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TMS320F28377D: QEP计数值突然异常的问题

Part Number: TMS320F28377D

DSP中的QEP解码好像会出现异常,按道理QEP计数值会一直增加,但是读取结果发现是会突然降低然后再增加,请问有什么方法解决吗?

第一张图是存储EQEP_getPosition(QEP1_device)的返回结果,也就是EQP1的计数值; QEP初始化代码是第二张图。用示波器测量QEP1的AB通道是正常的,QEP1的方向也是正常的