Update README.md

README.md

@@ -16,4 +16,7 @@ Here are the steps I took to build the code...
  * cd catkin_sw
  * catkin_make
 
+ ## 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.