Keil5 software simulation waveform and solution to unknown signal

When I was writing a report a few days ago, I accidentally needed to use the software simulation in Keil5 to see the output PWM waveform. After several attempts, I finally figured it out. The problem of unknown signal also appeared.

1. Setting steps for software simulation with Keil5

First, as shown in the figure below, you need to set it to software simulation (it is not possible to set it to hardware simulation here), and then the following parameters also need to be changed. The second red circle checked -pSTM32F103ZE is based on your own chip

Settings. Here I choose the STM32F103ZET6 chip.

2. Basic simulation settings

First enter the simulation settings, then click the waveform viewing icon.

Set the simulation parameters by clicking Setup...

Set up and add the hardware IO ports that need to be viewed. Enter the pins that need to be observed, such as PORTX.i, in setup.

If unknown signl appears at this time, it is a problem with the debug settings.

At this time, you need to return to the simulation settings in the first step to check whether it is set according to your own development board.

After adding the IO ports that need to be viewed, click RUN to run.

If you don’t see the waveform appear in the box at this time, check whether your settings are reasonable.

Right click on the left side of the logic analyzer to set the data of each wave to bit and Hexadecimal values

If the waveform does not change dynamically at this time, you need to check whether the following settings are available

If you need to adjust the waveform to facilitate viewing, click in out all to adjust the waveform.

It is particularly important to note that my IO is set to open-drain output, but the simulation cannot output the waveform. This problem has been bothering me for a long time.