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高速USB是一种具有即插即用、热插拔特点的计算机总线技术,其传输速率高而且应用广泛.但基于USB的协议模块开发比较困难,本文给出基于STM32CubeMX的高速USB通信模块设计.该方案以外扩高速USB3300芯片的STM32F4x为硬件平台,利用STM32CubeMX快速生成USB库函数和LabVIEW图形化软件编程工具,共同实现高速USB通信的高效开发.实验结果表明,该设计传输速率可达3.0 Mbps以上,且开发快捷. 相似文献
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通过分析明细栏的结构特征,以明细栏表头为参考单位,自动判断明细栏位置,在此基础上,用矩阵表示明细栏,提出了一种基于矩阵存储的、自动提取任意工程图纸中明细栏的方法,实现了明细栏信息的自动提取和入库. 相似文献
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Equalization can compensate channel distortion caused by channel multipath effects, and effectively improve convergent of modulation constellation diagram in optical wireless system. In this paper, the subspace blind equalization algorithm is used to preprocess M-ary phase shift keying (MPSK) subcarrier modulation signal in receiver. Mountain clustering is adopted to get the clustering centers of MPSK modulation constellation diagram, and the modulation order is automatically identified through the k-nearest neighbor (KNN) classifier. The experiment has been done under four different weather conditions. Experimental results show that the convergent of constellation diagram is improved effectively after using the subspace blind equalization algorithm, which means that the accuracy of modulation recognition is increased. The correct recognition rate of 16PSK can be up to 85% in any kind of weather condition which is mentioned in paper. Meanwhile, the correct recognition rate is the highest in cloudy and the lowest in heavy rain condition. This work has been supported by the National Natural Science Foundation of China (No.61671375), and the Industrial Research of Science and Technology Plan of Shaanxi Province (No.2016GY-082). E-mail:chdh@xaut.edu.cn 相似文献
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CH395是一款集成TCP/IP协议栈的国产以太网控制器芯片,为给普通单片机扩展基于CH395的以太网通信功能,提供实测数据传输速率参考。以单片机C8051F340外扩CH395为例,给出了一种简单易行的CH395网络通信速率测试方案。该方案在硬件上选用C8051F340片上外设中占用硬件资源较少且速率较快的SPI接口与CH395互连实现网络数据交互。在软件上单片机C8051F340直接通过命令调用CH395自带的库函数并采用CH395内置的TCP/IP协议栈把单片机配置成服务器,用LabVIEW上位机做的客户端与其进行数据通信。通过一种测试方案两种测试方法并经过多次数据通信实验,在SPI单收和单发模式下不丢失数据的情况下网络通信平均速率可以稳定达到200 KB/s。 相似文献
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