cpu/br21/board/ : Contains board-specific configurations, pin mappings, and peripheral initializations.
I can confirm this works with Ubuntu 22.04. Using at terminal lsusb lists as: "ID 4c4a:4155 Jieli Technology USB Composite Device" Ask Ubuntu Jieli BR21 Bluetooth dongle shown as storage device
: On modern operating systems like Windows 10 and Ubuntu, the BR21 is automatically recognized as a "USB Composite Device" or "JieLi BR21" audio endpoint. jieli br21 driver exclusive
: You can find technical documentation and manufacturer details on the Zhuhai JieLi Technology official site .
The open-source project br21-linux has reverse-engineered the protocol. Use git clone https://github.com/opensource-audio/br21-dkms and compile the DKMS module. Fix (macOS): No official driver exists. However, using the dongle in "Class Compliance mode" (hold the pairing button for 10 seconds during power-on) allows macOS to treat it as a standard audio device, albeit without exclusive features. : You can find technical documentation and manufacturer
Visit the support page of your audio device manufacturer. Search for "BR21 Exclusive Driver." Look for a file named Jieli_BR21_Exclusive_Driver_v2.3.1.exe (version numbers may vary).
What (adapter, headset, speaker) uses this chip? Share public link Fix (macOS): No official driver exists
If it contains raw driver files ( .inf , .sys , .cat ), follow these manual steps: Plug your Jieli BR21 device into a USB port.
You will find the BR21 inside generic Bluetooth USB dongles, wireless car FM transmitters, budget wireless headphones, and Bluetooth-to-3.5mm auxiliary adapters. Why Do You Need the "Exclusive" Driver?
Open the exclusive Jieli configuration utility and increase the buffer size slightly (from 64 samples to 128 or 256 samples). Alternatively, turn off any third-party spatial sound enhancements like Windows Sonic or Dolby Atmos, which can conflict with Jieli's internal DSP. Issue: Driver Signature Verification Errors (Windows 10/11)