Re: [ECOS] spurious interrupts on scanf

[Christian Mueller <cmueller at lpr dot e-technik dot tu-muenchen dot de>]

Hello again,

thanks a lot for quick answer...
You were right, it was not the scanf...
But some interesting thing, someone might find quite odd...
I will describe it a little bit longer, so everyone gets me right.
I am doing DMA (it is a VGA output of a picture I've got in memory), it 
fetches 300kb 60 times a second into a fifo.
working fine.
If I have it disabled, no spurious interrups occour, but if it is 
running, I get them quite often (I have written an IRQ handler that 
works on an
additional IRQ, firering when there can no interrupt source be identified.
Note: there is no hardware interrupt from me! Nothing from the PLD or so ...
I am not quite sure, but this is a scenario I could imagine:
The UART interrupts (the only ones unmasked that could be responsible) 
are self-resetting, so if there is much traffic on the bus,
the processor might miss them....
anything for my understanding to add?
For practical use I will keep the IRD handler (empty) so nothing will 
bother me, but it leaves some ungood feeling...

thanks

christian müller

Andrew Lunn wrote:

> On Wed, Oct 13, 2004 at 01:53:44PM +0200, Christian Mueller wrote:
>  
>
> > Hello,
> >
> > I am turning round and round....
> >
> > I am working on an ARM Epxa1 with redboot
> > I allways get spurious interrupts when I use scanf(); any ideas what I 
> > could be?
> >    
>
> There is no obvious link between interrupts and scanf. So i guess you
> have overwritten the end of your stack.
>
>        Andrew
>
>  


--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss