Some other processors gpio have a mode internal pull ups  it's worth checking 
for in TRM section on GPIO as well as all modes that pin can be set up for 
maybe someone's using it.

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  On Mon, May 11, 2020 at 5:26 PM, John Allwine<j...@pocketnc.com> wrote:   
When I manually wire a pull up resistor, I still am not able to detect a high 
signal using the methods I listed, though I can verify with a multimeter that 
P9.13 is high. 

On Monday, May 11, 2020 at 3:17:36 PM UTC-6, John Allwine wrote:
I'm trying to configure P9.13 on the Beaglebone AI as an input pull up, but am 
not having any success. In the System Manual it lists P9.13a as not being bound 
to a GPIO port, but P9.13b is bound to GPIO6_12. This is the device tree 
overlay I'm using with line 56 showing how I'm attempting to configure P9.13b 
(and P9.13a the line above it). Am I doing something wrong in my device tree 
overlay? I've had success configuring many other pins, but P9.13 is giving me 
trouble for some reason.
I'm testing it a couple ways:1) with sysfsecho 172 > /sys/class/gpio/exportcat 
/sys/class/gpio/gpio172/value

2) with libgpiogpioget gpiochip5 12
Both return a value of 0, when I'd expect it to be 1 (I don't have anything 
wired to it). Any idea what I'm doing wrong?


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