利用USB接口实现数据采集

Realization of Data Acquisition System Using USB Interface

研究了USB接口的数据采集系统的设计与实现。整个系统以EZ-USB控制器为核心,由EZ-USB经控制电路实现对模数转换的控制。数据缓冲器存满后,通知EZ-USB控制器,由主机取出采样数据,并实时显示波形。系统硬件主要采用以AN2131QC为核心的USB接口电路和以模数转换器AD1674为核心的USB设备功能单元电路,系统软件采用Ke il C51语言编写芯片固件程序、采用VC++语言编写USB设备驱动程序和W in32应用程序。实验表明,该系统用于音频等信号的数据采集,性能稳定,效果良好。

Data acquisition system is designed and realized by USB Interface. At the core of the system is an EZ-USB controller and A/D transform is controlled by its control circuit. EZ-USB controller gets a message when the data buffer is full, then the acquired data is taken by the host computer and its waveform is thus shown in the windows in real time. At the core of USB interface circuit is AN2131QC and at the core of USB functioning circuit unit is AD1674. The firmware of the system is written by Keil C51 language and the USB driver and Win32 application by VC ＋ ＋. Experiments show that the system has stable performance and good effect when it is used in data acquisition of audio signals and so on.