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 <e...@kapitein.org>: > > > 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.w...@canonical.com> >> >> 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@lists.launchpad.net > Unsubscribe : https://launchpad.net/~ubuntu-phone > More help : https://help.launchpad.net/ListHelp >
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