K 10
svn:author
V 3
ian
K 8
svn:date
V 27
2017-03-19T21:28:37.732847Z
K 7
svn:log
V 448
Eliminate unnecessary read/modify/write sequences during eventtimer setup.

It turns out to be surprisingly expensive to access the gpt hardware (on the
order of 150ns per read/write).  To cut down on the overhead of setting up
each eventtimer event, eliminate read-modify-write sequences to manage the
compare interrupt enable, by keeping a shadow copy of the hardware register
and only writing to the hardware when the enable bits really change.

END