Hi!
I thought the best thing would be to tell the compiler, that the memory size is
smaller than the actual number, so an out-of-code-memory-error is thrown, even
when there are some bytes left.
The EEPROM-replacement memory MUST be placed at the end, for the high-endurance
cells occupy those adresses.
Such a library would be told how many bytes I intend to use. The library then
would in some way reduce the code space size known to the compiler and use the
then-reserved cells as EEPROM. The only open question is if the compiler
accepts a change of the available code space after the first PRAGMA CODE
statement from the device file.
The best solution IMHO would be a PRAGMA CODE_REDUCE compiler extension which
subtracts a number of words from the code space previously defined. But that
would require a compiler modification.
Greets,Kiste
Von: Vasile Surducan <[email protected]>
An: [email protected]
Gesendet: 8:57 Dienstag, 12.Mai 2015
Betreff: Re: [jallib] JAL library for managing High Endurance Memory ?
Kiste,
Assuming the memory will be placed at the end of the flash (1F80-1FFF), the
only trick is to check that memory is not over written by the compiler.
Vasile
On Tue, May 12, 2015 at 8:41 AM, 'Oliver Seitz' via jallib
<[email protected]> wrote:
Thinking again...
IF a "pragma code" statement can change a previously defined code space size
without issuing a warning or error, it may be possible to write such a library
without compiler modification. It would however need a list of chips which
support the high endurance flash, and that list would also need information
which would generally belong in the device files.
Greets,Kiste
Von: 'Oliver Seitz' via jallib <[email protected]>
An: "[email protected]" <[email protected]>
Gesendet: 6:28 Dienstag, 12.Mai 2015
Betreff: Re: [jallib] JAL library for managing High Endurance Memory ?
Hi!
It's nextto impossible to write a stable library for that. The high endurance
memory is within the code memory space. It must be assured, that locations
which are used as EEPROM replacement are not occupied by program code. That
means, the more EEPROM space is needed, the smaller the machine code program
needs to be.
And that's the problem: A high level language program can't know what size the
compiled code will be. It needs to be checked manually after compilation. The
jallib libraries are somewhat like "If it compiles, it runs." A library making
use of the high endurance flash can't provide that level of safety.
Sorry for that.
Greets,Kiste
Von: Jacques Nilo <[email protected]>
An: [email protected]
Gesendet: 23:55 Montag, 11.Mai 2015
Betreff: [jallib] JAL library for managing High Endurance Memory ?
Hi all
I am currently working on the possibility to use the High Endurance memory on
the 16F1xxx as a replacement for non existing EEPROM on these chips (e.g.
16F1509 or 16F1709)
There is an application note describing this (Microchip AN1673).
I was wondering if any one has ever work on porting the C library described in
this note in JAL ?
Jacques
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