Migrating to MPASM

[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?

[Luckyborg]

I had modified the file manually at Charles instructions. I originally emailed MELabs and they told me what to fix for the RAM bank problem. Bruce's instructions got rid of the 2 errors I originally posted. I never got the same error that you posted. I never had any problems with PM.

[mackrackit]

That is interesting.
I do not have that chip so I guess I will not worry about it on this version.

Thanks.

[Bruce]

Dave,

I tried this with 2.50c and didn't get the error you show. Have you downloaded/installed
the 2.50c patch?