基于ARM7的嵌入式系统中频率数据获取与共享

嵌入式控制系统在执行复杂测量与控制任务的同时,常需要测量外部信号的频率。为了保证处理器能够及时完成其他任务,又不影响频率的测量,该文提出了一种使用CPLD测量频率,通过总线读写方式与处理器上的专用进程交换数据的办法,并讨论了其它进程共享频率数据的方法。

Frequency Data Acquisition and Share in an Embedded System Based on ARM7

Frequency of external signals is constantly needed to be measured when complex measurement and control instructions are executed in an embedded system. To make sure that other tasks can be finished in time instead of resulting in the failure of the measuring, a way, frequency measured by CPLD and bus used to communicate between the CPLD and ARM, is brought forward in this article. Additionally, the method of acquiring frequency data shared by other processes in the system is discussed.