GPIO Interrupt not triggered

[Hieu]

I am trying to set up a button interrupt by adding the following functions:

void button_interrupt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    nrf_gpio_pin_toggle(LED_4);
}

void button4_config()
{
    nrf_drv_gpiote_in_config_t config;
    memset(&config, 0, sizeof(nrf_drv_gpiote_in_config_t));
    config.sense = NRF_GPIOTE_POLARITY_HITOLO;
    config.pull = NRF_GPIO_PIN_NOPULL;
    config.hi_accuracy = false;
    config.is_watcher = false;
    
    nrf_drv_gpiote_in_init(BUTTON_4, &config, button_interrupt_handler);
    nrf_drv_gpiote_in_event_enable(BUTTON_4, true);
    
}
int main(void)
{
    // ...
    button4_config();
    // ...
}

When I tried to press the button, my interrupt is never called. Not even once.

Thinking that maybe the problem is because I was using BUTTON_4, I have also tried to replace it with pin 29 and use an external button. That doesn't work either.

What could I be missing?

[Petter Myhre]

I can't see that you are calling nrf_drv_gpiote_init() anywhere

Edit 1: Try this:

void button_interrupt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    nrf_gpio_pin_toggle(LED_4);
}

static void button4_config()
{
    nrf_drv_gpiote_in_config_t config;
    memset(&config, 0, sizeof(nrf_drv_gpiote_in_config_t));
    config.sense = NRF_GPIOTE_POLARITY_HITOLO;
    config.pull = NRF_GPIO_PIN_PULLUP;
    config.hi_accuracy = false;
    config.is_watcher = false;

    nrf_drv_gpiote_in_init(BUTTON_4, &config, button_interrupt_handler);
    nrf_drv_gpiote_in_event_enable(BUTTON_4, true);

}

/**
 * @brief Function for application main entry.
 */
int main(void)
{
    ret_code_t err_code;

    nrf_gpio_cfg_output(LED_4);
        
    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);

    button4_config();

    while (true)
    {
    }
}

[FormerMember]

The easiest way is to just change the number of buttons and LEDs defined in pca10028.h.

If you want to keep pca10028.h unmodified, you can do the following:

1. Copy pca10028.h and create a new pca10028 board file: my_board.h

2. Change the number of buttons/LEDs.

3. In the top of my_board.h, change the define to f.ex:

   #ifndef MY_BOARD_H #define MY_BOARD_H

4. Add my_board.h to the list of boards in boards.h (named f.ex: BOARD_MY_BOARD)

5. In project ->options for target -> C/C++ -> "define": replace BOARD_PCA10028 with BOARD_MY_BOARD