嵌入式Linux设备操作特殊性研究和实现

嵌入式Linux的应用环境与台式机中的应用环境有很大的不同.这主要是由外设的多样性和对鲁棒性的需求不同造成的.从这些不同点出发,可以得出结论,在嵌入式Linux中,用户进程直接操作外设是更合理和简便的方式.而这种操作涉及到在用户进程中进行外设地址读写与中断处理.它们必须使用间接的和有技巧性的方法来实现.尤其是中断,要处理好响应时间与嵌套等问题.

Particularity Analysis and Implement for Device Manipulating in the Embedded Linux System

The application environment of embedded Linux system is very different with that of Mini or PC based computer system.The diversity character of peripheral device and dissimilar robust performance requirement in the embedded Linux system are required. An indirect and more efficient control strategy such as interrupt time interval and nesting, the key in interrupts handling, are needed. According to our practice, it is a reasonable and efficient way to access peripheral device and handle interrupts by Linux user process directly. More detail analysis and functions discussed in this paper.