patacongo commented on issue #2751:
URL: 
https://github.com/apache/incubator-nuttx/issues/2751#issuecomment-768321262


   What the op is seeing here is not normally timer behavior.  It is a 
consequence of running the setup up the timer consistent in phase the system 
time and, hence, experience the maximum error every time.  If the timer is set 
up a random phase with respect to the system timer, then removing the +1 would 
introduce serious, subtle errors.  The +1 was added to fix those errors.


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