attempt to divide by zero

Just to clarify in the gcode you uploaded I see: not
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hello ,
after many hours and test , it' s same result ,I do not know what to try
regards
jd

Did you try the modified code I posted (it seemed to work in my simulation.)

yes but is not ok , i make a another gcode.
thanks

I think that the G-code test is the way to go.
G-code access to HAL pins is slightly unreliable if the value changes after the G-code starts to run.

I probably wouldn't send an error message for [divisions LE 0], I think I would just default to 6 or some other sensible number.