Am Mi 29. April 2009 schrieb Cédric Berger: > On Tue, Apr 28, 2009 at 15:36, Joerg Reisenweber <jo...@openmoko.org> wrote: > > > > > That's nonsense as there is no dumb charger out there not being capable of > > supplying 500mA. OTOH any management of maximum ingress current to USB by > > whatever means will inevitably fail when unplugging the charger device > > connected to FR during powerdown and replace it with a (nonexistent) weaker > > one. > > And what if the "charger" is a small usb host device... like a Freerunner ? Then uBoot should do standard USB enum. Which is negotiating current host is able to deliver.
> Or a solar panel ? How could setting BAT_CURLIM to USB_CURLIM help? > Or you have 2 phone charging from the same usb port ? or I'm using the usb extension in my usb-coffemug-warmer? Or create a shortcircuit? It's not a valid usecase and I don't see how to accomplish that. > I usually charge from a car charger and when I want to charge faster than > 500mA from usb (so ~300mA to battery with phone on), I have to push usb > limit to 1A. No you have to push USB_CURLIM to >500mA, if you want >500mA. > But as it is too much for my poor charger, I also limit battery charge > current (ex 500mA). How could setting BAT_CURLIM to USB_CURLIM help? > This way I have about 700-750mA pulled from my charger (though it can peak > to 1A as needed). What's the rationale behind that? If you set USB_CURLIM to 750mA you get exactly the same behaviour without the useless "when needed" part. How could setting BAT_CURLIM to USB_CURLIM help? > > Note than doing this (I used a little GUI with 1 set button for each value), > I must set usb current limit, then only I set charge current limit. And in > the meanwhile, since charge limit=usb limit=1A, it starts pulling about 1A > and I cannot avoid that. Sorry I don't understand this statement. /j
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