: For firmware-level modifications, Jieli provides the JL USB Dongle 4.0 Update Tool , used by manufacturers to upgrade chips like the BR17, BR21, and BR22. Technical Specifications Feature Chip Type 32-bit DSP Bluetooth Audio IC Bluetooth Version Compliant with Bluetooth V5.0+BR+EDR Audio Interface 16-bit Stereo DAC with headphone amp, SNR ≥is greater than or equal to 95dB Connectivity USB 2.0 OTG controller, UART, SPI, and IIC support USB Enum
In the context of Jieli Technology’s development environment, a "full driver" package is a misnomer for what is essentially a full Software Development Kit (SDK). Unlike standard PC peripherals where a driver facilitates communication between an operating system and a device, the BR21 driver package includes the source code and libraries required to program the chip itself. This includes the Bluetooth stack, audio processing algorithms, and peripheral drivers for GPIO (General Purpose Input/Output), UART (Universal Asynchronous Receiver-Transmitter), and I2S (Inter-IC Sound). A complete driver suite enables developers to customize the device's behavior, such as tuning the equalizer (EQ), implementing noise reduction, or managing battery charging protocols. 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 firmware-level modifications, Jieli provides the JL
| Item | Description | |------|-------------| | | Jieli BR21 – a dual‑core Bluetooth 5.0/5.1 audio System‑on‑Chip (SoC) targeted at true‑wireless earbuds, headphones, and portable speakers. | | Key Blocks | • ARM Cortex‑M0 (control core) • ARM Cortex‑M4 (DSP/audio core) • Bluetooth Baseband & RF (LE, Classic, A2DP, HFP, BLE) • Integrated DAC/ADC (24‑bit, up to 96 kHz) • Power Management Unit (PMU) • I²S, PDM, PCM, USB‑OTG, UART, SPI, I²C, GPIO, PWM | | Typical Use‑Case | Audio streaming (A2DP), voice calls (HFP), BLE custom services (e.g., OTA, sensor data), active noise cancellation (ANC) or passive audio processing. | | Development Kit | Jieli BR21‑DK (or third‑party “Jieli‑DemoBoard”) – includes a USB‑UART bridge, 3.5 mm audio jack, and a 4‑cell Li‑ion charger circuit. | | Software Stack | • Jieli SDK (C‑language, FreeRTOS‑based) • BT Stack (HCI + L2CAP + AVDTP + HFP) • Audio DSP (fixed‑point library, FIR/IIR, ANC, EQ) • BLE GATT (custom services) • HAL (GPIO, I²C, SPI, USB, PWM) | | License | Jieli SDK is provided under a proprietary non‑commercial license for evaluation; commercial customers receive a per‑device royalty‑free license after NDA. | | | Key Blocks | • ARM Cortex‑M0