RTEMS C User's Guide
The rtems_timer_reset directive is used to restore an
interval timer initiated by a previous invocation of
rtems_timer_fire_after to
its original interval length. If the
timer has not been used or the last usage of this timer
was by a rtems_timer_fire_when directive, then an error is
returned. The timer service routine is not changed or
fired by this directive.
RTEMS C User's Guide
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