Nexys4 XADC Demo

This simple XADC Demo project demonstrates a simple usage of the Nexys4's XADC port capability. The behavior is as follows:

• The 16 User LEDs increment from right to left as the voltage difference on the selected XADC pins gets larger.
• The two seven segment displays show the voltage difference on the AD11 pins in volts.
• sw0 and sw1 select which channel to read from

You will need…

1. Vivado installed on your computer
2. Nexys4 board from digilent
3. Wires and a voltage to measure

1.1) Download the repository linked in the download section and unzip it in the location of your choosing.

1.2) Generate the XADC project in the Projects folder by following this guide before continuing: How to Generate a Project from Digilent's Github

To complete this step all that you need to do is click Generate Bitstream on the left hand menu towards the bottom. Vivado will run through both Run Synthesis and Run Implementation before it generates the bitstream automatically. If you want, you can click each step by itself in the order of Run Synthesis, Run Implementation and then Generate Bitstream.

Once you have generated your bit file, Click on the hardware manager and connect to your board by choosing the local server option.

After your board is connected, just click program to load the GPIO demo onto your Nexys4.

This portion will help you run the demo and observe all its features.

For this demo, the AD11P and AD11N pins are used on the JXADC header. We hooked up a signal generator to our pins. All of the other pins were grounded to avoid coupling.

The 7-Segment display shows the current voltage across the selected xadc pins. The LEDs turn on from right to left as the input voltage increases.

To display a different channel on the display and LEDs, change sw0 and sw1 to the desired channel.