通用串行总线(USB)是一种新兴的计算机外围串行通信接口标准，与常用的计算机接口(如串口、并口等)相比，通用串行总线(Universal Serial Bus，USB)具有热插拔、即插即用、数据传输可靠、扩展方便、低成本等优点。从问世以来，它得到了广泛的应用，一方面已成为当前计算机必备的接口之一，同时也被广泛地应用于嵌入式系统设计中。 从1994年USB 0．7出现开始，USB实施者论坛(Implementation Forum)先后定义了USB 0．8、0．9、1．0、1．1、2．0以及USB OTG等规范，以及各种不同的设备类规范。其中USB1．1规范目前正逐步广泛应用，而USB2．0和USBOTG作为USB协议的更新和扩展，也将使USB占领更广的外设
上传时间： 2016-02-17
上传用户：王小奇
μC/OS-II Goals Probably the most important goal of μC/OS-II was to make it backward compatible with μC/OS (at least from an application’s standpoint). A μC/OS port might need to be modified to work with μC/OS-II but at least, the application code should require only minor changes (if any). Also, because μC/OS-II is based on the same core as μC/OS, it is just as reliable. I added conditional compilation to allow you to further reduce the amount of RAM (i.e. data space) needed by μC/OS-II. This is especially useful when you have resource limited products. I also added the feature described in the previous section and cleaned up the code. Where the book is concerned, I wanted to clarify some of the concepts described in the first edition and provide additional explanations about how μC/OS-II works. I had numerous requests about doing a chapter on how to port μC/OS and thus, such a chapter has been included in this book for μC/OS-II.
标签： OS-II compatible important Probably
上传时间： 2013-12-02
上传用户：jkhjkh1982
SDRAM 参考设计:主要包括The following figure shows a high-level block diagram for this reference design followed by a brief description of each sub-section. The design consists of: · PowerPC processor · PLB-OPB bridge · BlockRAM Memory Controller · SDRAM Controller · Two GPIO ports · A UART Port · External SDRAM
标签： high-level following reference diagram
上传时间： 2013-12-15
上传用户：Miyuki
NAME Control_AT24Cxx This collection of routines allows an AT89C2051 microcontroller to read and write the AT24Cxx family of serial CMOS EEPROMS. This version of the code is compatible only with the AT89C2051 due to the location of the data buffer and stack in RAM. The code may be modified to work with the AT89C1051 by relocating or resizing the buffer and stack to fit into the smaller amount of RAM available in the AT89C1051. Note that the minimum size of the buffer is determined by the page size of the AT24Cxx.
标签： microcontroller Control_AT collection routines
上传时间： 2013-12-13
上传用户：asddsd
2001年春季的IDF上Intel正式公布PCI Express，是取代PCI总线的第三代I\O技术，也称为3GIO。该总线的规范由Intel支持的AWG（Arapahoe Working Group）负责制定。2002 年4月17日，AWG正式宣布3GIO 1.0规范草稿制定完毕，并移交PCI-SIG进行审核。开始的时候大家都以为它会被命名为Serial PCI（受到串行ATA的影响），但最后却被正式命名为PCI Express。2006年正式推出Spec2.0（2.0规范）
上传时间： 2013-12-19
上传用户：hgy9473
EverMore company to a GM-X205GPS accept modules as an example, its data formats, as well as application PIC16F874 microcontroller RS232 serial data receiver procedures.
标签： EverMore as applicat company
上传时间： 2016-03-10
上传用户：tuilp1a
工具：Dynamips, VPCS 结点： R1: 10.0.0.0/8, 90.0.0.0/8 R2: 20.0.0.0/8, 90.0.0.0/8 R3: 30.0.0.0/8, 90.0.0.0/8 H1: 10.0.0.2 H2: 20.0.0.2 H3: 30.0.0.2 要求： R1,R2,R3之间直接用串口(serial) 相连,采用X.25封装。 分配给串口的X.25地址不作限制。 目的：使得H1,H2,H3可以在IP层互通
上传时间： 2016-03-10
上传用户：杜莹12345
CBUF.LIB OVERVIEW: The circular buffers here are standard rotating FIFO buffers. THey are currently used by the RS232 serial library to store incoming and outgoing data, but they are general purpose.
标签： buffers are OVERVIEW circular
上传时间： 2014-01-10
上传用户：vodssv
This example demonstrates how the C8051F06x SMBus interface can communicate // with a 256 byte I2C Serial EEPROM (Microchip 24LC02B). // - Interrupt-driven SMBus implementation // - Only master states defined (no slave or arbitration) // - Timer4 used by SMBus for SCL low timeout detection // - SCL frequency defined by <SMB_FREQUENCY> constant
标签： demonstrates communicate C8051F06x interface
上传时间： 2016-04-12
上传用户：hanli8870
练习并掌握多任务实时操作系统下Task 调度、Task 间主要通信手段（信号量、消息队列等）、RISC 处理器 I/O 端口控制等内容，并形成嵌入式实时应用软件的良好编程习惯。创建多Task，为每个Task 创建私有的Message Queue，每个Task 只通过自己的私有Message Queue 接收消息；Task 间消息通信通过向对方私有MessageQueue 发送消息完成。 Task1：管理Task。负责系统启动时同步系统中其他Task 的启动同步，利用信号量的semFlush()完成。同时接收各Task 的告警信息，告警信息需编号以logmsg 方式输出。本task 负责系统结束时的Task 删除处理。 Task2：console 命令行接收Task。接收并分析console 发来的命令行及参数。自行设置5 种以上命令，并根据命令的内容向Task3 或/及Task4 发送激励消息。同时实现系统退出命令，使系统采用适当方式安全退出。收到非法命令向Task1告警。 Task3：Led 控制Task。接收Led 控制消息（命令），自定义Led 显示方式表现命令执行情况。本task 应负责led 相关I/O port 初始化。收到非法led 控制命令向Task1 告警。 Task4：console 输出Task。接收需打印输出的字串消息（命令），输出到console。收到长度为0 或超常字串向Task1 告警。
上传时间： 2016-04-12
上传用户：iswlkje
