AVR-Chat

Tom wrote:
> Again:    avrgcc 4.3, AVRStudio 4.31 Service Pack 1.
> 
> Following code: 
>       
> asm volatile (
> 
>     "    ldi    R16,    %0    \n"
>     "    ldi R17,    %1    \n"
>     "    ldi R18,    %2    \n"
>     "    ldi    R19,    %3    \n"
> 
>     "    mov    %3,    R19        \n"
>     "    mov    %2,    R18     \n"
>     "    mov    %1,    R17        \n"
>     "    mov %0,    R16        \n"
> 
>      : "=r" (var1) , "=r" (var2) , "=r" (var3) , "=r" (var4):
>        "0" (var1) , "1" (var2) , "2" (var3) , "3" (var4) :
>        "r16", "r17", "r18", "r19" );
> 
>  Generates the following, verymysterious errors:
> 
> embedded_asm.o: In function `main':
> C:\Users\avrFreak\Documents\embedded_asm\default/../embedded_asm.c:51: 
> undefined reference to `r22'
> C:\Users\avrFreak\Documents\embedded_asm\default/../embedded_asm.c:51: 
> undefined reference to `r23'
> C:\Users\avrFreak\Documents\embedded_asm\default/../embedded_asm.c:51: 
> undefined reference to `r30'
> C:\Users\avrFreak\Documents\embedded_asm\default/../embedded_asm.c:51: 
> undefined reference to `r31'
> make: *** [embedded_asm.elf] Error 1
> Build failed with 4 errors and 0 warnings...
> 
> 
> None of R22, R23, R30 or R31 are referenced explicitly ANYWHERE in this 
> code, and the "0", "1" positional references shouldn't generate oddball 
> labels like that, regardless. IIRTFMC, the "0", "1", "2", "3" should 
> sequentially reference R16, R17, R18 and R19.
> 
> (per documentation found @ 
> http://www.nongnu.org/avr-libc/user-manual/inline_asm.html )

Try using lowercase "r" instead of "R".