Migrating to MPASM

[Luckyborg]

I switched over to MPASM several months ago when I started using an 18F4520. I'm going back to some of my other code that needs an update and am having trouble with a 16F631. I have commented out the config lines in the inc file. I get "Error[113] c:\pbp\pbppic14.lib 5985 : Symbol not previously defined (EEPGD)"

After stripping down the code I have isolated the error to anytime I use a read or write statement. If I switch back to PM all is well.

define osc 8
Clear

'@     device pic16F631, INTOSCIO, wdt_on, pwrt_on, MCLR_OFF, protect_on, IESO_OFF
@ __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _IESO_ON
 
OSCCON = %01110101              'set internal osc on to 8 mhz
		

Prev_Baud   var byte


ANSEL = 0               'set port to digital
OPTION_REG.7 = 0        'enable pull ups on A and B


read 0, Prev_Baud
if Prev_Baud > 4 then   'don't allow anything over 19200, default to 9600
    write 0, 3
endif

Pause 1000

main:

goto main

End

Any ideas? I would rather not have to always switch back and forth depending on which chip I'm using. I uninstalled and removed MPASM and installed the newest version already.

David

[Archangel]

I switched over to MPASM several months ago when I started using an 18F4520. I'm going back to some of my other code that needs an update and am having trouble with a 16F631. I have commented out the config lines in the inc file. I get "Error[113] c:\pbp\pbppic14.lib 5985 : Symbol not previously defined (EEPGD)"

After stripping down the code I have isolated the error to anytime I use a read or write statement. If I switch back to PM all is well.

define osc 8
Clear

'@     device pic16F631, INTOSCIO, wdt_on, pwrt_on, MCLR_OFF, protect_on, IESO_OFF
@ __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_OFF & _IESO_ON
 
OSCCON = %01110101              'set internal osc on to 8 mhz
		

Prev_Baud   var byte


ANSEL = 0               'set port to digital
OPTION_REG.7 = 0        'enable pull ups on A and B


read 0, Prev_Baud
if Prev_Baud > 4 then   'don't allow anything over 19200, default to 9600
    write 0, 3
endif

Pause 1000

main:

goto main

End

Any ideas? I would rather not have to always switch back and forth depending on which chip I'm using. I uninstalled and removed MPASM and installed the newest version already.

David

Hi David,
I cannot duplicate the error, I copied and pasted your code into an existing program, ditto for your config and it compiles fine for a 16F631 for me PBP ver 2.6. I thought the omission of eecon1 settings might be your problem, but alas it compiles without error without it. What version of PBP are you using? Maybe the latest ver. has added something because I see no mention of EEPGD in my lib until line 6069 and there is mention of EECON1 in there, try setting the EECON1 register and see it that works. The 16F631 series resets with eeprom write disabled to prevent accidental writes on power up.

[Luckyborg]

I'm using compiler version 2.47, maybe that is the problem. I see melabs updated some RAM issues with this chip. I don't know enough to know if the compiler will pass the code off to the PM assembler correctly but not to MPASM. My code has seemed to work correctly for quite a while, but perhaps I'm not pushing the right buttons to make it break.

Thanks for checking for me Joe.

Anyone else out there with 2.47 who can try to compile the above for me to see if they get the same results or not?

David

[Bruce]

The RAM issue is an easy fix. Open your 16F631.BAS file and change BANK0 $0020, $007F
to BANK0 $0040, $007F. RAM on this one starts at $40 not $20. Save & exit.

The EEPGD thing is due to the 16F631 not having this bit available, since it can't read/write
to its own program memory. But the library functions for READ and WRITE use it.

You can fix the READ/WRITE library routines:

Open your pbppic14.lib, and scroll down to the READ library routine.

Comment the bcf EECON1,EEPGD and add the clrf EECON1 just below it.

 ;bcf  EECON1, EEPGD	; Read from data memory
  clrf  EECON1		; Read from data memory

Scroll down a ways to the WRITE library routine, and do the same thing.

I don't have a 16F631 to test, so let me know if this fixes it for you.

[mackrackit]

I am still using PBP2.5 and I get the ram errors also.

The 16f631.bas currently has
BANK0 $0040, $007F

RAM END MUST BE DEFINED is the error.

EDIT>>>
I get the same errors with PM also... So it must not be a MPASM thing

[Luckyborg]

I had the RAM issue already fixed. I had forgotten Charles LEO helped with that back in 07 when I first started with this chip. I have since made the 2 changes to the read and write routines that Bruce gave and the errors went away. Now all that is left to do is to test it out. Thanks to everyone for your help

David

[mackrackit]

I had the RAM issue already fixed. I had forgotten Charles LEO helped with that back in 07 when I first started with this chip. I have since made the 2 changes to the read and write routines that Bruce gave and the errors went away. Now all that is left to do is to test it out. Thanks to everyone for your help

David

How were the ram errors fixed?