Re: [avr-gcc-list] Initilizing complex const arrays : syntax ?

[gouy yann]

Hi all,

Vince, my corrections are in your code, go down and see!!

the problem is, somehow, you double instantiate your structure.

regards
   Yann

--- Vincent Trouilliez <address@hidden> a écrit :

> Thanks guys for the help,
> 
> 
> I appear to have one last little problem about this :
> 
> if I do as David did, that is declare my array in main.c, then it works
> fine. If I declare the array in ui.h ("ui" stands for User Interface in
> my case), and include ui.h in main.c, then it's good too. However if I
> do as intended, that is, create an ui.c file which will contain
> functions that make use of the array defined in ui.h, well.....in this
> case main.c and ui.c compile fine, but the linker will fail sadly :-/
> 
> $make
> avr-gcc -O -g -Wall -ffreestanding -mmcu=atmega32 -c main.c
> avr-gcc -O -g -Wall -ffreestanding -mmcu=atmega32 -c ui.c
> avr-gcc -o object.elf -O -g -Wall -ffreestanding -mmcu=atmega32
> -Wl,-Map,object.elf.map -Wl,--section-start=.eeprom=00810001 main.o ui.o
> ui.o(.progmem.data+0x0): multiple definition of `param_list'
> main.o(.progmem.data+0x0): ~/avr/Projects/test2/main.c:3: first defined
> here
> make: *** [object.elf] Error 1
> 
> 
> I can't make sense of the error messages.
> I did notice that it does link fine, if I comment out the "include
> ui.h" in ui.c, but you just all taught me the other day to always
> include foo.h at the top of foo.c, when writing a module, which makes
> sense since modules are compiled independently so need their .h file to
> be complete. So I am lost again...
> 
> 
> Regards,
> 
> 
> --
> Vince
> 
> 
> 
> The complete test program is as follows, can't make it simpler :
> 
> 
> main.c
> ------
> 
> #include "ui.h"
> 
> void main (void){
> 
> }
> 
> ui.c
> ----
> #include "ui.h"

// your structure instatiation

const struct param __ATTR_PROGMEM__ param_list[] = {
        { "Throttle", "  %", "%2d" },
        { "Eng. Speed", "RPM", "%4d" },
        { "M. A. T.", " °C", "%2d" },
        { "M. A. P.", "Bar", "3.2f"}
};


> 
> 
> ui.h
> ----
> 
> #include <avr/pgmspace.h>
> 
> //data type for one engine parameter
> struct param {
>       char    desc[11];                       
>       char    unit[4];
>       char    format[6];
> };
> 
> 

// your structure declaration

extern const struct param __ATTR_PROGMEM__ param_list[];

> 
> 
> 
> 
> 
> _______________________________________________
> AVR-GCC-list mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
> 



        

        
                
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