to a computer to capture audio for podcasts or music production. Bluetooth Transmitters
| 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. | jieli br21 driver full
my_br21_project/ ├─ src/ │ ├─ main.c // entry point, RTOS init │ ├─ app_audio.c // audio pipeline glue │ └─ app_ble.c // BLE service implementation ├─ inc/ │ └─ app_cfg.h // compile‑time options ├─ Makefile / CMakeLists.txt └─ jieli_sdk/ // symbolic link to $JIELI_SDK_ROOT Introduction to a computer to capture audio for
The devices should automatically link without software intervention. | | Development Kit | Jieli BR21‑DK (or