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When running your code, the ADC2 is triggered (G1INTFlg=0xA) continuously, since ADC1 has higher priority, ADC2 doesn't get serviced. Reading ADC1 results of 7 channels may take more than 9us, this means that ADC1 is get serviced all the time.
I increased the period of the triggers for ADC1 and ADC2, ADC2 ISR is serviced without any issue.
