Update README.md

README.md

@@ -1,5 +1,16 @@
 # microstrain_3dm_gx5_45
 
+
+
+## Description
+
+Interface software, including ROS node, for Microstrain 3DM-GX5-45.
+
+The interface makes use of the MIP SDK Version 1.1 from Microstrain to communicate with the device.  Includes the following applications:
+
+  * GX4-45_Test : A port of the executable that comes with the SDK including minimial changes in the way the serial port is specified.  Running {rosrun microstrain_3dm_gx5_45 GX4-45_Test /dev/ttyACM0 115200} should run the tests on a unit as a first step.
+  * microstrain_3dm_gx5_45 : ROS node
+
 ## Dependencies
 
  * serial: https://github.com/wjwwood/serial  - for now we build this from source in our catkin_ws
@@ -16,7 +27,7 @@ Here are the steps I took to build the code...
  * cd catkin_sw
  * catkin_make
 
- ## Dev Notes
+## Dev Notes
 
  The mip_sdk_user_functions are C functions that need to be called by various parts of the SDK.  The main purpose of these functions is to implement the platform-specific serial (RS232) port elements.  The prototype serial port open function takes the COM number as an integer input - which is clunky for Linux serial ports.  Changed this to take a string defining the port (e.g., /dev/ttyS0), but this necessitated also modifying the mip_sdk_interface.[ch] files, since this is what is called by the application - changed the mip_interface_init function to accept a string argument for specifying the port.