applied IchGuckLive's CRC changes
applied IchGuckLive's CRC changes

asmuelle/heekscnc,asmuelle/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc,satovey/heekscnc,satovey/heekscnc,jihyun-kim/heekscnc,jihyun-kim/heekscnc,asmuelle/heekscnc,jihyun-kim/heekscnc,satovey/heekscnc,satovey/heekscnc