在STM32F103上实现双定时器1S定时，利用RS232串口发送数据，利用中断检测PS2键盘和PC机交换信息并在串口助手上显示-In the STM32F103 dual timer 1 S timing, using RS232 serial send data, using interrupt the PS2 and PC keyboard detection to exchange information and serial port on display in assistant