Julien Chevalier wrote:

> Hello,
> 
> I use quartus II 4.00 and SOPC builder 4.00 to build a NIOS system on a
> Stratix II board.
> I enabled the support for external interruptions, add a user defined IP
> connected via the provided avalon ahb bridge.
> Everything is ok.
> Then I try to use the interruption of the bridge, everything on the wire
> is ok until the data_master_irq gets high. The iq number is ok, NIOS
> makes a couple of instructions more and then stops on a strange adress
> (totallly out of the memory map). but it doesn't fetch the ISR code
> indeed. The soft uses nr-installusr and is exactly the same as the
> examples provided.
> 
> I tried whithout any soft isr and initialisation to see if i get the
> famous message ... but nothing.
> 
> How can I be sure of what is done by the compiler, is there any
> restriction that I don't respect ? thanks for all your help and
> experience about those interrupts on NIOS systems.

I've seen the Avalon interrupt controller act up if the interrupt signal
isn't synchronized by at least 1 FF in the NIOS's clock domain. It
generates a random-ish interrupt number that seems to be <highest defined
IRQ>+1.

Ben

Try this.  Go back to SOPC Builder and reset all of your addresses, IRQ's,
and reset and vector table, etc. addresses - even if they haven't changed.

Then rebuild your system.

One thing that I do is put my vector table in its own small on-chip ram to
protect it and make sure interrupts are as fast as possible.

You might want to check out www.niosforum.com to share Nios info.

Ken

"Julien Chevalier"
<translate_to_french_the_word_knight_and_add_a_j@voila.fr> wrote in message
news:ca9jc4$jr4$1@s1.read.news.oleane.net...
> Hello,
>
> I use quartus II 4.00 and SOPC builder 4.00 to build a NIOS system on a
> Stratix II board.
> I enabled the support for external interruptions, add a user defined IP
> connected via the provided avalon ahb bridge.
> Everything is ok.
> Then I try to use the interruption of the bridge, everything on the wire
> is ok until the data_master_irq gets high. The iq number is ok, NIOS
> makes a couple of instructions more and then stops on a strange adress
> (totallly out of the memory map). but it doesn't fetch the ISR code
indeed.
> The soft uses nr-installusr and is exactly the same as the examples
> provided.
>
> I tried whithout any soft isr and initialisation to see if i get the
> famous message ... but nothing.
>
> How can I be sure of what is done by the compiler, is there any
> restriction that I don't respect ? thanks for all your help and
> experience about those interrupts on NIOS systems.
>
> Sincerely
>
> Julien Chevalier

Hello,

I use quartus II 4.00 and SOPC builder 4.00 to build a NIOS system on a 
Stratix II board.
I enabled the support for external interruptions, add a user defined IP 
connected via the provided avalon ahb bridge.
Everything is ok.
Then I try to use the interruption of the bridge, everything on the wire 
is ok until the data_master_irq gets high. The iq number is ok, NIOS 
makes a couple of instructions more and then stops on a strange adress 
(totallly out of the memory map). but it doesn't fetch the ISR code indeed.
The soft uses nr-installusr and is exactly the same as the examples 
provided.

I tried whithout any soft isr and initialisation to see if i get the 
famous message ... but nothing.

How can I be sure of what is done by the compiler, is there any 
restriction that I don't respect ? thanks for all your help and 
experience about those interrupts on NIOS systems.

Sincerely

Julien Chevalier