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TMS320DM8147: How to implement 8147 interrupt

Part Number: TMS320DM8147

We'd like to set up a hardware interrupt (in C language) on the 8147 to simply monitor the state of a GPIO pin being used on the ARM side.  I've searched as well as looked at the TRM, but based on the enormous amount of information in the document, it would be extremely helpful to see an example of how it's done.  I should mention that we're using WEC7.  Thanks much.