Tools: added decode_devid.py

Tools/scripts/decode_devid.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+'''
+decode a device ID, such as used for COMPASS_DEV_ID, INS_ACC_ID etc
+
+To understand the devtype you should look at the backend headers for
+the sensor library, such as libraries/AP_Compass/AP_Compass_Backend.h
+'''
+
+import sys
+
+devid=int(sys.argv[1])
+
+bus_type=devid & 0x07
+bus=(devid>>3) & 0x1F
+address=(devid>>8)&0xFF
+devtype=(devid>>16)
+
+print("bus_type:%u  bus:%u address:%u devtype:%u(0x%x)" % (
+             bus_type, bus, address, devtype, devtype))
+
+
+