此程序为在Linux操作系统中通过I2C总线驱动，来读取罗盘传感器LSM303（此传感器内含1个加速度计和一个磁场计）的加速度传感器的测量值。这个一个user space程序。-This procedure for the Linux operating system through the I2C bus driver to read the compass sensor LSM303 (This sensor includes an accelerometer and a magnetome