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Subject: RE: Remote control with display
From: Stuart Tedford (stuart.tedford_at_piresearch.co.uk)
Date: 2002-10-03


Hmmm, on the remote side, how do you both tx and rx data on the same piece
of wire without upsetting the UART?

Stu.

> -----Original Message-----
> From: ActiveSystems [mailto:activesystems_at_caverock.net.nz]
> Sent: 03 October 2002 08:36
> To: rockbox_at_cool.haxx.se
> Subject: Remote control with display
>
>
> Hi
>
> I was checking out the hw spec for the controller in the Jukebox (and
> reading some of the old postings to this group).
>
> Pin PB10 which the remote is connected to is usually
> configured as serial
> comms port so it can receive async data from the remote.
>
> The pins on port B can also be configured as a general I/O so
> it could quite
> easily output data to the remote as well. Good thing about
> this is that we
> could use this outgoing data to run an external display.
>
> It should be relatively easy to intermittently reconfigure
> PB10 as an output
> pin and throw out some data to the remote, then pop it back
> in receive mode
> to watch for commands from the remote. If the outgoing data
> was at 100kbps
> or so then it would be unlikely that the player will miss any remote
> commands. - 50 bytes of data will only take 5ms. Each line
> of text to be
> displayed on the remote can have a byte or so of control data
> saying if it's
> to be scrolled, scrolling speed etc.
>
> I'd be quite happy to do the remote end of things - sw + pcb
> etc for people
> wanting to build their own.
>
> My question is how hard would this be to implement on the
> Jukebox? If there
> are any existing tasks that are executed at 100kHz or so then
> I would think
> that you could use that proc to bit-bang any waiting data out
> PB10. Can
> connect to a UART on the remote micro to receive the data.
> Would just have
> to check that the o/p on the Archos remote is buffered then
> it should still
> work.
>
> thoughts?
>
> Hamish
>
>
>



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