Enabling RCC clocks to USBH peripheral in stm32mp1

[srikanth]

Hello

We are unable to write into USBH registers in stm32mp157.

Actually, we enabled USBHEN and USBHLPEN bits in AHB6ENSETR and AHB6LPENSETR registers.

Then we are unable to access USB memory.

We tried other peripherals same way means enabling clock in rcc registers and accessing respected peripherals memories.

Now what is the issue to USB and How can I access USBH memory.

we followed RM0436 manual.

Thanks & regards

srikanth

[PatrickF]

Hi @srikanth​ 

did you progress on this ?

USBH follows EHCI/OHCI standard, I guess there is no accessible memory inside as I think they are using descriptors stored in DDR.

Btw, USBH receive many clocks from USBPHY, did you also enable and configured the USBPHY and started the associated 480MHz PLL ?

 

Regards,

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