Jetson GPIO pin read/write don't add up

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

I’m having issues where i’m getting a gpio.LOW when it should be gpio.HIGH and vise-versa.

I have a magnet sensor connected from pin 22 to pin 24 and is set pin 22 as output and pin 24 as input. I write a gpio.HIGH on pin 24 and if the magnet sensor is connected I then later can read a gpio.HIGH on pin 22. This works for a while but then something goes wrong i’m getting gpio.HIGH even if the magnet sensor is not connected. Any ideas? I tried doing it with a pull up-resistor but couldn’t get it to work so that’s why i chose this route.

Here is the sensor: Magnetic contact switch (door sensor) : ID 375 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits

3

hello felleman,

is there any kernel failure logs for reference?

4

Hello Jerry,

I’m not seeing any failures in kern.log, but i’m not sure what i’m looking for. I attached the logs for March 16 where we saw the issue. Thanks

mar_16_kern.log (623.7 KB)

5

hello felleman,

please refer to NVIDIA Jetson AGX Xavier GPIO Header Pinout, are you using pin-22/gpio-417 and pin-24/gpio-494 for hardware connections?

are you able to enter the location of the GPIOs, /sys/class/gpio and control the GPIO via sysnode?
for example,
enter the path as using # echo 417 > export to generate gpio417 name, then you’ll be able to enter /sys/class/gpio/gpio417/ for controlling the pin.
please have a try, thanks

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