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Subject: Re: Sansa radio driver (AS5314 help

Re: Sansa radio driver (AS5314 help

From: Rene Peinthor <peinthor_at_gmail.com>
Date: Mon, 14 May 2007 09:41:38 +0200

On 5/14/07, Ivan Zupan <zivan56_at_iwdstudio.com> wrote:
>
> Barry Wardell wrote:
> > It's great to see progress on this. This is just a wild guess, but I
> > wonder if we have to enable a GPIO port to enable proper audio? When I
> > first got sound working on the H10, the volume was very faint until I
> > discovered that one of the GPIO ports enabled audio output. I wonder
> > if this could be the case here too. This page:
> > http://www.rockbox.org/twiki/bin/view/Main/PortPinAssignments#e200_GPIO
> > might be of some help in figuring out which ports to check.
>
> MrH found a reference to a memory address which might need to be set,
> and I have had it in the code from the start. However, I am sure that
> the tuner is fully enabled since I am able to read registers properly.
> The tuner only has 3+2 active pins, 3 for communication via GPIOH and 2
> for stereo sound hooked up to line1_in on the AS3514 chip. I believe I
> am not writing to the FM chip properly and hence unable to set the
> proper volume on it. However, it seems to react properly to some write
> commands (ex. force stereo turns the status register to indicate stereo).
> I know some people have disassembled the original code, hopefully
> someone knows a bit more about the chip. The datasheet is lacking to
> say the least, and it is not specific to this tuner (rather, the whole
> family of these tuners).
>

You could try Toni's emulator, maybe this gives some hint's about GPIO ports
or memory addresses, but i don't know how much the emulator works with the
radio part of the OF.

http://www.rockbox.org/tracker/task/6524
Received on 2007-05-14


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