针对目前使用的RS232接口数字化B超键盘存在PC主机启动时不能设置BIOS，提出一种PS2键盘的设计方法。基于W78E052D单片机，采用8通道串行A/D转换器设计了8个TGC电位器信息采集电路，电位器位置信息以键盘扫描码序列形式发送，正交编码器信号通过XC9536XL转换为单片机可接收的中断信号，软件接收到中断信息后等效处理成按键。结果表明，在满足开机可设置BIOS同时，又可实现超声特有功能，不需要专门设计驱动程序，接口简单，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
上传时间： 2013-10-10
上传用户：asdfasdfd
VIP专区-嵌入式/单片机编程源码精选合集系列（45）资源包含以下内容：1. 详细的介绍了minigui的原理及其在linux上的实现..2. c8051f04x_cn数据手册中文版c 8051f04x_cn数据手册中文版.3. 汇编时钟程序.4. 这是一个minweb原程序.5. 做液晶显示用的获得汉字字模区位码的软件和一些例城.6. 这是移植到hcs12上的UC/OS－ii程序 欢迎使用.7. 数据采集模拟端口选择.8. 用模拟比较器实现AD模拟转换.9. 用c语言编写的SPI总线在单片机中的应用源代码.10. 用c语言编写的计算器的源代码.11. 单片机液晶显示器点阵的实现.12. 键盘扫描输入.13. ATmega128L单片机 数据手册 ATmega128L微控制器.14. S3C44B0X全套培训资料及源代码 e008s3c44b0x.15. FreeRTOS ver3.4.2 免费Real Time OS..16. 转载别人的作为下载源.17. 程序为步进电机程序.18. 此程序为红绿灯程序.19. ad采集程序.20. cvavrc编译器函数库介绍,对各函数介绍比较全。.21. 这里是对80c196的一个概述.22. 这是Chipcon公司推出的最新板Zigbee开发软件平台RFSmart_Studio6.20。CC2430.23. 一个很好用的12864液晶显示屏的驱动源程序.24. 有关ARM的详细的参考资料.25. 该程序是周立功公司开发的在lpc系列ARM的基础上开发SD卡的相关程序以及对应pc机程序.26. Easy JTAG Driver.27. gdb使用详解.doc 嵌入式开发努力学习中！.28. PCI9054应用程序（VC）是用VC开发的对应的应用程序.29. ucos2 内核的详尽代码.30. 基于s3c44b0的测试程序.31. 基于nios软核处理器的FPGA嵌入式片上系统中的mp3算法.32. 日本很有名的一个嵌入式RTOS.33. 一个小的操作系统包括应用程序很有参考价值.34. 一个开放源代码的AVR单片机编程器.35. QF量子框架源码.36. LU矩阵分解单机版最新版本.37. 随机长生一些温度直.38. 嵌入式程序.39. vxworks嵌入式程序.40. C语言开发用开Z80芯片的汇编语言... 软件类别：其他程序 运行环境：Win9x/NT/2000/XP.
上传时间： 2013-04-15
上传用户：eeworm
应用德国Micronas公司的CDC3207G微控制器开发了一款汽车仪表板系统。详细地介绍了该系统的硬件原理，以及步进电机，音频控制，LCD显示，LED指示灯和报警灯等几个模块的实现方法。应用μC/OS-II实时操作系统开发软件。着重介绍了启动代码的设计和任务的规划。 Abstract: A dashboard system is developed by using CDC3207G microcontroller made by Micronas.The hardware of the sys-tem and the realization of the step motor module,audio module,LCD display and LED indicator and alarm module are ex-plained in detail.The μC/OS-II real-time operating system is used for the software development and the starting code design and the task planning is explained specifically.
上传时间： 2013-10-26
上传用户：x4587
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
上传时间： 2014-12-30
上传用户：aysyzxzm
acm HDOJ 1051WoodenSticks Description: There is a pile of n wooden sticks. The length and weight of each stick are known in advance. The sticks are to be processed by a woodworking machine in one by one fashion. It needs some time, called setup time, for the machine to prepare processing a stick. The setup times are associated with cleaning operations and changing tools and shapes in the machine. The setup times of the woodworking machine are given as follows: (a) The setup time for the first wooden stick is 1 minute. (b) Right after processing a stick of length l and weight w , the machine will need no setup time for a stick of length l and weight w if l<=l and w<=w . Otherwise, it will need 1 minute for setup.
标签： WoodenSticks Description length wooden
上传时间： 2014-03-08
上传用户：netwolf
This book is intended for embedded system programmers, consultants and students interested in real-time operating systems. μC/OS-II is a high performance, deterministic real-time kernel and can be embedded in commercial products (see Appendix F, Licensing). Instead of writing your own kernel, you should consider μC/OS-II. You will find, as I did, that writing a kernel is not as easy as it first looks.
标签： consultants programmers interested intended
上传时间： 2015-11-06
上传用户：l254587896
water temperature control system uses the Single Chip Microcomputer to carry on temperature real-time gathering and controling. DS18B20, digitized temperature sensor, provides the temperature signal by "a main line". In -10～+85℃ the scope, DS18B20’s inherent measuring accuracy is 0.5 ℃. The water temperature real-time control system uses the electricity nichrome wire carring on temperature increiseament and operates the electric fan to realize the temperature decrease control. The system has the higher measuring accuracy and the control precision, it also can complete the elevation of temperature and the temperature decrease control.
标签： temperature Microcomputer real-tim control
上传时间： 2015-12-10
上传用户：nairui21
In a preemptive priority based RTOS, priority inversion problem is among the major sources of deadline violations. Priority inheritance protocol is one of the approaches to reduce priority inversion. Unfortunately, RTOS like uC/OS can’t support priority inheritance protocol since it does not allow kernel to have multiple tasks at the same priority. Although it has different ways to avoid priority inversion such as priority ceiling protocol, developers still have some difficulties in programming real time applications with it. In this paper, we redesign the uC/OS kernel to provide the ability to support round robin scheduling and implement priority inheritance semaphore on the modified kernel. As result, we port new kernel with priority inheritance semaphore to evaluation board, and evaluate the execution time of each of the kernel service as well as verify the operations of our implementation.
标签： priority preemptive inversion problem
上传时间： 2015-12-14
上传用户：气温达上千万的
We present a particle filter construction for a system that exhibits time-scale separation. The separation of time-scales allows two simplifications that we exploit: i) The use of the averaging principle for the dimensional reduction of the system needed to solve for each particle and ii) the factorization of the transition probability which allows the Rao-Blackwellization of the filtering step. Both simplifications can be implemented using the coarse projective integration framework. The resulting particle filter is faster and has smaller variance than the particle filter based on the original system. The convergence of the new particle filter to the analytical filter for the original system is proved and some numerical results are provided.
标签： construction separation time-scale particle
上传时间： 2016-01-02
上传用户：fhzm5658
The task of clustering Web sessions is to group Web sessions based on similarity and consists of maximizing the intra- group similarity while minimizing the inter-group similarity． The first and foremost question needed to be considered in clustering W b sessions is how to measure the similarity between Web sessions．However．there are many shortcomings in traditiona1 measurements．This paper introduces a new method for measuring similarities between Web pages that takes into account not only the URL but also the viewing time of the visited web page．Yhen we give a new method to measure the similarity of Web sessions using sequence alignment and the similarity of W eb page access in detail Experiments have proved that our method is valid and e币cient．
标签： sessions clustering similarity Web
上传时间： 2014-01-11
上传用户：songrui
