Accelerometer reading via USB control packets from the Motor interfac…

…e (libusb driver + python + pyusb)

libusbinfs/Xbox_NUI_Motor.cat

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+This file will contain the digital signature of the files to be installed
+on the system.
+This file will be provided by Microsoft upon certification of your drivers.

usbmotor.py

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+import usb.core
+import usb.util
+import sys
+import time
+
+# find our device
+dev = usb.core.find(idVendor=0x045e, idProduct=0x02B0)
+
+# was it found?
+if dev is None:
+    raise ValueError('Device not found')
+
+for cfg in dev:
+    sys.stdout.write("Configuration #"+str(cfg.bConfigurationValue) + '\n')
+    for intf in cfg:
+        sys.stdout.write('\tInterface #' + \
+                         str(intf.bInterfaceNumber) + \
+                         '\t, Alternate setting ' + \
+                         str(intf.bAlternateSetting) + \
+                         '\n')
+        sys.stdout.write("\tEndpoints:\n")
+        for ep in intf:
+            sys.stdout.write('\t\t' + \
+                             str(ep.bEndpointAddress) + \
+                             '\n')
+
+# set the active configuration. With no arguments, the first
+# configuration will be the active one
+dev.set_configuration()
+
+
+# test of reading data from different request #
+#bRequest = 8         # or 8 or 9
+#for i in range(255):
+#    try:
+#        ret = dev.ctrl_transfer(0x80, bRequest, i, 0, 4)
+#        print i,
+#        print ret
+#    except:
+#        # failed to get data for this request
+#        pass
+
+
+
+# (bmRequestType, bmRequestType, bmRequest, wValue, wIndex, nBytes)
+ret = dev.ctrl_transfer(0xC0, 0x10, 0x0, 0x0, 1)
+print hex(ret[0])   # should return 0x22 but dont know why ?
+
+while True:
+    # Get accel data
+    ret = dev.ctrl_transfer(0xC0, 0x32, 0x0, 0x0, 10)
+    #print map(hex, ret)
+
+    # bytes 0 & 1 are always zero
+
+    x = (ret[2] << 8) | ret[3]
+    x = (x + 2**15) % 2**16 - 2**15     # convert to signed 16b
+    y = (ret[4] << 8) | ret[5]
+    y = (y + 2**15) % 2**16 - 2**15     # convert to signed 16b
+    z = (ret[6] << 8) | ret[7]
+    z = (z + 2**15) % 2**16 - 2**15     # convert to signed 16b
+
+    print x, "\t", y, "\t", z
+