Enumerates the PRU UIO Devices's on a BeagleBone Black.
public enum PRUUIODeviceEnum
{
PRUUIODEVICE_NONE,
PRUUIODEVICE_0,
PRUUIODEVICE_1,
PRUUIODEVICE_2,
PRUUIODEVICE_3,
PRUUIODEVICE_4,
PRUUIODEVICE_5,
PRUUIODEVICE_6,
PRUUIODEVICE_7
}