Dean
Wed Jul 19 13:44:27 CDT 2006
Not to my knowledge. I've never seen that recommended, and haven't thought
about it might work.
The point might be that if you're using shared interrupts then you should be
using NKCallIntChain to handle the sharing. What it doesn't say is that you
also need some way to cause another interrupt to be generated so
NKCallIntChain will be able to do it's job.
--
Dean Ramsier - eMVP
BSQUARE Corporation
"at" <at@hotmail.com> wrote in message
news:OEKYXP1qGHA.3256@TK2MSFTNGP04.phx.gbl...
> Point taken Dean, what advantage does using Shared interrupts
> via NKCallIntChain give over simply acknowledgin the GPIOXX_2
> interrupt (not disabling) in the ISR. Does it solve the re-entrancy issue?
>
>
> "Dean Ramsier" <ramsiernospam@nospam.com> wrote in message
> news:e9VbxI1qGHA.3380@TK2MSFTNGP04.phx.gbl...
>>> Once the interrupt is processed reeenable the
>>> interrupt at the device say in the InterruptDone. Pending interrupts in
>>> the device will raise an edge again. This solves missing edges and
>>> reentrancy
>>
>> You said you have level interrupts. Re-enabling the interrupts at the
>> device will not cause an edge, they remain at level. Since the CPU
>> doesn't support level interrupts you don't get interrupted again to
>> service the remaining interrupt.
>>
>> --
>> Dean Ramsier - eMVP
>> BSQUARE Corporation
>>
>>
>> "at" <at@hotmail.com> wrote in message
>> news:OZ$s4T0qGHA.5108@TK2MSFTNGP05.phx.gbl...
>>> Hi, i have the common scneario in that i have a few level triggered
>>> ints wired in to one of the PXA270 GPIOXX_2 lines. I have seen in the
>>> archives a suggested solution is to treat this as a shared interrupt
>>> and call NKcallIntChian. I was wondering why this complexity
>>>
>>> Can it not jut be done by in the ISR checking the GPIOXX_2
>>> bit in the ICMR then further checking which one of the io lines
>>> it is. Then disabling the interrupt at the peripheral device, this
>>> prevents
>>> rentrency in to the IST. Once the interrupt is processed reeenable the
>>> interrupt at the device say in the InterruptDone. Pending interrupts in
>>> the device will raise an edge again. This solves missing edges and
>>> reentrancy
>>> issues surely or have i missed something?
>>>
>>> I thought NKcallInt Chain was more for PCI devices where you have
>>> different cards plugged in at any give time. In my scenario i have fixed
>>> hardware.
>>>
>>>
>>
>>
>
>