Nexys A7-100T XADC Demo

Description

This project is a Vivado demo using the Nexys A7-100T's analog-to-digital converter ciruitry, switches, LEDs, and seven-segment display, written in Verilog. When programmed onto the board, voltage levels between 0 and 1 Volt are read off of the JXADC header. The 16 User LEDs increment from right to left as the voltage difference between the selected channel's pins gets larger. The seven-segment display shows the voltage difference between the selected channel's pins in volts. SW0 and SW1 select which XADC channel is displayed, as shown in the table below. See the Nexys A7-100T's Reference Manual for more information about how the Artix 7 FPGA's XADC is connected to header JXADC.

XADC Channel	JXADC Pins	SW0 Position	SW1 Position
AD3	JXADC1(P) / JXADC7(N)	Up	Down
AD10	JXADC2(P) / JXADC8(N)	Down	Up
AD2	JXADC3(P) / JXADC9(N)	Down	Down
AD11	JXADC4(P) / JXADC10(N)	Up	Up

Requirements

• Nexys A7-100T: To purchase a Nexys A7-100T, see the Digilent Store
• Vivado 2018.2 Installation: To set up Vivado, see the Installing Vivado and Digilent Board Files Tutorial.
• MicroUSB Cable
• Wires and a Circuit to Measure

Demo Setup

1. Download and extract the most recent release ZIP archive from this repository's Releases Page.
2. Open the project in Vivado 2018.2 by double clicking on the included XPR file found at "<archive extracted location>/vivado_proj/Nexys-A7-100T-XADC.xpr".
3. In the Flow Navigator panel on the left side of the Vivado window, click Open Hardware Manager.
4. Plug the Nexys A7-100T into the computer using a MicroUSB cable.
5. In the green bar at the top of the window, click Open target. Select "Auto connect" from the drop down menu.
6. In the green bar at the top of the window, click Program device.
7. In the Program Device Wizard, enter "<archive extracted location>vivado_proj/Nexys-A7-100T-XADC.runs/impl_1/top.bit" into the "Bitstream file" field. Then click Program.
8. The demo will now be programmed onto the Nexys A7-100T. See the Introduction section of this README for a description of how this demo works.

Next Steps

This demo can be used as a basis for other projects, either by adding sources included in the demo's release to those projects, or by modifying the sources in the release project.

Check out the Nexys A7-100T's Resource Center to find more documentation, demos, and tutorials.

For technical support or questions, please post on the Digilent Forum.

Additional Notes

For more information on how this project is version controlled, refer to the Digilent Vivado Scripts Repository