habe jetzt mal bisschen gesucht..
das englische wikipedia gibt für USB On-The-Go folgendes an:
grounded: A-device, acts as the default host
floating: B-device, acts as the default peripheral
Three additional ID pin states are defined at the nominal resistance
values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin.
- A charger and either no device or an A-device that is not asserting
VBUS (not providing power) are attached. The OTG device is allowed to
charge and initiate SRP but not connect
- A charger and an A-device that is asserting VBUS (is providing power)
are attached. The OTG device is allowed to charge and connect but not
initiate SRP
- A charger and a B-device are attached. The OTG device is allowed to
charge and enter host mode
als Referenz wird sich allerdings auf folgendes bezogen:
Battery Charging Specification (Rev 1.1)
- 124 kΩ / ACA ID pull-down, OTG device as A-device
- 68 kΩ / ACA ID pull-down, OTG device as B-device, can't connect
- 36.5 kΩ / ACA ID pull-down, OTG device as B-device, can connect
funktioniert jedoch bei mir alles nicht :(