medium10 pts · first answer countsmicrocontrollersinterruptscritical-sections

Nested disable and enable of interrupts

Function f() calls __disable_irq(), does work, then calls __enable_irq(). It is called from code that has already disabled interrupts. What is the problem?

A.f() re-enables interrupts early, breaking the caller's sectionB.Interrupts stay disabled forever once f() has been calledC.The CPU resets when __disable_irq is called a second timeD.Nothing goes wrong, because the calls nest automatically

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Nested disable and enable of interrupts

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