Re: [avr-gcc-list] why does this not work?!?

[Torsten Mohr]

Hi,

thanks!!!

That was exactly the problem.  I did not think that i have to give this value
to the linker too.


Best regards,
Torsten.


> I added
> avr-objdump -h -S qwe.ELF >  qwe.LST
> to the build sequence, and the LST shows too few jump vectors.
> Adding -mmcu=atmega128 to the linker - 2nd avr-gcc line - seems to fix
> this. Ben
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> Torsten Mohr
> Sent: Wednesday, 8 June 2005 8:11 AM
> To: address@hidden
> Subject: [avr-gcc-list] why does this not work?!?
>
> Hi,
>
> i use binutils-2.15, gcc-3.4.4 and avr-libc-1.2.3
>
> I tracked down a certain problem to the attached example code.
> There are two switches on PB2 and PB3 and there are two LEDs
> on PB4 and PB5.
> Sometimes the code after the simple for() is reached (what i expect, "it
> works"), sometimes not.  I see this on the patterns the LEDs show.
>
> - If i use "i" as a global variable, the for() does not seem to exit.
> - If i use "i" as the local variable, defined in main() it works.
> - If i use "i" as a global variable and set the limit in the for() from 2
> to 1
> it works.  That way the exit condition for for() is met immediately.
>
> This must be some really stupid bug i wrote, but i don't see it at the
> moment.
>
> It would be great if anybody could give me some hints on this one.
>
>
> Best regards,
> Torsten.
>
>
> I compile with these commands:
>
> avr-gcc -I /opt/avr/avr/include/avr -mmcu=atmega128 -Wa,-ahnls=qwe.s -c \
> qwe.c -O0 -oqwe.o
> avr-gcc -I /opt/avr/avr/include/avr -o qwe.elf qwe.o
> avr-objcopy -O srec qwe.elf qwe.hex
>
>
> ------------------- example code:
> #include <io.h>
> #include <wdt.h>
> #include <interrupt.h>
>
> #define L1 0x10
> #define TMASK 0x0c
> #define LMASK 0x30
>
> volatile unsigned int i;
>
>
> int main(void) {
>   //volatile unsigned int i;
>
>   cli();
>   wdt_disable();
>
>   DDRB = LMASK;
>   PORTB = TMASK | L1;
>
>   for(i = 0; i < 2; i++);
>
>   PORTB = TMASK | LMASK;
>
>   do {
>     i++;
>   } while(1);
>
>   return 0;
> }
>
>
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