在线笔记
全部博文(596)
发布时间:2013-08-10 13:54:23
http://blog.cechina.cn/yrg/36799/message.aspx一、串口简介 RS-232、RS-422与RS-485都是串行数据接口标准,最初都是由电子工业协会(EIA)制订并发布的,RS-232在1962年发布,命名为EIA-232-E,作为工业标准,以保证不同厂家产品之间的兼容。RS-422由RS-232发展而来,它是为弥补RS-232之不足而提出的。为改进RS-232.........【阅读全文】
发布时间:2013-08-09 12:31:54
http://stackoverflow.com/questions/12392278/measure-time-in-linux-getrusage-vs-clock-gettime-vs-clock-vs-gettimeofdayThe problem is that there are several different time functions available in C and C++, and some of them vary in behavior between implementations. There are also a lot of half-answe.........【阅读全文】
发布时间:2013-08-06 21:21:18
结构体typedef struct _room{ int id; char name[32]; int *p; int phone;}room;room g_room = { 1, "room", NULL, 123};.........【阅读全文】