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USB流程

  • USB Demonstration for DK3200 w

    The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 MicrocontrollerCore. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementationof the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision1.1.This application note describes a demonstration program that has been written for the DK3200 hardwaredemonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to workwith the device, using the HID class as a ready-made device driver for the USB connection.IN-APPLICATION-PROGRAMMING (IAP) AND IN-SYSTEM-PROGRAMMING (ISP)Since the μPSD contains two independent Flash memory arrays, the Micro Controller Unit (MCU) can executecode from one memory while erasing and programming the other. Product firmware updates in thefield can be reliably performed over any communication channel (such as CAN, Ethernet, UART, J1850)using this unique architecture. For In-Application-Programming (IAP), all code is updated through theMCU. The main advantage for the user is that the firmware can be updated remotely. The target applicationruns and takes care on its own program code and data memory.IAP is not the only method to program the firmware in μPSD devices. They can also be programmed usingIn-System-Programming (ISP). A IEEE1149.1-compliant JTAG interface is included on the μPSD. Withthis, the entire device can be rapidly programmed while soldered to the circuit board (Main Flash memory,Secondary Boot Flash memory, the PLD, and all configuration areas). This requires no MCU participation.The MCU is completely bypassed. So, the μPSD can be programmed or reprogrammed any time, anywhere, even when completely uncommitted.Both methods take place with the device in its normal hardware environment, soldered to a printed circuitboard. The IAP method cannot be used without previous use of ISP, because IAP utilizes a small amountof resident code to receive the service commands, and to perform the desired operations.

    标签: Demonstration 3200 USB for

    上传时间: 2014-02-27

    上传用户:zhangzhenyu

  • 对带有uPSD3234A的DK3200的USB演示

    The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 Microcontroller Core. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementation of the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision 1.1.This application note describes a demonstration program that has been written for the DK3200 hardware demonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to work with the device, using the HID class as a ready-made device driver for the USB connection.

    标签: 3234A uPSD 3234 3200

    上传时间: 2014-04-03

    上传用户:lizhizheng88

  • CAN总线与USB的转接技术

    简要介绍了CAN总线技术与USB总线技术的特点,给出了通过将两特点相结合,并选用微控制器AT89C52尧USB控制芯片CH372和独立CAN控制芯片SJA1000实现USB-CAN数据传输系统的设计方案遥该系统不但能实现CAN总线与USB总线之间的数据转化,并可在两台主机配合下完成两个节点之间数据的透明传输。关键词 通用串行总线USB CAN总线 数据通信

    标签: CAN USB 总线 转接技术

    上传时间: 2013-10-15

    上传用户:plsee

  • 内置微处理器的USB音频接口芯片TUSB3200

    摘要:TUSB3200 是由德州仪器日本公司推出的一款用于USB 接口连接的音频数据控制芯片,该芯片内置8052MCU 微处理器,能实现多声道的录音和播放功能。文中介绍了TUSB3200 的内部工作原理、框图及功能,并给出了用TUSB3200 设计的双声道输入/输出播录的应用电路。关键词:USB 音频接口 单片机 TUBS3200 USB 音频接口电路是带USB 接口的音响设备和电脑多媒体外围设备的必需器件。德州仪器公司推出的TUSB3200 是一款最适合于音响和电脑周边设备的USB 接口用的音频数据控制芯片。它采用52 脚扁平封装,带有内置微处理器,价格低,可实现多声道播放和录音等功能,因而具有广泛的用途。

    标签: TUSB 3200 USB 内置

    上传时间: 2013-11-23

    上传用户:dumplin9

  • USB/EPP转接系统的硬件设计与分析

    摘要:设计并实现了一个USB/EPP 转接系统,给出其硬件设计方案并讨论了相关技术细节, 使其实现USB 接口到EPP接口的相互数据转发。使仅具有EPP 接口的传统仪器设备借助于USB/EPP 转接系统拥有USB 总线所提供的即插即用和设备插架特性, 方便其通过USB 接口灵活接入同时拥有多个外设的计算机主机系统。关键词:USB;EPP;转接系统中图分类号:TP368.3 文献标识码:A文章编号:1008- 0570(2005)11- 2- 0166- 03 在传统的I/O 模式中,计算机外设通常映射为CPU 中固定I/O 地址,要求由主机分配一个指定的IRQ 中断请求。由于PC 机的端口和中断资源有限,因而使外设的可扩展性受到局限;同时,随着电脑应用的拓展,PC 机的外设接口越来越多,外设对系统资源的独占性也容易导致系统资源冲突。由于各种外部设备不断增加,容易导致各种I/O 冲突。由Intel、Compaq、Microsoft、IBM等厂商所提出的USB 总线标准,基于即插即用和设备插架技术,设备接入时不影响应用程序的运行,具有良好的可扩充性和扩展的方便性。目前USB 协议已经发展到了最新的2.0 版本,可支持峰值传输速率为480Mbps 的高速外设,可提供4~8 个USB 2.0 接口,同时通过USB 集线器(HUB)的扩展还可以支持多达127 个外设同时连接,基本上解决了各种外设同时存在同时使用的所有问题。基于USB 接口的上述优点,目前的计算机,特别是笔记本计算机基本上都只配备USB 接口,而取消了传统的串口和并口,这对那些以前购置的需要与计算机进行通信而只有串口或并口的各种仪器的继续使用造成了极大的障碍。 针对传统的数字化仪器与计算机通信中存在的接口不足的问题,本文设计了一个USB/EPP 转接系统,使其能够从计算机的USB 接口接收数据,经过格式转换,从USB/EPP 转接系统的并行接口EPP 发送给传统的仪器设备;同时也能够从USB/EPP 转接系统的并行接口EPP 接收数据,将其转化为USB 帧格式,并发送到计算机的USB 接口。从而使仅具有EPP 接口的传统仪器设备借助于USB/EPP 转接系统,可以继续正常使用。2 USB 总线2.1 USB 系统描述及总线协议USB 是一种电缆总线,支持在主机和各种即插即用外设之间进行数据传输。由主机预定的标准协议使各种设备分享USB 带宽,当其它设备和主机在运行时,总线允许添加、设置、使用以及拆除外设,这为多个仪器设备共享同一个主计算机提供了可能。USB 协议采用了管道模型的软硬件协议,摒弃了一般外设协议的端口映射方式,从而有效地避免了计算机应用系统I/O 端口地址冲突。根据功能划分,一个USB 系统由三个部分组成:即USB 互连、USB 主机和USB 设备。图1 给出了USB系统的通用拓扑结构。

    标签: USB EPP 转接

    上传时间: 2013-10-09

    上传用户:半熟1994

  • 基于USB接口的数据采集模块的设计与实现

    基于USB接口的数据采集模块的设计与实现Design and Implementation of USB-Based Data Acquisition Module路 永 伸(天津科技大学电子信息与自动化学院,天津300222)摘要文中给出基于USB接口的数据采集模块的设计与实现。硬件设计采用以Adpc831与PDIUSBDI2为主的器件进行硬件设计,采用Windriver开发USB驱动,并用Visual C十十6.0对主机软件中硬件接口操作部分进行动态链接库封装。关键词USB 数据采集Adpc831 PDNSBDI2 Windriver动态链接库Abstract T hed esigna ndim plementaitono fU SB-BasedD ataA cquisiitonM oduleis g iven.Th ec hips oluitonm ainlyw ithA dpc831a ndP DTUSBD12i sused for hardware design. The USB drive is developed场Wmdriver, and the operation on the hardware interface is packaged into Dynamic Link Libraries场Visual C++6.0.  Keywords USB DataA cquisition Adttc831 PDfUSBD12 Windriver0 引言US B总 线 是新一代接口总线,最初推出的目的是为了统一取代PC机的各类外设接口,迄今经历了1.0,1.1与2.0版本3个标准。在国内基于USB总线的相关设计与开发也得到了快速的发展,很多设计者从各自的应用领域,用不同方案设计出了相应的装置[1,2]。数据采集是工业控制中一个普遍而重要的环节,因此开发基于USB接口的数据采集模块具有很强的现实应用意义。虽然 US B总线标准已经发展到2.0版本,但由于工业控制现场干扰信号的情况比较复杂,高速数据传输的可靠性不容易被保证,并且很多场合对数据采集的实时性要求并不高,开发2.0标准产品的成本又较1.1标准产品高,所以笔者认为,在工业控制领域,目前开发基于USB总线1.1标准实现的数据采集模块的实用意义大于相应2.0标准模块。

    标签: USB 接口 数据采集模块

    上传时间: 2013-10-23

    上传用户:q3290766

  • PL2303 USB to Serial Adapter

    The PL2303 USB to Serial adapter is your smart and convenient accessory forconnecting RS-232 serial devices to your USB-equipped Windows host computer. Itprovides a bridge connection with a standard DB 9-pin male serial port connector inone end and a standard Type-A USB plug connector on the other end. You simplyattach the serial device onto the serial port of the cable and plug the USB connectorinto your PC USB port. It allows a simple and easy way of adding serial connectionsto your PC without having to go thru inserting a serial card and traditional portconfiguration.This USB to Serial adapter is ideal for connecting modems, cellular phones, PDAs,digital cameras, card readers and other serial devices to your computer. It providesserial connections up to 1Mbps of data transfer rate. And since USB does not requireany IRQ resource, more devices can be attached to the system without the previoushassles of device and resource conflicts.Finally, the PL-2303 USB to Serial adapter is a fully USB Specification compliantdevice and therefore supports advanced power management such as suspend andresume operations as well as remote wakeup. The PL-2303 USB Serial cable adapteris designed to work on all Windows operating systems.

    标签: Adapter Serial 2303 USB

    上传时间: 2013-11-01

    上传用户:ghostparker

  • USB鼠标设计资料 (含原理图和源程序)

    USB鼠标设计资料含有原理图,芯片资料,和源程序代码。

    标签: USB 鼠标 设计资料 原理图

    上传时间: 2013-10-13

    上传用户:3294322651

  • 旺玖USB转串口控制芯片PL-2313资料

    旺玖USB转串口控制芯片PL-2313资料

    标签: 2313 USB PL 转串口

    上传时间: 2014-01-25

    上传用户:zhuimenghuadie

  • USB系统体系

    USB系统体系

    标签: USB

    上传时间: 2013-11-05

    上传用户:ynzfm