基于单片机的计算器及密码锁程序设计.docVIP

编号 本科生毕业单片机计算器及密码锁程序设计The design of the SCM calculator and password lock program 学 生 姓 名 韩雪峰 专 业 08331 学 号 0833115 指 导 教 师 郭丹伟 分 院 电子工程分院 2012年 月 摘 要 智能化是当今光、机、电一体化产品的发展趋势之一，而智能性的实现主要依赖于嵌入式系统的核心单片机。仿真器不但是开发单片机系统的重要手段，也是学习单片机知识的必备工具。论文分别介绍了单片机仿真系统的硬件设计和软件实现。 硬件设计包括仿真芯片的选型，单片机的资源应用及扩展电路，如：8255并口扩展、发光二极管、七段动态数码显示4×4键盘输入、蜂鸣器等。 软件部分包括两个大程序：密码锁程序和计算器程序。密码锁程序实现3-8位可变密码的输入、修改和密码输入正确后的授权操作功能，密码错误后有声光报警（不同的报警次数对应不同的报警方式）。计算器程序实现带符号浮点数的加、减、乘、除及开根号的功能，设计中加入了第二功能键解决了按键有限的问题。这两个程序主要应用了单片机教材中中断、动态显示、键盘输入、I/O接口这些重要功能，具有良好的示范作用。 本系统不但可以应用于单片机教学，对大多数电子爱好者开发简单的仿真器也有借鉴作用。 ABSTRACT Intelligence is one of the development trend of todays optical, mechanical, electrical integration products. Intelligence to achieve the main dependent on the core microcontroller for embedded systems. The emulator is not only an important means to develop single-chip system,but also is a necessary tool to learn the MCU knowledge. The paper describes the microcontroller simulation system hardware design and software implementation Hard ware design, including simulation of chip selection, application and expansion of the circuit of the microcontroller resources, such as: 8255 parallel port expansion, light-emitting diodes, seven-segment dynamic digital display 4 × 4 keyboard input, buzzer The software part includes two procedures: lock procedures and calculator program.Lock program authorized operating functions in the 3-8 variable password input, modify and password to enter the correct password is incorrect after sound and light alarm.The calculator program signed floating-point add, subtract, multiply, and in addition to the square root function, designed to add the second function key to solve the key problem of limited.These two procedures are mainly applied to interrupt the microcontroller textbooks, dynamic display, keyboard input, the I / O interface of these important functions, with a good role model. This system not only can be applied to the microcontroller refe