Advertise when pin high. Do not advertise when pin is low.

[Adam Westbrook]

Hello community

I want to advertise when physical pin 0.24 is high, and stop advertising when pin 0.24 is low. For this, I based my code on the Beacon Transmitter Sample Application and looking at the Pin Change Interrupt Example.

Right now, I am trying to solve this using 2 interrupts. When pin 0.24 goes from low to high --> start transmission. When pin 0.24 goes from high to low --> stop transmission. But for some reason this code is not working as I expect it to work. When I run my code, the LED on my device is just blinking rapidly, which means that an interrupt is constantly happening I think (even though pin 0.24 remains untouched).

The most important lines of my code: (Here I configure and define my 2 handlers)

#define PIN_IN NRF_GPIO_PIN_MAP(0,24)


// BUTTON handler 1 to start advertising
void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    ret_code_t err_code;
    if(!is_advertising){ 
        err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
        APP_ERROR_CHECK(err_code);
        NRF_LOG_INFO("Starting advertising");
        is_advertising = true;
        nrf_drv_gpiote_out_set(PIN_OUT);  // LED blink
    } else{
        NRF_LOG_INFO("Already advertising");
    }
}

// BUTTON handler 2 to stop advertising
void in_pin_handler2(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    ret_code_t err_code;
        if(is_advertising){
        err_code = sd_ble_gap_adv_stop(m_adv_handle);
        APP_ERROR_CHECK(err_code);
        NRF_LOG_INFO("Stopping advertising");
        is_advertising = false;
        nrf_drv_gpiote_out_clear(PIN_OUT); //LED blink
    }else{
        NRF_LOG_INFO("Is not advertising");
    }
}

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(false);

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

    //handler 1 (to start advertising)
    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(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);

    //handler 2 (to stop advertising)
    nrf_drv_gpiote_in_config_t in_config2 = GPIOTE_CONFIG_IN_SENSE_LOTOHI(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;
    err_code = nrf_drv_gpiote_in_init(PIN_IN, &in_config2, in_pin_handler2); 
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(PIN_IN, true);
}

Does anyone know why this is not working as expected? Is it maybe not allowed to have 2 interrupts on one pin?

Thanks a lot

[Adam Westbrook]

EDIT: I just solved it by defining a second pin '#define PIN_IN NRF_GPIO_PIN_MAP(0,20)'.

Then I just assigned the high to low interrupt to this pin.