RE: How to toggle the GPIO sense field?

Robert Blasutig — Fri, 13 Dec 2013 08:17:45 GMT

volatile bool reed2asserted = false;
void GPIOTE_IRQHandler(void)
{
  if (NRF_GPIOTE->EVENTS_PORT != 0)
  {
    NRF_GPIOTE->EVENTS_PORT = 0;
	
    if (nrf_gpio_pin_read(PIN_GPIO_REED2) && reed2asserted)
    {
      nrf_gpio_pin_toggle(LED1);
      reed2asserted = !reed2asserted;
      NRF_GPIO->PIN_CNF[PIN_GPIO_REED2] = 
        (GPIO_PIN_CNF_SENSE_Low << GPIO_PIN_CNF_SENSE_Pos)
        | (NRF_GPIO_PIN_PULLUP << GPIO_PIN_CNF_PULL_Pos)
        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);    
    }
    else if (!nrf_gpio_pin_read(PIN_GPIO_REED2) && !reed2asserted)
    {
      nrf_gpio_pin_toggle(LED1);
      reed2asserted = !reed2asserted;
      NRF_GPIO->PIN_CNF[PIN_GPIO_REED2] = 
        (GPIO_PIN_CNF_SENSE_High << GPIO_PIN_CNF_SENSE_Pos)
        | (NRF_GPIO_PIN_PULLUP << GPIO_PIN_CNF_PULL_Pos)
        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);    
    }
  }
}

RE: How to toggle the GPIO sense field?

Robert Blasutig — Fri, 13 Dec 2013 08:02:25 GMT

For those of us that don't think the solution is immediately obvious, I'll share some code that seems to get it to behave...

This is for a single IO. The app_gpiote code has more clever stuff that doesn't really make clear what needs to be done... at least to me. I guess an explanation is that overlapping GPIO port events cannot occur if the current pin level is the same as the current sense setting.