基于FreeRTOS和LwIP的SNTP设计  

Design of SNTP Based on FreeRTOS and LwIP

作　　者：李少杰[1] 马晓辉[1] 

机构地区：[1]上海交通大学自动化系,上海200240

出　　处：《单片机与嵌入式系统应用》2013年第10期29-31,共3页Microcontrollers & Embedded Systems

摘　　要：阐述了基于TI公司Cortex-M3内核的LM9D96和Maxim公司DS1302的实时时钟硬件平台,在轻量级开源FreeRTOS实时操作系统和以太网协议栈LwIP下的SNTP网络对时设计方案。通过SNTP功能可将系统的实时时钟RTC与网络时钟进行同步,确保系统时间一直保持较高的精度。LM9D96片内集成以太网控制器,FreeRTOS和LwIP均为开源,对于成本敏感而又需要高精度的时钟应用场合,具有较高的研究及应用价值。This paper proposed a design of SNTP using lightweight FreeRTOS embedded real-time operating systew and LwIP stack based on TI＇s Cortex-M3 core LM9D96 and Maxim DS1302 real-time clock hardware platform. The system real-time clock is synchronized by Internet time server to maintain high accuracy through SNTP protocol. The 10/100 Ethernet MAC and PHY controller is integrated in LM9D96 microprocessor, and the FreeRTOS and the LwIP stack are open source, for cost-sensitive applications requiring highprecision clock, this design has high research and application value.

关 键 词：FREERTOS Cortex—M3 LM9D96 DS1302 SNTP LWIP 网络对时 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]