USB PHY issue in STM32mp157A

[Srikanth1]

Hello,

I am working on a custom board based on STM32MP157A and I am getting all the bits correctly but getting values at reserved bits in USBPHYC version register (Internal) which are supposed to be reserved  as per the reference manual.

Below mentioned screenshots contains :

1.Register from reference manual:

2.Below attached image contains values I am getting when reading the register:

 

And I am confused on how to move forward with usbphy.I hope someone could help me with the problem

Thanks&Regards

Srikanth

 

[PatrickF]

HI @Srikanth1 

you are right, there is a mistake in the offset of this register in the reference manual. Correct offset is 0x3F4

Thanks to pointing this issue, will be corrected in a future revision of the document.

Regards,

[Srikanth1]

Hi @PatrickF

            Thanks for the reply,now we could read the register correctly.And as of now I am stuck on how to move forward and what can be the next step to be done.

I hope You could help me with forward with the usb.

Thanks &Regards,

srikanth.

[PatrickF]

Hi,

worth to enter a new post describing the issues you encounter with USB.

meanwhile, some useful links

https://wiki.st.com/stm32mpu/wiki/USB_overview

https://wiki.st.com/stm32mpu/wiki/How_to_adjust_USBPHYC_settings_using_USB_Eye_Diagram

 

Regards.