embedded - How to disable nesting in NVIC Interrupts in ARM Cortex M0+? -


i have started using arm cortex m0+ gpio interrupts. want disable nesting feature arm interrupts. there way it.? know default, nesting enabled in arm, want disable it.

arm cortex-m0/m0+ not support interrupt priority grouping preemption priority(nestable) , sub-priority (non-nestable) available on m3/m4/m7 example.

if wish prevent interrupt nesting; necessary either;

  • set interrupts same priority, or
  • disable , re-enable interrupts on entry , exit handlers.

the first of these options simplest, gives no control on execution order (which seldom matters asynchronous events, may lead non-deterministic behaviour , timing). second not prevent nesting, allow nesting before lower-priority interrupt has disabled interrupts - before has started processing actual event. result behaviour similar of sub-priorities available on cortex-m3 etc.


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