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Subject: Re: Sansa radio driver (AS5314 help

Re: Sansa radio driver (AS5314 help

From: Michael Sevakis <jethead71_at_sbcglobal.net>
Date: Wed, 16 May 2007 19:36:55 -0400

This brings up some important questions to answer: What audio
processing/switching hardware exists outside the codec chip (besides this)?
Is it an established fact that the OF eq is software? Signal processing
could easily be slipped in on the I2S bus between the CPU and AS3514.

I noticed also location 70000020 is always checked after reading TIMER1_VAL
once in the OF menu. Value is always 0x40000000 at least to the point I've
gone so far.

----- Original Message -----
From: "Ivan Zupan" <zivan56_at_iwdstudio.com>
To: "Rockbox development" <rockbox-dev_at_cool.haxx.se>
Sent: Wednesday, May 16, 2007 5:26 PM
Subject: Re: Sansa radio driver (AS5314 help

> Great news folks. Very loud audio!
> The secret was the stuff involving address 0x70000084 and 0x70000080!
> Now to work on the algorithms for tuning and getting volume control to
> work with the line1 in (very loud even if gain is very low)
> Btw, the settings below actually mute line1 in while tuning, so it is a
> bit misleading :)
> Thanks for the help with figuring this out.
>
>
>
> Antonius Hellmann wrote:
> > If you can hear any sound, then I would assume, that the device is
> > working.
> > So nothing more to be done with the radio init/powerup.
> > I bet, that the audio configuration is not correct yet.
> > In the emu I found following AS3514 init sequence after entering the
> > radio menu
> > and after setting up the tuner:
> > AUDIOSET1 4e
> > 70000084 |= 1 <<<<< don't know, wether this is radio related
> > 70000080 |= 4 <<<<< don't know, wether this is radio related
> > HPH_OUT_L e0
> > HPH_OUT_L 6b
> > HPH_OUT_R eb
> > LINE_IN1_L df
> > LINE_IN1_R df
> > AUDIOSET1 4a
> > AUDIOSET1 4e
> > LINE_IN1_L df
> > LINE_IN1_R df
> >
> > And regarding your other question:
> > 69ddd55 0000e8f4 CPU ???????? 70000020 R4-40000000
> > 69ddd57 0000e8fc CPU ???????? 70000020 W4-40000000
> > I added the comment after looking at the assembler code at addr
0000e8f4.
> > The cpu reads a value from 0x70000020, bics bit11 and stores the
> > result. Nothing wrong here.
>
Received on 2007-05-17


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