====== Arty S7 XADC Demo ======


{{:learn:programmable-logic:tutorials:arty-s7-xadc-demo:arty-s7-xadc-2v.jpg?500|}}

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===== Description =====

This simple XADC demo project demonstrates a simple usage of the Arty S7's XADC pin capability. The behavior is as follows:
  * The 6 User LEDs increment from top right to left then bottom right to left as the voltage difference on the selected XADC pins gets larger.
  * The four switches select which channel to read from.

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===== Inventory =====

  * Arty S7 with a MicroUSB Programming Cable
  * 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.//
  * Wires and a circuit to measure

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===== 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  |
| Arty S7-25 | @#C0EEBD: 25/XADC/2020.1-1  | [[https://github.com/Digilent/Arty-S7/releases/tag/25/XADC/2020.1-1|Release ZIP Downloads]]  | See //Using the Latest Release//, below  |
| Arty S7-50 | @#C0EEBD: 50/XADC/2020.1-1  | [[https://github.com/Digilent/Arty-S7/releases/tag/50/XADC/2020.1-1|Release ZIP Downloads]]  | See //Using the Latest Release//, below  |
| Arty S7-25 | v2018.2-1            | [[https://github.com/Digilent/Arty-S7-25-XADC/releases/tag/v2018.2-1|Release ZIP Downloads]]  | [[https://github.com/Digilent/Arty-S7-25-XADC/tree/v2018.2-1|v2018.2-1 Github README]]  |
| Arty S7-50 | v2018.2-1            | [[https://github.com/Digilent/Arty-S7-50-XADC/releases/tag/v2018.2-1|Release ZIP Downloads]]  | [[https://github.com/Digilent/Arty-S7-50-XADC/tree/v2018.2-1|v2018.2-1 Github README]]  |

**Note for Advanced Users:** //All demos for the Arty S7 are provided through the [[https://github.com/Digilent/Arty-S7|Arty-S7]] repository on Github. Further documentation on the structure of this repository can be found on this wiki's [[programmable-logic:documents:git]] page.//
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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 Arty S7 #

Plug the microUSB programming cable into the Arty S7's PROG/UART port. Set up the circuit that you want to measure.

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<--

{{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>

<--

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===== Functionality =====

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

For this demo, A0-A5 are single-ended analog inputs while A6-A7, A8-A9, and V_P-V_N are differential analog input pairs.

<WRAP round important 660px>
===Important===
The Voltage range for differential analog input pairs is 0-1V and the range for single-ended analog inputs is 0-3.3V. For the pairs,
A6, A8, and V_P are the positive inputs and A7, A9, and V_N are the negative inputs.
</WRAP>

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==== LEDs ====

The LEDs turn on from right to left then continue onto the bottom as the input voltage increases.


{{:learn:programmable-logic:tutorials:arty-s7-xadc-demo:arty-s7-xadc-0v.jpg?300|}}{{:learn:programmable-logic:tutorials:arty-s7-xadc-demo:arty-s7-xadc-2v.jpg?300|}}{{:learn:programmable-logic:tutorials:arty-s7-xadc-demo:arty-s7-xadc-3v3.jpg?300|}}

//XADC Demo with Analog Input 0 (Single-Ended) receiving 0.0V, 2.0V, 3.3V//

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==== Selecting a Channel ====

To display a different channel on the LEDs, change the user switches to the desired channel. The drop-downs below contain tables that show the switch positions that correspond to each analog input for each of the variants of the Arty S7.

--> Arty S7-50 #

^ Channel Pin/s  ^ SW3            ^ SW2   ^ SW1   ^ SW0   ^
^ A0             ^ Down           ^ Down  ^ Down  ^ Down  ^
^ A1             ^ Down           ^ Down  ^ Down  ^ Up    ^
^ A2             ^ Down           ^ Down  ^ Up    ^ Down  ^
^ A3             ^ Down           ^ Down  ^ Up    ^ Up    ^
^ A4             ^ Down           ^ Up    ^ Down  ^ Down  ^
^ A5             ^ Down           ^ Up    ^ Down  ^ Up    ^
^ A6-A7          ^ Down           ^ Up    ^ Up    ^ Down  ^
^ A8-A9          ^ Down           ^ Up    ^ Up    ^ Up    ^
^ V_P-V_N        ^ Up             ^ Down  ^ Down  ^ Down  ^
^ None           ^  Other Values                       ||||

<--

--> Arty S7-25 #

^ Channel Pin/s  ^ SW3            ^ SW2   ^ SW1   ^ SW0   ^
^ A0             ^ Down           ^ Down  ^ Down  ^ Down  ^
^ A1             ^ Down           ^ Down  ^ Down  ^ Up    ^
^ A2             ^ Down           ^ Down  ^ Up    ^ Down  ^
^ A3             ^ Down           ^ Down  ^ Up    ^ Up    ^
^ A4             ^ Down           ^ Up    ^ Down  ^ Down  ^
^ A5             ^ Down           ^ Up    ^ Down  ^ Up    ^
^ A6-A7          ^ Down           ^ Up    ^ Up    ^ Down  ^
^ A8-A9          ^ Down           ^ Up    ^ Up    ^ Up    ^
^ A10-A11        ^ Up             ^ Down  ^ Down  ^ Down  ^
^ V_P-V_N        ^ Up             ^ Down  ^ Down  ^ Up    ^
^ None           ^  Other Values                       ||||

<--
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===== Additional Resources =====

All materials related to the use of the Arty S7 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.

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