Schindler 4412 Board Linux Driver Tutorial--Write a simple application call driver

Linux Driver Tutorials : Http://pan.baidu.com/s/1c0hljUS

Write a simple application call driver--header file

? Print header File

–include <stdio.h> calling print function printf

? The header file needed to invoke the file in the app

– #include <sys/types.h> basic system data types. The basic data type of the system is compiled in 32

The environment is maintained as a 32-bit value and grows to a 64-bit value in the 64 compilation environment.

– #include <sys/stat.h> system Call function header file. Can call ordinary files, directories, tubes

Tao, socket, character, block properties

– #include <fcntl.h> defines the Open function

– #include <unistd.h> defines the close function

– #include <sys/ioctl.h> defines the IOCTL function

? The header file that was called is the one that was put together with the compiler.

– Using the ARM2009Q3 compiler here, the compiler uses the ARM-NONE-LINUX-GNUEABI-GCC

? Locate the header file by using the Find command in the compiler directory

– e.g. #find./-name Types.h

? Functions that are called

The –open function is a return file descriptor

The –IOCTL function is applied to the drive to pass the value

The –close function is to close open files

? Write code for the application, compile

–arm-none-linux-gnueabi-gcc-o Invoke_hello invoke_hello.c-static

? Load Devicenode_linux_module Drive in the development Board, run the application

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Schindler 4412 Board Linux Driver Tutorial--Write a simple application call driver