Hi Brian, I'm looking into this for you. After looking into the cmsis_ccs.h file, I see there is no declaration of the __ISB() function. Can I ask why you need to use this function? Most likely it's not included because the compiler may automatically include it, but this an assumption. In the meantime, you can use __asm(" isb") to call the function. Best regards, Caleb Overbay
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