button push and release events

[jawadk]

Hi,

to initialize  the button properly

to trigger the push event on button push and the release event on button release, do I just have to change the button active state, if not how can i control it !?

/**@brief Button configuration structure. */
typedef struct
{
uint8_t pin_no; /**< Pin to be used as a button. */
uint8_t active_state; /**< APP_BUTTON_ACTIVE_HIGH or APP_BUTTON_ACTIVE_LOW. */
#if defined(BUTTON_HIGH_ACCURACY_ENABLED) && (BUTTON_HIGH_ACCURACY_ENABLED == 1)
bool hi_accuracy; /**< True if GPIOTE high accuracy (IN_EVENT) is used. */
#endif
nrf_gpio_pin_pull_t pull_cfg; /**< Pull-up or -down configuration. */
app_button_handler_t button_handler; /**< Handler to be called when button is pushed. */
} app_button_cfg_t;

when the button push switch the analog input from 0 to 1 have to be initialized as follows : 

#ifdef BSP_BUTTON_0
{BSP_BUTTON_0, true, BUTTON_PULL, bsp_button_event_handler},
#endif // BUTTON_0

and when the button push switch the analog input from 1 to 0 have to be initialized as follows : 

#ifdef BSP_BUTTON_0
{BSP_BUTTON_0, false, BUTTON_PULL, bsp_button_event_handler},
#endif // BUTTON_0

[Håkon Alseth]

Hi,

 

BSP depends on a module named app_button, and BSP does not send the PUSH and RELEASE event, but app_button does.

I would recommend that you, instead of using BSP, implement app_button directly in your application. Here's an example:

static void button_evt_handler(uint8_t pin_no, uint8_t button_action)
{
    switch (pin_no)
    {
        case MY_BUTTON:
        {
            if (button_action == APP_BUTTON_PUSH)
            {
                /* Button pushed */
                do_something();
            }
            else 
            {
                /* APP_BUTTON_RELEASE */
                do_something_else();
            }
        }
        break;
        default:
        break;
    }
}

static void buttons_init(void)
{
   // The array must be static because a pointer to it will be saved in the button library.
    static app_button_cfg_t buttons[] =
    {
        {MY_BUTTON, true, BUTTON_PULL, button_evt_handler},        
    };

    ret_code_t err_code = app_button_init(buttons, ARRAY_SIZE(buttons), BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
    
    /* You can call this other places as well, for instance when you get BLE_GAP_EVT_CONNECTED */
    err_code = app_button_enable();
    APP_ERROR_CHECK(err_code);
}

 

Kind regards,

Håkon

[jawadk]

Hi Hakan,

thanks for your reply.

I will ask my question in other way

when i configure my button as 

{MY_BUTTON, true, BUTTON_PULL, button_evt_handler},  ?

and when I configure it as :

{MY_BUTTON, false, BUTTON_PULL, button_evt_handler}, ?

[Håkon Alseth]

What you are setting there is the sense of the button:

#define APP_BUTTON_ACTIVE_HIGH 1                               /**< Indicates that a button is active high. */
#define APP_BUTTON_ACTIVE_LOW  0                               /**< Indicates that a button is active low. */

 

If your button is active low, set it to "false". If active high, set it to "true".

 

To address your question: The app_button library will provide an event when button is pushed, and when it is released. No need to do anything else than what is provided underneath.

 

Kind regards,

Håkon