Generate Events Continuously With BSP While Holding a Button Down?

RE: Generate Events Continuously With BSP While Holding a Button Down?

haakonsh — Fri, 30 Aug 2019 13:25:37 GMT

I suggest you start a timer on a pushed event, and in the timer callback you check if the button is still pressed with app_button_is_pushed. If so you call whatever function you want to periodically call then re-start the timer so that you create a non-blocking loop that periodically checks if the button is still pressed.

RE: Generate Events Continuously With BSP While Holding a Button Down?

BendaEng — Fri, 30 Aug 2019 13:21:17 GMT

Darn, I was thinking that I could maybe modify the bsp.c to include another event (other than APP_BUTTON_PUSH and APP_BUTTON_RELEASE, etc which would be APP_BUTTON_HOLD. Not sure if that is feasible though.

Do you think there is a way to use the Button Handling Library to trigger events continuously on a held button press? The only thing that caught my attention as a possible use was the following function within app_button.c, but I'm not sure how I could use that for generating continuous events by pressing and holding.

bool app_button_is_pushed(uint8_t button_id)
{
    ASSERT(button_id <= m_button_count);
    ASSERT(mp_buttons != NULL);

    app_button_cfg_t const * p_btn = &mp_buttons[button_id];
    bool is_set = nrf_drv_gpiote_in_is_set(p_btn->pin_no);

    return !(is_set ^ (p_btn->active_state == APP_BUTTON_ACTIVE_HIGH));
}
#endif //NRF_MODULE_ENABLED(BUTTON)

Thanks!

RE: Generate Events Continuously With BSP While Holding a Button Down?

haakonsh — Thu, 29 Aug 2019 07:32:07 GMT

Well, you only got two events to work with, pushed and released. I suggest you add a timer in the pushed event that times out after one second, that then periodically, like every 0.5seconds, check if the pin is still held in it's pushed state and if so, do the thing you want to do.

The BSP library is just intended to be used to run examples on the DK. In a real application, I would ditch the BSP in favor of the Button handling library (Button Handler, API). The BSP uses the button handling library as well, there's just a lot of abstraction on top of it.