8255A

AT89C2051驱动步进电机的电路和源码(用keilC51)(AT89C2051 stepper motor drive circuits and source code (using keilC51))

ADXl345 driver ADXl345 driver ADXl345 driver

通过使用STM32F407内部的ADC资源，开发出的一款简易版示波器，能够识别并画出波形，显示频率、幅值等要素，可以调Time ，VPP level等。代码简单易读。(By using ADC resources in STM32F407, a simple version oscilloscope is developed, which can recognize and draw waveforms, display frequency, amplitude and other elements, and adjust time, VPP level, etc. The code is easy to read.)

stm32F103 TIM1输出7路PWM STM32F103ZET6总共有8个定时器，TIM1和TIM8是高级控制定时器，TIM2、3、4、5是通用定时器， TIM6和TIM7是基本定时器。 本例程实现高级控制定时器TIM1总共7个功能引脚输出PWM波形。(STM32F103ZET6 has 8 timers in total, TIM1 and TIM8 are advanced control timers. This routine implements an advanced control timer TIM1 that outputs PWM waveforms for a total of 7 function pins.)

于市售 STM32 开发板上实现特定人语音识别处理项目。识别流程是：预滤波、ADC、分帧、端点检测、预加重、加窗、特征提取、特征匹配。端点检测(VAD)采用短时幅度和短时过零率相结合。检测出有效语音后，根据人耳听觉感知特性,计算每帧语音的 Mel 频率倒谱系数(MFCC)。然后采用动态时间弯折(DTW)算法与特征模板相匹配,最终输出识别结果。先用Matlab对上述算法进行仿真，经数次试验求得算法内所需各系数的最优值。而后将算法移植到 STM32 开发板上，移植过程中根据 STM32 上存储空间相对较小、计算能力也相对较弱的实际情况，对算法进行优化。最终完成于 STM32 微处理器上的特定人语音识别系统。(Implement speech recognition processing project in commercially available STM32 development board. Identification is the process: pre-filter, ADC, framing, endpoint detection, pre-emphasis, windowing, feature extraction, feature matching. Endpoint detection (VAD) short-time amplitude and short-term zero rate combined. After detecting an effective voice, according to the characteristics of human auditory perception, calculated for each frame of speech Mel Frequency Cepstral Coefficients (MFCC). Then dynamic time warping (DTW) algorithm and feature template matches the final output recognition result. First with Matlab simulation algorithm described above, after several trials to get the optimal value of each coefficient within the desired algorithm. The algorithm will migrate to STM32 development board, the porting process according to the STM32 relatively small storage space, computing power is relatively weak situation of the optimization algorithm. Finally completed on the STM32 micr)

用于空中鼠标的加速度计对整个系统的优化，主要用于优化陀螺仪的性能(Accelerometer for air mouse to optimize the whole system is mainly used to optimize the performance of the gyroscope)

51单片机数字钟程序，数码管显示时分秒，按键切换显示日期，包含闰年处理。(51 microcontroller digital clock program)

stm32单片机与2.4G无线模块nrf24l01的通讯程序，stm32f103VCT6发送stm32f103C8T6接收(Stm32 MCU and 2.4 G wireless module nrf24l01 communication program, stm32f103VCT6 sent stm32f103C8T6 received)

这是一个基于C51的软件模拟串口程序，希望对大家有用。(This is a C51-based simulation software serial procedures in the hope that useful.)

基于C语言编写一个程序，实现将存放在文件中的学号、姓名、电话等信息读出并显示出来。(Write a program based on the C language, the implementation will be stored in a file number, name, telephone and other information is read out and displayed.)