Hi! > > Anyway, >5.5hours of standby with screen off, GSM on is already > > usable. > > Just to rub that in, you do mean GSM usable for voice calls and > SMS with your unicsy_demo with mainline kernel plus the pending > LCD related patches, right? :) > > > This is the core of code I'm using. > > > > https://github.com/pavelmachek/unicsy_demo > > > > Battery graphs are attached. I'm not sure if the battery was really > > close to empty at that point -- voltage curve should have different > > shape if that was the case. > > Cool. BTW, the value for POWER_SUPPLY_POWER_AVG should be quite > accurate for the whole device power consumption. > > It comes from the shunt resistor measured by the PMIC. Sorry I don't > remember how often it needs to be polled but I'm guessing polling it > once a minute or so should be plenty. I'd like current_avg more, but if I cat it manually, it changes on order of seconds, and quite significantly... which suggest shorter polling interval would be needed. user@devuan:/sys/class/power_supply/battery$ date; cat current_now current_avg Thu May 3 09:33:05 CEST 2018 -71000 -218408 user@devuan:/sys/class/power_supply/battery$ date; cat current_now current_avg Thu May 3 09:33:06 CEST 2018 -61000 -200238 user@devuan:/sys/class/power_supply/battery$ date; cat current_now current_avg Thu May 3 09:33:06 CEST 2018 -51000 -209879 user@devuan:/sys/class/power_supply/battery$ date; cat current_now current_avg Thu May 3 09:33:07 CEST 2018 -56000 -72308 user@devuan:/sys/class/power_supply/battery$ date; cat current_now current_avg Thu May 3 09:33:08 CEST 2018 -37000 -211362 > Hmm oh and the POWER_SUPPLY_CHARGE_COUNTER value should be monitored > by your libbattery and it's low value and high value should be saved > to a file. Low should be saved when we get the battery low interrupt > and battery state changes to POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL. > High value should be saved on POWER_SUPPLY_CAPACITY_LEVEL_FULL. > > Then when you know the high value and low value, you can calculate > the remaining capacity based on the current value and > POWER_SUPPLY_POWER_AVG. I'll look into that... but probably will do experiments with python, first. Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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