[bug report] USB CDC Serial Number in release build not working

[yourigh]

Hello, I would like to report a bug on USB CDC middleware generated from CubeMX 6.11. 

When I use it in Debug build, everything works as expected. Once I switch to Release, the compiler optimizes out the serial number.  I use official VScode extention with Cmake to build the FW.

Without a serial number at USB device, Windows fails to recognize that anything is connected. It works in Linux only. 

I have the same issue happen at STM32F411 and STM32L433. 

The solution was to add initalization to 3 lines in USB_DEVICE\App\usbd_desc.c

uint32_t deviceserial0 = *(uint32_t*)DEVICE_ID1;
uint32_t deviceserial1 = *(uint32_t*)DEVICE_ID2;
uint32_t deviceserial2 = *(uint32_t*)DEVICE_ID3;

I hope this helps someone and the STM may fix it. No support is needed.
Thanks.

[STTwo-32 · Accepted solution]

Hello @yourigh 

This is a Know issue (as what is in this post) that has been solved on the Version 6.11.1 and 6.12.0. So, you just have to update your STM32CubeMX to the last version. 

Best Regards.

STTwo-32