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OLIMEX© 2015
There are two parts of a successful OTG device/host mode switch and usage – hardware part and
software part.
The hardware part is the cable – to use the OTG as a host you would need a mini USB to USB
adapter cable. Do not confuse micro and mini USB!
The software part is loading a kernel module responsible for the behavior of the board while in
device mode. If such software is not enabled or missing in the official distribution – you would
need, respectively, either to load the module or rebuild the kernel to enable the module. There are
several modules that you might need depending on what your goals are.
USB_OTG connector
Pin #
Signal name
1
+5V_OTG_PWR
2
UDM0
3
UDP0
4
USB0-IDDET
5
GND
The connector case is also grounded.
Processor pin
-
N20
N21
B5
-
Page 32 of 56
A20-OLinuXino-MICRO user's manual
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