Interrupt Routine Rules

• Interrupt routines in RTOS must follow two rules that do not apply to task code:

  • An interrupt routine must not call any RTOS functions that might block.
    • could block the highest priority task
    • might not reset the hardware or allow further interrupts
  • An interrupt routine must not call any RTOS function that might cause the RTOS to switch tasks
    • causing a higher priority task to run may cause the interrupt routine to take a very long time to complete.