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TMS320F28377S: Question about TMS320F28377S

Part Number: TMS320F28377S

Hello:

Hello, customer have encountered a problem recently, which may be related to the AD conversion of 28377S. Please help me analyze this problem.

AD sampling configuration is as follows

EPWM1 cycle interrupt and EPWM2 zero-crossing interrupt are set on the system, but when EPWM2 zero-crossing interrupt is involved, the relevant AD sampling value will have the following conditions (take AdcaResultRegs.ADCRESULT2 as an example)

LfScopeVbusAllAd is the value in AdcaResultRegs.ADCRESULT2, gfVbusAllReal is the corresponding physical meaning value after the AdcaResultRegs.ADCRESULT2 value is converted, and gfVBiDCReal is the value sampled during the EPWM1 cycle interruption. Why does the AD sampling value related to EPWM2 zero-crossing interrupt suddenly change to 0?


Another question is that the 28377s ADC-A channel seems to have the effect of conversion time. I tested that the same sampling is configured to A0 and A7, and the effect will be the same. At present, the conclusion is that the important sampling should be configured as far as possible. Although this solution has been found, what is the answer to this problem?