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TMS320F28P650DK: ADCC sampling result is always 0 while ADCA and ADCB is working correctly

Part Number: TMS320F28P650DK


Tool/software:

Using ADC sampling A0/B0/C0, all three ADCs are powered on when initialized, the configured trigger source is the same, and the check registers are also written into the registers during online debugging, and the external reference voltage is common 3.3V. However, the ADC AB result register is correct, but the ADC C result register is always 0.

Can someone tell me why?