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Subject: Still Problems with AJB Remote
From: Matthias.Klumpp_at_gmx.de
Date: 2004-07-08


Hi everybody,

I'm still having trouble with my remote control.

I'm driving the JB remote pin with the UART of an Atmel uC.
Due to the fact this output is configured as serial UART TX line, it is not
possible to have a open collector configuration of that uC port.
My uC is powered with 5V and as I know the JB's have 3.3V.

Ok so far - now the problem:
If I connect a open collector transistor stage (just to not power the JB's
input with 5V) between uC TX line and JB remote pin, the serial remote
commands are accepted by my Studio Player, but not with Recorder's (none of
them).

-> so the serial settings should be ok (like Baudrate)

Sophana told me once to simply use a 10k resistor and connect it directly
from my uC's UART pin to the JB's remote pin.

That's working with my Studio (with Rockbox) and the Recorder V2 (with
Rockbox), but not with the old Recorder's (original Archos Firmware). Same
if I use a 1k resistor.

I also tried that simple resitor (10k) with a voltage level of 5V and 3.3V
on my UART output. No effect.

Does anybody know, what are the differences of the remote input circuit
inside the Studio Player's, old Recorder's and newer Recorder's (like V2) ?

Maybe anybody has a schematic ?

Do Rockbox and the original Archos Firmware have some differences in
handling the remote input ?

Does anybody know a universal circuit to drive the remote pin, that works
with ALL models ?

Many thanks in advance (I'm getting crazy with that ;-))

Matthias

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