stm32u5 stm32u575 and compiler optimization.

[picdev2]

I have port tiny usb on stm32575 and work as expected. I run cdc and dfu. My system clock is at 16mhz.
The only problem I have is that usb work only with compiler optimization zero -o0, if I increase the optimization level usb never start and windows does not recognize any device.
I have not try to make any debug yet, is this something common for this mcu ?

[HiFiPhile]

Maybe it's the same underline issues with #3253

[picdev2]

thank you for your response but I think that stm32u575 use synopsys driver, so this fix does not apply to my case.

[HiFiPhile]

Oh thank you for remind me, I thought only U59x and plus use dwc2 driver.

You can enable the log to see what happend.

BTW could you dump the controller info, you can put it in here

tinyusb/src/portable/synopsys/dwc2/dwc2_info.py

Line 11 in 8f2e3ed

dwc2_reg_value = {

[picdev2]

thank you for your help, after debugging the problem exist on HALL USB functions, the code stack on usb core reset function and timeout dont work also.
tiny usb has nothing to do with this.