Skip to main content
PWind.1
Associate
Aug 6, 2020 12:25 PM UTC
Solved

STM32L4 CDC not working under Windows 10.

Have implemented Virtual Comm port on STM32L4. Works fine under Linux but Windows 10 shows Device Descriptor Request Failed.

Suggestions please.

Thanks

This topic has been closed for replies.
Jeff Tenney
Jeff TenneyBest answer
Senior
Aug 6, 2020 3:17 PM UTC

3 replies

PWind.1
PWind.1Author
Associate
Aug 6, 2020 2:59 PM UTC

After upping the system frequency to 32MHz now works fine under Linux and Windows.

Can anyone explain?

Jeff Tenney
Jeff TenneyBest answer
Senior
Aug 6, 2020 3:17 PM UTC
PWind.1
PWind.1Author
Associate
Aug 6, 2020 3:53 PM UTC

You star!

Thanks for thank - would explain why a frequency increase worked. Still not sure why Linux liked it and not Windows, but then that's Windows for you!

Phil