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设计的电机驱动控制系统的主要功能有①控制电机的正转、反转；②为电机设计控制速度，有5m/s、10m/s、15m/s三个等级；③给电机设定转动的位移，让电机按照设定的位移移动；④1602液晶上显示电机的位移和速度；⑤利用4*4键盘数字输入控制电机的速度、按键C和D控制正反转、按键B控制三个档位的速度。(Using SCM software and hardware systems to achieve precision stage displacement, velocity through three or four phase stepper motors (motors meet the acceleration and deceleration characteristics), control the direction, location. Completion of the control circuit board hardware, including CPU, power amplifier, buttons, LED display. Software can be implemented in C.)

codejock 13 and activasi

ad采集及12864显示额程序 基于atmega128(ad 12864)

Delta servo drive a new generation of hardware ASDA-B2 manual programming is an electrical engineer hardware reference manual,

搭建onvif设备端代码 非常有用，可以配合ONVIF Device Manager测试(Device-side code to build onvif)

上位机通信-配合XTMonitor显示温度等(PC communication- with XTMonitor display temperature, etc.)

无线传感器网络中发现从权有向图的定顶点的最短路径发现从权有向图的定顶点的最短路径( finds shortest paths a given vertex of a weighted directed graph)

CD4051/CC4051是单8通道数字控制模拟电子开关，有三个二进控制输入端A、B、C和INH输入，具有低导通阻抗和很低的截止漏电流。(CD4051/CC4051 is single channel 8 digital controlled analog electronic switch, there are three binary control input A, B, C and INH input, has low conduction resistance and very low by leakage current.)

说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)

这是基于STM32的USART转232的应用程序(This is based on the STM32 USART 232 applications)