基于单片机的数字化B超键盘设计

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.    

标签： 单片机 B超 数字化 键盘设计

上传时间： 2013-10-10

上传用户：asdfasdfd

TKS仿真器B系列快速入门

TKS仿真器B系列快速入门

标签： TKS 仿真器 快速入门

上传时间： 2013-10-31

上传用户：aix008

NCV7356单线CANBUS收发器数据手册

The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.

标签： CANBUS 7356 NCV 单线

上传时间： 2013-10-24

上传用户：s蓝莓汁

一个简单好用的B+树算法实现

一个简单好用的B+树算法实现

标签： 树 算法

上传时间： 2015-01-04

上传用户：缥缈

一个用Basic实现的B-Tree算法

一个用Basic实现的B-Tree算法

标签： B-Tree Basic 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

一个用Java applet实现的B-Tree算法

标签： B-Tree applet Java 算法

上传时间： 2013-12-25

上传用户：qiao8960

用C++实现的B-Tree算法

用C++实现的B-Tree算法

标签： 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

用Borland C写的B-Tree算法

标签： Borland B-Tree 算法

上传时间： 2014-12-05

上传用户：xzt

《3D Engine Design》的随书源代码