STM32F103的串口2中断读写，并且记录中断次数。-STM32F103 serial 2 interrupt to read and write and record the number of interrupts.

STM32F103VET6串口收发的相关程序(STM32F103VET6 serial transceiver related procedures)

使用中断方式i实现在STM32F103上的矩阵键盘。修改端口所有的需要修改的地方已用宏定义列出。方便修改(Use interrupt mode I to implement the matrix keyboard on STM32F103. All the modifications needed to modify the port are listed in the macro definition. Convenient modification)