Calling issue using bluetooth on the i.MX8QUADMAX board with Murata 1cx module

[Arvi]

Hi,

I have been trying to connect phone on the i.MX8QM development board with Bluetooth module Cypress CYW4356. My phone is connected to the board and i am able access the caller app. Using i made a call to another device and calling is done. But no audio is getting in both devices, which i guess some issues in routing call from the board. The board is connected with a speaker system and we can able able play a music from phone via Bluetooth using an app (media player). I don't think Bluetooth has any issue. Could you suggest a method so that i can able to use Bluetooth for telephonic purpose. Thank you.

Regards,

Aravind.

[IvanRuiz]

Hello,

If the board is able to play audio from BT then the problem might be on the call app, because:

*Audio on the board working (Possible)

*Send audio over Bluetooth (Possible)

Please try to use another app for the call.

BR,

Ivan.

[Arvi]

First of all sorry, there is a misunderstanding in defining the Audio issue. Actually if we connect our mobile device with i.MX8 Board using Bluetooth, it's not transferring any audio sources including media sources like music, Video. If we play music, it suddenly gets paused. Same for video also but if we call, the connection gets established. But still audio is not working. But from the i.MX8 Board if we play music that is in its memory using a media player then it comes out from the speaker connected. Thank you.

[IvanRuiz]

Hello,

Then the problem seems to be in the BT module. You may find it helpful to refer to the following document from Murata, chapter 7.2 for testing/verifying of BT interface: https://wireless.murata.com/pub/RFM/data/murata_quick_start_guide_linux.pdf

Hope it helps you find the problem!

BR,

Ivan.

[Arvi]

Hi,

As you suggested i tested and verified the Bluetooth module and found its working perfectly. From i.MX side i am getting some failure and error. I am attaching the logfile for bluetooth call. I made some edit in audio_policy_configuration.xml file in-order to enable audio devices. I am sending logfiles with and without xml edits. telephony_call.txt is logfile with edit in audio_policy_configuration.xml. Please find the attachments. Thank you.

Regards,

Aravind.

[Arvi]

Hi,

I found the audio_policy_configuration.xml from my i.MX8QMMEK board. From my understanding its required to add every device ports and routes of every audio devices in that .xml file in order to enable the audio devices.

But in my audio_policy_configuration.xml file the device ports, sink and source details are not added for telephone call audio sources. AUDIO_DEVICE_OUT_TELEPHONY_TX and AUDIO_DEVICE_IN_TELEPHONY_RX are missing.

I am attaching the file for your reference. So i want to know whether this is the reason why am not getting the audio while calling through Bluetooth. Thank you.

Regards,

Aravind.

[Arvi]

Hi,

Please find the Bluetooth HCI snoop log attached for your reference.

Regards,

Aravind.