Skip to content

Permit you to find the GPIO file associated to a given pin-name like P9_14

Notifications You must be signed in to change notification settings

nmingotti/pinNameToGPIO

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

13 Commits
 
 
 
 

Repository files navigation

pinNameToGPIO

BeagleBoard. Find the GPIO file associated to a given pin-name, like P9_14

Mini documentation

Problem description

It often happens that we want to use a pin as a digital input/output pin, that is a gpio. To do so first you need to say to the beagleboard the pin is a GPIO. You can do it do using config-pin then, you need to know which file in the filesystem has been associated to the GPIO, that is, you need to establish the XXX value in /sys/class/gpio/gpioXXX. There is a formula to do that, but its is different between the BB-Black and the BB-AI also, it does not always work: e.g. in BB-AI for P9_11 to me it fails. Therefore I give us this script which should solve the problem once and for all.

Example

  • We know pin P9_14 is set to gpio, what is its associated file in sysfs ?
  • You run:
$> pinNameToGPIO.py P9_14
  • In my system I get as output /sys/class/gpio/gpio121, your output may be different.
  • If you get no output it means the associated file was not found i.e. the system thinks the pin you selected isn't a GPIO pin.
  • You can write the pin name as P9_14 or P9.14 and it is case insensitive.

Tested working in

  • 02-dec-2021. BB-AI, BeagleBoard.org Debian Buster IoT Image 2021-10-01, Linux BB-AI-1 4.19.94-ti-r68 #1buster
  • 03-dec-2021. BB-Black, BeagleBoard.org Debian Buster IoT Image 2020-04-06, Linux beaglebone 4.19.94-ti-r42

ATTENTION !!

  • The BeagleBoard world moves fast, always check:
    • Your board name
    • Your operating system version

Changelog

  • 03-dec-2021 - tested in BB-Black
  • 02-dec-2021 - improving the Readme

About

Permit you to find the GPIO file associated to a given pin-name like P9_14

Resources

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published

Languages