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毕业设计

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USB接口信号发生器,毕业设计

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摘 要 本系统介绍 USB 接口波形发生器的设计。 它采用直接数字频率合成（ DDFS）技术，实时将 USB 接收到的数据转换成各种频率的波形输出，所使用的 USB 传输方式为全速同步传输。 它 可以输出正锯齿波、反锯齿波、三角波、方波和正弦波 5 种波形 。 其硬件电路由以 USB 控制芯片 AN2131QC 为核心的 USB 接口单元、以可编程逻辑器件 EPM7064 为核心的 DDFS 单元、以数模转换器 TLC7524 和 DAC0832 为核心的波形输出单元三大部分构成。其中， USB 接口单元负责完成硬件系统和 PC 机之间的数据传输， DDFS 控制单元 负责控制系统输出波型的频率，波形输出单元负责对波形数据进行 DA 转换，并负责控制输出波形幅度峰峰值。它的系统软件包括 Keil C51语言编写的 AN2131QC 芯片固件程序、 Visual C+语言编写的 USB 设备驱动程序和Win32 应用程序。其波形频率范围是 0.5Hz 15999.5Hz,步进值为 0.5Hz，幅度范围是 0V +5V,步进值为 20mV。 关键词 : USB 接口；任意波形； DDFS；波形发生器； Visual C+语言 ntsABSTRACT This system introduces the design of USB interface wave form generator. It uses direct digital frequency synthesizer (DDFS) techniques, real-time will be received USB data into various frequency waveform output, used for full-speed USB transfer mode asynchronous transfer. It can output is sawtooth, anti-aliasing wave, triangle wave, square wave and sine wave . The hardware circuit to USB controller chip by AN2131QC at the core of the USB interface unit to EPM7064 programmable logic device as the core unit DDFS to DAC TLC7524 and the DAC0832 output waveform at the core constitute the majority of unit three. Which, USB interface unit is responsible for the completion of the hardware systems and PC data transfer between machines, DDFS control unit control system is responsible for the frequency of the output waveform, waveform output unit is responsible for the waveform data DA conversion, and is responsible for control of output waveform peak-to-peak amplitude. Its system software, including the Keil C51 language AN2131QC firmware chip, Visual C + + language prepared USB device drivers and Win32 applications. Its frequency adjustment range is 0.5Hz 15999.5Hz, step value of 0.5Hz and amplitude of the adjustment range of 0V +5 V, step value of 20mV. Key wo