I just stripped the original code by removing SNR calculation related functions and ran on CM403 EZ-KIT. It worked fine without any problem. I applied sine wave of 1KHz 2Vpp at J9.1 (ADC0_VIN00) and could see sine wave samples in ADC_Data buffer.Can you run this code on your board to check if it works for you?
Also, let me know the exact part number of processor.