8824 output motor current abnormal

Why 8824 EVM output current is not a smooth sine wave?

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I use other drive IC, the current is a smooth sine wave(the same setting for 8 microstep)

please tell me why?

Need speical setting?

or This 8824 always output abnormal sine wave?

Is there any other side effect because of this not smooth sine wave?

Thanks for your support~~~~~

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