I want to detect signal from GPIO pins.

[stepan bokhanov]

I'm making keypad using nRF52840. SDK version is 17.0.2.

It's 4*4 keypad and I want to wake up device when any key is pressed from sleep and let it do any action.

So it has 4 rows and 4 cols. They are connected to GPIO pins.

I want to detect the event which is occurred when key is pressed.

Please help me.

Thanks.

[Jared]

Hi,

You can use the DETECT signal to wakeup the nRF from SYSTEM OFF sleep. Here is an example on how to implement it. When you wakeup you should read the latch to check which pin that was pressed, you can use the nrf_gpio_latches_read_and_clear().

regards

Jared