Linux gpio debug log (am335x)

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Two tools are available for Linux to debug gpio.

Dubugfs

The other is the gpio driver framework of Linux.

First, debugfs's usage for gpio debugging

1. debugfs on Mount

 
Mount-T debugfs/sys/kernel/debug
 

2. Find the Pin Multi-path configuration option

My path is ../debug/omap_mux

You can view all the configurations of the current gpio.

Another method is to debug in the driver framework provided by the Linux kernel.

1. Find the file interface path provided by the driver to the application

/Sys/class/gpio

The usage of each file in gpio is as follows:

 
$ Echo 30>/sys/class/gpio/Export
 

Change the gpio pin direction to in/out

 
$ Echo "out">/sys/class/gpio/gpio30/Direction
 

Or

 
$ Echo "in">/sys/class/gpio/gpio30/Direction
 

Change the value

 
$ Echo 1>/sys/class/gpio/gpio30/value
 

Or

 
$ Echo 0>/sys/class/gpio/gpio30/value
 

Unexport the gpio pin

 
$ Echo 30>/sys/class/gpio/unexport