基于USB接口的等效器的设计与实现

Design and Achievement of the Equivalent Device Based on USB Interface

为配合测量系统对飞行设备进行试飞前各种性能参数的检测,提出了一种基于USB接口的等效器的设计与实现。该等效器是地面模拟设备,用于等效飞行器控制系统与测量系统的接口,产生适合测试的各种模拟与数字信号。系统与上位机的通信采用USB协议芯片FT245RL实现接口设计,同时通过FPGA控制、VHDL的灵活使用及超强的硬件设计,实现各模拟信号与RS422异步串行数字量的高可靠性传输功能。

[ Abstract] To achieve the detection for all kinds of performance parameters of astrovehicle before take-off, a way of design and achievement of the equivalent devices based on USB interface is put forward. The device is a ground simulate equipment that can be used to equivalent to interface of astrovehicle control system and measure- ment system, and it will produce all kinds of apposite analog and digital signals which is needed in test. The com- munication between this device and the host computer used FIY245RL interface which is an USB protocol chip. By mean of the control of FPGA and the flexible using of VHDL and the powerful hardware design, it can achieve relia- ble transmission of analog signals and RS422 asynchronous serial digital signals.