Short delay

[Max Kriegleder]

Hi All,

For a specific use case I need to delay execution on the the order of 
100 - 10000 us. The obvious choice would be usleep however I noticed 
that depending on the platform I get something like 124-140 us instead 
of 100 us delay. I have created an issue on github for this 
https://github.com/apache/nuttx/issues/8207, but I think I understand by 
now why usleep cannot achieve what I am looking for - at least in the 
current implementation. I guess I need something along the lines of an 
alarm with very short alarm periods.

I am using the tickless OS setting with 1 USEC_PER_TICK and ultimately I 
want to control a stepper motor where I need to delay toggling of pins 
for very short and accurate amounts of time to achieve a certain 
movement profile of the motor - just for information, maybe I am 
thinking in the wrong direction.

Thanks!
Max