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Subject: Re: Serial connection and Rockbox?
From: Joseph Jones (joe_at_bumpycarrot.cjb.net)
Date: 2004-02-11


BlueChip wrote:
> At 22:28 10/02/04, you wrote:
>
>> [IDC]Dragon wrote:
>>
>>>> Right, so it's kinda... half-duplex without modding the box?
>>>
>>>
>>> Correct.
>>>
>>>> So... some kind of two-way communication is possible without
>>>> internal modding, though it may not be overly fast?
>>>
>>>
>>> Yes, I use this e.g. for my Alpine CD changer emulation, to hookup to
>>> a car
>>> stereo. It doesn't require much speed.
>>> The max. baudrate on the RX (remote) pin is 345600 Baud for a recorder,
>>> Clk/32. The transmit would have to be done by bitbanging, which can
>>> also be quite
>>> fast. We do similar for the LCD and get >800kHz.
>>> It can be envisioned to tie multiple boxes together and form a kind of
>>> network with it, collision detection like for ethernet.
>>> Jörg
>>>
>>
>> So fairly fast communication could be possible, it just wouldn't be
>> any kind of existing protocol for the low-level stuff.
>>
>> Is the RX pin the 4th pole on the headphone socket that the in-line
>> remote hooks up to? So there'd be two physical connections for two-way
>> communication?
>>
>> That seems reasonable :) In fact, for an Mp3 player, it's options seem
>> quite wide.
>>
>> I think I'm gonna have to pick up a C book after this week's over (ICT
>> coursework implementation and the start of testing to be in on
>> Thursday, or my head). If I'm hoping to be getting to grips with
>> networking anytime soon, I'll have to study double-time :)
>>
>> I don't hold up much hope in myself, but a little pipedream never hurt
>> anyone :)
>>
>> It's interesting seeing just what is possible with the hardware to
>> hand. I mean, we've already got faux-greyscale movies with sound, and
>> it was no way designed for that :) I'd say Rockbox adds a good ~£100
>> to the value of a JBR :)
>>
>> Joe
>
>
> Have to offer my advice on my favourite C book:
>
> Title: C/C++ Second Edition - Programmer's Reference
> Author: Herbert Schildt
> Publisher: Osbourne
> ISBN: 0-07-212706-6
> Cost: $20 / £13
>
> It will NOT teach you how to program - it will NOT _teach_ you how to
> use pointers & references (I have a great PDF (somewhere) for that) -
> but it IS THE best programmer's reference I have ever found.
>
> BC
> _______________________________________________
> http://cool.haxx.se/mailman/listinfo/rockbox
>
>

Thanks buddy :) I'm always open to suggestions.

Joe
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