ubuntu-phone team mailing list archive

[Marius Gripsgård <mario.grip@xxxxxxxxx>]

Hi Ed,

Have you tried to edit "max_usb_current" in /boot/config.txt?

Try to set it to 1 or something.

Example:
max_usb_current=1

also check if your power supply delivers enough power.

Best regards,
Marius


2015-09-14 21:42 GMT+02:00 Ed Kapitein <ed@xxxxxxxxxxxx>:

>
>
> On 9/12/2015 3:10 PM, Stephen M. Webb wrote:
>
>> On 15-09-12 08:11 AM, Ed Kapitein wrote:
>>
>>> Hi,
>>> i want to use a raspberry pi to charge the BQ 4.5, without a (powered)
>>> hub.
>>> The BQ is not charging when i plug it into the pi, and the pi never
>>> enumerates the BQ on its usb bus.
>>>
>> Sounds like they're both OTG connections, each waiting for the other to
>> assert host mode.
>>
>> It's possible neither device has a kernel that supports host mode on the
>> OTG port:  you can check on the devices using
>> the command line 'grep CONFIG_USB_OTG /boot/config-$(uname -r)'.  In
>> particular, this is required on the Pi, which has a
>> USB Standard-A connector so needs to play the host.
>>
>> It's also very possible you're using a regular USB cable and not an OTG
>> cable, so host-slave nego never happens and
>> they're both waiting in slave mode for the other device to assert
>> dominance through hardware signalling.  See the
>> Wikipedia entry https://en.wikipedia.org/wiki/USB_On-The-Go for a
>> detaied description.
>>
>> --
>> Stephen M. Webb  <stephen.webb@xxxxxxxxxxxxx>
>>
>> Hi Stephen,
>
> Thanks for your toughts. The BQ does charge from a host that has
> CONFIG_USB_OTG=N and with an ordinary micro USB cable.
> Just to be sure i used a OTG cable, but that did not work with the pi.
> Any idea if/how you can force either device into slave mode?
>
> Kind regards,
> Ed
>
>
>
> --
> Mailing list: https://launchpad.net/~ubuntu-phone
> Post to     : ubuntu-phone@xxxxxxxxxxxxxxxxxxx
> Unsubscribe : https://launchpad.net/~ubuntu-phone
> More help   : https://help.launchpad.net/ListHelp
>