2) Connect 2 boards with usb cable with one end is micro A plug, the other end
is micro B plug.
- The A-device(with micro A plug inserted) should enumrate B-device.
+ The A-device(with micro A plug inserted) should enumerate B-device.
3) Role switch
On B-device:
echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
- B-device should take host role and enumrate A-device.
+ B-device should take host role and enumerate A-device.
4) A-device switch back to host.
On B-device:
side by answering the polling from B-Host, this can be done on A-device:
echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
- A-device should switch back to host and enumrate B-device.
+ A-device should switch back to host and enumerate B-device.
5) Remove B-device(unplug micro B plug) and insert again in 10 seconds,
- A-device should enumrate B-device again.
+ A-device should enumerate B-device again.
6) Remove B-device(unplug micro B plug) and insert again after 10 seconds,
- A-device should NOT enumrate B-device.
+ A-device should NOT enumerate B-device.
if A-device wants to use bus:
On A-device:
On B-device:
echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
- A-device should resume usb bus and enumrate B-device.
+ A-device should resume usb bus and enumerate B-device.
1.3 Reference document
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