- English Version
- 例程难度：
本例程是 A2DP SINK 例程，使用经典蓝牙的 A2DP 协议进行音频流分发接收，使用 AVRCP 协议进行媒体信息通知控制。蓝牙音箱或者蓝牙耳机等应用可以用此示例作为基本功能参考。
A2DP SINK 的完整管道如下：
aadp_source ---> aadp_sink_stream ---> i2s_stream_writer ---> codec_chip ---> speaker本例程作为 A2DP 的 SINK 角色，需要和 A2DP SOURCE（一般可以是手机）配对连接，用来播放 A2DP SOURCE 下发的音频。
本例程支持的开发板在 $ADF_PATH/examples/README_CN.md 文档中例程与乐鑫音频开发板的兼容性表格中有标注，表格中标有绿色复选框的开发板均可运行本例程。请记住，如下面的 配置 一节所述，可以在 menuconfig 中选择开发板。
本例程支持 IDF release/v3.3 及以后的分支，例程默认使用 ADF 的內建分支 $ADF_PATH/esp-idf。
本例程默认选择的开发板是 ESP32-Lyrat V4.3，如果需要在其他的开发板上运行此例程，则需要在 menuconfig 中选择开发板的配置，例如选择 ESP32-Lyrat-Mini V1.1。
menuconfig > Audio HAL > ESP32-Lyrat-Mini V1.1
请先编译版本并烧录到开发板上，然后运行 monitor 工具来查看串口输出 (替换 PORT 为端口名称)：
idf.py -p PORT flash monitor
退出调试界面使用 Ctrl-]。
有关配置和使用 ESP-IDF 生成项目的完整步骤，请参阅 《ESP-IDF 编程指南》。
- 例程开始运行后，开发板等待用户的手机进行蓝牙连接操作，打印如下：
entry 0x400806f4
I (27) boot: ESP-IDF v4.2.2 2nd stage bootloader
I (27) boot: compile time 17:03:07
I (27) boot: chip revision: 3
I (30) boot_comm: chip revision: 3, min. bootloader chip revision: 0
I (37) boot.esp32: SPI Speed : 40MHz
I (42) boot.esp32: SPI Mode : DIO
I (46) boot.esp32: SPI Flash Size : 2MB
I (51) boot: Enabling RNG early entropy source...
I (56) boot: Partition Table:
I (60) boot: ## Label Usage Type ST Offset Length
I (67) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (75) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (82) boot: 2 factory factory app 00 00 00010000 00124f80
I (90) boot: End of partition table
I (94) boot_comm: chip revision: 3, min. application chip revision: 0
I (101) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x2c878 (182392) map
I (179) esp_image: segment 1: paddr=0x0003c8a0 vaddr=0x3ffbdb60 size=0x0344c ( 13388) load
I (185) esp_image: segment 2: paddr=0x0003fcf4 vaddr=0x40080000 size=0x00324 ( 804) load
0x40080000: _WindowOverflow4 at /hengyongchao/esp-idfs/esp-idf-v4.2.2/components/freertos/xtensa/xtensa_vectors.S:1730
I (186) esp_image: segment 3: paddr=0x00040020 vaddr=0x400d0020 size=0xae738 (714552) map
0x400d0020: _stext at ??:?
I (467) esp_image: segment 4: paddr=0x000ee760 vaddr=0x40080324 size=0x1701c ( 94236) load
0x40080324: _KernelExceptionVector at ??:?
I (521) boot: Loaded app from partition at offset 0x10000
I (521) boot: Disabling RNG early entropy source...
I (522) cpu_start: Pro cpu up.
I (525) cpu_start: Application information:
I (530) cpu_start: Project name: bt_sink_demo
I (535) cpu_start: App version: v2.2-201-g6fa02923
I (541) cpu_start: Compile time: Sep 30 2021 17:03:01
I (547) cpu_start: ELF file SHA256: 70fe532bd3fbc1b2...
I (553) cpu_start: ESP-IDF: v4.2.2
I (558) cpu_start: Starting app cpu, entry point is 0x40081a18
0x40081a18: call_start_cpu1 at /hengyongchao/esp-idfs/esp-idf-v4.2.2/components/esp32/cpu_start.c:287
I (0) cpu_start: App cpu up.
I (569) heap_init: Initializing. RAM available for dynamic allocation:
I (576) heap_init: At 3FFAFF10 len 000000F0 (0 KiB): DRAM
I (582) heap_init: At 3FFB6388 len 00001C78 (7 KiB): DRAM
I (588) heap_init: At 3FFB9A20 len 00004108 (16 KiB): DRAM
I (594) heap_init: At 3FFCF0E0 len 00010F20 (67 KiB): DRAM
I (600) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (606) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (613) heap_init: At 40097340 len 00008CC0 (35 KiB): IRAM
I (619) cpu_start: Pro cpu start user code
I (637) spi_flash: detected chip: gd
I (638) spi_flash: flash io: dio
W (638) spi_flash: Detected size(8192k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (648) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (695) BLUETOOTH_EXAMPLE: [ 1 ] Init Bluetooth
I (695) BTDM_INIT: BT controller compile version [ba56601]
I (695) system_api: Base MAC address is not set
I (695) system_api: read default base MAC address from EFUSE
I (705) phy_init: phy_version 4660,0162888,Dec 23 2020
I (1395) BLUETOOTH_EXAMPLE: [ 2 ] Start codec chip
I (1405) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1425) gpio: GPIO[21]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (1425) ES8388_DRIVER: init,out:02, in:00
I (1435) AUDIO_HAL: Codec mode is 2, Ctrl:1
I (1435) BLUETOOTH_EXAMPLE: [ 3 ] Create audio pipeline for playback
I (1435) BLUETOOTH_EXAMPLE: [4] Create i2s stream to write data to codec chip
I (1445) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (1455) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (1485) I2S: APLL: Req RATE: 44100, real rate: 44099.988, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 11289597.000, SCLK: 1411199.625000, diva: 1, divb: 0
I (1485) LYRAT_V4_3: I2S0, MCLK output by GPIO0
I (1495) BLUETOOTH_EXAMPLE: [4.1] Get Bluetooth stream
W (1495) BT_BTC: A2DP Enable with AVRC
I (1515) A2DP_STREAM: Unhandled A2DP event: 4
I (1515) BLUETOOTH_EXAMPLE: [4.2] Register all elements to audio pipeline
I (1515) BLUETOOTH_EXAMPLE: [4.3] Link it together [Bluetooth]-->bt_stream_reader-->i2s_stream_writer-->[codec_chip]
I (1535) AUDIO_PIPELINE: link el->rb, el:0x3ffd7c74, tag:bt, rb:0x3ffd80e0
I (1535) BLUETOOTH_EXAMPLE: [ 5 ] Initialize peripherals
E (1545) gpio: gpio_install_isr_service(438): GPIO isr service already installed
I (1555) gpio: GPIO[36]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1565) gpio: GPIO[39]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1575) BLUETOOTH_EXAMPLE: [ 5.1 ] Create and start input key service
I (1575) BLUETOOTH_EXAMPLE: [5.2] Create Bluetooth peripheral
W (1595) PERIPH_TOUCH: _touch_init
I (1595) BLUETOOTH_EXAMPLE: [5.3] Start all peripherals
I (1595) BLUETOOTH_EXAMPLE: [ 6 ] Set up event listener
I (1605) BLUETOOTH_EXAMPLE: [6.1] Listening event from all elements of pipeline
I (1615) BLUETOOTH_EXAMPLE: [ 7 ] Start audio_pipeline
I (1615) AUDIO_ELEMENT: [bt-0x3ffd7c74] Element task created
I (1635) AUDIO_ELEMENT: [i2s-0x3ffd5f10] Element task created
I (1635) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:133036 Bytes
I (1645) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_RESUME,state:1
I (1645) I2S_STREAM: AUDIO_STREAM_WRITER
I (1655) AUDIO_PIPELINE: Pipeline started
I (1655) BLUETOOTH_EXAMPLE: [ 8 ] Listen for all pipeline events- 用户使用手机蓝牙扫描，搜索到名为
ESP_SINK_STREAM_DEMO的蓝牙设备然后点击连接，打印如下：
E (265275) BT_APPL: bta_av_rc_create ACP handle exist for shdl:0
I (265285) A2DP_STREAM: A2DP bd address:, [14:60:cb:82:72:55]
I (265305) A2DP_STREAM: AVRC conn_state evt: state 1, [14:60:cb:82:72:55]
I (265455) A2DP_STREAM: A2DP audio stream configuration, codec type 0
I (265455) A2DP_STREAM: Bluetooth configured, sample rate=44100
I (265465) BLUETOOTH_EXAMPLE: [ * ] Receive music info from Bluetooth, sample_rates=44100, bits=16, ch=2
I (265495) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_PAUSE
I (265545) I2S: APLL: Req RATE: 44100, real rate: 44099.988, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 11289597.000, SCLK: 1411199.625000, diva: 1, divb: 0
I (265545) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_RESUME,state:4
I (265555) I2S_STREAM: AUDIO_STREAM_WRITER
I (265855) A2DP_STREAM: AVRC remote features 25b, CT features 2
W (265995) BT_APPL: new conn_srvc id:19, app_id:0
I (265995) A2DP_STREAM: A2DP bd address:, [14:60:cb:82:72:55]
I (265995) A2DP_STREAM: A2DP connection state = CONNECTED
I (266535) A2DP_STREAM: AVRC remote features 25b, CT features 2
I (266605) A2DP_STREAM: AVRC register event notification: 13, param: 0x0
I (266615) A2DP_STREAM: AVRC set absolute volume: 40%
I (266615) A2DP_STREAM: Volume is set by remote controller 40%- 蓝牙连接成功后，手机打开播放器，点击播放，那么开发板就会输出手机蓝牙下发的音频，打印如下：
I (294305) A2DP_STREAM: AVRC set absolute volume: 23%
I (294305) A2DP_STREAM: Volume is set by remote controller 23%
I (294335) BT_LOG: bta_av_link_role_ok hndl:x41 role:1 conn_audio:x1 bits:1 features:x824b
W (294335) BT_APPL: new conn_srvc id:19, app_id:1
I (315545) A2DP_STREAM: AVRC set absolute volume: 23%
I (315545) A2DP_STREAM: Volume is set by remote controller 23%
I (322135) A2DP_STREAM: AVRC set absolute volume: 23%
I (322135) A2DP_STREAM: Volume is set by remote controller 23%
I (327765) A2DP_STREAM: AVRC set absolute volume: 23%
I (327765) A2DP_STREAM: Volume is set by remote controller 23%- 本例程还支持 AVRCP 进行媒体播放操作控制，如音量加、音量减、下一曲、上一曲等，打印如下：
I (327765) A2DP_STREAM: AVRC set absolute volume: 23%
I (327765) A2DP_STREAM: Volume is set by remote controller 23%
I (330095) A2DP_STREAM: AVRC set absolute volume: 29%
I (330095) A2DP_STREAM: Volume is set by remote controller 29%
I (331115) A2DP_STREAM: AVRC set absolute volume: 36%
I (331115) A2DP_STREAM: Volume is set by remote controller 36%
I (332935) A2DP_STREAM: AVRC set absolute volume: 29%
I (332935) A2DP_STREAM: Volume is set by remote controller 29%
I (333695) A2DP_STREAM: AVRC set absolute volume: 23%
I (333695) A2DP_STREAM: Volume is set by remote controller 23%
I (337975) A2DP_STREAM: AVRC set absolute volume: 29%
I (337975) A2DP_STREAM: Volume is set by remote controller 29%
I (345145) A2DP_STREAM: AVRC set absolute volume: 62%
I (345145) A2DP_STREAM: Volume is set by remote controller 62%
I (345155) A2DP_STREAM: AVRC set absolute volume: 29%
I (345155) A2DP_STREAM: Volume is set by remote controller 29%以下为本例程的完整日志。
entry 0x400806f4
I (27) boot: ESP-IDF v4.2.2 2nd stage bootloader
I (27) boot: compile time 17:03:07
I (27) boot: chip revision: 3
I (30) boot_comm: chip revision: 3, min. bootloader chip revision: 0
I (37) boot.esp32: SPI Speed : 40MHz
I (42) boot.esp32: SPI Mode : DIO
I (46) boot.esp32: SPI Flash Size : 2MB
I (51) boot: Enabling RNG early entropy source...
I (56) boot: Partition Table:
I (60) boot: ## Label Usage Type ST Offset Length
I (67) boot: 0 nvs WiFi data 01 02 00009000 00006000
I (75) boot: 1 phy_init RF data 01 01 0000f000 00001000
I (82) boot: 2 factory factory app 00 00 00010000 00124f80
I (90) boot: End of partition table
I (94) boot_comm: chip revision: 3, min. application chip revision: 0
I (101) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x2c878 (182392) map
I (179) esp_image: segment 1: paddr=0x0003c8a0 vaddr=0x3ffbdb60 size=0x0344c ( 13388) load
I (185) esp_image: segment 2: paddr=0x0003fcf4 vaddr=0x40080000 size=0x00324 ( 804) load
0x40080000: _WindowOverflow4 at /hengyongchao/esp-idfs/esp-idf-v4.2.2/components/freertos/xtensa/xtensa_vectors.S:1730
I (186) esp_image: segment 3: paddr=0x00040020 vaddr=0x400d0020 size=0xae738 (714552) map
0x400d0020: _stext at ??:?
I (467) esp_image: segment 4: paddr=0x000ee760 vaddr=0x40080324 size=0x1701c ( 94236) load
0x40080324: _KernelExceptionVector at ??:?
I (521) boot: Loaded app from partition at offset 0x10000
I (521) boot: Disabling RNG early entropy source...
I (522) cpu_start: Pro cpu up.
I (525) cpu_start: Application information:
I (530) cpu_start: Project name: bt_sink_demo
I (535) cpu_start: App version: v2.2-201-g6fa02923
I (541) cpu_start: Compile time: Sep 30 2021 17:03:01
I (547) cpu_start: ELF file SHA256: 70fe532bd3fbc1b2...
I (553) cpu_start: ESP-IDF: v4.2.2
I (558) cpu_start: Starting app cpu, entry point is 0x40081a18
0x40081a18: call_start_cpu1 at /hengyongchao/esp-idfs/esp-idf-v4.2.2/components/esp32/cpu_start.c:287
I (0) cpu_start: App cpu up.
I (569) heap_init: Initializing. RAM available for dynamic allocation:
I (576) heap_init: At 3FFAFF10 len 000000F0 (0 KiB): DRAM
I (582) heap_init: At 3FFB6388 len 00001C78 (7 KiB): DRAM
I (588) heap_init: At 3FFB9A20 len 00004108 (16 KiB): DRAM
I (594) heap_init: At 3FFCF0E0 len 00010F20 (67 KiB): DRAM
I (600) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (606) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (613) heap_init: At 40097340 len 00008CC0 (35 KiB): IRAM
I (619) cpu_start: Pro cpu start user code
I (637) spi_flash: detected chip: gd
I (638) spi_flash: flash io: dio
W (638) spi_flash: Detected size(8192k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
I (648) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (695) BLUETOOTH_EXAMPLE: [ 1 ] Init Bluetooth
I (695) BTDM_INIT: BT controller compile version [ba56601]
I (695) system_api: Base MAC address is not set
I (695) system_api: read default base MAC address from EFUSE
I (705) phy_init: phy_version 4660,0162888,Dec 23 2020
I (1395) BLUETOOTH_EXAMPLE: [ 2 ] Start codec chip
I (1405) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1425) gpio: GPIO[21]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (1425) ES8388_DRIVER: init,out:02, in:00
I (1435) AUDIO_HAL: Codec mode is 2, Ctrl:1
I (1435) BLUETOOTH_EXAMPLE: [ 3 ] Create audio pipeline for playback
I (1435) BLUETOOTH_EXAMPLE: [4] Create i2s stream to write data to codec chip
I (1445) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (1455) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (1485) I2S: APLL: Req RATE: 44100, real rate: 44099.988, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 11289597.000, SCLK: 1411199.625000, diva: 1, divb: 0
I (1485) LYRAT_V4_3: I2S0, MCLK output by GPIO0
I (1495) BLUETOOTH_EXAMPLE: [4.1] Get Bluetooth stream
W (1495) BT_BTC: A2DP Enable with AVRC
I (1515) A2DP_STREAM: Unhandled A2DP event: 4
I (1515) BLUETOOTH_EXAMPLE: [4.2] Register all elements to audio pipeline
I (1515) BLUETOOTH_EXAMPLE: [4.3] Link it together [Bluetooth]-->bt_stream_reader-->i2s_stream_writer-->[codec_chip]
I (1535) AUDIO_PIPELINE: link el->rb, el:0x3ffd7c74, tag:bt, rb:0x3ffd80e0
I (1535) BLUETOOTH_EXAMPLE: [ 5 ] Initialize peripherals
E (1545) gpio: gpio_install_isr_service(438): GPIO isr service already installed
I (1555) gpio: GPIO[36]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1565) gpio: GPIO[39]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (1575) BLUETOOTH_EXAMPLE: [ 5.1 ] Create and start input key service
I (1575) BLUETOOTH_EXAMPLE: [5.2] Create Bluetooth peripheral
W (1595) PERIPH_TOUCH: _touch_init
I (1595) BLUETOOTH_EXAMPLE: [5.3] Start all peripherals
I (1595) BLUETOOTH_EXAMPLE: [ 6 ] Set up event listener
I (1605) BLUETOOTH_EXAMPLE: [6.1] Listening event from all elements of pipeline
I (1615) BLUETOOTH_EXAMPLE: [ 7 ] Start audio_pipeline
I (1615) AUDIO_ELEMENT: [bt-0x3ffd7c74] Element task created
I (1635) AUDIO_ELEMENT: [i2s-0x3ffd5f10] Element task created
I (1635) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:133036 Bytes
I (1645) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_RESUME,state:1
I (1645) I2S_STREAM: AUDIO_STREAM_WRITER
I (1655) AUDIO_PIPELINE: Pipeline started
I (1655) BLUETOOTH_EXAMPLE: [ 8 ] Listen for all pipeline events
E (265275) BT_APPL: bta_av_rc_create ACP handle exist for shdl:0
I (265285) A2DP_STREAM: A2DP bd address:, [14:60:cb:82:72:55]
I (265305) A2DP_STREAM: AVRC conn_state evt: state 1, [14:60:cb:82:72:55]
I (265455) A2DP_STREAM: A2DP audio stream configuration, codec type 0
I (265455) A2DP_STREAM: Bluetooth configured, sample rate=44100
I (265465) BLUETOOTH_EXAMPLE: [ * ] Receive music info from Bluetooth, sample_rates=44100, bits=16, ch=2
I (265495) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_PAUSE
I (265545) I2S: APLL: Req RATE: 44100, real rate: 44099.988, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 11289597.000, SCLK: 1411199.625000, diva: 1, divb: 0
I (265545) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_RESUME,state:4
I (265555) I2S_STREAM: AUDIO_STREAM_WRITER
I (265855) A2DP_STREAM: AVRC remote features 25b, CT features 2
W (265995) BT_APPL: new conn_srvc id:19, app_id:0
I (265995) A2DP_STREAM: A2DP bd address:, [14:60:cb:82:72:55]
I (265995) A2DP_STREAM: A2DP connection state = CONNECTED
I (266535) A2DP_STREAM: AVRC remote features 25b, CT features 2
I (266605) A2DP_STREAM: AVRC register event notification: 13, param: 0x0
I (266615) A2DP_STREAM: AVRC set absolute volume: 40%
I (266615) A2DP_STREAM: Volume is set by remote controller 40%
I (294305) A2DP_STREAM: AVRC set absolute volume: 23%
I (294305) A2DP_STREAM: Volume is set by remote controller 23%
I (294335) BT_LOG: bta_av_link_role_ok hndl:x41 role:1 conn_audio:x1 bits:1 features:x824b
W (294335) BT_APPL: new conn_srvc id:19, app_id:1
I (315545) A2DP_STREAM: AVRC set absolute volume: 23%
I (315545) A2DP_STREAM: Volume is set by remote controller 23%
I (322135) A2DP_STREAM: AVRC set absolute volume: 23%
I (322135) A2DP_STREAM: Volume is set by remote controller 23%
I (327765) A2DP_STREAM: AVRC set absolute volume: 23%
I (327765) A2DP_STREAM: Volume is set by remote controller 23%
I (330095) A2DP_STREAM: AVRC set absolute volume: 29%
I (330095) A2DP_STREAM: Volume is set by remote controller 29%
I (331115) A2DP_STREAM: AVRC set absolute volume: 36%
I (331115) A2DP_STREAM: Volume is set by remote controller 36%
I (332935) A2DP_STREAM: AVRC set absolute volume: 29%
I (332935) A2DP_STREAM: Volume is set by remote controller 29%
I (333695) A2DP_STREAM: AVRC set absolute volume: 23%
I (333695) A2DP_STREAM: Volume is set by remote controller 23%
I (337975) A2DP_STREAM: AVRC set absolute volume: 29%
I (337975) A2DP_STREAM: Volume is set by remote controller 29%
I (345145) A2DP_STREAM: AVRC set absolute volume: 62%
I (345145) A2DP_STREAM: Volume is set by remote controller 62%
I (345155) A2DP_STREAM: AVRC set absolute volume: 29%
I (345155) A2DP_STREAM: Volume is set by remote controller 29%- ESP32 A2DP 强制支持的音频编解码器是 SBC。SBC 数据流传输到 A2DP SINK，然后解码为 PCM 数据输出。PCM 数据格式通常为 44.1 kHz 采样率、双通道、16 位采样数据流。当然也支持 ESP32 A2DP SINK 中的其他解码器配置，但需要额外修改协议栈设置。
- ESP32 A2DP SINK 最多只能支持与一个远程 A2DP SOURCE 设备的连接。此外，A2DP SINK 不能与 A2DP SOURCE 同时使用，但可以与其他配置文件一起使用，例如 SPP 和 HFP。
请按照下面的链接获取技术支持：
- 技术支持参见 esp32.com 论坛
- 故障和新功能需求，请创建 GitHub issue
我们会尽快回复。