How do I handle register rollover for xPC Target encoder blocks?
I am using xPC Target Encoder blocks in my Simulink model. I would like to know how to handle potential register rollover.
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This enhancement has been incorporated in Release 2006a (R2006a). For previous product releases, read below for any possible workarounds:
Encoder boards have a fixed size counter register of 16 bits, 24 bits, or 32 bits. Regardless of the size, the register always eventually overflows and rolls over. This can happen in either the positive or negative direction.
Some boards provide a hardware mechanism to account for overflows or rollovers. As a best practice, you should design your model to always deal with overflows or rollovers. An initial count can handle the issue for some applications.
To handle register rollovers, you can use standard Simulink blocks to design the following counter algorithm types:
Rollover Counter — Count the number of rollovers
Extended Counter — Provide an extended counter that is not limited by register size
The attached files contain example Rollover Counter and Extended Counter blocks (handle rollover in positive direction).
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