A method for generating program code used to describe relationships between a plurality of function names and a plurality of control codes of a device. The method comprises receiving the relationships between the plurality of function names and the plurality of control codes, detecting if one of the function names corresponds to more than one control code and if one of the control codes corresponds to a plurality of function names. Program code is generated to describe the relationships if there are no multiple mappings between the control codes and the function names. A warning message is generated if there is function name corresponding to more than one control code or a control code corresponds to more than one function name.