RE: Interrupt on falling edge

Einar Thorsrud — Thu, 30 Apr 2020 08:54:23 GMT

Hi,

The second parameter to nrf_drv_gpiote_in_init() is of type nrf_drv_gpiote_in_config_t, and this configures the the interrupt generation. You should configure it with one of three macros:

GPIOTE_CONFIG_IN_SENSE_HITOLO to get an interrupt when the input goes from high to low (falling edge)
GPIOTE_CONFIG_IN_SENSE_LOTOHI to get an interrupt when the input goes from low to high (rising edge)
GPIOTE_CONFIG_IN_SENSE_TOGGLE to get interrupts on both edges.

So in practice, you just need to change your code to something similar to this:

    nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
    err_code = nrf_drv_gpiote_in_init(p_btn->pin_no, &config, gpiote_event_handler);
    VERIFY_SUCCESS(err_code);