大容量多通道数据采集系统中的USB接口设计

Design of USB interface under large-capacity and multi-channel data acquisition

随着外围设备的多样化与大容量数据传输的需求,USB接口的应用范围越来越广。本文主要介绍了USB接口芯片FT245R和在大容量多通道数据采集系统中FT245R芯片与FPGA接口电路的软硬件设计,给出了在虚拟串行口驱动程序和动态链接库两种驱动程序下的PC端软件设计思路,在VC6.0软件下通过调用动态链接库实现了PC端的软件设计。该电路被成功地应用到大容量多通道数据采集系统中,简化了电路设计,提高了测试效率,具有很强的通用性。

With the diversification of peripheral equipment and the needs of large-capacity data transmission,the range of applications for USB interface becomes increasingly widespresd.The paper initially focuses on the introduce of FT245R chip of USB as well as the design between software and hardware for FT245R chip and FPGA interface circuit based on large-capacity and multi-channel of Data Acquisition System.Then the paper seeks out design plans for software of PC interface under two device drivers between virtual serial port and dynamic link library. Eventually the paper brings about the design for software PC interface by means of calling dynamic link library found on VC6.0 software. This circuit is applied to large-capacity and multi-channel of Data Acquisition System successfully. Circuit of the system is simplified and test efficient is improved too. This design is common in many use.