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Bluetooth audio in AM335xevm_sk kit

SANGILI KUMAR
Genius 3920 points
Other Parts Discussed in Thread: WL1271

Hi,

      In am335xevm_sk board schematic Bluetooth audio connected with MCASP0. But in board file there is no initialization part for MCASP0. 

     In SK board Bluetooth audio will work or not?  

  • 0
    TI__Expert 7220 points

    HI Sangili Kumar,

    We have added bluetooth HFP audio over mcasp for AM335xEVM only. Similar changes can be done for AM335x SK and get it work.

    Patches in reverse order

    92387a2: sound : mcasp: specify McASP sync or async operation mode

    ba9869b: am335x: sound-soc-davinci: make sure transmitter is stoped before restarting.

    fe6f9ec: am335x:sound-soc:initialize sysclk variable to appropriate value

    96790f7: am335xevm: davinci-mcasp: remove unwanted logs

    429a506: am335xevm: davinci-mcasp: Set one bit delay only for slave mode configuration

    ad1f8db: am335x: sound-soc-davinci:Remove trasmit state machine reset from rx sequence.

    ef13089: am335x: sound-soc-davinci: Correct configuration for ASYNC mode operation

    7d64ec6: am335x:android_defconfig: Enable WL1271 BT PCM driver

    3875c8d: am335x: sound-davinci: Added 1 bit delay for rx channel,for BT record

    1ba3b64: am335x: Add pin mux configuration & wl1271bt_codec_device platform data for macasp0

    f53486d: sound-soc-davinci: Create macasp<->bt-pcm interface

    eb2a4dd: McASP: Add support for McASP master mode

    6acf831: sound-soc: Dummy BT PCM driver for wl12xx

    Regards,

    Arun

  • 0 in reply to Arun Joseph
    Genius 3920 points

    Hi Arun,

          Before try this patches i just tried the Bluetooth audio paring with my Laptop. 

         AM335xevm_sk pairing with my laptop in A2DP mode and its playing the audio from laptop by SK kit. Regarding that i've following questions,

    1. What else your above mentioned patch do other than A2DP audio?

    2. In board-am335xevm.c there is no initialization part for Bluetooth audio (MCASP) but audio is working, so            processor transfering the audio via UART or MCASP to Bluetooth module?

    3. Above mentioned  Bluetooth HFP audio patches support GSM call mode?

    I've probed the MCASP pins on voltage translator while playing the audio but there is no proper clock. 

    Could you please clarify me?

  • 0 in reply to SANGILI KUMAR
    TI__Expert 7220 points

    Hello SangiliKumar,

    ON AM335xEVM two different BLUETOOTH audio profiles are supported.

    1. A2DP

    This profile is intended for Music PlayBack and Android will route the Audio over Bluetooth even before it reaches Audio HAL

    2. HFP/HSP

    This profile is for 8KHz voice ie Calls.. Android routes this type of Audio to Audio HAL and then to McASP. McASP channel will be connected to bluetooth chip. We have a dummy sound driver for this connection.

    To answer your questions.

    1) The patches are for HFP/HSP Bluetooth profile. A2DP works without these patches.

    2) The patches are only applied for AM335xEVM, similar configuration would be required for AM335x SK.

    3) Yes

    We have tested HFP from command line using tinyplay selecting the HFP hw device.

    Please let me know if you need any further clarification.

    Regards,

    Arun

  • 0 in reply to Arun Joseph
    Genius 3920 points

    Hi Arun,

    Yeah, you are right i'm aware of HFP profile for GSM call. 

    Actually my problem is i need to talk GSM call from Bluetooth headset but unfortunately AM335x have just 2 number of MCASP so we can't connect 3 audio devices (BT, GSM Modem, Audio codec) hence we tried the below mentioned audio routing. 

    In this case if i happen to have GSM call over Bluetooth headset i need to do bypass the signal two times, these are one is inside the AIC3262 second one is inside the AM335x. 

    Is this possible or is there any other method to connect these 3 audio devices ?

    Please let me know if any, and check the detailed explanation of my problem in below mentioned  post

    http://e2e.ti.com/support/data_converters/audio_converters/f/64/p/296630/1041381.aspx#1041381