TI TMS320C64xx : add a PRD function

I have to add a function that will run every specified period. it seems straight forward as Code composer has a GUI tool to do that : DSP/BIOS Condig->PRD->

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in the properties form I can fill in the function name that gets called with every clk interrupt, but the GUI rejects my functions as "undefined labels'

the function I want to call is a C++ static function : static void MyClass::func1()

what am i missing here ?

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You definitely need to have it be an extern "C" function.