可以自动生成BCC校验码，经检验程序无错

本例展示了如何设置TIM，用它来测量一个外部输入信号的频率和占空比。 TIM2时钟设置为72MHz，预分频设置为0，TIM2计数器时钟可表达为： TIM2 counter clock = TIMxCLK / (Prescaler +1) = 72 MHz，因此可测量的最小频率值为1100Hz。 设置TIM2工作在PWM输入模式（PWM Input Mode），把外部信号作为输入连接到TIM2通道2。 利用TIM2计数器中断来测量信号的频率和占空比。在TIM2_IRQHandler中，计算信号的频率和占空比，方法如下： 变量"Frequency"为由下式得到的外部信号频率： Frequency = TIM2 counter clock / TIM2_CCR2 单位Hz 变量"Duty_Cycle"为由下式得到的外部信号占空比： Duty_Cycle = (TIM2_CCR1*100)/(TIM2_CCR2) 单位 (This example shows how to set up the TIM, and use it to measure the frequency and duty cycle of an external input signal. TIM2 clock set to 72MHz and the prescaler is set to 0, TIM2 is counter clock can be expressed as: TIM2 is counter clock = TIMxCLK/(prescaler. Ppls1) = 72 MHz, the minimum measurable frequency value of 1100 Hz. Set TIM2 PWM input mode (PWM Input Mode), the external signal as an input connected to the the TIM2 Channel 2. TIM2 counter interrupt signal to measure frequency and duty cycle. Calculate the frequency and duty cycle of the signal in TIM2_IRQHandler as follows: variable " Frequency" on the grounds of the external signal frequency by the following formula: Frequency = TIM2 is counter clock/TIM2_CCR2 unit Hz variable Duty_Cycle " on the grounds of the following formula to get external duty cycle: Duty_Cycle = (TIM2_CCR1* 100)/(TIM2_CCR2) in )

控制流水灯（状态可调）工作； 显示当先剩余时间（秒）； 无剩余时间流水灯熄灭； 输秘码进入设置状态。 能够自己设置并修改控制时间

说明：  超声速静压探针程序，采用有旋特征线法求解旋成体绕流流场，能给出任意马赫数下的壁面沿程压力分布情况，给出壁面静压恢复到自由来流静压的位置；(Supersonic hydrostatic probe program)

企站帮企业网站管理系统 基于asp.net（C#）开 发！ 希望对大家 有用，仅供学习，勿用于商业开发！

单片机外部中断例程， 主要参考外部中断使用的。(int use program)

《Qt及Qt Quick开发实战精解》代码

用于开发基于MEGA8上的小系统OS，很经典很小。适合于低配置的单片机上面开发使用。(For the development of small systems based on MEGA8 OS, is the classic small. Configure the microcontroller for low use of the above development.)

CVI环境下的串口调试助手，主要功能有即时收发信息，显示波形，截图和保存数据(CVI environment serial debugging assistant, the main function includes immediately send and receive information to display waveforms, capture and save data)

说明：  测绘技能大赛试题03 帮助需要进行比赛的同学解除困难(Question 03 of Surveying and Mapping Skills Competition)

基于51单片机的简易交通灯的设计，能够实现简易交通灯功能。(Design of Simple Traffic Light Based on 51 Single Chip Microcomputer)