L9942 not working properly accoding to the sample

Hello

I'm a newer about stepping motor IC L9942

I compsed of L9942 Climate control Unit in HVAC .

Some devices have no problem when they are controlled by a program.

A specific device rotates discontinuously when it rotates.

I am looking for the cause of whether this is a program error or a circuit problem.

I wonder if the EVA board is made up of 6.8Kohm resistor (R8) for Rref, and what is the effect of lowering the resistance value?

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