USB Audio Class with HAL Driver for STM32F103RC
main.c - Example of simple audio output using internal DAC
usb_audio.c - Code for USB and Audio Class
usb_audio_dscr.c - Definition of USB Descriptors
usb_pcd.c - Bridging HAL_PCD_xxCallback to functions in usb_audio.c.
USB VID/PID, Buffering size or others are defined in usb_audio_dscr.h