I tried to replicate the usb part of NUCLEO-F439ZI dev board to a project, without success.

[FabioVasconcelos]

I'm using vbus to power supply the MCU, through a voltage regulator.

For the MCU I'm using the stm32f427, not the 39, as in the development board, but they seemed compatible with my project features.

When I connect the board to my laptop via USB, the overcurrent led turns on, and my operating system (ubuntu) does not detect any new USB device.

If I connect boot0 to VCC, the command lsusb in ubuntu takes some seconds to respond.

Can you please give me some suggestions?

Thank you in advance

[MM..1]

Ok try this order

1. Unconnect all power and cables from your board
2. Cannect jumper BOOT0 high
3. Connect USB cable between PC USB 2 port and board with ok data cable
4. Power on your board
5. Check on PC device manager new device

On PC you need preinstall STMCubeProgrammer as step 0

If device isnt found check if syste is in bootloader , but detect other interface

or MCU fail other way.

[Chris1]

Is there actually nothing connected to the VCAP pins as it appears above?

That would be a problem...

[FabioVasconcelos]

Can you download the videos and see them if you don't mind?

I did what you asked without success

https://we.tl/t-tDoW5OO07B

[FabioVasconcelos]

Here is what you asked for me. You can see in the first run that a blinking program is running, then I did what you asked, and you can see the results:

Link: https://we.tl/t-uJiwNahH2Q

[FabioVasconcelos]

Thank you, I will give it a try and let you know the result!

[Chris1]

[FabioVasconcelos]

It seems that I'm missing VCAPS and PDR_ON, I will try both!! Thank you

PVD I didn't understand what they mean, maybe does not exist in stm32f427?

[Chris1]

If you have not enabled the PVD, I don't think that it is of concern.

[FabioVasconcelos]

I figured it out.

I'm missing a crystal in PH0 and PH1, not it's working!

Thank you all!