RE: GPIOTE IN Event not triggering PPI task

digitalnyx — Wed, 04 Apr 2018 18:18:31 GMT

Of course it had to be that simple.

Thanks!

RE: GPIOTE IN Event not triggering PPI task

FormerMember — Wed, 04 Apr 2018 13:33:19 GMT

I would think the problem is that the GPIOTE event address is assigned to the PPI channel before the GPIOTE IN event is intialized. I would think you should do something like this:

// 1) Initialize the sense line (gpiote):

// Initialize and enable then sense line (high to low)
  sense_cfg.pull = NRF_GPIO_PIN_NOPULL;
  nrf_drv_gpiote_in_init(TEMP_SENSE_LINE, &sense_cfg, sense_dummy_handler);


// 2) Assign the initialized GPIOTE event to a PPI channel.

// Configure a PPI channel to stop the discharge timer whenever a sense line goes low
  nrf_drv_ppi_channel_alloc(&ppi_2);
  nrf_drv_ppi_channel_assign(ppi_2, 
                             nrf_drv_gpiote_in_event_addr_get(TEMP_SENSE_LINE), 
                             nrf_drv_timer_task_address_get(&discharge_timer, NRF_TIMER_TASK_CAPTURE0));
  
  ....

Also, remember to check and handle all error codes!