Central Project

[中文]

1 Function Overview

This project show how pad work with main function: bluetooth a2dp source/avrcp tg ct/ble

2 Code Path

demo:./projects/bluetooth/central

build cmd:make bk7258 PROJECT=bluetooth/central

2 project path

• central: project/bluetooth/central

3 a2dp source cli introduce

a2dp_player connect <xx:xx:xx:xx:xx:xx>	connect to soundbar
a2dp_player disconnect <xx:xx:xx:xx:xx:xx>	disconnect
a2dp_player play <xxx.mp3>	play mp3
a2dp_player stop	stop play
a2dp_player pause	pause
a2dp_player resume	resume
a2dp_player abs_vol <xxx>	set remote absolute volume 0 ~ 127 (depend on peer impl)

4 a2dp source test procedure

1.Find a sdcard format exfat, copy project/bluetooth/central/1_qcs.mp3 to root dir. (Must be 16bits mp3)

2.Insert sdcard and power on.

3.Make soundbar enter pair mode.

4.Input a2dp_player connect xx:xx:xx:xx:xx:xx (xx means soundbar addr).

5.Input a2dp_player play xxx.mp3

6.Now you can here soundbar playing music.(You should play after connection complete as soon as possible, and don’t stop, ref chapter 5)

7.You can stop or pause when play, play when stop.

5 compatibility describes

1.In music playing scenario, some soundbars(e.g. JBL) would disconnect(JBL would power up bluetooth) link when stop(local a2dp_player stop or peer avdtp suspend) too long. log will show “bt_api_event_cb:Disconnected from xx:xx:xx:xx:xx:xx”

2.Some soundbars(e.g. xiaomi) would not register avrcp playback and could express inconformitily status between local and peer.

3.Some soundbars(e.g. xiaomi) would not report avrcp volume changed evt, so central could not know. | 4.Some soundbars(e.g. xiaomi) does not support absolute volume.

6 Attention

1.Log would show “f_mount failed” or “read data crc error” when sdcard failed.