介绍了在$ 开发环境下，对34& 设备进行底层访问的两种方法：一是通过调用用户自己编写的动态连接库（,66 ）实现，二是利用)&*,?&$@? 提供的$ 运行库编写直接访问硬件的接口函数，并对两种方法进行了比较。-$　Describes the development environment, the 34 &　low-level device access in two ways: First, by calling the user-written dynamic link libraries (66) implementation, the second is to provide the use of )& *,?& $@? $　runtime library to prepare for direct access to the hardware interface functions, and two methods were compared.