Linux/WL1837MODCOM8I: Audio Distorted Over HCI interface

Hi , We have assigned your query to relevant expert. We will get back to you shortly .

Thanks
Saurabh

I do not think, HS/HF profile is supported by Bluez5. How are you ensuring that the connection to the headset is done through HS/HF? It is likely that Bluez has connected to the headset through a2dp?

TI recommends using Blutopia stack for better support of these profiles (processors.wiki.ti.com/index.php )

Thanks

Hello,

HS/HF is supported in combination with bluez5 + pulseaudio [1].

$> pactl list cards

Card #2
Name: bluez_card.05_43_54_48_C3_C8
Driver: module-bluez5-device.c
Owner Module: 23
Properties:
device.description = "X7"
device.string = "05:43:54:48:C3:C8"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
device.form_factor = "headset"
bluez.path = "/org/bluez/hci0/dev_05_43_54_48_C3_C8"
bluez.class = "0x240404"
bluez.alias = "X7"
device.icon_name = "audio-headset-bluetooth"
device.intended_roles = "phone"
Profiles:
headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, sources: 1, priority: 20, available: yes)
a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 10, available: no)
off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
Active Profile: headset_head_unit
Ports:
headset-output: Headset (priority: 0, latency offset: 0 usec)
Part of profile(s): headset_head_unit, a2dp_sink
headset-input: Headset (priority: 0, latency offset: 0 usec)
Part of profile(s): headset_head_unit


So here the current active profile is headset_head_unit.

[1] www.freedesktop.org/.../

Thanks,
Mike

Also to add HF/HS profile are over PCM by default, to route them over UART following command is used "hcitool cmd 0x3F 0x0210 0x01 120 511 0xFF"

In this demo [1] is data captured via mcasp ? As I dont see any command for arecord.

[1] processors.wiki.ti.com/index.php

Thanks,
Mike

I suppose, you have 'oFono' installed.. See this statement from pulse audio release :
"PulseAudio depends on BlueZ for all Bluetooth functionality, and additionally oFono is required for HFP support"

As, such your VS command to route SCO packets HCI seems Ok.
Can, you capture 'btssnoop' logs when in HFP with hcidump i.e in btssnoop format? Also, if you have BT sniffer, please collect sniff logs to analyze further.

Hi Hari,

Yes I have bluez5 + pulseaudio + ofono which in combination supports HFP support.

I have attached the log in btsnop format. Fyi btsnoop is now part of btmon and not hcidump command.

btsnoop.txt

Thanks,

Mike

Mike, We are not able to open the btsnoop log file. What is the stored format? We, tried to open with FT's Comscope.

Thanks

Hi,

I used btmon command to save the traces in btsnoop format :

btmon --write btsnoop.txt

Is there any alternative tool to get btsnoop dump ?

Thanks,
Mike

Hi Prabhakar,

Thanks Ill try this and update you. Is it possible to get stereo as well.

Thanks,
Mike