====== Nexys Video GPIO Demo ======

<WRAP todo important>
== Under Construction ==
</WRAP>

{{:nexys-video:nexysvideogpioled2.jpg?500|}}
----
===== Description =====

The Basic User Demo project demonstrates a simple uses of the Nexys Video's 
GPIOs, UART serial port, and OLED display. The behavior is as follows:
 
  * The 8 User LEDs are tied to the 8 User Switches.
  * An introduction message is sent across the UART when the device is finished being configured.
  * BTNC resets the LED and UART modules.
  * A message is sent over UART whenever BTNU, BTNL, BTND, or BTNR is pressed.
  * The onboard OLED display shows the alphabet followed by the message "This is Digilent's Nexys Video".
  * The onboard OLED display is turned off by pressing the CPU_RESET button.

----
===== Inventory =====

  * Nexys Video 
  * Two MicroUSB Cables
  * Vivado installation compatible with the latest release of this demo (2020.1)
    * //See [[programmable-logic:guides:installing-vivado-and-vitis|Installing Vivado, Vitis, and Digilent Board Files]] for installation instructions.//
  * Serial Terminal application to receive messages printed by the demo
    * //See [[programmable-logic:guides:serial-terminals:start]] for more information.//
  * Nexys Video 12 Volt Power Supply

----
===== Download and Usage Instructions =====

First and foremost, releases - consisting of a set of files for download - are only compatible with a specific version of the Xilinx tools, as specified in the name of the release (referred to as a //release tag//). In addition, releases are only compatible with the specified variant of the board. For example, a release tagged "20/DMA/2020.1" for the Zybo Z7 is only to be used with the -20 variant of the board and Vivado 2020.1.

The latest release version for this demo is highlighted in green.

**Note:** //Releases for FPGA demos from before 2020.1 used a different git structure, and used a different release tag naming scheme.//

^ Board Variant  ^ Release Tag  ^ Release Downloads  ^ Setup Instructions  |
| Nexys Video  | @#C0EEBD: GPIO/2020.1-1  | [[https://github.com/Digilent/Nexys-Video/releases/tag/GPIO/2020.1-1|Release ZIP Downloads]]  | See //Using the Latest Release//, below  |
| Nexys Video  | v2018.2-1 | [[https://github.com/Digilent/Nexys-Video-GPIO/releases/tag/v2018.2-1|Release ZIP downloads]] | [[https://github.com/Digilent/Nexys-Video-GPIO/tree/v2018.2-1| v2018.2-1 Github README]] |
| Nexys Video  | v2016.4-1 | [[https://github.com/Digilent/Nexys-Video-GPIO/releases/tag/v2016.4-1|Release ZIP downloads]] | [[learn/programmable-logic/tutorials/github-demos/start|Using Digilent Github Demo Projects (Legacy)]]   |


**Note for Advanced Users:** //All demos for the Nexys Video are provided through the [[https://github.com/Digilent/Nexys-Video | Nexys Video]] repository on Github. Further documentation on the structure of this repository can be found on this wiki's [[programmable-logic:documents:git]] page.//
----
Instructions on the use of the latest release can be found in this dropdown:

--> Using the Latest Release #

<WRAP group>

{{page>programmable-logic:guides:using-github-releases#hardware_only_release_before_programming&noheader}}

--> Set up the Nexys Video #

Plug the 12V Power Supply into the Nexys Video.

Plug the MicroUSBs into the UART and PROG ports.

----
<--

{{page>programmable-logic:guides:using-github-releases#hardware_only_release_programming&noheader}}

At this point, the demo is now running on your board. Refer to the [[#description|Description]] and [[#functionality|Functionality]] sections of this document for more information on what it does.
</WRAP>

<--
----
=====Functionality=====

====1. Using the Switches with LEDs====

>For this section, all the switches are tied to their corresponding led. Every time a switch is toggled, the led directly above it will toggle with it.
>
>{{:nexys-video:nexysvideogpioled1.jpg?300|}}  {{:nexys-video:nexysvideogpioled2.jpg?300|}}   {{:nexys-video:nexysvideogpioled3.jpg?300|}}

====2. UART Communication Using the Buttons====

>On startup, the Nexys Video will transmit "Nexys Video GPIO/UART DEMO!". Whenever one of BTNU, BTNL, BTND, or BTNR is pressed, the Nexys Video transmits "Button press detected!".

====3. OLED Display====

>On startup the onboard OLED will display the full alphabet and numbers 0-9. Then after about a second, the OLED will turn off for another second. After this, the OLED will display the message "This is Digilent's Nexys Video".
>
>{{:nexys-video:nexysvideogpiooled1.jpg?300|}} {{:nexys-video:nexysvideogpiooled2.jpg?300|}}

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

===== Additional Resources =====

All materials related to the use of the Nexys Video can be found on its [[..:start|Resource Center]].

For a walkthrough of the process of creating a simple HDL project in Vivado, see [[programmable-logic:guides:getting-started-with-vivado]]. Information on important parts of the GUI, and indirect discussion of the steps required to modify, rebuild, and run this demo in hardware can also be found here.

For technical support, please visit the [[https://forum.digilentinc.com/forum/4-fpga/|FPGA]] section of the Digilent Forum.

<code>{{tag>project nexys-video}}</code>