GPIO set time

[Thangaraj]

NRF52,S132 soft device, I am trying to toggle GPIO 10 (NFC pins Enabled as GPIO)in a 1us Timer, But its not happening , What may be the issue? Am using Timer 4. What is the minimum time taken on GPIO toggling

[RK]

if you're using a PCA10040 dev kit not only do you have to enable the pins as GPIOs, you have to remove two resistors and add two other resistors as the GPIO pins on the board aren't actually connected until you do.