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Problems with USB device stack (VCP)

Question asked by Legrand.Thomas.001 on Oct 25, 2011
Latest reply on Nov 24, 2011 by Legrand.Thomas.001

First I4m working on my own board, a product almost final on which I added USB. MCU is STM32F205RE and "of course" I used the HS USB port (using embedded PHY).

Now I'm trying to get it working and it is VERY twitchy ... first if I plug or unplug the USB cable while powered up => hard fault (did not check yet exactly why).

Then even if I start with USB cable, 90% of the time windows says the USB peripheral is unknown/did not work, and 10% of the time the driver installation starts with the right descriptor strings, fails and the device appear in the device manager with a yellow icon and error code 10 (device can't start).

My MicroB USB connector is directly connected to PB13 (VBUS), PB14 (DM) and PB15 (DP). VBUS is only for sensing and never for powering the board.

Any idea ?