tmkasun / jetson-tk1-gpio

Python GPIO library for Jetson TK1*

Intro

This is a python library for interacting with Nvidia Jetson TK1 GPIO. This library is ^*specifically for Jetson TK1 only and not for other versions, If you are looking for a GPIO library for other Jetson variant checkout this repository

I have built this around the sysfs interface for GPIO's and inpired by the NVIDIA's official GPIO library for TX1, TX2, Nano etc Jetson versions.

Setup file system permission

Please follow the guide in NVIDIA/Jetson-GPIO readme to setup file system permissions

Usage

This library provides a GPIO class definition which you can create gpio objects out of that, An instance work as one GPIO pin and you can, setup, set data flow direction(mode), output status that is, if out direction whther output needs to be high(~1.8v) or low(~0.0v) etc and finaly cleanup the GPIO pin(unexport).

• To initialize a GPIO pin (Create an GPIO object), You need to provide, sysfs filename number (i:e if gpio165 give 165) as the first argument, and the mode (direction) and optionaly you can provide the output initial state

Port	sysfs filename	Physical pin
GPIO_PH1	gpio57	Pin 50 on J3A1
GPIO_PU6	gpio166	Pin 58 on J3A2
GPIO_PU5	gpio165	Pin 55 on J3A2
GPIO_PU4	gpio164	Pin 52 on J3A2
GPIO_PU3	gpio163	Pin 49 on J3A2
GPIO_PU2	gpio162	Pin 46 on J3A2 (Disabled by default)
GPIO_PU1	gpio161	Pin 43 on J3A2
GPIO_PU0	gpio160	Pin 40 on J3A2

~Source

  fan = GPIO(165,GPIO.OUT)

• Setup pin, This call will export the pin and set the direction as well (if direction is given when creating the GPIO object)

  fan.setup()

• Debug the pin, If /sys/kernel/debug/gpio is assessable, Will print the content of it , else will print the object properties

  fan.debug()

• Set output, Set the output of the pin either GPIO.HIGH or GPIO.LOW

fan.setOutput(GPIO.HIGH)

• Cleanup after all, Will unexport the pin from sysfs

fan.cleanup()

Warning

This is in very early stage of development , and not intended to be used in any serious work :)