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Subject: Re: Sansa radio driver (AS5314 help

Re: Sansa radio driver (AS5314 help

From: Ivan Zupan <>
Date: Sun, 13 May 2007 11:49:52 -0800

Hi Christian,

Thanks for the code. I have tried it, and was able to hear a buzzing
sound when the LCD was on. Did you notice this on your player? I have
set the FM chip to max volume output, so it should be significantly
louder. Line2 may be a good candidate, as the original radio is
unaffected when the screen dims. Also, setting the volume lower, seems
to make the buzz louder and vise-versa. So it may be the AS chip
generating the buzzing in the first place.
Unfortunately it was 3am when I got your message here, so IRC was not an
option :-)
The radio tuning is turning out a lot more complicated than the other FM
drivers, and the datasheet is ambiguous in the most critical parts.


Christian Gmeiner wrote:
> Hi Ivan...
> I have committed some changes to as3514 driver to enable lineIn 1 and
> set some default gain.
> Lets hope FM chip is connected to LineIn1 else we could try LineIn 2.
> Please keep me up2date...
> greets,
> Christian
> 2007/5/13, Christian Gmeiner <>:
>> Hi Ivan..
>> can we meet us in irc... I will hang around for the next 2-3 hours
>> there. My nick
>> is austriancoder. It should be a work of 10-15 minutes. Or I can
>> modify the driver
>> to enable lines and micros and you can check which is needed. I have
>> only a
>> Sansa without radio :(
>> See you there
>> 2007/5/13, Ivan Zupan <>:
>> > Hi all,
>> >
>> > I am working on a Sansa radio driver. So far, I have implemented the
>> > basics for the LV24020LP chip, and have been able to tune and measure
>> > signal strength. However, I need some help with getting the AS5314
>> chip
>> > to enable line in (or mic in depending on how they connect the radio).
>> > Since the AS chip is covered by an NDA of sorts, I need someone who
>> > signed it to update the driver so that we can get these two sources to
>> > "mix" (or just channel one of them) to the headphone jack.
>> >
>> > TIA,
>> > Ivan
>> >
>> >
Received on 2007-05-13

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