[FSO] Any luck with bluetooth headsets?

Andy Green andy at openmoko.com
Sun Feb 22 10:57:45 CET 2009

Hash: SHA1

Somebody in the thread at some point said:
| Andy Green <andy at openmoko.com> writes:
|> As I understand it, the problem with CPU digital audio on BT is that
|> there is no routing path in the WM8753 hardware between the two digital
|> audio interfaces (CPU and BT).  As in literally it's not there in
|> the chip.
| Routing audio between SoC and Bluetooth should be possible through HCI
| (that is, BT is connected via USB to SoC). The chips shipped in the
| Freerunners have default eeprom setting (they call it ps keys) to route
| SCO audio (i think that doesn't affect A2DP) over PCM interface. This
| setting can be changed but after that one has to issue a special
| command every time he wants to route the next SCO communication over
| PCM.

That sounds like a great workaround, although unless it exposes some
digital audio device class entity it sounds like work to stitch it
together into something you can pipe audio into.

| Unfortunately, the BT earpiece i have here for testing works only with
| laptop for now (with the same bluez), with FR i hear only ambient noice.
|> Maybe there's some way to meddle it through the ADC and DAC but other
|> than that it doesn't work IIUI.
| Doesn't seem it can be possible on Freerunner because both DAIs are
| timed fully independently.

Keeping it all digital on USB would be a superior solution.  You can get
these EDR stereo headsets now it would be a nice feature.

- -Andy

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