URL:
<http://savannah.nongnu.org/bugs/?36933>
Summary: Documentation no longer correctly describes how to
declare strings for storage in program memory
Project: AVR C Runtime Library
Submitted by: codinghead
Submitted on: Tue 24 Jul 2012 09:44:17 GMT
Category: Documentation
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Documentation
Status: None
Percent Complete: 0%
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Release: 1.8.0
Fixed Release: None
_______________________________________________________
Details:
The documentation page as described below no longer correctly describes how to
define strings that are to be stored in program memory using the PGM_P and
PROGMEM definition s.
This issue occurs when moving from version 1.7.1 to 1.8.0.
Description of the issue with the 1.8.0 library and how to solve it below.
> The strings were defined as per the AVR Libc homepage -
> http://www.nongnu.org/avr-libc/user-manual/pgmspace.html
>
> They suggest:
> char string_1[] PROGMEM = "String 1";
> char string_2[] PROGMEM = "String 2";
> char string_3[] PROGMEM = "String 3";
> char string_4[] PROGMEM = "String 4";
> char string_5[] PROGMEM = "String 5";
>
> PGM_P string_table[] PROGMEM =
> {
> string_1,
> string_2,
> string_3,
> string_4,
> string_5
> };
>
> However, on compiling my code I received the following error for each such
defined line of code:
>
> Error 1 variable 'string_B01' must be const in order to be put into
read-only section by means of '__attribute__((progmem))'
>
> Changing the code to the following resolves the issue:
>
> const char string_1[] PROGMEM = "String 1"; const char string_2[]
> PROGMEM = "String 2"; const char string_3[] PROGMEM = "String 3";
> const char string_4[] PROGMEM = "String 4"; const char string_5[]
> PROGMEM = "String 5";
>
> PGM_P const string_table[] PROGMEM =
> {
> string_1,
> string_2,
> string_3,
> string_4,
> string_5
> };
_______________________________________________________
Reply to this item at:
<http://savannah.nongnu.org/bugs/?36933>
_______________________________________________
Message sent via/by Savannah
http://savannah.nongnu.org/
_______________________________________________
AVR-libc-dev mailing list
AVR-libc-dev@nongnu.org
https://lists.nongnu.org/mailman/listinfo/avr-libc-dev
