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
根据现今的交通系统中驾驶员不能获取塞车状况的实时信息的情况,设计出了基于ZigBee无线组网城市交通中的塞车状况的自动预警系统。本系统可以为某一时刻正在或将要出行车辆和出行人员提供实时的路况信息,从而自动分流出行车辆与人员,减轻了车辆过于拥挤的现状并极大地缓解了交通道路的压力。
上传时间: 2013-11-09
上传用户:wentianyou
TKS仿真器B系列快速入门
上传时间: 2013-10-31
上传用户:aix008
阐述了轨道交通列车定位技术。介绍了在轨道交通系统中列车定位技术的功能,国内外轨道交通中主要采用的列车定位方法,重点论述了几种主要定位技术,并从定位精度、闭塞制式、维护投资成本、抗干扰等方面进行分析比较。提出目前轨道交通定位技术应综合运用,取长补短,多种方法相互融合,才能满足轨道交通中对安全可靠性的要求。 Abstract: Rail train positioning technology is described. The paper introduces the funetions of the train positioning technology in the rail transit system, the main methods of train positioning do mestic and international rail, and focuses on several key methods, analyzes and compares from the positioning accuracy, block system, maintenance and investment cost, interference and so on, suggested that the current rail positioning technology should be integrated use of positioning method of meriging, learn from each other, to meet the reliability requirements of rail safety.
上传时间: 2013-11-25
上传用户:franktu
一个简单好用的B+树算法实现
上传时间: 2015-01-04
上传用户:缥缈
一个用Basic实现的B-Tree算法
上传时间: 2013-12-30
上传用户:ccclll
一个用Java applet实现的B-Tree算法
上传时间: 2013-12-25
上传用户:qiao8960
用C++实现的B-Tree算法
上传时间: 2014-01-20
上传用户:jiahao131
用Borland C写的B-Tree算法
上传时间: 2014-12-05
上传用户:xzt
java 版B+树程序
上传时间: 2015-01-06
上传用户:chenjjer