Rockbox mail archive
Subject: Re: FM Recorder news
From: Mike Holden (rockbox_at_mikeholden.uklinux.net)
This really is excellent news. I think we are pretty much as far forward
as we can get by using the existing code, so it needs somebody who knows
their way around PCBs and wires to take us to the next level - that person
certainly isn't me!
Well done Matthew - we all salute you, and if I ever meet you, I'll buy
you a beer or two!
Linus Nielsen Feltzing said:
> Hello everyone!
> We have a new hero in town!
> Matthew P. OReilly wanted me to have a really great birthday so he
> bought me a gift. An FM Recorder 20!!!
> I am speechless! This is the most generous donation this project has
> received so far. Now we can finally start reverse engineering the FM
> I got it today, and immediately took it apart. My findings so far:
> o The FM radio part is encapsuled in a box and hard to take apart. 8
> wires are connected to it:
> o The antenna, which goes to the ground on the headphones
> o The VCC
> o 4 wires go to PB0-2, (LCD control), and PB4 (the OFF button).
> The LCD pins can be used for radio control without interfering
> with the LCD as long as the LCD CS pin is high.
> o 2 wires go to the MAS INL and INR pins, obviously the left and
> right audio channels.
> My guess is that they use Samsung for the FM radio as well as
> the LCD controller, so it is probably the S1A0903X01. I will try to
> verify this by analysing the data on these 4 pins with a logic
> analyzer on monday.
> o It uses 2 LiIon cells i parallel supervised by a Linear LTC1734
> battery charger.
> o It has a Linear LTC1872 step-up DC/DC controller to generate 5V,
> probably for the disk drive.
> o There is a serial EEPROM, looks like a Microchip 24LC02, that is
> connected to the ISD300. This is used for the ATA Identify block
> I will produce some schematics later on, along with detailed pictures on
> the naked device. Stay tuned.
> /The damn thing was pretty touch to take apart. I guess Archos' support
> strategy is to replace broken devices rather than repair them...)
> Time to sleep. Over and out,
Page was last modified "Jan 10 2012" The Rockbox Crew