树莓派3 蓝牙的配置
参考网址：https://github.com/ev3dev/ev3dev/issues/198
http://blog.csdn.net/Aguangg_6655_la/article/details/54637165
https://wiki.archlinux.org/index.php/Bluetooth_headset#A2DP_via_Bluez5.2FPulseaudio
一、前言
说实话，配置树莓派3的蓝牙功能，简直配置的心力交瘁，查了无数资料，话不多说了
直接进去正题
二、蓝牙配置
1、先更新源，用阿里的源比较快
deb http://mirrors.aliyun.com/raspbian/raspbian/ jessie main contrib non-free rpi
sudo apt-get update
sudo apt-get updgrade -y
sudo apt-get dist-upgrade -y
2、安装依赖包
sudo apt-get install pi-bluetooth bluez bluez-firmware blueman
3、下载好后，将pi用户添加到蓝牙组
sudo usermod -G bluetooth -a pi
4、启动服务，重启树莓派
sudo systemctl start bluetooth
sudo reboot
三、蓝牙连接
1、开启蓝牙
sudo systemctl start bluetooth
2、配对某个设备（注意是root权限）
sudo bluetoothctl
[bluetooth]# scan on
[bluetooth]# agent on
[bluetooth]# trust xx:xx:xx:xx:xx:xx
[bluetooth]# pair xx:xx:xx:xx:xx:xx
[bluetooth]# connect xx:xx:xx:xx:xx
3、查看蓝牙工作状态
systemctl status bluetooth
4、如果能成功连接，如果不能，请看第四部分
四、异常处理，这才是关键
以下未经说明都是以root权限运行
1、查看异常一定要记住查看日志
查看系统日志： journalctl -n 20
里面记录了出现了何种异常
2、先按照我认为能让蓝牙工作的流程配置一下
1）安装相关模块：
apt-get install --no-install-recommends pulseaudio pulseaudio-module-bluetooth
2）下载2个配置文件：
https://gist.github.com/dlech/7e9d28bccac9632cbc50#file-pulseaudio-service
3）配置配置文件
cp pulseaudio.service /etc/systemd/system/
systemctl daemon-reload
cp pulseaudio-bluetooth.conf /etc/dbus-1/system.d/
4）修改相关配置文件
打开配置文件，最下面行加入：
vim /etc/pulse/system.pa
### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif
.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif
5）将root 和 pi 加入 audio pulse-access 族
usermod -a -G pulse-access,audio root
usermod -a -G pulse-access,audio pi
6）启动服务：systemctl start pulseaudio.service
7)查看系统日志，是否有异常
(1)、出现下面这些错误，忽略
pulseaudio[18912]: E: [pulseaudio] bluez4-util.c: org.bluez.Manager.GetProperties() failed: org.freedesktop.DBus.Error.UnknownMethod: Method "GetProperties"
xcb_connection_has_error() returned true
8）登录pulse
su -s /bin/bash pulse
pactl list | grep Card
如果只连接一个蓝牙设备，标签1就是，看具体情况
Card #1
Name: bluez_card.00_17_E7_BD_1C_8E
Driver: module-bluez5-device.c
Owner Module: 14
Properties:
device.description = "BlueZ 5.23"
device.string = "00:17:E7:BD:1C:8E"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
bluez.path = "/org/bluez/hci0/dev_00_17_E7_BD_1C_8E"
bluez.class = "0x0c0000"
bluez.alias = "BlueZ 5.23"
device.icon_name = "audio-card-bluetooth"
Profiles:
a2dp_source: High Fidelity Capture (A2DP Source) (sinks: 0, sources: 1, priority: 10, available: yes)
a2dp: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 10, available: yes)
off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
Active Profile: a2dp
Ports:
unknown-output: Bluetooth Output (priority: 0, latency offset: 0 usec)
Part of profile(s): a2dp
unknown-input: Bluetooth Input (priority: 0, latency offset: 0 usec)
Part of profile(s): a2dp_source
9）、将蓝牙设备设置为a2dp模式
pactl set-card-profile 1 a2dp
10）可以用mplayer 播放音乐测试了
（1）、播放音乐
（2）、win远程桌面->sound -> pulseAudio ->fallback -> audio stream ->蓝牙设备
11）查看系统日志，如果出现其他的异常，自己百度吧