STM32WBA65 USB for debug

[SLevi.1]

I want to use a USB connection on a STM32WBA65 processor, purely for debug purposes to get some info back to a PC on a virtual com port. The device will not be powered by USB.

I don't want the processor to act as a host.

Questions:

1. Can the STM32WBA65 provide this implementation of a virtual com port? How is this set up in the HAL?
2. If I use a USB micro connector, which pins should be connected to where? In the past, on simpler STM32 devices, I have just connected ground, DP & DM from the cable directly into the micro.
3. If I use a USB-C connector, because they are generally more sturdy, which pins need connecting? Do I need to connect CC pins? Can I just pull them up (or down) with simple resistors?

[FBL · Accepted solution]

Hi @SLevi.1 

STM32WBA65 integrates a USB HS peripheral.

• It can be configured as a USB device CDC class to emulate a serial port over USB.
• This is commonly used for debug or communication purposes with a PC.

You can check this example. You can refer to CAD resources.

If you are using USB type C only ( without power delivery), you need to connect CC1 and CC2 pins each to ground via 5.1 kΩ pull-down resistors (required for USB-C device detection).