I cannot set gpio in interrupt funtion?example in examples/peripheral/pin_change_int?

[Liverpool007]

I want to set gpio using one interrupt and want to clear it using another interrupt funtion?

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    nrf_drv_gpiote_out_set(PIN_OUT);
}
/**
 * @brief Function for configuring: PIN_IN pin for input, PIN_OUT pin for output,
 * and configures GPIOTE to give an interrupt on pin change.
 */
static void gpio_init(void)
{
    ret_code_t err_code;

    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_SIMPLE(true);

    err_code = nrf_drv_gpiote_out_init(PIN_OUT, &out_config);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_LOTOHI(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;

    err_code = nrf_drv_gpiote_in_init(PIN_IN, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(PIN_IN, true);
}

It seems i can only use the toggle funtion ,if i use the nrf_drv_gpiote_out_set it does not set it.

[MartinBL]

Is there a reason why you use gpiote for the output pin?

Try something like this instead:

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    if(pin == PIN_SET)
    {
        nrf_gpio_pin_set(PIN_OUT);
    }
    else if(pin == PIN_CLEAR)
    {
        nrf_gpio_pin_clear(PIN_OUT);
    }
}

/**
 * @brief Function for configuring: PIN_IN pin for input, PIN_OUT pin for output,
 * and configures GPIOTE to give an interrupt on pin change.
 */
static void gpio_init(void)
{
    ret_code_t err_code;
    
    nrf_gpio_cfg_output(PIN_OUT);

    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_LOTOHI(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;

    err_code = nrf_drv_gpiote_in_init(PIN_SET, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_gpiote_in_init(PIN_CLEAR, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(PIN_SET, true);
    nrf_drv_gpiote_in_event_enable(PIN_CLEAR, true);
}

[Liverpool007]

I am little confused. If PIN_SET and PIN_CLEAR are two pins what is the value of (pin). and nrf_drv_gpiote_in_event_enable(PIN_SET,true) is used to set the interrupt.

[MartinBL]

'pin' is the pin number of the GPIO that triggered the GPIOTE interrupt.