交通信号灯的控制: 1. 通过8255A并口来控制LED发光二极管的亮灭。 2. A口控制红灯,B口控制黄灯,C口控制绿灯。 3. 输出为0则亮,输出为1则灭。 4. 用8253定时来控制变换时间 。 要求:设有一个十字路口,1、3为南,北方向,2、4为东西方向,初始态为4个路口的红灯全亮。之后,1、3路口的绿灯亮,2、4路口的红灯亮,1、3路口方向通车。延迟30秒后,1、3路口的绿灯熄灭,而1,3路口的黄灯开始闪烁(1HZ)。闪烁5次后,1、3路口的红灯亮,同时2、4路口的绿灯亮,2、4路口方向开始通车。延迟30秒时间后,2、4路口的绿灯熄灭,而黄灯开始闪烁。闪烁5次后,再切换到1、3路口方向。之后,重复上述过程。
上传时间: 2014-01-03
上传用户:zhouli
毕业设计关系b/s系统 毕业设计管理工作 毕业设计管理数据
上传时间: 2013-12-06
上传用户:1101055045
php开发的行业搜索系统!!! 2. 安装 ------------ a. 解压程序rar文件,用二进制方式上传到你的网站的根目录或某一目录下 注意:一定要将ftp上传工具设置为二进制方式,再上传程序文件 b. unix或linux服务器下, 将以下文件属性改为:666 (或777) - function/base_info.php - function/emphasis_info.php - function/admin_pass_info.php - function/search_info.php - function/userfield_info.php - template/default/目录下的所有html文件 c. unix或linux服务器下, 将upfile/目录属性改为:777 d. 建立一个mysql数据库,并记下用户名和密码,以便安装时使用 e. 进入安装目录http://www.your_website.com/install/, 自动运行安装程序 f. 安装完成后,要求删除安装目录install/及其下文件 g. 后台管理目录http://www.your_website.com/adiministrator/ h. 可修改adiministrator/目录为你希望的独特的名字
上传时间: 2014-11-29
上传用户:小草123
键盘任意输入一个稀疏矩阵A(m*n),采用三元组存储方法求其转置矩阵B(n*m),并用快速转置算法实现该操作。
上传时间: 2013-12-08
上传用户:lingzhichao
design LP,HP,B S digital Butterworth and Chebyshev filter. All array has been specified internally,so user only need to input f1,f2,f3,f4,fs(in hz), alpha1,alpha2(in db) and iband (to specify the type of to design). This program output hk(z)=bk(z)/ak(z),k=1,2,..., ksection and the freq.
标签: Butterworth internally Chebyshev specified
上传时间: 2015-11-08
上传用户:253189838
This a USB core stack for the built-in USB device of LPC214x microcontrollers. It handles the hardware interface and USB enumeration/configuration. Also included are application examples like a USB joystick HID and USB serial port emulation.
标签: microcontrollers USB the built-in
上传时间: 2015-11-14
上传用户:talenthn
JSP中文网新闻发布系统是由jsp中文网为了方便管理自己的相关技术文章而编写的b/s模式的集新闻发布、管理与一体的新闻发布系统。
上传时间: 2014-01-22
上传用户:13215175592
This document provides guidelines for integrating a discrete high speed USB host controller onto a fourlayer desktop motherboard. The material covered can be broken into three main categories: Board design guidelines, EMI/ESD guidelines and front panel USB guidelines. Section 1.1 Background provides an explanation of the routing experiments and testing performed to validate the feasibility of 480 Megabits per second on an actual motherboard. Section 7 contains a design checklist that lists each design recommendation described in this document. High speed USB operation is described in the USB 2.0 Specification (http://www.usb.org/developers/docs.html).
标签: integrating controller guidelines document
上传时间: 2013-11-27
上传用户:电子世界
This document provides guidelines for integrating a discrete high speed USB host controller onto a fourlayer desktop motherboard. The material covered can be broken into three main categories: Board design guidelines, EMI/ESD guidelines and front panel USB guidelines. Section 1.1 Background provides an explanation of the routing experiments and testing performed to validate the feasibility of 480 Megabits per second on an actual motherboard. Section 7 contains a design checklist that lists each design recommendation described in this document. High speed USB operation is described in the USB 2.0 Specification (http://www.usb.org/developers/docs.html).
标签: integrating controller guidelines document
上传时间: 2015-11-18
上传用户:xhz1993
B-spline曲線是包含Bezier曲線的通用數學表示法。
上传时间: 2015-11-22
上传用户:whenfly