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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