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DRV8818EVM: 电流波形有重叠是什么原因?

Part Number: DRV8818EVM
Other Parts Discussed in Thread: DRV8818

在我自己设计的板子,DRV8818设置1/8微步,Vdecay=2.6V,Vcc=5V,Rx=27K,Cx=680pF,SRn=0,STEP=4KHz

但是电机震大,噪音大,抓到的ISEN采样电阻的曲线如下:

请问这是什么原因导致的?要怎么解决?