Only DFU is recognized, not CDC on F070CB

[Davorin]

Good afternoon

Received my first own PCB back with a STM32F070CB chip...

When I pull the Boot0 pin high, I see that the host PC sees it as a DFU device...

But under normal condition when using the CDC class I see following message on the host:

[17770.689967] usb 7-2.4.4: new full-speed USB device number 31 using xhci_hcd
[17770.690061] usb 7-2.4.4: Device not responding to setup address.
[17770.898063] usb 7-2.4.4: Device not responding to setup address.
[17771.105939] usb 7-2.4.4: device not accepting address 31, error -71

I assume this has something to do with HSE as DFU mode always use internal oscillator?

How can I verify that the HSE is working?

When I just a LED blinking code in main() this works fine, regardless is choosing external or internal HS oscillator...

Or maybe something else broken in my hardware?

thanks in advance

richard

[Davorin]

Odd...works suddenly now....switched to internal LS oscillator....