[Gta04-owner] FM Transceiver - split frequency?

Belisko Marek marek.belisko at gmail.com
Wed Apr 11 23:53:47 CEST 2012

On Mon, Apr 9, 2012 at 8:20 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
> Hi,
> On Mon, 2012-04-09 at 19:04 +0200, Christ van Willegen wrote:
>> Hello,
>> I was wondering if the FM transceiver was a split-frequency receiver/sender?
>> If so, it would be possible to tune to an FN station, 'overlay' system
>> audio over it and transmit it to a (car) FM receiver on another
>> frequency. That way, you can overlay voice navigation, messages, read
>> SMS messages, you name it...
>> But is that possible with the hardware?
> At least using it that way is not documented. There is something
> like this in the docu:"Write xx to register yy to put it into transmit
> mode" and "Write xx to register yy to put it into receive mode"
> So I guess no.
> But there are also usb-sticks containing that kind of chip so maybe
> that is a solution. The transmitter needs also a separate antenna.
> There is no one in the gta04. I have not tried connecting one and
> using the si4721 as a transmitter.
> About the driver. the status is:
> I can play audio data into the si4721. It arrives at the right pin.
> Clock comes from the SoC and looks sane.
Is there any driver available for that? I plan to work on FM receiver.

> When I try to record things from the si4721,
> I also have clock signals from the SoC and the si4721
> gives out data at the right pin but programs like arecord
> do not spit out data.
> Greetings
> Andreas Kemnade
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Marek Belisko - OPEN-NANDRA
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