基于CORTEX-M3的IEEE 1588协议的实现

Realization of IEEE 1588 Protocol Based on Cortex-M3

随着基于以太网技术在分布式系统的广泛应用,分布式系统时钟同步问题迫切的需要解决。文章提出了基于Cortex-M3的微控制器LM3S8962的IEEE 1588时钟同步协议的实现方案,介绍了LM3S8962芯片硬件时间戳的生成和IEEE 1588从时钟的实现,并分析了影响时钟同步精度的因素。并最终利用LM3S8962硬件平台,实现了IEEE 1588协议。测试结果表明,利用M3芯片内部对IEEE 1588协议硬件支持的功能,可以达到系统高精度的时间同步要求。

With the wide application of the distributed system based on Ethernet technology, the problem about clock synchronization of distributed system needs to be solved. This paper presents a scheme about IEEE 1588 clock synchro- nization protocol of micro controller LM3S8962 based on Cortex-M3. It introduces the production of the LM3S8962 hard- ware timestamp and the realization of IEEE 1588 slave clock. The factors which affect the accuracy of clock synchro- nization have been analyzed. Finally, using the LM3S8962 hardware platform, IEEE 1588 protocol is realized. The testing result shows that the function of Cortex-M3 internal hardware supports IEEE1588, and the high precision request of time synchronization has been achieved.