o file is object file. it is compiled file with extension ".o".
this allows you to extend functionality of KSS
if you wish to use it, some configuration is needed and in this case that would be name of o-file
thank you ,but still I can not really understand ,when we configure this external module,can you give me a example roughly,according what to modify this O-FILE[],also IOdriver and IOdrvname in the attachment picture.after finish this ,then we can cread and cwrite from/to LD-EXT-OBJ ,receieve or send data to external module like a camera.