2. SDK分析

1. 概述

恒玄bes2700 sdk属于恒玄面向耳机市场的sdk，主要参考《BES_TWS_Software_Development_User_Manual_v1.2.pdf》

SDK由恒玄提供，版本《best1603_ibrt_anc_20240124_207ba3fb90.tar》

- “apps” mainly stores upper-layer application-related software.

- “config” indicates the basic differentiated configuration.

- “Documentations” contains SDK related basic documents.

- “include” mainly contains RTOS header files.

- “lib” indicates BES owned libraries.

- “mbed” indicates mbed configuration files.

- “out” stores the compiled output file, select the “.bin” file when programming.

- “platform” mainly contains Driver codes and CMSIS codes.

- “rtos” indicates RTOS source files.

- “scripts” contains building framework scripts.

- “services” indicates service codes.

- “tests” contains test programs.

- “thirdparty” indicates third-party libraries.

- “utils” contains common utility codes.

- “Makefile” indicates the entry of the Makefile

核心	内核	性能
Main MCU	STAR-MC1	32-bit 内核 Armv8-M， Mainline 4.02 CoreMark/MHz
Co-processor	Hifi4 DSP
Co-processor	M55	Cortex-M55内核，基于Armv8.1-M架构
Sensor hub	STAR-MC1
Bluetooth controller	STAR-MC1

Task name	Description
app_audio_thread	Manages different types of audio streams.
app_thread	Mainly used for the processing messages from the application modules.
af_thread	Processes the audio flinger dma irq events, covering internal codec, i2s, tdm, spdif, bt pcm functionalities. This is audio thread where the audio algorithms are running.
BesbtThread	Used for running all of the classic BT and BLE host layers.
main_thread	The main thread of the SDK.
a2dp_decoder_cc_processor_thread	Communicates with M55 for A2DP music decoding
app_custom_ux_thread	Distributes the TWS UI owned bluetooth events to the custom project for implementing the custom UI.
app_dsp_m55_bridge_rx_thread	Processes the core bridge message between main MCU and m55
app_prompt_handler_thread	Processes the pending prompt playing requests in the queue one by one.
app_core_bridge_rx_thread	Processes the core bridge message between main MCU and sensor hub.