Hello Don Pancoe!
Why do you think you'll need an IRQ for the "abort" button?
Drop Adafruit_BBIO! Just setup the GPIO in libpruio and poll the state in
your main loop (or in a timered thread).
Regards
donp...@gmail.com schrieb am Montag, 1. März 2021 um 19:27:01 UTC+1:
> Hello all,
>
> I have a BBB Python application (PCBA test fixture) where I am using
> libpruio, specifically for access to the eCAP pins. Libpruio requires that
> the universal cape be disabled, but when I needed a UART and I2C, I was
> able to add those back in using the existing dtbo files from /lib/firmware
> (shown below) in my uEnv.txt.
>
> uboot_overlay_addr0=/lib/firmware/BB-I2C1-00A0.dtbo
> uboot_overlay_addr1=/lib/firmware/BB-UART4-00A0.dtbo
> uboot_overlay_addr2=/lib/firmware/DP-GPIO-PCBATest-00A0.dtbo (I talk
> about this below)
>
>
> Now I want to add an "abort" button to the test fixture since the
> technicians have reported it takes a lot of time to reset if the board
> under test locks up. I expect that wiring a pushbutton to a GPIO with an
> interrupt is the way to handle this, and I've been thinking that there are
> two ways to get there.
>
> 1. Include another dtbo file to add a single GPIO that I can then
> access with Adafruit_BBIO (this is where my efforts have focused so far),
> or
> 2. Figure out how to work with the hardware-based IRQ of the PRU with
> libpruio (which I've been avoiding because it looks even more scary)
>
> I've tried to make a custom dtbo by following an example from Derek Molloy
> (github.com/derekmolloy/boneDeviceTree) and while it compiled and booted
> OK, I still get the following error when I run a simple test program. The
> same error as when I tried running the program before I created the dtbo.
>
> kapsul@beaglebone:~/pyDev$ sudo python3 abortTest.py
> Traceback (most recent call last):
> File "abortTest.py", line 6, in <module>
> GPIO.setup("P9_12", GPIO.IN)
> ValueError: Set gpio mode failed, missing file or invalid permissions.
>
>
> Further, when I do the following (with or without the dtbo), I get the
> following...
>
> kapsul@beaglebone:~/pyDev$ config-pin -q p9.12
> P9_12 pinmux file not found!
> Cannot read pinmux file: /sys/devices/platform/ocp/ocp*P9_12_pinmux/state
>
>
> Any input would be appreciated, whether it is correcting me on path 1 or
> steering me towards path 2. I will happily provide any additional info, but
> I didn't want to start uploading stuff until I know what, exactly, will be
> helpful.
>
> Thanks,
> --
> Don Pancoe, P.E.
> Industrial Designer, Electrical Engineer
> DonPancoe.com <http://donpancoe.com/>
>
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