micro-Sleep for raspberry Pi

[emjtech]

Hi
I need to add a small delay on Raspberry Pi 3B+ (to allow an external data bus to stabilize) 1 uS will be enough.
Is there some simple procedure like
uSleep(t)
being t miroseconds (or nanoseconds) ?
or I need to write one?
If I need to write one can anyone recommend the simplest way ?
Thanks.

[Thaddy]

Use the fpsystem unix call for the linux kernel nanotimer. I will add a small example later. Note this will likely loose precision over longer periods of time (larger than a second).

[jamie]

1 us isn't much..

just execute some code between 

[emjtech]

Thaddy thanks, I will look for it, if you have an example it will be great
jamie thanks, that is exactly what I did , I calibrated that in a Raspberry Pi 3B+ the loop

for i:= to oneMicro do;

takes approximately 1uS for oneMicro:=17;

but I don't fill great about that because :
1-is not precise
2-it needs a different calibration value if I use a different machine ,for example  Raspberry Pi 3B (no +)

[AlexTP]

You have GetTickCount64, call it in loop until enought ticks.

[Thaddy]

You have GetTickCount64, call it in loop until enought ticks.

GetTickCount64 is too low resolution for micro timing.

[engkin]

What about fpNanoSleep?