Jieli Br21 Driver Full =link= Jun 2026

bt_a2dp_set_sample_rate(44100); // must be called before start()

: Ensure that the module and its drivers are compatible with your target hardware and meet your project's performance requirements. jieli br21 driver full

Since Jieli Technology primarily sells chips to other manufacturers (like | hal_i2s_init() , hal_gpio_set() , hal_uart_write() | |

: Designed with power efficiency in mind, it helps in extending battery life in portable devices. battery‑level monitoring. | pmu_enter_sleep()

int main(void)

| Layer | Responsibilities | Typical API(s) | |-------|------------------|----------------| | | Direct register access, peripheral init/de‑init, interrupt routing. | hal_i2s_init() , hal_gpio_set() , hal_uart_write() | | BT Stack | Classic & LE link management, profile handling (A2DP, HFP, AVRCP, GATT). | bt_init() , bt_a2dp_start() , bt_le_connect() | | Audio DSP | Sample‑rate conversion, equalizer, ANC, echo‑cancellation, codec interfacing. | dsp_eq_set() , dsp_anc_enable() , dsp_process() | | BLE GATT | Service/characteristic registration, read/write callbacks, notifications. | ble_gatt_add_service() , ble_gatt_notify() | | Power Management | Sleep‑mode entry, wake‑up sources, battery‑level monitoring. | pmu_enter_sleep() , pmu_set_wakeup_source() | | RTOS Wrapper | Task creation, message queues, timers, mutexes. | os_thread_create() , os_queue_send() |