HVX notification crashes when called from peripheral handler

RE: HVX notification crashes when called from peripheral handler

Nick_RA — Tue, 15 Sep 2020 18:18:55 GMT

Brilliant, thanks.

RE: HVX notification crashes when called from peripheral handler

Vidar Berg — Tue, 15 Sep 2020 14:34:55 GMT

Hi,

Yes, you can call NVIC_SetPriority() to change the priority as shown below:

  NRF_TIMER4->TASKS_CLEAR   = 1;
  NRF_TIMER4->BITMODE =     TIMER_BITMODE_BITMODE_32Bit;
  NRF_TIMER4->CC[0]         = 1000;
  NRF_TIMER4->SHORTS        = TIMER_SHORTS_COMPARE0_CLEAR_Msk;
  NRF_TIMER4->INTENSET      = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos);
  NVIC_SetPriority(TIMER4_IRQn, 6);
  NVIC_EnableIRQ(TIMER4_IRQn);
  NRF_TIMER4->TASKS_START = 1;

The default interrupt priority (reset value) is '0', and is reserved to the Softdevice. Hope this helps.

RE: HVX notification crashes when called from peripheral handler

Nick_RA — Tue, 15 Sep 2020 14:28:16 GMT

Hi Thanks for the quick reply..

I think I do have an IRQ issue. The UART was set to level 6 but was overridden when calling APP_UART_FIFO_INIT. I've reset it to 6 and the UART event handler works as expected.

For the timer, I'm currently not using the nrf drivers as the timer code was culled from an example ages ago (this project started out as a Manchester decoder) so it is setting registers directly.

Is there an easy way to set the IRQ priority for timer4? I think my next task should be to rewrite the timer routines...

  NRF_TIMER4->TASKS_CLEAR   = 1;
  NRF_TIMER4->BITMODE =     TIMER_BITMODE_BITMODE_32Bit;
  NRF_TIMER4->CC[0]         = 1000;
  NRF_TIMER4->SHORTS        = TIMER_SHORTS_COMPARE0_CLEAR_Msk;
  NRF_TIMER4->INTENSET      = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos);
  NVIC_EnableIRQ(TIMER4_IRQn);
  NRF_TIMER4->TASKS_START = 1;

Thanks

RE: HVX notification crashes when called from peripheral handler

Vidar Berg — Tue, 15 Sep 2020 08:33:26 GMT

Hello,

What's the interrupt priority of your UART handler and timer handler? It should be fine to call the HVX function from these if you are using the default priority which is '6'.