[Gta04-owner] fm-tuner

Dr. H. Nikolaus Schaller hns at goldelico.com
Wed Aug 21 08:10:15 CEST 2013

Am 20.08.2013 um 23:16 schrieb Benjamin Deering:

> On 06/24/2013 05:38 AM, Dr. H. Nikolaus Schaller wrote:
>> What could be next steps?
>> 1. make the SI47xx driver use I2C
>> and add ALSA mixer controls for e.g. setting frequency,
>> scanning and asking for signal strength etc.
> Is anyone else using alsa this way?  The few linux radio examples I saw used v4l (which sounds like a lot of work).

AFAIK fm isn't used that way by anyone else.

>> You may ask why we need this if we can control I2C directly from
>> user space. The reason why I think we need it is that suspend/resume
>> must do the correct clock switching sequence and this needs interaction
>> between the McBSP and the Si47xx drivers.
>> 2. find out why it works on one board only
> It is working on my board (thanks for making this demo program).  


> It took several tries to upgrade u-boot.  I ended up using strings /dev/mtd1 |less to confirm I successfully upgraded.  To get reception I need to insert my headphones partway into the GTA04.
> I have some extra 2.5mm jacks, is there a way to make an antenna only cable so I can play radio through speakers?

Yes, that should be possible. Just solder a 20-30 cm single wire to the shield of the 2.5mm plug.


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