An open-source audio streaming bridge compatible with USB Audio 2.0 specification
- Full USB 2.0 HS support
- Asynchronous feedback
- Very low cost: no external programmable logic required
- Easy interfacing with DACs
- PCM supports: 44.1k, 48k, 88.2k, 96k, 176.4k, 192k, 352.8k, 384k,
705.6k, 768k(Not tested). DoP supports: DSD64, DSD128, DSD256(Stability issue, to be fixed)
- DSD native is unsupported due to driver
- Manual reset may be required after reconnecting USB cable
For details of ST's USB device library, please refer to UM1734
These files contain the main work of this project
- audio_desc.c: USB configuration descriptor
- usbd_audio.c: USB interrupt callbacks
- audio_buffer.c: Circular buffer
- usbd_audio_if.c: Peripheral and external DAC interface
There is currently a bug in CubeMX: when using LL for RCC, the PLLCFGR is not configured correctly. A workaround is manually
add RCC->PLLCFGR |= 1 << 16; before LL_RCC_PLL_Enable(); after each code regeneration.