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RE: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex
From: |
Schwichtenberg, Knut |
Subject: |
RE: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ? |
Date: |
Thu, 5 Feb 2009 08:10:32 +0100 |
As far as I know hex values won't work as expected but octal does!
I used:
static char s46[] __attribute__ ((progmem)) = "Hei\342gas"; /* 46 */
which is written as "Heißgas" on an LCD.
Knut
> -----Original Message-----
> From:
> address@hidden
> g
> [mailto:address@hidden
ongnu.org] On Behalf Of Chris Kuethe
> Sent: Thursday, February 05, 2009 8:07 AM
> To: David Brown
> Cc: address@hidden
> Subject: Re: [avr-gcc-list] Re: Strings: escape sequence to
> insert arbitrary hex value ?
>
> #include <stdio.h>
>
> int main(){
> char *m = "try use
> \x68\x65\x78\x20\x65\x73\x63\x61\x70\x65\x73\x3f";
>
> printf("%s\n", m);
> return 0;
> }
>
> On Wed, Feb 4, 2009 at 11:58 PM, David Brown
> <address@hidden> wrote:
> > Vincent Trouilliez wrote:
> >>
> >> On Thu, 5 Feb 2009 15:18:44 +1030
> >> "Daniel O'Connor" <address@hidden> wrote:
> >>
> >>> You can define it like so..
> >>> #define LCD_CUSTOM_CHAR_FOO "\012"
> >>>
> >>> then you can do..
> >>> char example[] = "foo" LCD_CUSTOM_CHAR_FOO "bar";
> >>>
> >>> You might be able to do something more clever but I don't
> know how :)
> >>
> >>
> >> Thanks Daniel (and Ivan as well, off-list), that worked a
> treat ! :-)
> >>
> >> Only drawback I found, is that I must now have TWO
> #defines for each and
> >> every custom character: one #define to represent the character as a
> >> string, so I can embed it into a string, and also all the
> #defines I
> >> already had, which represent the actual numerical value, for when I
> >> need to print an individual/discrete character rather than print a
> >> string. It's not the end of the world, but not very
> elegant either, so
> >> if anybody has a solution to make do with only one define
> per character,
> >> I am all ears ;-)
> >>
> >
> > An alternative idea is to find an ASCII character that you
> don't need
> > otherwise (say, "~"), and use it in your strings. Then do
> on-the-fly
> > conversion when outputing the strings:
> >
> > char example[] = "foo~bar";
> >
> > void lcdWriteString(const char* p) {
> > while (char c = *p++) {
> > if (c == '~') {
> > lcdWriteChar(LCD_CUSTOM_CHAR_FOO);
> > } else {
> > lcdWriteChar(c);
> > }
> > }
> > }
> >
> > As long as you don't have too many, the overhead won't be
> bad (and the
> > substitute characters won't be too confusing). It should
> also work with
> > characters >= 128 as the substitutes, I believe.
> >
> >
> >
> >
> >
> > _______________________________________________
> > AVR-GCC-list mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
> >
>
>
>
> --
> GDB has a 'break' feature; why doesn't it have 'fix' too?
>
>
> _______________________________________________
> AVR-GCC-list mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
>
- [avr-gcc-list] Strings: escape sequence to insert arbitrary hex value ?, Vincent Trouilliez, 2009/02/04
- Re: [avr-gcc-list] Strings: escape sequence to insert arbitrary hex value ?, Daniel O'Connor, 2009/02/05
- Re: [avr-gcc-list] Strings: escape sequence to insert arbitrary hex value ?, Vincent Trouilliez, 2009/02/05
- [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, David Brown, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Chris Kuethe, 2009/02/05
- RE: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?,
Schwichtenberg, Knut <=
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Chris Kuethe, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Juergen Harms, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, David Kelly, 2009/02/05
- RE: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Dave Hansen, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Vincent Trouilliez, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary, lucio, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary, Jim Brain, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary, Vincent Trouilliez, 2009/02/05
- Re: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, David Kelly, 2009/02/05
- RE: [avr-gcc-list] Re: Strings: escape sequence to insert arbitrary hex value ?, Dave Hansen, 2009/02/05