Need 16Mhz frequency on jetson nano GPIO pin

I am trying to achive 16Mhz frequency on jetson nano GPIO pin. I saw this code on github( where we can access directly GPIO from kernel. I am completely new on Jetso nano board so I don’t understand what pin they used in code to toggle LED on nanosecond delay with high frequncy. Anyone can help me to understand this code. What GPIO pin I have to use to achive 16Mhz frequnecy?

Twiter source :

Thanks in advance.

hello rxuser,

for your reference,
there’s a Python library, Jetson GPIO that enables the use of Jetson’s GPIOs.