This is my first question, I really hope you can help.
I soldered a STM32F401RC on my custom board and I connected it to a mini-usb plug. In particular, I connected PA9 to Vbus, PA11 (configured as USB_OTG_FS_DM) to D- , PA12 (configured as USB_OTG_FS_DP) to D+, VSS to GND.
The USB doesn't work. Windows says "Unrecognized device" and the Vbus voltage is 1V instead of 5V.
What is wrong?
Thank you in advance.