Cyclone V GX Starter Kit - Audio Codec

I think a better approach for a beginner might be to take the existing audio example project from the product CD and modify it to fit your needs. You should make small changes, testing each one as you go. Make use of SignalTap to look at the working digital audio signal going into the codec. Check that against what you are generating to make sure you have the timing correct. You might want to make a version of the demo that adds your tone generation and uses a switch to control yours vs the demos tone generation going to the codec.