Richard A. Smith
richard at laptop.org
Mon Apr 5 17:37:03 EDT 2010
I have an 1.5 pre-release firmware I'd like some wider testing on.
Please install this on your 1.5 and run some charge/discharge cycles on
There's a few minor changes in OFW from this and q3a35 mostly the
addition of some commands that let you enable and disable EC MPPT and
observe whats going on.
The real changes are in the EC code. The introduction of MPPT  into
the firmware required deep structural changes to the battery & 1-wire code.
While I was ripping everything apart I also implemented some of the more
invasive changes I had planned.
If I got everything right you should see zero difference between battery
operation on a35 and a35e except that some bugs are fixed.
I've been running this code on all of my test machines for the past 2
weeks churning through lots of charge/discharge cycles with no problems,
but I won't be surprised if there's still a few regressions waiting to
Although this firmware has the ability to do MPPT when connected to a
solar panel its disabled by default. The reasons for that are:
1) I'm the only person who as a XO properly modified for MPPT to work.
2) Its not quite ready yet. It backs off the power sometimes when it
The point of this pre-release is to get some wider testing of the new
battery code and not MPPT. I'll announce when the MPPT stuff is ready.
Richard A. Smith <richard at laptop.org>
One Laptop per Child
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