Re: [Flashforth-devel] P18F Accessing FLASH above 0xebff

[Mikael N. <mik...@pp...>]

On 28.10.2011 19:03, Pete Zawasky wrote:
> HI Mikael,
>
> As you know I currently use the PIC18F6527 quite often.  As for using
> the PIC18F6722, any thoughts/recommendations for accessing the FLASH
> memory above 0xebff?   Perhaps not so much for program space as the
> storage of somewhat permanent data for LCD screens, etc.
>
It could work by setting TBLPTRU to 1 and then moving data with memory 
operators.
The catch is, you cannot use the interpreter in between
so you have to first compile a word that does the actual moving of data.
For example like this:

: flash_to_ram ( flashaddr ramaddr count 64Kbyte_flash_page --- )
   iflush
   tblptru c!
   cmove
   0 tblptru c!
;

: ram_to flash ( ramaddr flashaddr count 64Kbyte_flash_page --- )
   iflush
   tblptru c!
   cmove
   0 tblptru c!
;

To be able to set the tblptru interactively, then
LIT: DOCREATE: DODOES: DOUSER:
would need to push tblptru, clear tblptru, do their stuff and pop tblptru.

If using forth interrupt words, then i] and [i needs to push and pop 
also tblptru.

Heres your chance to hack FlashForth :-)

Best Regards
Mike