This is a bug report for SDK v15.3.
Once a GPIOTE interrupt is enabled for a pin, nrfx_gpiote_in_event_enable(pin, false) will not disable it. This appears to be an issue in nrfx_gpiote.c. Modifying the function as follows resolves the issue:
void nrfx_gpiote_in_event_enable(nrfx_gpiote_pin_t pin, bool int_enable)
{
NRFX_ASSERT(pin < NUMBER_OF_PINS);
NRFX_ASSERT(pin_in_use_by_gpiote(pin));
if (pin_in_use_by_port(pin))
{
uint8_t pin_and_sense = (uint8_t)
m_cb.port_handlers_pins[channel_port_get(pin) - GPIOTE_CH_NUM];
nrf_gpiote_polarity_t polarity =
(nrf_gpiote_polarity_t)(pin_and_sense >> SENSE_FIELD_POS);
nrf_gpio_pin_sense_t sense;
if (polarity == NRF_GPIOTE_POLARITY_TOGGLE)
{
/* read current pin state and set for next sense to oposit */
sense = (nrf_gpio_pin_read(pin)) ?
NRF_GPIO_PIN_SENSE_LOW : NRF_GPIO_PIN_SENSE_HIGH;
}
else
{
sense = (polarity == NRF_GPIOTE_POLARITY_LOTOHI) ?
NRF_GPIO_PIN_SENSE_HIGH : NRF_GPIO_PIN_SENSE_LOW;
}
nrf_gpio_cfg_sense_set(pin, sense);
}
else if (pin_in_use_by_te(pin))
{
int32_t channel = (int32_t)channel_port_get(pin);
nrf_gpiote_events_t event = TE_IDX_TO_EVENT_ADDR((uint32_t)channel);
nrf_gpiote_event_enable((uint32_t)channel);
nrf_gpiote_event_clear(event);
if (int_enable)
{
nrfx_gpiote_evt_handler_t handler = channel_handler_get((uint32_t)channel_port_get(pin));
// Enable the interrupt only if event handler was provided.
if (handler)
{
nrf_gpiote_int_enable(1 << channel);
}
}
// BEGIN BUGFIX
else
{
nrf_gpiote_int_disable(1 << channel);
}
// END BUGFIX
}
}
