car charger
Michael Shiloh
michael at openmoko.org
Sun Oct 12 01:38:20 CEST 2008
Joel Newkirk wrote:
> On Fri, 10 Oct 2008 09:05:09 -0700, Michael Shiloh <michael at openmoko.org>
> wrote:
>> David Garabana Barro wrote:
>>> On Friday 10 October 2008 12:50:57 Cédric Berger wrote:
>>>> Ok, thanks...
>>>> Would be interesting if by chance you could check between the ID pin
>>>> and ground if you have a resistance close to 4.7Kohm ...?
>>> I will look at it, and post the results.
>> Anxiously awaiting your measurements.
>>
>> If there is no 4.7K resistor, I'd move this discussion to the kernel
>> list. We should not be charging at 1A if we do not see this resistor.
>
>
> The cig lighter adapter I got is just a USB port, (the ID pin doesn't exist
> there) just jack in the USB<->MiniUSB cable. I get the same readings below
> on AC, on PC, and on DC. If I force charging to 500mA or 100mA then they
> reflect that.
>
> root at iota:~# cat
> /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/chgmode
> fast
> root at iota:~# cat
> /sys/devices/platform/s3c2440-i2c/i2c-adapter/i2c-0/0-0073/charger_type
> charger 1A mode 1A
If I understand you correctly, this sounds like a bug.
Let me confirm:
1. Disconnect your FreeRunner from any power source.
2. Power cycle (to clear any previous state).
3. Connect the FreeRunner to a PC USB port. We know these source at most
500mA.
4. Display (and report) chgmode.
Thanks,
Michael
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