testPWM

本源码采用C51编写。单片机读写信息纽扣，DS1990A(mcu read DS1990A)

Another source code for LCD DISP

单片机按键识别，用于实现不同的键盘输入的识别与后续操作。(The single-chip button recognition is used to realize the recognition and subsequent operation of different keyboard inputs.)

前视双基地SAR（Bistatic Forward-looking SAR)(BFSAR)是对双基地工作模式的一种拓展，能对飞行路线正前方区域进行较高分辨率成像，能消除侧视模式中存在的固有成像盲区，是传统侧视模式的重要补充，具有自身不可替代的优越性。因此对于前视双基地SAR的深入研究具有相当的价值。(Forward-looking Bistatic SAR (Bistatic Forward- & SAR) (BFSAR) is a kind of double base work mode of development, can be directly in front of flight path area of high resolution imaging, can eliminate inherent imaging side-looking mode existing in the blind area, is an important supplement of traditional side-looking mode, has its own irreplaceable advantages. So for the front of the further research of bistatic SAR is quite valuable. )

说明：  定时器2相关例程，包含定时器的运用，0-99计时，18b20的运用。(Timer 2 related routines, including the use of timers, 0-99 timing, 18B20 application.)

3 leds blinking for CCS compiler

A fuzzy expert system for loss reduction and voltage control in radial distribution systems

说明：  使用AT89C52单片机开发，功能是控制直流电机运行，可调速。(Developed with AT89C52 single chip computer, the function is to control the operation of DC motor and speed regulation.)

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)

freettos的最小系统移植，亲测能编译成功，使led灯周期闪烁(freertos ,stm32f103,keil5,c++)