PWR_CSR2_USB33RDY flag is not set in Nucleo-H7S3L8

[yamamo2shun1]

I was able to get CDC_Standalone in STM32CubeH7RS running on Nucleo-H7S3L8.

Next, I am trying to get USB FS CDC running based on the Templates_board project.

First, I need to modify the .ioc file to display the COM port in the Windows Device Manager. However, the USB regulator ready flag (PWR_CSR2_USB33RDY) is not set within HAL_PWREx_EnableUSBVoltageDetector(), causing a timeout.

I have attached the current .ioc file.

Any advice would be greatly appreciated.

[yamamo2shun1 · Accepted solution]

I found the solution by myself.

As shown in the image, when “USBD_SELF_POWERED” is enabled, the USB regulator ready flag is now set.

[mkrk]

I see similar issue on STM32H7R3L8HxH using STM32CubeIDE v1.19.0 and CubeMX version 6.15.0.

We use external USB supply in design: 3.3V goes into VDD33USB and VDD50USB. PWR is configured not to use USB regulator (it is unchecked):

Based on chapter 6.4.7 USB regulator in reference manual it seems that USB33RDY does not need to be checked when using external supply.

However, CubeMX still generates HAL_PWREx_EnableUSBVoltageDetector() call into HAL_MspInit() and it fails with timeout because USB33RDY does not get set.

I tried different CubeMX options include the solution above, but that doesn't help or even can't help, because device initialization takes place after HAL_Init() where the issue occurs.