Radio notification init problem

[codezork]

I am trying the tutorial Radio Notification and was following the patch from Ble_radio_notification wont compile. The radio notification init comes right after the ble enabling:

// Initialize the SoftDevice handler module.
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
APP_ERROR_CHECK(ble_radio_notification_init(APP_IRQ_PRIORITY_LOW, 
                                            NRF_RADIO_NOTIFICATION_DISTANCE_800US, 
                                            ble_radio_notification_evt_handler));

Inside ble_radio_notification_init the function sd_nvic_EnableIRQ(SWI1_IRQn) fails. The check inside this function:

  if (!__sd_nvic_is_app_accessible_priority(NVIC_GetPriority(IRQn)))
  {
    return NRF_ERROR_SOC_NVIC_INTERRUPT_PRIORITY_NOT_ALLOWED;
  }

gets a strange value of 0x301 from NVIC_GetPriority(IRQn) which is recognized wrong in the following test. How does it come to such a value when processing:

((uint32_t)((NVIC->IP[ _IP_IDX(IRQn)] >> _BIT_SHIFT(IRQn) ) >> (8 - __NVIC_PRIO_BITS)));

Could it be some kind of environment setting which is wrong?

[codezork]

Thank you for your quick answer. I forgot to say that I am working on a nrf51422 which is Cortex-M0 based. And my core_cm0.h file looks like this:

__STATIC_INLINE uint32_t NVIC_GetPriority(IRQn_Type IRQn)
{

  if(IRQn < 0) {
    return((uint32_t)((SCB->SHP[_SHP_IDX(IRQn)] >> _BIT_SHIFT(IRQn) ) >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for Cortex-M0 system interrupts */
  else {
    return((uint32_t)((NVIC->IP[ _IP_IDX(IRQn)] >> _BIT_SHIFT(IRQn) ) >> (8 - __NVIC_PRIO_BITS)));  } /* get priority for device specific interrupts  */
}