: For developers, Jieli provides a USB Dongle 4.0 Update Tool and manual for upgrading firmware on BR21 and related chips (BR17, BR18, BR20, BR22). Download Resources
In many cases, Windows 10/11 will automatically download the correct audio driver if you select "Update Driver" in Device Manager. Installation Steps (Full Driver) jieli br21 driver full
hal_init(); // clocks, pins, UART for debug pmu_init(); // battery monitor, sleep config bt_init(); // classic + BLE stack dsp_init(); // allocate buffers, load default EQ ble_gatt_init(); // register custom services : For developers, Jieli provides a USB Dongle 4