嵌入式Linux设备的高精度IEEE 1588时钟同步实现

Implementation of High-precision IEEE 1588 Clock Synchronization Based on Embedded Linux Device

摘要:

IEEE 1588时钟同步协议用于解决分布式网络测控系统中远距离仪器设备之间的同步问题；在分析IEEE 1588时钟同步实现原理的基础上,提出一种嵌入式Linux设备的高精度IEEE 1588时钟同步实现方案；采用专用PHY芯片DP83640在物理层为PTP报文加盖硬件时间戳,设计网络设备驱动与PTP硬件时钟控制驱动,并在用户层利用Linux系统标准API实现IEEE 1588协议软件；实验结果表明,两台设备直接相连时,时钟同步精度可稳定在±100 ns以内。

Abstract:

The IEEE 1588 Precision Time Protocol is used to achieve synchronization among the long-distance instruments in distributed network measurement and control system. On the basis of analysis of the IEEE 1588 clock synchronization principle, a method is proposed to implement high-precision IEEE 1588 clock synchronization based on the embedded Linux device. The dedicated PHY chip DP83640 is used to time stamp the PTP massages in physical layer, the network device driver and the PTP hardware clock control driver is designed, and the IEEE 1588 protocol software is implemented using the Linux system standard API in user space. Experimental results show that the clock synchronization accuracy can be stabilized within ± 100ns when two devices are directly connected.