Re: [avr-gcc-list] PROGMEM with boot loader

[Yannick PODGORSKI]

Hi Wolfgang,
thanks again but it doesn't work again.
I use :
       const char essai[] PROGMEM = {"essai"};
and
       fprintf_P(OutPc, "%s", pgm_read_byte_far(essai));

You talked about PRG_RDB but I don't use it.
I try to use PSRT :
       fprintf_P(OutPc, PSTR("PSTR")); and it doesn't work.
You say that's fprint_P() supports only near progmem but
I don't see that in libc.
Sorry for my questions.

Yannick.

> On Fri, 19 Nov 2004, Wolfgang Quack wrote:

> Hi Yannick,
>
> uups, sorry.
>
> The fprintf_P() in avr-libc-1.0.4 supports only near progmem.
>
> Look at avr-libc-1.0.4/libc/stdio/vfprintf.c line 141:
> The old style macro PRG_RDB() is used there.
> This is defined as the near version of pgm_read_byte() instead of the
> far version you need to access the upper memory.
>
> Wolfgang
>
>
> On Fri, 19 Nov 2004, Yannick PODGORSKI wrote:
>
> > Hi Wolfgang,
> > thanks for your answer but it doesn't work
> > with "RAMPZ = 1" or "RAMPZ = 0".
> > I try this before but nothing.
> > I try again to put the section .text at the address 0x0
> > and it works with "RAMPZ = 1" AND "RAMPZ = 0".
> > It's strange because this bit allow me to access to upper
> > or lower flash and I can access whatever the RAMPZ is.
> > Thanks.
> >
> > Yannick
> >
> >
> > > On Fri, 19 Nov 2004, Wolfgang Quack wrote
> >
> >
> > > Hi Yannick,
> > >
> > > Just put "RAMPZ = 1;" in front of fprintf_P(...)
> > >
> > > You need this, because the const's are now in the upper space or flash.
> > >
> > > Wolfgang