RE: [avr-gcc-list] Strings in ROM

[Stu Bell]

Check out
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=38003

Best regards, 

Stu Bell 
DataPlay (DPHI, Inc.) 

 

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden 
> On Behalf Of Robert von Knobloch
> Sent: Friday, March 13, 2009 6:51 AM
> To: address@hidden
> Subject: [avr-gcc-list] Strings in ROM
> 
> Dear GCC-List,
> 
> I am writing an application that uses loadable portions of 
> code (it is a tester for embedded products, where the target 
> code and test routines will be sent to a remote location [the 
> factory] and loaded into the tester via an Intel Hex download 
> routine]. These 'test modules' are in pre-defined memory 
> areas of the processor (Mega644), so no contention occurs. 
> Writing these loadable modules requires that I only use 
> resources inside these memory areas. I need to output strings 
> to an LCD display in these modules. Clearly printf 
> "something" would require entries in the base .text area 
> which would move my main routines. I want to use 'prog_char[] 
> ="Something", but the compiler won't let me put this in a section.
> 
> e.g.
> 
> #define SECTION TEST1_SECTION
> 
> SECTION prog_char press_button[]    = ">>  Press UUT button  <<";
> SECTION prog_char button_timeout[]  = "*** Error - Timeout! ***";
> 
> where the linker sees:
> LDFLAGS       = -Wl,-Map,$(PRG).map \
>         -Wl,--section-start=.test0=0x2600 \
>         -Wl,--section-start=.testparms0=0x2e80 \
>         -Wl,--section-start=.test1=0x2f00 \
>         -Wl,--section-start=.testparms1=0x3780
> 
> 'make' results in:
> 
> avr-gcc -g -Wall -Os -mmcu=atmega644 -DF_CPU=20000000      -c 
> -o main.o
> main.c
> In file included from main.c:25:
> tests.c:138: error: section of 'press_button' conflicts with 
> previous declaration
> tests.c:139: error: section of 'button_timeout' conflicts 
> with previous declaration
> 
> I cannot find where 'prog_char is defined and would like to 
> know how I can force the compiler to put these strings in my 
> 'test1' section.
> 
> Many thanks,
> 
> Robert
> 
> 
> 
> 
> 
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