05

at89c51 的跑马灯程序. 把LED灯连接到端口0然后用烧录到单片机就行了.(This is an AT89C51 LED chaser program. Connect LEDs to port 1 and then use KEIL to compile the leds1.C into a .hex file then download t to your microcontroller.)

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 )

说明：  STM32F4+HAL库+GPS+地图值，在串口显示(STM32F4+HAL Library+GPS+Map Value, Displayed in Serial Port)

240128液晶初始化程序，调用子函数，有详细注释(240128 LCD initial program, call the son function, and have the detailed notes )

freeRTOS stm32103 stm32 F1054

Ultrasonic range finder based on STM32F103

pic10f322，PWM调光，低功耗模式，开关没有闭合时，进入低功耗模式。(Pic10f322, PWM dimming, low power mode, switch not closed, enter low power mode.)

毕业论文，针对晶闸管三相全控桥式整流电路的主拓扑和调节器进行了设计，主拓扑滤波电路采用了L型滤波器。设计了基于电流模式的双闭环控制系统，并采用工程设计法实现了两个调节器参数的设计，并给出了电流调节器和电压调节器详细的设计过程。(The design of full-bridge control rectifier circuit and controller were studied .The output voltage ripple was inhibited by the L-Filter. )

This documentation, whether, illustrative, printed, ‘online’ or electronic (hereinafter ‘Documentation’) is intended for use only as a learning aid when using Rockwell Automation approved demonstration hardware, software and firmware. The Documentation should only be used as a learning tool by qualified professionals

LED显示屏的设计可以实现动态字体的左移右移上下移动等功能(LED display is designed to realize the right to move to the left and so on down the function of dynamic fonts)