Orbitty Carrier and Jetson TX2: GPIO pins

The documentation at: https://www.balena.io/docs/learn/develop/hardware/gpio/

only discusses the Raspberry Pi, Beaglebone and Intel Edison. Each appear to use a different interface between user space and GPIO pins.

Is there any support for the Orbitty Carrier and Jetson TX2?

Test device at: https://dashboard.balena-cloud.com/devices/c7bd659a97a097938bb5ad359cd4d0cb/summary

Actually my colleague figured it out:

The Orbitty carrier board we are using with the Jetson TX2 has an expansion port with an I2C bus and four GPIO pins. Further reading here:

https://www.kernel.org/doc/Documentation/gpio/sysfs.txt

https://elinux.org/Jetson/Tutorials/GPIO

http://www.connecttech.com/pdf/CTIM-ASG003_Manual.pdf

We are going to use a GPIO pin to control a LED. The GPIO pin connects to the gate on the BS170 MOSFET which drives our LED.

First we enable the four pins… You only need to do this once.

echo 388 > /sys/class/gpio/export
echo 298 > /sys/class/gpio/export
echo 480 > /sys/class/gpio/export
echo 486 > /sys/class/gpio/export

This will create four directories

/sys/class/gpio/gpio388
/sys/class/gpio/gpio298
/sys/class/gpio/gpio480
/sys/class/gpio/gpio486

In the above order those directories correspond to GPIO pins 0-3, which are pins 7-10 on the Orbitty expansion connector. We are using pin #8 on the connector to control the LED, so we’re interested in gpio298.

Once you have enabled the pins, you can set pin a pin’s direction like this

echo out > /sys/class/gpio/gpio298/direction

Or

echo in > /sys/class/gpio/gpio298/direction

The first command will have the effect of turning the LED off by switching to output mode which defaults to low. You can turn the LED back on with the second command.

You can also turn the LED back on with this command

echo 1 > /sys/class/gpio/gpio298/value

And back off again with this one:

echo 0 > /sys/class/gpio/gpio298/value

Finally, you can read the state of the GPIO pin with the command:

cat /sys/class/gpio/gpio298

Thank you @jason10 for answering your question and sharing the information on the forum.

Cheers :tada: :confetti_ball: