How to simulate and debug the serial port of stm32 with virtual serial port 1

Firstly, install virtual serial port software, such as VSPD, and create two virtual serial ports, such as COM2 and COM 3；;

Secondly, when using MDK for simulation, enter the following contents in the command input line: mode com4 9600, 0, 8, 1 and assign com4.

Finally, use serial port software, such as Gesi Fiberhome, to debug.