====== Nexys Video XADC Demo ======

{{:nexys-video:nexysvideoxadc1.jpg?500|}}

===== Overview =====

==== Description ====

This simple XADC Demo project demonstrates the use of the Nexys Video's Analog to Digital port.

==== Features Used ====

|                                    ^ Not Used  ^ Used  ^
^ 8 user switches                    |    X      |       |
^ 8 user LEDs                        |    X      |       |
^ 128×32 monochrome OLED display     |           |   X   |
^ USB-UART Bridge                    |    X      |       |
^ 160-pin FMC LPC connector          |    X      |       |
^ Micro SD card connector            |    X      |       |
^ HDMI Sink and HDMI Source          |    X      |       |
^ DisplayPort Source                 |    X      |       |
^ Audio codec w/ four 3.5mm jacks    |    X      |       |
^ 6 user push buttons                |    X      |       |
^ User EEPROM                        |    X      |       |
^ 10/100/1000 Ethernet PHY           |    X      |       |
^ 512MiB 800Mt/s DDR3 Memory         |    X      |       |
^ Serial Flash                       |    X      |       |
^ Four Pmod ports                    |    X      |       |
^ Pmod for XADC signals              |           |   X   |
^ USB HID Host                       |    X      |       |

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===== Prerequisites =====

===Skills===
  * **Basic familiarity with Vivado**
    *  //This experience can be found by walking through our "Getting Started with Vivado" guide//

===Hardware===
  * **Nexys Video FPGA board**
  * **Micro-USB cable**
  * **Nexys Video 12 Volt Power Supply**
  * **Wires and a voltage to measure**

===Software===
  * **Vivado Design Suite 2016.4** 
    * //Newer/older versions can be used, but the procedure may vary slightly//

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===== Downloads =====
Nexys Video XADC Demo Repository -- [[https://github.com/Digilent/Nexys-Video-XADC/releases/download/v2016.4-1/Nexys-Video-XADC-2016.4-1.zip|ZIP Archive]] [[https://github.com/Digilent/Nexys-Video-XADC|GIT Repo]]
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===== Download and Launch the Nexys Video XADC Demo =====

>Follow the [[:learn:programmable-logic:tutorials:github-demos:start|Using Digilent Github Demo Projects]] Tutorial. This is an HDL design project, and as such does not support Vivado SDK, select the tutorial options appropriate for a Vivado-only design.

===== Using the Nexys Video XADC Demo =====

====1. Applying a Voltage to the XADC Port====

>For this demo, the AD1, AD0, AD8, and AD9 differential inputs on the JXADC header are used. We constructed a resistor ladder to connect each of the four channels' p pins to a Voltage level between zero and one, using one of the Pmod Ports to supply 3.3 Volts to the circuit. Each of the channels' n pins were grounded.
>
>{{:nexys-video:nexysvideoxadc0.jpg?500|}}


====2. OLED Display====

>The OLED display shows the Voltage differential across each of the xadc pin pairs located on JXADC. 
>
>{{:nexys-video:nexysvideoxadc1.jpg?500|}}

<WRAP round important 660px>
===Important===
Before turning off or reprogramming your board, shut down the OLED display by pressing the **CPU_RESET** button.
</WRAP>

{{tag>learn programmable-logic project nexys-video}}