Rob Butera wrote:
>
> Hi folks - I have an IRQ question.
>
> My RTLinux application has been debugged and is running great. However, I
> am currently using the RTC to generate my hardware interrupt, and want to
> use my NI AT-MIO-16E-1 board to generated an interrupt at a faster rate.
> ...
> 2) if anyone has any experience register-level programming a National
> Instruments board, I remember some comments in someone's source code
> (comedi?) about some inconsistent IRQ specifications (specifying in the PNP
> configuration versus writing to the appropriate registers) with NI
> boards, but I can no longer find that info. I'd be happy to share
> the details of what registers I've configured to people who know these
> things ...
I'm pretty sure that the PNP settings for the IRQ have no effect. You need to do the
PNP setup so that the I/O ports
are mapped (so you can address the board), but I believe the IRQ and DMA settings are
ignored.
To select interrupts, you have to map the DAQ-STC interrupt to an ISA bus interrupt in
your board setup (i.e. with
register programming). You select the ISA bus interrupt with a three-bit code in the
Interrupt_Control_Register. The
values, 0-7, map onto ISA interrupts 3,4,5,7,10,11,12,15, in order. (You also have to
set the interrupt enable in that
same register.)
This mapping is not explained in the documentation, so it wouldn't surprise me if
that's keeping your interrupts from
working. (In fact, the list may still be wrong; I seem to recall that some of those
IRQ numbers never worked for me.
But NatInst did confirm the list, above...)
If you need some example code, let me know. I can send you a working driver and
application library.
--
Gray Abbott ([EMAIL PROTECTED]) http://www.sofgry.com/Sofgry/
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