嵌入式Linux下高精度定时器的实现

When developing application using the embedded Linux, it is integrant that implementing some timer with high precision. As the improvement of embed, embedded Linux is used more wildly. The precision of timers is more and more needed. This thesis gives three methods to implement high precision timer, such as using system call, using RTC, using counter and comparing periodically, analyzes the precision of three methods , factors effects the precision, and attentions of using the timer. Finally gives the appliance environment of the three methods.