树莓派gpio

http://www.eeboard.com/bbs/thread-6930-1-1.html

http://www.codelast.com/?p=5232
安装git-core
sudo apt-get install git-core

下载winringPi库
git clone git://git.drogon.net/wiringPi
参考https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/

可能需要 apt-get intstall libi2c-dev
i2c-tools，libi2c-dev ，python-smbus
参考http://blog.csdn.net/liang890319/article/details/8643069
否则报错

/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_write_byte'
/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_read_byte'
/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_write_byte_data'
/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_write_word_data'
/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_read_word_data'
/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../libwiringPi.so: undefined reference to `i2c_smbus_read_byte_data'

编译和安装库
cd wiringPi
./build

写了一段简单的测试代码:
/********** test.c ***************/
#include <wiringPi.h>
#include <stdlib.h>

int main()
{
    int i;

    if( wiringPiSetup() == -1 )
        exit( 1 );

    pinMode( 0, OUTPUT ); 
    pinMode( 1, OUTPUT ); 
    pinMode( 2, OUTPUT ); 
    pinMode( 3, OUTPUT ); 

    for(i = 0; i < 40; i++)
    {
        digitalWrite( i % 4, HIGH );
        delay( 200 );
        digitalWrite( i % 4, LOW );
        delay( 200 );
    }

    return 0;
}
/********** test.c ***************/

编译&执行:
cc -o test test.c -L/usr/local/lib -lwiringPi
sudo ./test

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