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c2000控制电机ecap捕获编码器数据不正常

用的F280049控制无刷三相电机,与F28377类似,程序运行起来之后U V W不接电机,ecap获取编码器数据正常,编码器发的pwm脉冲。但是只要U V W连上电机ecap数据就不正常了,数据随机乱跳,示波器看编码器发出的pwm波形也非常乱,无法识别频率,编码器和dsp也共地了,请问有知道这是什么原因造成的吗?