描述
为了及时响应外部的数据读取请求,4510B的软件中采用中断处理方式读取FPGA中的A/D数据缓存。为了保障连续的采集和传输,对于这部分数据缓存采用“乒乓法”。待当前缓存区存满时,从中断处理程序中释放一个二进制信号量给上传任务,由上传任务负责TCP数据封装,并且数据存储的指针切换到另一块缓存区。VxWoks使用与BSD4.4 Socket兼容的TCP/IP网络协议栈。目此,基于BSD4.4 UNIX Socket的网络应用程序可以很方便的移植到VxWorks中来。对于VxWorks下的TCP/IP编程方法[3]这里不再详述。
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