In my project (STM32F407, MDK-ARM4.54) I cannot change the values of peripheral registers in the watch window. The values are displayed correctly, but I cannot change them. (e. g. ADC1->JSQR - channel selection register of ADC1). Possibly it is due to the variable range (0x40000000 compared to 0x2000000)? The normal variables work well now, also the static members of classes, thank you very much.
I tried to open the system viewer to have a look at the ADC1 module there, but the system viewer sub-menu in MDK-ARM4.54 is displayed empty (not any sub-entries) - in earlier versions I think I could have a look at the controller modules there.
PS: It is not ultimately required for me, to change values of peripheral registers in the watch window, I can live with MDK 4.54 well - just it would be helpful, if this would work.
Thanks for the info, now we have the same behavior reproducible on both sides :-) We'll work on this!