IAR C-compiler for AVR: Array of pointers to strings in flash

erik.cato@japro.se (Erik Cato) writes:

> Mats Kindahl <mats.kindahl@nowhere.net> wrote in message 
> 
> > >> What are you going to do with all the strings? If you are going to
> > >> write them out, you will have to recompile (parts of) the library
> > >> to get a printf() version accepting pointers into flash memory.
>   
> > > We are writing special functions for displaying text so there is no
> > > need for printf.
>  
> > Then you will have no problems (in this regard, at least). 
>  
> > You do know that you can reuse the printf() implementation if you need
> > more advanced printing? It can also be configured to exclude some
> > support that is not needed (for example, printing floating-point
> > numbers).
> > 
> > Best wishes,
> > Mats Kindahl
> 
> No, I didn&#4294967295;t know this. How? Can you point me to where i can find more info
> in this issue. 

You have all the source for the libraries under 'src' in the
installation root for the AVR Workbench (which is in the directory
'D:/Program Files/IAR Systems/Ew23/avr' on my computer).

Basically what you have to do is to recompile the write formatter
(IIRC, in file frmwri.c, but you have to look that up) and maybe some
other files containing printf; If you just make a copy of them and add
them to your project the linker will select your functions instead of
those in the precompiled libraries.

There are some descriptions about this in the C Compiler Manual (look
for _formatted_write... at pages 32-38 in my version), but to get
support specifically on your problem I suggest you contact our support
department: they are really good at solving these kinds of problems
and have more experience with all the details.

You find them on:

        http://www.iar.com/Support/EW/

You will also find application notes and technical articles at the
same place.

Best wishes,
Mats Kindahl
-- 
IAR Systems in Uppsala, Sweden.

Any opinions expressed are my own and not those of my company.

Spam prevention: contact me at mNaOtSkPiAnM@acm.org or
mNaOtSs.kPindAahMl@iar.se, removing the *NO SPAM* from the address.