Thread: Thread for problems getting USB hostmode working.
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joerg_rw is offline joerg_rw
2010-11-17 , 22:13
Posts: 2,222 | Thanked: 12,651 times | Joined on Mar 2010 @ SOL 3
#57
Originally Posted by stlpaul View Post
I'm still waiting for my USB adapter to arrive in mail before I can try to attach a real device, however:

- USB/wall charger is not attached to N900
- Start h-e-n
- Wait 5 seconds
- Close h-e-n
- Battery is now detected as having MUCH less life.

For example if I have 90% battery remaining suddenly it will have 50% remaining. If I open h-e-n for 5 seconds and quit again, suddenly N900 says my battery is dead.

(I understand that BME must be stopped for h-e-n to function and that battery monitoring won't work while it is active, I'm talking about after h-e-n has closed)

Is this normal experienced by everyone else or have I got something wrong? I'm using power45 and h-e-n 0.2-8

EDIT/Update: I decided to try "stop bme" followed by "start bme" and after issuing these commands, the battery level appears to be the normal (expeced) value again.
Don't ask me what bme is doing to guesstimate battery capacity. Maybe it gets confused by 'sudden' voltage drop, or it goes mad about somebody "messed with bq24150" - no idea. My suggestion: just ignore it. If battery really would drop at that rate, your device would melt and glow.
BME is known to store things to CAL (a persistent storage partition for all sort of small data), and maybe it decides battery has to be very near to an end when voltage is dropping by 100mV from last probe to next probe (ignoring there were arbitrary off times between). Aslo BME is known to lie about capacity. This seems in accordance with other phones. The icon is all but linear.
/j
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Last edited by joerg_rw; 2010-11-17 at 22:23.