boost, buck

说明：  STM32F103RCT6矩阵键盘，4×4键盘，按键串口打印(STM32F103RCT6 Matrix Keyboard, 4*4 Keyboard, Key Serial Port Printing)

此为quautus教程,请各位仔细去看吧,有不懂的和我联系(This is quautus tutorial, please look at it carefully, and I do not have contact)

计算电厂经济性指标，学生课设作品，如有错误概不负责(To calculate the economic index of the power plant, the students are set up in the class and are not responsible for the mistakes.)

表达式求值程序，很好的实现表达式的ascii码输入，到数值计算(Expression evaluation procedures, to achieve a very good expression of the ascii code input to the numerical calculation)

实时侦测某个COM口打开和关闭。 实时显示某个COM口发送和接受的数据。 测试某个COM口，打开，关闭，读数据，写数据。 (Real-time detection of a COM port to open and close. Real-time display of a COM port to send and receive data. Testing a COM port, open, close, read data, write data.)

83_REALTEK8019as 芯片资料（中文）(83_REALTEK8019as chip data (Chinese))

说明：  类似于vs，浩方对战平台源码，仿写的一个平台程序(Similar to a platform for program vs. ho war platform source, Imitative)

说明：  EPSON VB6.0 OPOS开发源代码，很好用的(EPSON VB6.0 OPOS development source code, very good use)

构造函数使用方法的总结，使用多种类型的构造函数创建对象。(Constructors use of the summary, the use of various types of Constructors object creation.)

一个发票打印程序，含VB源代码，可以打印发票，可自行修改发票样式。(An invoice printing program, including VB source code, can print invoices, can modify the invoice style.)