STM32虚拟串口，能利用VB作为上位机，可以喝下位机进行通讯-STM32 virtual serial port

unicom这个的protel的电气图，上位机与单片机的通讯电路图，很难得，大家可以参考下-unicom the electrical diagram of protel, PC and single-chip communication circuit, so hard, we can refer to the next! ! !