Linux Quick-Action IO port

The operation of Gpio in an embedded device is the most basic operation. The general practice is to write a separate driver, and most of the examples on the web are like this. In fact, there is a generic Gpio operating interface under Linux, that is, I want to introduce the "/sys/class/gpio" way.

First, see if there is a "/sys/class/gpio" folder in the system. If not, please add Device drivers-> GPIO support->/sys/class/gpio/When compiling the kernel ... (Sysfs interface).

The test is as follows:

1, obtain the GPIO information, and in the terminal, typed the following command:

[[email protected" GPIO]#  CD/ sys/ class /gpio




If you want to operate GPIOD19, first you know that your chip discipline is 0-31 sort. So GPIOD0 is 3*32=96,gpiod19=96+19=115

2, enter the following command

[[email protected] gpio]# echo > Export  





Now we have the IO we want to manipulate




3, test

If we want to use this discipline to control the LEDs, then we need to set it to output




is set to high or low level.




Or

View the pin level




Operation Successful!

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Linux Quick-Action IO port