I am learning some concepts of USB OTG recently. When surfing wikipedia,I came to know that, OTG supporting devices are playing dual role and it will have mini AB type receptacle or micro AB type receptacle.
To act as a host, the OTG supporting device must be connected with mini-A or micro-A cable. To act as a device, it needs to be connected with mini-B type or micro-B type cable.
Wikipedia says -
"The device with a mini-A plug inserted becomes an OTG A-device, and the device with a mini-B plug inserted becomes a B-device (see above). The type of plug inserted is detected by the state of the ID pin (the mini-A plug's ID pin is grounded, while the mini-B plug's is floating)."
But doubt comes when I come across this image I attached. It has mini-B type receptacle for it's audio system. In order to insert a pendrive, the user need to have an adapter which should have mini-B type on one end and standard A type on the other end. So, possibly the audio system in the car can only detects that mini B type cable is connected with it. If this is the case, the audio system is supposed to works as a device instead of host.
But, the audio system detects pendrive and starts to play music from it. This is a chevrolet beat car audio system. Is this contradictory to the theory said in wikipedia?
clear out this doubt please?