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

[Wojtek]

If you have register NFCPINS enabled (i understand enabled = 1), then you cant use it as gpio...

[Thangaraj]

Hi Sorry, It is enabled as GPIO

[Wojtek]

how do you enable it? did you try using another pin? Just to make sure that the problem is elsewhere. 1us toggling should be easily achieved.

[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.

[Øyvind Karlsen]

The minimum time for GPIO toggling depends on the load capacitance (higher capacitance higher rise/fall time), the values are on a nanosecond scale and can be found in the electrical specification for the GPIO module.