Runge_Kutta

使用stm32开发板做的pwm输出控制buck电路，反馈使用PID算法，实现闭环控制(The use of STM32 development board to do PWM output control buck circuit, feedback using PID algorithm to achieve closed-loop control)

利用Easy5509开发板的TMS320_5509A芯片开发的12864中文液晶驱动程序，可以实现图形显示和中文字符显示两种模式的驱动。液晶管脚的驱动方式是通过访问EMIF外部地址驱动外部CPLD实现。(On the platform of TMS320_5509A DSP chip to write the driver function of 12864 Chinese Character LCD. The project can realize the 2 driver models of 12864LCD.The LCD bin control is implemented by the way of write the external memory interface address to transmit the signal to LCD through a CPLD chip.)

开锁程序,可以通过DA1990a打开门的锁，并不需要注册钥匙。(Unlock procedure, you can open the door lock DA1990a is no need to register the key.)

基于At89c52和数码管实现的秒表，具有正向计时、倒计时和清零功能，三个按键分别对应k1（开始计时、暂停、继续）、k2（倒计时、暂停、继续）、k3（停止、归零）。文件包括源码、工程文件、仿真原理图和工程文件。(Based At89c52 and implement digital stopwatch, has a positive time, countdown and clear function, three buttons corresponding to k1 (start time, pause, resume), k2 (countdown, pause, resume), k3 (stop, zero ). File contains the source code and schematics.)

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

键盘输入数据和保存数据的程序,适合4键盘的机器(Keyboard input of data and procedures for preservation of data, suitable for 4 keyboard machines)

AD0809驱动程序+1602液晶显示，完美的显示电压值，(AD0809 driver+1602 LCD, perfect display voltage,)

基于90s2313的计算机并口频率计，有图纸和源代码(Parallel computers based 90s2313 frequency meter, there are drawings and source code)

STM32单片机freemodbus的移植，主从机的都有(1, transplant FreeModbus1.5 and RT-Thread1.1.1 to STM322, development platform supports Eclipse, Keil, IAR3, can be used in the Eclipse plug-in version management EGIT 4, support Modbus RTU (ASCII untested))

说明：  使用 AT89C52 单片机开发，功能是1个数据管，显示0 至 9。(Developed with AT89C52 single chip computer, the function is a data tube, displaying 0 to 9.)