Hi Nicholas,
according to what I understood, you want to use the data coming from
your ADCs in a userspace application which implements the control loop.
I think there is a good chance you can then do all the steps (1)-(3)
within an userspace application. However, I am not 100% certain about
the best solution to implement (2) on this setup. May be anybody else
knows something about the maximum sample frequency, but this also
depends on how complicated your algorithms are.
Here [1] you can find a good example on how to write a RT userspace
application. Using the SPI character devices it should also be
possible to talk to your hardware.
Regards,
Andre
[1] https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO
Thanks, Andre; that is a very good link, and thank you for the
information. I am hoping that I can sample from the ADCs at a rate of
at least 1 kHz, and I am wondering if it is best to do this in a
userspace program or in a kernel driver.
My processing algorithms are not very complicated. If one of the ADC
data values is greater than a certain value, then a digital-to-analog
converter (DAC) control register is updated. All that I want to do is
to collect data at a rate of 1 kHz by toggling a port pin and then
reading the data values over SPI.
Nicholas
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