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External Interrupt F28335

Hi,

I am trying to use the external interrupt to trigger ADC conversion in F28335. I configured GPIO10 as the source for the external interrupt 2 with the configuration as in the sample code. However, the interrupt is always triggered without any input trigger signal. I tried with other GPIOs, the same situation repeats. 

Is there anyone could help me figure this out?

Thanks and Regards,

Xiong