Hi Ash,
Please find the answer to the questions you have asked.
> You are able to get the bluetooth on with 460800/921600
baud-rate
> using hciattach??
yes. I mean hciattach is working with the above
baud rates
>But you want to change the baud-rate using hciconfig
too??
No, I am doing hciconfig hci0 up I am getting
the followin error.
I am getting Can't init device hci0 : Connection Timed Out (110).
But the things are working perfectly with 115200 Baud rate.
hciattach with 115200 speed
hciconfig hci0 up
====> Working
hciattach with 460800 or 921600 baud-rate - > working
hciconfig hci0 up -> not working Connection timed Out error.
Thanks,
Jaya Chandra
On Nov 14, 3:54 pm, Ash <ashoks...@gmail.com> wrote:
> And what error are you getting when you do hciconfig with other baud-
> rate configurations??
>
> On Nov 14, 3:49 pm, Ash <ashoks...@gmail.com> wrote:
>
> > Hi Mike,
>
> > Let me understand your problem clearly.
>
> > You are able to get the bluetooth on with 460800/921600 baud-rate
> > using hciattach??
> > But you want to change the baud-rate using hciconfig too??
>
> > On Nov 13, 7:12 am, Mike <mikebro...@gmail.com> wrote:
>
> > > HiAsh,
> > > Thanks for the reply.
> > > Yeah I checked the hciattch.c file, there is baud rate change code for
> > > 460800 as well as 921600.
> > > And I am able to do hciattach with the above configurations but the
> > > hciconfig hci0 up is not working.
> > > Please lemme know ...
>
> > > On Nov 12, 8:46 pm,Ash<ashoks...@gmail.com> wrote:
>
> > > > One more thing about:
>
> > > > "If yes please let me know how can I do that since hciconfig hci0 up
> > > > is
> > > > not working with baud rate more than 115200."
>
> > > > To resolve this erify that you platform specific code in hciattch has
> > > > required code to do the baudrate change.
>
> > > > On Nov 12, 8:42 pm,Ash<ashoks...@gmail.com> wrote:
>
> > > > > Hi Mike,
>
> > > > > Yes, you need to increase the baud rate, chanding bit pool value will
> > > > > not help you definately. Ideally high quality A2DP audio data needs
> > > > > 320-350Kbps of band width. For running this you would need baud-rate
> > > > > of 460.8Kbps which will run basic audio(80% audio data) for you, but i
> > > > > would suggest you to use 921.6Kbps.
>
> > > > > Changing the baud-rate will depend platform you are using. In BlueZ
> > > > > baud-rate is configured using hciattach tool during bluetooth on
> > > > > process. hciattach has platform specific code which does the vendor
> > > > > specific initialization and baud-rate change.
>
> > > > > By the way which platform are you working on?
>
> > > > > I am not sure hci0 up would work, i will verify and come back to you.
> > > > > If you are working on source code you can check in hciattach, whether
> > > > > it is possible or not. And intial configuration for hciattach is taken
> > > > > from init.trout.rc, you can set the configuration in there.
>
> > > > > On Nov 11, 7:08 am, Mike <mikebro...@gmail.com> wrote:
>
> > > > > > Hi All,
> > > > > > I am working on the eclair code base. And I just started enabling
> > > > > > BlueZ and started working on it.
> > > > > > The basic profiles seems to be working fine. But When I play media
> > > > > > on
> > > > > > my headset there is a time delay oocured when playing the media on
> > > > > > headset and hence after 2 seconds of play it stops for 2 seconds and
> > > > > > plays again.
> > > > > > During this process I saw error message "a2dp_write failed err:
> > > > > > -110".
>
> > > > > > 1-01 00:09:48.980: INFO/AudioHardwareALSA(1991): Initialized ALSA
> > > > > > PLAYBACK device AndroidPlayback_Speaker_normal
> > > > > > 01-01 00:09:48.980: DEBUG/AudioHardwareALSA(1991): Set PLAYBACK PCM
> > > > > > format to S16_LE (Signed 16 bit Little Endian)
> > > > > > 01-01 00:09:48.985: DEBUG/AudioHardwareALSA(1991): Using 2 channels
> > > > > > for PLAYBACK.
> > > > > > 01-01 00:09:48.985: DEBUG/A2DP(1991): ********** a2dp_write
> > > > > > **********
> > > > > > 01-01 00:09:48.990: DEBUG/A2DP(1991): bluetooth_start
> > > > > > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Set PLAYBACK
> > > > > > sample
> > > > > > rate to 44100 HZ
> > > > > > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Buffer size: 4096
> > > > > > 01-01 00:09:49.000: DEBUG/AudioHardwareALSA(1991): Latency: 92879
> > > > > > 01-01 00:09:49.080: INFO/vold(3225): Android Volume Daemon version
> > > > > > 2.0
> > > > > > 01-01 00:09:49.465: WARN/AudioFlinger(1991): OutputTrack::write()
> > > > > > 0x23cc0 no more overflow buffers
> > > > > > 01-01 00:09:49.490: DEBUG/A2DP(1991): wait_for_start: 500575 us
> > > > > > 01-01 00:09:49.490: ERROR/A2dpAudioInterface(1991): a2dp_write
> > > > > > failed
> > > > > > err: -110
> > > > > > 01-01 00:09:49.500: WARN/AudioFlinger(1991): write blocked for 512
> > > > > > msecs, thread 0x23658
> > > > > > 01-01 00:09:49.500: DEBUG/A2DP(1991): ********** a2dp_write
> > > > > > **********
> > > > > > 01-01 00:09:49.705: WARN/AudioFlinger(1991): OutputTrack::write()
> > > > > > 0x23cc0 no more overflow buffers
> > > > > > 01-01 00:09:49.820: WARN/AudioFlinger(1991): OutputTrack::write()
> > > > > > 0x23cc0 no more overflow buffers
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): Received BT_RESPONSE -
> > > > > > BT_START_STREAM
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): Received BT_RESPONSE -
> > > > > > BT_NEW_STREAM
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): wait_for_start: 431150 us
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): poll: 20 us
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): send: 189 us
> > > > > > 01-01 00:09:49.930: DEBUG/A2DP(1991): avdtp_write: 297 us
>
> > > > > > I tried reducing the bitpool till 20 and tried but I did not see any
> > > > > > variation in the performance.
> > > > > > As of now I am using the Baud rate of 115200 should I increase the
> > > > > > baud rate.
> > > > > > If yes please let me know how can I do that since hciconfig hci0 up
> > > > > > is
> > > > > > not working with baud rate more than 115200.
> > > > > > waiting for ur reply guys
> > > > > > Thnaks in Advance!
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