From: Jerry Van Baren <gerald.vanbaren_at_smiths-aerospace.com>
Date: Tue, 22 Feb 2005 12:54:46 -0500

Matthias Klumpp wrote:
> Hi Jerry,

[snip]

> I think you're misunderstanding me:
> The 2nd situation is the one with problems in the original RB V2.4 (and
> still with problems in the org. SW).
> The "ajbrec.ajz" that you published 05.Feb was also not working in that
> condition, but the update from 07.Feb. was doing it.
> That was bevore you started the "big operation"
>
> I'll now go to test the latest one:
> <http://sourceforge.net/tracker/index.php?func=detail&atid=439120&group_id=4
> 4306&aid=1116884>
>
>
> I'll tell you
>
> Regards
>
> Matthias

Hi Matthias,

In answer to your second email, the file _should_ be in the root
directory "/powermgmt.csv". I brought my unit in to work today and am
playing with it right now... I don't see the file. It looks like I
screwed up and uploaded a version that has the battery info recording
turned off. I'll have to fix that tonight when I get home. Sorry.


The original unmodified Rockbox and the "ajbrec.ajz" from Feb. 5 limits
the "on" time for trickle charge to 40% (24/60 seconds). Because your
power supply has a lower voltage, this restriction was preventing it
from maintaining your battery charge, leading to your dead batteries and
frustration. This is an unnecessary restriction because the software
controls the battery's charge voltage (and thus the charge current) just
fine regardless of the charger's voltage (within limits, of course :-).

The second "ajbrec.ajz" from Feb. 6 (based on the patch page date stamp)
removed the 40% restriction and you found that to be a Good Thing[tm].
That was a good test and answered the primary question of what was
happening to you. The 40% restriction is still removed in the
"ajbrec.ajz" posted on Feb. 19, which is why I'm confident it will work
for you.

The main question I'm interested in is characterizing the trickle charge
control (trickle_sec) and recharge rate (how long it takes to recharge,
what the battery voltage curve looks like at the end-of-charge) with
your lower voltage (~9v) charger. That is why I'm interested in some
recharge cycles from your setup.

My expectation is to do a little more tweaking (charger start state:
charge/top-off/trickle) and testing (aargh: time consuming) and declare
victory this week.

gvb
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Received on 2005-02-22