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Hope you can help me to solve the problem
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The Terasic AD/DA card has input transformers. I have not looked at the documentation, but I suspect you need to input a signal with a frequency of a few MHz (I'd start with 10MHz) before you will see the ADC samples change. Do not route the sampled ADC bits to the LEDs, as they will be changing too fast (so the LEDs will appear to be on all the time), use the SignalTap II logic analyzer and trace some of the samples coming from the ADC. SignalTap II can plot the samples like an analog signal, eg., see the slides on pages 26 and 28
https://www.ovro.caltech.edu/~dwh/correlator/pdf/ee_live_14_hawkins.pdf Cheers,
Dave
Honored Contributor
