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In this article, the editor introduces in detail "how to use shell commands to control GPIO input and output in linux system environment" with detailed content, clear steps and proper handling of details. I hope that this article "how to call shell commands to control GPIO input and output in linux system environment" can help you solve your doubts.

As the shell of Linux operating system, shell provides users with the interface to use the operating system. It is a general term for command language, command interpreter, and programming language. It interprets commands entered by users and sends them to the kernel.

Use the shell command to directly operate the gpio node under / sys/, first comment out the LED and keystroke functions of the device tree in imx6ull-14x14-evk.dts, and the LED pin is GPIO0_3,key pin and GPIO1_18 pin.

Read the key value and control the LED lamp through the shell command in the program.

1. Execute shell commands through popen

The function of the popen and pclose functions is to create a pipe to connect to another process, and then read the output of that process or send input to it by fork a child process and exec a shell to execute commands.

two。 Fill in the shell command and set the pin status

3. Control Led

Cross-compile arm-linux-gnueabihf-gcc-o led shellGpio.c and copy the led file to the development board.

The test shows that the lights of the development board are flashing and the terminal has printed messages:

4. Read key valu

Post-compilation testing:

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