使用i2c-dev 从smbus读取wii游戏手柄nunchunk数据，根据读取的x-position , y-position位置，画轨迹，改变颜色，刷新屏幕-Using i2c_dev.h to read data from nunchunk and draw the trajecty of it.Change color and refresh the screen. Z and C button are pressed to exit the program