hi.. i am trying to use an s-function to build a block in simulink for phidgets encoder

I have the matlab code (both m file and c file) for phidget encoder. I am trying to make an s-function for the phidgets with the help of matlab level 2 s-function template but i am unable to do it.Can anyone pl tell me how to make it. I went through the mathworks documentation for making a s-function and also the default programs like timestwo etc.But still even after doing in the similar way i am unable to get the block for phidgets encoder. Please help me out..

Thanks, Shruthi

[Kaustubha Govind]

Please explain what you mean by "unable to get the block". Do you get incorrect results or an error?