[Gta04-owner] fm-tuner - was Re: hw routing audio patch removed in 3.7?

[Dr. H. Nikolaus Schaller]

Am 23.10.2013 um 19:13 schrieb Andreas Kemnade:

> On Wed, 2013-10-23 at 18:52 +0200, Andreas Kemnade wrote: 
>> On Wed, 2013-10-23 at 15:25 +0200, Christoph Mair wrote: 
>>> On Wed, Oct 23, 2013 at 1:06 PM, Andreas Kemnade <andreas at kemnade.info> wrote:
>>>> On Mon, 2013-06-24 at 11:38 +0200, Dr. H. Nikolaus Schaller wrote:
>>>>> Hi,
>>>>> fm-radio appears to work. At least on one board (the one where I did solder some wires to measure the clocks and PCM signals).
>>>>> [...]
>>>>> Now comes the bad news: it works only on one GTA04 board and I don't
>>>>> know why it fails on the others I have tested. Since they have no wires I
>>>>> can't check if the clocks are available and the Si47xx is sending PCM
>>>>> to the CPU or not. Or if there is something unreliable in the McBSP config.
>>>>> 
>>>>> It could also be some hardware issue. If you look into the schematics, there
>>>>> are series resistors for the McBSP1 interface. Their values are choosen
>>>>> based on the recommendations of a reference design we had found.
>>>>> 
>>>>> But 2k2 appears a little high value, taking into account that we have a 2.5 MHz
>>>>> clock. I.e. the signals may be damped and too slow so that e.g. the clocks
>>>>> are not recognized correctly.
>>>>> 
>>>> I do not understand the connection here. The McBSP sends out its clocks.
>>>> It should look at the data pin at the right times and interpret whatever
>>>> is avilable there at sampling time if i understand the I2S stuff
>>>> correctly. So we should be able to read some suff and arecord should
>>>> spit out something.
>>> 
>>> One thing which comes to my mind: did you mux the clock output pin as
>>> input? While this seems wrong, the McBSP needs this configuration to
>>> use its own clock as receive clock. The pin works as output
>>> nonetheless.
>>> 
>> Ehm,.. I should have followed the link about uboot in the mail. As
>> pinmux settings in uboot are of course right (everything to output I
>> thought, I have checked that often), I thought hns has accidently run an
>> ancient uboot instead of an old one...
>> So I did not update my uboot. Ok, that seems to be the missing part of
>> information I needed all the time when I was experimenting with that.
>> At least I now get something out of the McBSP1. Now I am searching my
>> headphone.
> 
> Ok, I found my headphone, I put the gta04 near a window on the side
> towards the radio station, replaced the arecord | aplay pipe  in the
> script by
> 
> arecord -D default:CARD=gta04fm -r 48000 -f S16_LE -c 1 | aplay -r 48000
> -f S16_LE -c 1
> 
> and I had reception with good sound quality.

++

So which U-Boot/Kernel combination did you finally use?

BR,
Nikolaus