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TMS320F28377S: AD采样故障

Part Number: TMS320F28377S

AD采样配置如下:


系统上设置EPWM1周期中断,EPWM2过零中断,但在涉及EPWM2过零中断时,相关的AD采样值会出现以下情况(以AdcaResultRegs.ADCRESULT2为例)。

问题一:

AdcaResultRegs.ADCRESULT2中的值突变为0。

问题二:

绿色为AdcaResultRegs.ADCRESULT7对应的采样,通过模拟开关进行二选一采样,但将AdcaResultRegs.ADCRESULT0与AdcaResultRegs.ADCRESULT7对换后,采样不在耦合,A组通道好像存在转换时间影响。目前测下来,结论是重要的采样尽量往前配置,虽然找到了这种解决方法,但是就该问题有什么说法么?