STM32F103C8T6 USB sanity check

[JFren.1]

Hi All, sanity check sought:

I'm using the blue pill (STM32F103C8T6) for a audio project powered & controlled through the serial/USB.

I'm using the STM32 cube and a dev board for the s/w which looks ok; in terms of software I've followed https://controllerstech.com/send-and-receive-data-to-pc-without-uart-stm32-usb-com/ and that works ok.

 

My concern is with the serial -  assuming the above s/w process outlined in the link, is this everything I need for USB communications hardware wise? Or in general anything I'm missing? For instance:
*I've seen resistors on the D+ and D- lines in previous designs, though I'm not sure is these are needed

*I'm using the MIC29302WU as I've quite high current demands from the USB (<500mA) to drive a speaker (this explains the LDO's presence / the requirements)

*Can the VBAT pin be left unconnected or does it need a pullup/down? even if not used

*Boot0 and 1 tied low ok? I'll be using the SWD to flash and won't need to debug/program through the USB

*20pF ok?

 

 

[TDK]

A pullup on DP is required on the STM32F103.

*Introduction to USB hardware and PCB guidelines using STM32 MCUs - Application note

> Can the VBAT pin be left unconnected or does it need a pullup/down? even if not used

 If no external battery is used in the application, it is highly recommended to connect VBAT
externally to VDD.

Getting started with STM32F10xxx hardware development - undefined

> Boot0 and 1 tied low ok? I'll be using the SWD to flash and won't need to debug/program through the USB

Yes.