How to differentiate which GPIO causing device to wake-up from System OFF

[beemavishnu]

Hello,

 

I am using nRF52832, SDK_15.3.0, S132 SoftDevice and Segger for flashing the image. I am using ‘ble_app_blinky’.

RESETREAS will give cause of reset. But for System OFF, is there any option to determine which GPIO causes device to wake-up from System OFF mode.

 

Thanks & Regards

Vishnu Beema

[beemavishnu]

Hi,

Still same issue. Please find below code. Any issues with this code.

Also I cant keep while() loop as you mentioned as I need to press for 2 seconds to validate debounce using RTC.

    for(i = 0; i < 32; i++)
    {
        bPinLatch = nrf_gpio_pin_latch_get(i);
        
        if(bPinLatch == 1)
        {
            uint32_t j, k, l;
            
            __NOP();
            __NOP();
            
            // The LATCH register will only be cleared if the CPU explicitly clears it by writing a '1'
            // to the bit that shall be cleared.
            nrf_gpio_pin_latch_clear(i);
            
            __NOP();
            __NOP();
            
            nrf_gpio_pin_latch_get(i);
            nrf_gpio_pin_latch_get(i);
            nrf_gpio_pin_latch_get(i);
            
            __NOP();
            __NOP();
            
            j = nrf_gpio_pin_latch_get(i);
            
            NRF_LOG_INFO("latchN %d %d", i, j);
        }
    }
    

Thanks & Regards

Vishnu Beema

[Håkon Alseth]

What likely happens is that the LATCH is cleared while the button is still active. This will then keep the signal set in the LATCH register, even after you cleared it, because it is still active. 

The while function was for testing purposes, to see if the problem would disappear. You can ofcourse implement this debouncing in any way you'd like, using a RTC or any other timer functionality.

 

Kind regards,

Håkon

[beemavishnu]

I got your point. Thank you for your inputs.