RE: NVIC check if IRQ is enabled

Turbo J — Thu, 03 Aug 2017 10:59:01 GMT

No, NVIC_GetActive() will only return 1 when the interrupt is currently being serviced (directly or preempted by a higher priority). So it should always return zero in main() funtion.

You are probably looking for the NVIC_GetEnableIRQ() function.

Note that both functions do not work with negative IRQn like SysTick.

RE: NVIC check if IRQ is enabled

NewtoM — Thu, 03 Aug 2017 10:54:51 GMT

Ok,

I've found out that I work with CMSIS v4.30, which does not have the required method yet. As far as I see, CMSIS v5.0.1 already has a function called NVIC_GetEnableIRQ() (see here).

So, I decided to borrow the implementation of that function, as seen below. Cited from github.com/.../core_cm4.h (as of 2017-08-03):

/**
  \brief   Get Interrupt Enable status
  \details Returns a device specific interrupt enable status from the NVIC interrupt controller.
  \param [in]      IRQn  Device specific interrupt number.
  \return             0  Interrupt is not enabled.
  \return             1  Interrupt is enabled.
  \note    IRQn must not be negative.
 */
__STATIC_INLINE uint32_t __NVIC_GetEnableIRQ(IRQn_Type IRQn)
{
  if ((int32_t)(IRQn) >= 0)
  {
    return((uint32_t)(((NVIC->ISER[(((uint32_t)(int32_t)IRQn) >> 5UL)] & (1UL << (((uint32_t)(int32_t)IRQn) & 0x1FUL))) != 0UL) ? 1UL : 0UL));
  }
  else
  {
    return(0U);
  }
}

Thanks for your time, Tamas