Re: [avr-gcc-list] BUG in WINAVR?

[Royce Pereira]

hi,
so what was the problem?
--royce

On Sat, 12 Aug 2006 08:00:36 +0530, Trampas <address@hidden> wrote:

> I went and rewrote the code and it all works now.
>
> Trampas
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> Trampas
> Sent: Friday, August 11, 2006 9:03 PM
> To: address@hidden
> Subject: [avr-gcc-list] BUG in WINAVR?
>
> I think I have found a bug in GCC for the AVR.
>
> Here is the snip of code
>
>                       
>               #define K_IN ((PIND>>2) & 0x01)
>               while(K_IN==1)  //spin waiting on sync bit
>               {
>                       if (TCNT3L>250)
>                       {
>                               timeMs=timeMs+1;
>                               TCNT3L=0;
>                       }
>                       if (timeMs>time_out_ms )
>                       {
>                               if (index==0)
>                               {
>                                       printf("Error: ISO get time
> out\n\r");
>                               }
>                               ENABLE_INTERRUPTS();
>                               return index;
>                       }
>
>               }
>
>> From stepping though the code it appears that the test for K_IN==1 is done
> at the end of the loop, and it appears that compiler thinks the end of the
> loop is at the return. Thus the code times out each and every time I run it.
>
>
> The only way I could debug the code was put a break point on the IN assembly
> instruction and it appears to only be called once.
>
> FYI this is in the April 2006 build of WinAVR.
>
> Trampas
>
>
>
>
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