Read GPIO level without configuring Input or Output

[beemavishnu]

Hello,

 

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

 

I want to check for debounce of a level on pin for 2 sec and then only do further operations. If pin is high for 2 sec then only initialize other functionalities like BLE, SoftDevice, Timers, buttons, leds etc.. Otherwise go to System off mode.

 

1) Whether can I use nrf_gpio_port_in_read() even without configuring GPIO pins as input or output.

2) As per below link, whether can I skip initialization and do only after validating the pin for 2 seconds.

                https://devzone.nordicsemi.com/f/nordic-q-a/40043/low-power-with-rtc-and-ram-retention

 3) In this case I want to use RTC2 for debounce logic for 2 sec. I suspect only SoftDevice will enable low frequency clock. Do I need to call lfclk_config() (As in RTC example) explicitly.

 

Thanks & Regards

Vishnu Beema

[beemavishnu]

Please let me know inputs.

[Jared]

Hi,

1. Yes, you can read the registers without configuring the GPIO as input or output.
2. Yes, you don't have to initialize the module if you're not going to use it immediately. 
3. Correct, you would need to call lfclk_config() if you haven't initialized the Softdevice as the RTC hasn't been started yet. 

regards

Jared