Not able to see the STM32H730 USB virtual port number under "ports" of the Device manager in Windows.

[Skuma.12]

In debug mode able to see the com port number in device manager under ports, Once debugging mode is terminated unable to find the Virtual comport in Device manager. What could be the problem, is any configurations missed ?

MPU: STM32H730VBT6

IDE: STM CubeMX IDE 1.4.0

How to solve the above problem. I am using HAL layer

Thanks in advance

Regards,

Sudheer

[Tesla DeLorean]

Custom board?

Have you left BOOT0 floating,or pulled high?

[Skuma.12]

Hi Tesla,

Thanks for your response.

It's a In-house Cutom board and BOOT0 pin is at Rest state.

What should be the state of this pin to detecting Virtual port.

Please see the attached picture for BOOT0 pin status

Thanks & Regards,

Sudheer

[Paul1]

Try driving BOOT0 low (On our boards we tie it low, some are STM32H7xx).

In MX may be able to enable a pulldown on BOOT0 pin.

*If uncertain about a pin put places for Pullup and Pulldown resistors on PCB, then can populate later after testing. Leaving input pins floating invites RF noise to randomly change the pin's state, which means it could behave very different "in the field" compared to bench testing.

Paul

[Skuma.12]

Hi Paul,

Have a nice day!

Thanks for your Answer. I will ground the pin and check it.

Regards,

Sudheer

[TDK]

BOOT0 should never be left floating. Pull it down to GND if you want user code to be ran at startup. There is no internal pulldown so an external resistor is required, or tie it directly to GND.

[Skuma.12]

Hi TDK,

Good Morning!

I will change the pin status as you said and check it.

Regards,

Sudheer