Re: [avr-gcc-list] String array in ROM gives error in spite of following example code.

[Royce Pereira]

Thank you, all, for the guidance.


On Fri, Jun 13, 2014 at 12:44 PM, Senthil Kumar Selvaraj
<address@hidden> wrote:
> On Fri, Jun 13, 2014 at 12:02:58PM +0530, Royce Pereira wrote:
>> Thanks, Joerg,
>>
>> This is news to me :) !
>>
>> I googled for '__flash qualifier in AVR-GCC' and I understand that
>> using __flash eliminates the need for 'pgm_read_byte(&flashLocation)'
>> ?
>
> It reads as many bytes as necessary.
>>
>> That is, you read it directly (like other ram variables), and avr gcc
>> will read it from flash automatically ?
>>
>
> Yes. And there's the __memx qualifier which lets you access both flash
> and RAM seamlessly.
>
> If you use the __flash<n> qualifiers to place data in flash, there's some
> linker script setup involved.
>
> Regards
> Senthil
>>
>> On Fri, Jun 13, 2014 at 11:19 AM, Joerg Wunsch <address@hidden> wrote:
>> > Royce Pereira <address@hidden> wrote:
>> >
>> >> Even the libc documentation, which was once the bible of avr-gcc on
>> >> this is not accurate. The sample code just does not work.
>> >
>> > Apparently, nobody noticed before.  Please, file a bug report
>> > to the avr-libc project, so we can fix that.
>> >
>> > The question here (as always) is whether you really want both, the
>> > strings itself as well as the pointers (table of it) in flash.  The
>> > table is quite small, and could as well be kept in RAM unless you are
>> > very thight on RAM.
>> >
>> > As the compiler now understands the __flash qualifier, using that
>> > would make it a lot easier.
>> > --
>> > cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL
>> >
>> > http://www.sax.de/~joerg/
>> > Never trust an operating system you don't have sources for. ;-)
>> >
>> > _______________________________________________
>> > AVR-GCC-list mailing list
>> > address@hidden
>> > https://lists.nongnu.org/mailman/listinfo/avr-gcc-list
>>
>>
>>
>> --
>> Best Regards,
>>
>> -- Royce Pereira
>>
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-- 
Best Regards,

-- Royce Pereira