Fwd: Re: [En-Nut-Discussion] PPP/AHDLC logic problems...

[Brett Abbott]

Vesa

maybe gcc, maybe not, maybe both gcc and ICC?

I have seen exact symptom this with ICCAVR V6 with optimisation 
recently.  Perhaps it is something uncommon within the NutOS code stream 
- we are both working on ahdlcavr.c and related code.

Is this the problem that goes away when the optimiser is off?

Brett

Vesa Jääskeläinen wrote:

> Here is a requested forward. Some mailing list problems with OP.
>
> -------- Original Message --------
> Subject: Re: [En-Nut-Discussion] PPP/AHDLC logic problems...
> Date: Sun, 8 May 2005 11:36:49 +0200
> From: Matej Kupljen <matej.kupljen at gmail.com>
> Reply-To: Matej Kupljen <matej.kupljen at gmail.com>
> To: Vesa Jääskeläinen <chaac at nic.fi>
> CC: Ethernut User Chat (English) <en-nut-discussion at egnite.de>
>
> HI
>
>> > I added the code to ahdlcavr.c proposed in the patch, and also the
>> > printf("....") on the start of the AhdlcRx thread and on the end of 
>> the
>> > thread. It seems that the thread starts as soon as you register the
>> > device, BUT IT NEVER EXITS!
>>
>> For this I would like to ask what compiler you are using :) and what
>> optimization settings when compiling Nut/OS & Nut/Net ?
>>
>> I noticed that if I used WinAVR 20050214 with optimizations turned on
>> (default), it fails to exit PPP mode but if I disable optimizations it
>> gets nicely out of it.
>
>
>
> EXACTLY!!
>
> Last night (around 03:00 AM) I was debugging the problem, why the
> thread won't exit, and now I think I have a tool chain problem :-(
>
> If I add three printf's into the ahdlcavr.c into the case statement, one
> before IF statement, one if IF is true and one if IF is false it WORKS!
> I can't believe that I have spent 4 days (and nights) just to find out
> that it can be compiler problem :-(
>
> Oh, I am using gcc tool chain, which I have build my self.
> (There is a great article in one of the Linux journal)
> I am using:
> binutils - 2.15
> gcc - 3.3.5
> avr-libc - 1.0.5
>
> Because I don't know the AVR assembler, I can tell if this is a
> compiler or assembler bug. I'll try to upgrade the compiler first
> and see if things change.
>
> BR,
> Matej
>
> _______________________________________________
> En-Nut-Discussion mailing list
> En-Nut-Discussion at egnite.de
> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
>
>

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