I have root caused the reason: My variable is only updated in the while 1 loop but not read by the software at all. If I set Access as "Read", then no waveform is shown because the variable is never read. Once I change the access to "Read/Write" or "...

Thank you for your suggestion. I have root caused the reason: I did not setup the variable correctly. My variable is updated in the while 1 loop but not read by the software. If I set Access as "Read", then no waveform is shown. Once I change the acc...

I am using STM32CubeIDE and a Nucleo-68 board from the Nucleo pack (P-NUCLEO-WB55) with the same problem. I can see the variable is changing but nothing can be seen on the SWV Data Trace Timeline Graph. Do I have to use a jumper or solder bridge etc....