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来自「The source code example of ARM9 developm」· 代码 · 共 22 行

MATRIX example program
gpio.c

1.Compiler and build
execute "make" will create executable file.

2.Download to MATRIX
use ftp or USB/SD to put the executable file into MATRIX.

3.Execute example
first change file access permissions:
chmod +x gpio.o
and then execute:
./gpio.o

4. Example Description: 
example for GPIO.
What is shown in this example:
	1. How to open gpio
	2. How to get count of GPIO and DIP_SW
	3. How to get status of GPIO and DIP_SW