实现功能简介：
1）联动功能：
两部电梯之间相互联动，即同时按下任何一部电梯的外部向上或向下键之后，两部电梯同时接受此指令，然后由系统判断，与该请求所在楼层最近并且运行方向相同的电梯执行指令，另一部电梯不执行该指令。
2）手动开门功能：考虑到在实际生活中可能出现电梯上客时间不够的情况，在电梯内部设置了该功能，按下开门键，电梯延长开门时间。
3）报警功能：本例中为报警状态设置了单独的状态，意在考虑到现实生活中多种多样的报警原因，报警之后，门打开，处于等待修理的状态，在修理完毕之后，按下复位键使得电梯重新开始运行。
Function introduction:
1) linkage function:
Two elevators linkage between, that is, at the same time in an elevator any external up or down key later, two elevators and accept the instructions, then the system judgment, and the request in the floor and running the same direction recently the elevator the instruction execution, another lift not execute the instructions.
2) manual open the door function: to consider in the practical life may appear on the elevator of guest time enough, in the elevator set up inside the function, press the key to open the door, elevator extend time to open the door.
3) alarm function: in the case of the state for alarm set separate state to consider to real life DuoZhong variety of alarm reason, after the alarm, the door opened, in a waiting state of repair, in after the repair, press the reset button to make elevator start running. (2011-11-07, VHDL, 14KB, 下载9次)
本文介绍了两相四拍混合式步进电机的工作原理及其磁网络模型，推
导了步进电机的动态方程。分析了两种细分驱动方法:等电流法和电流
矢量法恒幅均匀旋转法，提出了基于单片机控制的PWM电流矢量恒幅
均匀旋转的细分驱动技术，实现了步进电机32细分驱动。为了补偿步进
电机相绕组电流与其产生磁场之间非线性引起的误差，采用了最小二乘
法对细分步距角误差曲线进行了拟合与修正，提高了细分精度。为了检
测32细分后的步距角，采用了自准直仪加精密数显转台的光学测量方法，
并给出了实验结果，32细分步距角的均方误差不大于3.7 。
Stepper Motor Technology (2010-04-17, VHDL, 1510KB, 下载85次)
本文介绍了基于可控电流源的高精度高细分数步进电机细分驱动方法，采用
PwM(脉冲宽度调制)和5阶巴特沃斯低通滤波器实现了双14位精度较高的DAc，用
于控制精密可控电流源的电流输出，使得励磁线圈中流经的电流为稳定的直流，实现
了步进电机低噪声，高稳定度的细分驱动运行。
This article describes the controlled current source based on the subdivision number of high precision stepping motor driving method, using PwM (pulse width modulation) and 5-order Butterworth low-pass filter to achieve a double-precision 14-bit high DAc, precision controlled current source for controlling the current output, making the current flowing through the coil excitation for the stability of the DC, stepper motor to achieve a low noise, high stability of the sub-drive operation. (2010-04-16, VHDL, 2892KB, 下载74次)