摘要
针对在嵌入式系统中,当系统重启或异常断电的情况下,实时时间信息丢失的问题,本文提出了两种获取实时时间的方法:时钟芯片方法和GPS方法。时钟芯片方法中以DS1302为例,介绍了它在嵌入式系统中的软硬件设计。GPS方法中使用GPS接收机接收卫星信号,然后将符合NMEA-0183协议的格式化数据通过串口送往嵌入式系统,再通过软件提取数据中的时间信息。
for the problem of real time missing when system restart or unexpected power down in embedded system, this paper presents two methods to solve it： one is using real-time clock chip; the other is using GPS receiver. In the method of using real-time clock chip, taking DS1302 as an example, article introduces the software and hardware design. In the method of using GPS, the GPS receiver can receive signals of GPS satellite and output format data which is consistent with the NMEA-0183 protocol via serial port, and then we can extract the real time from the format data after some software treatment.
出处
《电子技术（上海）》
2009年第2期63-66,共4页
Electronic Technology
基金
安徽高校省级自然科学研究重点项目(批号:KJ2008A010).
