Coding vs1005 by VLSI: use a Stepper motor as rotary encoder / using interrupts

Our project relates to vs1005 (All in one audio player on a chip) [login to view URL] by [login to view URL] in combination with the developer board. Programs are written using VLSI Solution's Integrated Development Environment VSIDE [login to view URL] We are coding a VS1005 and want to use a stepper motor as an encoder with force feedback. When you turn the wheel and reach a certain point the motor should react and brake for half a second. There is a template that does most of the things we want to. It is written in another coding language which might be transformed into VLSI language. Further more the VS1005 should use the interrupts to remark the signals and react. Here´s the link to the template: [login to view URL] (look at "[login to view URL]"). In the template they use an old floppy-disk motor. We would prefer a modern cheap stepper like those 4-wired mini-steppers: [login to view URL] We need an expert who is familiar with the vs1005 by VLSI and knows how to use the interrupts and who can transform the template or even code it better.