Detect External Pin Interrupts with nRF51

[rushin]

Hello, I am using external interrupt from an ADXL345 . Can you tell me how to detect that external interrupt with the nRF51 ?

[bjorn-spockeli]

The following code will detect a Low-to-High transition on a given Interrupt Pin( needs to be defined by you).

GPIOTE Event Handler:

void gpiote_evt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    switch(action)
    {
        case NRF_GPIOTE_POLARITY_LOTOHI:
            //do something
            break;
        default:
            //do nothing
            break;
    }
}

Main Function:

int main(void)
{
    ret_code_t ret_code;
    
    ret_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(ret_code);
    
    nrf_drv_gpiote_in_config_t config =
    {
        .sense = NRF_GPIOTE_POLARITY_LOTOHI,
        .pull = NRF_GPIO_PIN_NOPULL ,
        .is_watcher = false,
        .hi_accuracy = false
    };
        
    
    ret_code = nrf_drv_gpiote_in_init(INTERRUPT_PIN, &config, gpiote_evt_handler);
    APP_ERROR_CHECK(ret_code);
    
    nrf_drv_gpiote_in_event_enable(INTERRUPT_PIN,true);
}

Update:

Project files for an example that toogles a led when a button is pressed

toggle_led_fixed.zip

[bjorn-spockeli]

It should compile just fine, regardless if it says that there is something in the include chain that is missing.