hard20 pts · first answer countsinterruptsmcu-architecture

ISR runs twice per event

An ISR clears the peripheral's interrupt flag as its very last instruction. On a fast Cortex-M7, the ISR often runs a second time with no new event. What is the fix?

A.Make the ISR longer by adding a delay at the startB.Clear the flag earlier, or read it back / use a DSB after clearing, so the write completes before exception returnC.Lower the interrupt priority to the minimumD.Disable the interrupt in the NVIC and never re-enable it

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ISR runs twice per event

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