Re: [avr-gcc-list] Trick for creating WYSIWYG bitmaps in C [was: howto specifiy a binary constant]

[Dave Hansen]

From: "Bob Paddock" <address@hidden>

> I thought I'd try this bitmap 'trick' via copy&paste of the
> #defines and code into the file I was working on, this is what I get:
>
> Name/name.c:692: error: `sXXXXXX__' undeclared here (not in a function)
> Name/name.c:692: error: initializer element is not constant
> Name/name.c:692: error: (near initialization for `lcd_char_P[0]')
> Name/name.c:693: error: `sX_____X_' undeclared here (not in a function)
> Name/name.c:693: error: initializer element is not constant
> [snip rest of the bitmap erros]
>
> Is this 'trick' compiler or compiler option dependent?
[...]
> > #define X )*2+1
> > #define _ )*2
> > #define s ((((((((0 /* 8 parens for 8 bit, 16 for 16,
> > etc) */
> >
> > Then you just "draw" your bitmap as such:
> >
> > uint8_t lcd_char_P[] =
> > {
> >   sXXXXXX__,
> >   sX_____X_,
> >   sX______X,
> >   sX_____X_,
> >   sXXXXXX__,
> >   sX_______,
> >   sX_______,
> >   sX_______
> > }

I think it will work if you change the above to

uint8_t lcd_char_P[] =
{
  s XXXXXX__,
  s X_____X_,
  s X______X,
  s X_____X_,
  s XXXXXX__,
  s X_______,
  s X_______,
  s X_______
}

But I haven't tried it myself.  Regards,
  -=Dave