Problem with USB on STM32L412KBT

[MKele]

Hi, I have problem running USB on STM32L412KBT. The code hangs inside MX_USB_DEVICE_Init. Sometimes in function HAL_StatusTypeDef USB_DevInit(USB_TypeDef *USBx, USB_CfgTypeDef cfg) (file stm32l4xx_ll_usb.c), sometimes in function HAL_StatusTypeDef USB_DevConnect(USB_TypeDef *USBx) (the same file).

• Using CubeMX 5.2.1, STM32Cube FW_L4 V1.14.0
• Custom board, stable 3v3 power source with many filtering capacitors
• Successfully upload code using USB DFU, so I think wiring is OK
• Tried multiple CPU clock speed
• Tried multiple USB clock source
• Tried multiple USB class type CDC, HID, ...
• When I comment MX_USB_DEVICE_Init all other peripherals seems to work correctly

Any help appreciated...

[Pavel A.]

As a quick workaround, while waiting for more useful replies, try to disable interrupts around MX_USB_DEVICE_Init()

-- pa

[MKele]

__disable_irq() did not help.

Strange thing is that it randomly hangs on different places.

One thing I forgot to mention is that I am using crystal-less USB, but I should be OK with this CPU. Is there anything special that I must setup or the CubeX generated code should be fine ?

Thanks....

[Pavel A.]

Next quick try while waiting for more useful replies: increase stack size,

[MKele]

No luck with stack size...

[waclawek.jan]

https://community.st.com/s/question/0D50X0000AX6OLe/nucleol412kb-usbcdc-initial-fail ?

JW

[MKele]

Yes... thank you...