Re: [Xenomai-help] Where did my interrupts go?

[Jan Kiszka <jan.kiszka@domain.hid>]

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Sean McGranaghan wrote:
> Hello all,
> 
> I have been writing an RTDM driver for an ISA (PC/104) based DAQ board. I had 
> the initial driver working under a very old trunk snapshot (Rev 464). This 
> morning I upgraded to the latest trunk. I put a few small fixes into my driver 
> and test application to take care of some deprecated functions and constants. 
> (rt_queue_recv() and RT_IRQ_ENABLED). It appears that my driver is no longer 
> receiving interrupts. I can see the irq line go active on the oscilloscope but 
> it is never cleared and it appears my interrupt handler is never called.
> 
> I ran the test suite including xeno-test with no problems. Attached are output 
> files from dmesg, xeno-config and xeno-test outputs. My kernel config file is 
> also attached.
> 
> At this point I think I need to turn on some debugging in the kernel. Which 
> debug options would be appropriate here?.
> 

First of all, what does /proc/xenomai/irq tell you about your DAQ IRQ?
Is it registered correctly? Are there any arrivals noted?

Then double-check if you pass the correct code on return from the IRQ
handler: either RTDM_IRQ_HANDLED (if that IRQ was for you - standard),
or RTDM_IRQ_NONE. Nothing else (RT_IRQ_ENABLE is "native stuff", i.e.
violates the rule to keep your driver clean from non-RTDM APIs).

Regarding debugging options: CONFIG_XENO_OPT_DEBUG_RTDM is highly
recommended for drivers under development.

Jan


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