Jeff Schmoyer                   *
;*  Notice    : Copyright (c) 2008 microEngineering Labs, Inc.  *
;*              All Rights Reserved                             *
;*  Date      : 09/15/08                                        *
;*  Version   : 2.60                                            *
;*  Notes     :                                                 *
;****************************************************************
        NOLIST
    ifdef PM_USED
        LIST
        "Error: PM does not support this device.  Use MPASM."
        NOLIST
    else
        LIST
        LIST p = 18F4685, r = dec, w = -311, w = -230, f = inhx32
        INCLUDE "P18F4685.INC"	; MPASM  Header
     ;   __CONFIG    _CONFIG1H, _OSC_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
     ;   __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
     ;   __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
     ;   __CONFIG    _CONFIG4L,  _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_1024_4L & _XINST_OFF_4L
        NOLIST
    endif
        LIST
EEPROM_START	EQU	0F00000h
BLOCK_SIZE	EQU	64

Then in your code;

'18F4685 TEST

    @ __CONFIG    _CONFIG1H, OSC_IRCIO67_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
    @ __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
    @ __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
    @ __CONFIG    _CONFIG4L,  _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_1024_4L & _XINST_OFF_4L

[emerson]

I'm sorry but that didn't seem to work either, but I have a few questions now. The WDT, was that set to 512 to somehow complement the 8MHz oscillation speed? Also this config line:

_BBSIZ_1024_4L

Does this let the chip change variable values while it's running or does it allow the chip to add code (a FOR...NEXT loop for example) to itself while in operation?


By the way, thanks for the time and help thus far

[mackrackit]

BBSIZ is the Boot Block Size.

Goto
C:\Program Files\Microchip\MPASM Suite
and find the file "P18F4685.INC"
That is where you will find all of the config options, near the end of the file. Do not modify this file.

So, you are saying that the code does not compile from post #9?

[emerson]

The code does compile 100% no errors, but it runs improperly. I am getting scrambled characters from the HSERIN/HSEROUT commands when the program is on the 18f4685, but when the program is on the 16f887 it works perfectly.

Here is how I have the 16f887 initialized (I did not use any config settings here)

Define device 16F887
Define OSC 8
ANSEL=0 ' A/D disabled for ANS0 to ANS7
ANSELH=0 ' A/D disabled for ANS8 to ANS13
CM1CON0 = 0 ' Disable comparators
CM2CON0 = 0 ' These default to disabled at POR, but just in case
CM2CON1 = 0
ADCON1 = 7
IOCB = 0
INTCON = 0

DEFINE HSER_RCSTA 90h ' Enable Serial PORT
DEFINE HSER_TXSTA 24h ' Enable transmit
DEFINE HSER_SPBRG 129 ' set USART to 9600 baud (when BRGH=1)
DEFINE HSER_CLROERR 1 ' Enable automatic overrun error
DEFINE LOADER_USED 1

and this is how the 18f4685 is initialized

define device 18f4685
@ __CONFIG    _CONFIG1H, _OSC_IRCIO67_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
@ __CONFIG    _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
@ __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _MCLRE_ON_3H
@ __CONFIG    _CONFIG4L,  _STVREN_ON_4L & _LVP_OFF_4L & _BBSIZ_1024_4L & _XINST_OFF_4L
OSCTUNE = %11000000
OSCCON = %01110000
define OSC 8
CMCON = 0
ADCON0 = 7
ADCON1 = 7
ADRESH = %00000000
ADRESL = %00000000
INTCON = 0
INTCON2 = 0
INTCON3 = 0
IPR1 = 0
PIR1 = 0
PIE1 = 0


DEFINE HSER_RCSTA 90h ' Enable Serial PORT
DEFINE HSER_TXSTA 24h ' Enable transmit
DEFINE HSER_SPBRG 129 ' set USART to 9600 baud (when BRGH=1)
DEFINE HSER_CLROERR 1 ' Enable automatic overrun error
DEFINE LOADER_USED 1

The rest of the program has remained unchanged.