external interrupt on nrf51822

[rushin]

hello there i want to generate external interrupt from adxl345.can you help me? can we do same like we are using with button??

[rushin]

...

    static void button_event_handler(uint8_t pin_no, uint8_t button_action)    
    {    
        uint32_t err_code;    

        switch (pin_no)
        {
            case LEDBUTTON_BUTTON_PIN:
                err_code = ble_lbs_on_button_change(&m_lbs, button_action);
                if (err_code != NRF_SUCCESS &&
                    err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                    err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
                break;

            default:
                APP_ERROR_HANDLER(pin_no);
                break;
        }
    }


    /**@brief Function for initializing the button handler module.
     */
    static void buttons_init(void)
    {
        uint32_t err_code;

        //The array must be static because a pointer to it will be saved in the button handler module.
        static app_button_cfg_t buttons[] =
        {
            {LEDBUTTON_BUTTON_PIN, false, BUTTON_PULL, button_event_handler}
        };

        err_code = app_button_init(buttons, sizeof(buttons) / sizeof(buttons[0]),
                               BUTTON_DETECTION_DELAY);
        APP_ERROR_CHECK(err_code);
    }

[rushin]

i think this code is useful for me.but i can't understand it. can anyone explain me how button_event_handler is used in buttons init function??

here they don't use two arguments like uint8_t pin_no, uint8_t button_action. can anyone explain me??

[rushin]

i can't solve my this doubt. can anyone help me??

[Stefan Birnir Sverrisson]

Hi rushin

Would this button press solution be useful to you, or do you want to use app_button directly?

By the way, what nRF51 SDK version are you using?

All that a button does is to change the voltage level on a GPIO pin to generate an interrupt. If an external circuit also changes the voltage level in the same way as a button does, you can use the same button code to detect an interrupt from an external circuit, as e.g. the adxl345.

Update 8.1.2016 To use app_button, you need to initialize app_timer and app_gpiote, because app_button uses those libraries internally. A good app_button code example is available on Github. The example is for nRF51 SDK 8.0.0 but it should also work for nRF51 SDK 10.0.0

[rushin]

i am using nrf51 SDK10