Re: [Xenomai-help] Loosing serial interrupt

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

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Tomas Kalibera wrote:
> Hi Jan,
>> Try to pass I_EDGE to rt_intr_create. The UART IRQs are edge-triggered,
>> so you have to enable the appropriate handling at kernel IRQ handler 
>> level.
>>
>> Jan
>>   
> 
> I'm calling rt_intr_create from user space, so I cannot specify I_EDGE. 
> But even if I could, looking at the code I assumed that I_EDGE was only 
> applicable together with I_SHARED, and should be only used when I need 
> to share and edge IRQ among multiple rt_intr objects/interrupt 
> handlers.  Is that correct ?

Yeah, that was nonsense. It's a shared-IRQ thing, and those won't work 
via the native API anyway.

If you can identify a point when something interesting just happened 
(which means much less than 10 seconds ago), try placing a 
xntrace_user_freeze() at that location and use the I-pipe tracer to 
analyse the history of the system (of the last few milliseconds). That 
can help to understand what does or does not go on at lower levels. Find 
more infos on the tracer in the wiki.

BTW, there is also a test case available for IRQ delivery via 
null-modem, check irqbench. It doesn't use the rt_intr API, but the same 
hardware.

Jan


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