How to use USB peripheral with TrustZone enabled on the STM32U545

[KMak]

I am using USB peripheral on the STM32U5 with TrustZone enabled. I met a problem.

 

In Non-Secure area, USB_DRD_FS->CNTR, USB_DRD_FS->CHEP0R can be set correctly.

 

In Secure area, I can set "USB_DRD_FS->CNTR = 0x9D00;".

But I can not set the "USB_DRD_FS->CHEP0R = 0x8280;". The register value remains at 0.

 

How can I use the USB peripheral in Secure area?

[FBL]

Hi @KMak 

Could you share a minimum project to reproduce? It's strange to see such an issue! 

 

You should be able to access secure mode without issues using LTDCUSBSEC in GTZC1_TZSC_SECCFGR2 

There might be an issue in configuring trust zone.