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
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