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Calling pvPortMalloc in an ISR

Why must pvPortMalloc not be called from an ISR with heap_4?

A.It always blocks for at least one tick before returningB.It allocates the memory from the ISR stack, not the heapC.It guards the heap by suspending the scheduler, which ISRs ignoreD.It only works before the scheduler has been started

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Calling pvPortMalloc in an ISR

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