Using P0.26 with App Timer

[phipi]

I have an application that toggles an LED on P0.26 based on a timer and that's working fine. Now I need to add a few more timers so I decided to use the APP_TIMER library with the RTC, but when I make the call to nrf_drv_clock_lfclk_request(), I am no longer able to control P0.26. I see that this pin is connection for the 32kHz crystal but I don't actually have an external reference.

Do I still lose functionality of this pin even without an external crystal?

[phipi]

"Function for requesting LFCLK. LFCLK can be repeatedly requested.

If it is first request, selected LFCLK source will be started. The nrf_drv_clock_lfclk_is_running() function can be polled to check if it has started."

Any thoughts on what "requesting LFCLK" means exactly? Is this equivalent to enabling it?

Also, how do we specify "selected LFCLK source"?