spi

使用飞思卡尔的单片机MPC5643L实现的电机控制代码(This is motor control with freescale CPU mpc5643l)

这是利用51单片机设计成的8路抢答器,主持人按下“开始”按键才开始抢答，并亮抢答允许指示灯(Host press the start button to vies to answer first, light and bright vies to answer first allowed.)

用电脑串口控制单片机流水灯状态,用电脑串口控制单片机流水灯状态(Serial control with a computer chip light water status)

数字时钟显示时间、定闹钟及整点报时，还能实现时钟界面的切换功能(Digital clock displays the time, set the alarm and hourly chime)

可以产生幅度、频率可调的方波，频率50hz到1M(Can produce the amplitude, frequency adjustable Fang Bo, frequency of 50Hz to 1M)

fluent物性随温度变化的udf（包括导热和比热）；边界条件温度随时间变化的udf。(fluent physical properties with temperature changes udf (including thermal conductivity and specific heat) temperature boundary conditions change over time udf.)

说明：  简单的流水灯控制和外部中断程序和键盘指针的应用(Simple light control and external interrupt water program and the application of the keyboard pointer)

滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)

240128演示程序 采用t6963演示汉字(unsigned int i,j CmdWrite(0x5c) DataWrite(0x00) DataWrite(0x00) CmdWrite(0x46) DataWrite(0x00) DataWrite(0x04) //csr=0x0400 字摸地址80H CmdWrite(0x4c) CmdWrite(0x42) )

基于51单片机的简单c语言小程序，用于蜂鸣器的测试等(Based on 51 single simple small c language program for testing the buzzer)