DE10-NANO - NIOS+ADC+DMA+ONCHIP MEMORY+HDMI on Platform Designer

Hello everyone, I'm new with FPGA, NIOS2 and Platform Designer and I have the DE10-nano board. As a project, I want to make a digital oscilloscope (a simple one at first).

I have Quartus Prime Lite Edition 17.1 and Nios II SBT.

The project consists on the following steps as I see it:

1. Sample 12-bit data from ADC channel 0.

2. Get the sampled data from the ADC to the on-chip memory through a DMA.

3. Show on LCD connected through HDMI a waveform made from the data saved on the on-chip memory.

Everything is controlled from a NIOS II Processor.

I've been using the ADC demonstration provided by terasIC to sample data from channel 0 (only one channel) successfully.

I tried adding a DMA controller and a On-chip memory to the Platform Designer to get all the sampled data from the ADC to the memory without success.

If someone can shed some light I would really appreciate that.

Hope I didn't miss any important information.

Thank you very much in advance