Sleep on long button press wakes up automatically

[Eddie]

Hi

Using an nRF52832 and SDK11, I have the following issue:

I want to use button 0 with a regular push for functionality and a long press to go to sleep. The detection of long and short pushes work, and the button is configured to cause a wakeup. Problem is that when going to sleep during a long press, the system automatically powers back up due to the button still being pressed.

Is there any way to avoid the wakeup when the button is still pressed and wait till a new flank (so first release, then push again)

Here's my relevant code:

static void buttons_leds_init(bool * p_erase_bonds)
{
    bsp_event_t startup_event;

    uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
                                 APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), 
                                 bsp_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ble_init(NULL, &startup_event);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_event_to_button_action_assign(0, BSP_BUTTON_ACTION_LONG_PUSH, BSP_EVENT_LONG_KEY_0);
    APP_ERROR_CHECK(err_code);

    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}

void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {   case BSP_EVENT_KEY_0:
        {
            someFunction();
            break;
        }
        case BSP_EVENT_LONG_KEY_0:
        {
            sleep_mode_enter();
            break;
        }

        default:
            break;
    }
}

static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}

[Susheel Nuguru]

The button handler which uses GPIOTE driver underneath is configured to wakeup only at any edge , that is rising or falling edge of button input. So as long you are not releasing the buttin it should be asleep as the GPIOTE is not level trigerred. I tried you example it worked perfectly OK for me, i mean after the long press, the system went to system_off stayed there until i released the button.

Note that in debug mode you cannot know that the device went to system off or not (check the Emulated system off mode that works in debug mode).

[Eddie]

It makes sense that it would only wakeup at an edge. So I'm at a loss why it is powering back up right away in my case. I'm using the development kit with the first button. I've even tried a different button and different boards. Is there a way to check why it is waking up?

[Susheel Nuguru]

how are you verifying that the system is waking? can you attach your project as you are testing this on development kit, it will be easy for me to test and see what else is going on.

[bds]

I have exactly the same problem. Reproducing the problem:

• default ble_app_uart example code from ble peripheral example

• change:

define BTN_ACTION_SLEEP BSP_BUTTON_ACTION_RELEASE

to

define BTN_ACTION_SLEEP BSP_BUTTON_ACTION_LONG_PUSH

in bsp_btn_ble_c

• sd_power_system_off() does not seem to work anymore (advertising indication LED stays blinking)

[bds]

BTW serveral other responses on this board seem to indicate that wakeup is always level triggered and not edge triggered. Can you verify this Aryan?