RX-51 BME Replacement - Page 4 - maemo.org

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biketool	2014-08-24 , 07:45
Posts: 1,417 \| Thanked: 2,619 times \| Joined on Jan 2011 @ Touring	#31

Originally Posted by Estel

Code:
echo dedicated /sys/class/power_supply/bq24150a-0/mode
Not swure what you mean by "temporary and permanent". This one sticks until reboot (to be precise, until module's load/unload, I think). If you want it permanent, you can put a script doing it in /etc/event.d/, but you wouldn't be able to connect to PC (or hostmode, or USB Networking, or...).

/Estel

OK, I see what you mean, I have some toggle scripts up over on the Qi thread.

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Kossuth	2014-10-03 , 07:49
Posts: 159 \| Thanked: 217 times \| Joined on Oct 2011	#32

Strange thing happened for my N900 few days ago. Somehow my batterys calibration info was lost and now the battery status show only 100% when on idle, 50% with normal usage and red 0% when under heavy use. This is exactly same behavior as when I started to use the BME Replacement and it was corrected after I calibrated my battery as Pali suggested in this thread.

Now it seems that my system lost the calibration info and treats my battery as uncalibrated. Ofcourse the fix for this would be to calibrate the battery again, but it requires some work to ensure that the battery drains slowly enough at the end and only then it is connected back to charger.

I would like to know is the any mechanism in the BME replacement that caused the calibration to be erased, so I could avoid it in the future. I'd like to know if it is possible to save calibrations and possibly overwrite them manually (I have couple of spare batteries, that I could calibrate and switch to the phone and update the calibration info manually, without doing the calibration routine).

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handaxe	2014-10-03 , 13:44
Posts: 1,378 \| Thanked: 1,604 times \| Joined on Jun 2010 @ Göteborg, Sweden	#33

Originally Posted by Kossuth

I would like to know is the any mechanism in the BME replacement that caused the calibration to be erased, so I could avoid it in the future. I'd like to know if it is possible to save calibrations and possibly overwrite them manually (I have couple of spare batteries, that I could calibrate and switch to the phone and update the calibration info manually, without doing the calibration routine).

I write only to confirm that this has happened to me. I am still trying to see if it is some or other sequence ... annoying.

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	Estel	2014-10-03 , 23:24
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#34

Originally Posted by Kossuth

but it requires some work to ensure that the battery drains slowly enough at the end and only then it is connected back to charger.

Or just charge it to full, disconnect (VDC 1, check with BNF when in doubt), then just use it normally, and let it turn itself off due to low power. It will shutdown safely, and get calibrated just before.

Originally Posted by Kossuth

I would like to know is the any mechanism in the BME replacement that caused the calibration to be erased

BME replacement or not, the chip mark itself as "uncalibrated" after 32 charging cycles without calibration. Again, you can check that with BNF ("Calibration required" flag).

/Estel

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Kossuth	2014-10-04 , 06:28
Posts: 159 \| Thanked: 217 times \| Joined on Oct 2011	#35

The problem is, if I let the phone just run out of juice, it happens most likely in the middle of the night, so I wont be getting wakeup alarm in the morning and have completely dead battery to start the day with. And if it happens during work day, I'd have to leave my phone charging at my desk an therefor be out of reach some part of my day.

It is curious that the battery calibration flag gets reset after 32 cycles (indeed I now have 33 cycles, so thet is what killed the info), because i've been using the same calibration data for 5 months, and I charge my phone every night, so it should have 150 cycles. Does anyone know what these full cycles consist of, so I can try to avoid them, I'm sure the battery has not reached EDV0 33 times in 5 months.

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foobar	2014-10-04 , 11:46
Posts: 203 \| Thanked: 445 times \| Joined on Mar 2010	#36

I have finally found the 'courage' to install the BME replacement.

I haven't tested it much at all, but the first thing that I noticed after installation was this:

My current N900 has recently shown signs of USB dysfunction. That is, it wouldn't charge nor let me establish a USB data connection.
It did, however, charge when using one of the various 'charge21' scripts floating around here on TMO.

Now, with the BME replacement installed, it charges again without such script, even from a battery bank, which previously didn't work out of the box either (only with a charge script).

Thanks pali!

Last edited by foobar; 2014-10-04 at 14:38.

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malfunctioning	2014-10-13 , 18:27
Posts: 330 \| Thanked: 556 times \| Joined on Oct 2012	#37

I know I'm obsessed with this question, so bear with me.

Since my battery charges in 3 hours or less and I can't deplete the battery in less than 4 hours even if I try, it would seem that it should be possible to run the N900 on AC power alone without battery.

Could this be possible in a future version of your bme, pali? In the case of the Zaurus SL-C1000 (a Linux PDA from a few years ago), you could do this as long as the distro allowed it and you didn't overcharge the system by mounting the CF slot.

Maybe enable this functionality by limiting screen brightness and locking CPU to 600Mhz maximum?

The N900 deserves to be future proof in this regard.

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	Estel	2014-10-13 , 19:51
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#38

Originally Posted by Kossuth

The problem is, if I let the phone just run out of juice, it happens most likely in the middle of the night, so I wont be getting wakeup alarm in the morning

I know it might not be for everyone, but getting dual-cell battery is easy way to solve it. I charge my device once few days (3 or more) thanks to 3Ah behemot. The difference from 1,3 Ah is astonishing, in practice.

Originally Posted by foobar

It did, however, charge when using one of the various 'charge21' scripts floating around here on TMO.

It's because BME replacement does the same thing as those scripts did, just implement it in kernel module level instead of userspace scripts and adds things like shutting down just after edv

Not to mention battery applet, that takes information from sysfs nodes created by said modules.

As for charging method from charging chip's point of view, it's exactly the same thing, though.

Originally Posted by malfunctioning

it should be possible to run the N900 on AC power alone without battery.

Could this be possible in a future version of your bme, pali?

Not possible hardware wise. The only thing you could achieve it, is to get a power source giving stabilized voltage in between 3.3V-4.2V range, and hook it up to battery pads.

The only way you can achieve it without such mods, is by shutting down all radios, turning brightness to minimum, etc. Basically, you can't use more than ~ 50 mA, and was usable only in battery hotswap proof-of-concept (which was just that - PoF - as it was more convenient to shut device down for swapping, anyway).

/Estel

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alexporta	2014-10-13 , 20:00
Posts: 91 \| Thanked: 29 times \| Joined on Dec 2009 @ Milan - Italy	#39

I try also here, sorry for the cross posting

hi to all
I'm testing the BME replacing from Pali. Great work!
But I have a BIG problem. I use a wall charger with 4 batteries. So when I change a battery the one I insert is not calibrated and I have 0/0.
Can I revert to original or old or CSSU BME? If I try to use the stok one (the link given above) it says is not existing

Thanks in advance

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malfunctioning	2014-10-13 , 23:00
Posts: 330 \| Thanked: 556 times \| Joined on Oct 2012	#40

Originally Posted by Estel

Not possible hardware wise. The only thing you could achieve it, is to get a power source giving stabilized voltage in between 3.3V-4.2V range, and hook it up to battery pads.

The only way you can achieve it without such mods, is by shutting down all radios, turning brightness to minimum, etc. Basically, you can't use more than ~ 50 mA, and was usable only in battery hotswap proof-of-concept (which was just that - PoF - as it was more convenient to shut device down for swapping, anyway).

/Estel

Thank you, Estel. I think we had this conversation before but I had forgotten there was a definite restriction due to hardware. Being naturally stubborn, I thought it would be possible due to the fact I wish it were. I will stop now though.