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STM32 U5A5 USB CDC - PCD driver- sometimes not opening enumeration port and not sending any data

Ab31
Associate

‎2025-03-12 6:02 AM

I have used following

Projects/NUCLEO-H563ZI/Applications/USB_Device/CDC_Standalone/USB_Device library.

for STM32U575 Series controller (USB OTG FS) which is easily enumerated and running data at 1 mbps speed with good stability.

 

But same library I used for "NUCLEO-U5A5",  (USB OTG HS) , configured clock and PHY for OTG HS - which is getting enumerated successfully also but not stable , and sometimes getting disconnected and PCD_IRQ is not triggering sometimes.  

Is OTG_HS has something different or missing something or core difference , when compared to OTG_FS used in stm32u575 ? kindly guide.

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FBL
ST Employee

‎2025-03-24 5:56 AM - edited ‎2025-03-24 5:57 AM

Hi @Ab31 
Check your clock source. Ensure the external HSE oscillator is correctly connected and configured.

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