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README.md

Cora Z7-10 XADC Demo

Description

This project demonstrates how to use the Cora Z7-10's ZYNQ FPGA's analog-to-digital core (referred to as the XADC) with a ZYNQ processor. Vivado is used to build the demo's hardware platform, and Xilinx SDK is used to program the bitstream onto the board and to build and deploy a C application.

To use this demo, the Cora Z7-10 must be connected to a computer over MicroUSB, which must be running a serial terminal. For more information on how to set up and use a serial terminal, such as Tera Term or PuTTY, refer to this tutorial.

A channel select index can be incremented by pressing button 0 and decremented by pressing button 1. The table below shows how the channel select index is used to select from the Cora's various analog inputs. RGB LED 0 is used to show the sign of the selected analog input. If the voltage read is greater than 0.5 Volts, the RGB LED is green; if the voltage read is less than -0.5 Volts, the RGB LED is red.

Index Analog Input/s
0 VP/VN Dedicated Differential Input
1 Shield Header A6-A7 Differential Input
2 Shield Header A8-A9 Differential Input
3 Shield Header A10-A11 Differential Input
3 Shield Header A0 Single-Ended Input
3 Shield Header A1 Single-Ended Input
3 Shield Header A2 Single-Ended Input
3 Shield Header A3 Single-Ended Input
3 Shield Header A4 Single-Ended Input
3 Shield Header A5 Single-Ended Input

Requirements

Demo Setup

  1. Download the most recent release ZIP archive ("Cora-Z7-10-XADC-2018.2-*.zip") from the repo's releases page.
  2. Extract the downloaded ZIP.
  3. Open the XPR project file, found at <archive extracted location>/vivado_proj/Cora-Z7-10-XADC.xpr, included in the extracted release archive in Vivado 2018.2.
  4. In the toolbar at the top of the Vivado window, select File -> Export -> Export Hardware. Select <Local to Project> as the Exported Location and make sure that the Include bitstream box is checked, then click OK.
  5. In the toolbar at the top of the Vivado window, select File -> Launch SDK. Select <Local to Project> as both the workspace location and exported location, then click OK.
  6. With Vivado SDK opened, wait for the hardware platform exported by Vivado to be imported.
  7. In the toolbar at the top of the SDK window, select File -> New -> Application Project.
  8. Fill out the fields in the first page of the New Application Project Wizard as in the table below. Most of the listed values will be the wizard's defaults, but are included in the table for completeness.
Setting Value
Project Name Cora Z7-10-XADC
Use default location Checked box
OS Platform standalone
Target Hardware: Hardware Platform design_1_wrapper_hw_platform_0
Target Hardware: Processor ps7_cortexa9_0
Target Software: Language C
Target Software: Board Support Package Create New (Cora Z7-10-XADC_bsp)
  1. Click Next.
  2. From the list of template applications, select "Empty Application", then click Finish.
  3. In the Project Explorer pane to the left of the SDK window, expand the new application project (named "Cmod-S7-25-XADC").
  4. Right click on the "src" subdirectory of the application project and select Import.
  5. In the "Select an import wizard" pane of the window that pops up, expand General and select File System. Then click Next.
  6. Fill out the fields of the "File system" screen as in the table below. Most of the listed values will be the defaults, but are included in the table for completeness.
Setting Value
From directory <archive extracted location>/sdk_appsrc
Files to import pane: sdk_appsrc Checked box
Into folder Cora-Z7-10-XADC/src
Options: Overwrite existing resources without warning Checked box
Options: Create top-level folder Unchecked box
  1. Click Finish.
  1. Plug in a test circuit to the Cora Z7-10's analog input pins.
  2. Open a serial terminal application (such as TeraTerm FIXME LINK) and connect it to the Cora-Z7-10's serial port, using a baud rate of 115200.
  3. In the toolbar at the top of the SDK window, select Xilinx -> Program FPGA. Leave all fields as their defaults and click "Program".
  4. In the Project Explorer pane, right click on the "Cora-Z7-10-XADC" application project and select "Run As -> Launch on Hardware (System Debugger)".
  5. The application will now be running on the Cora-Z7-10. It can be interacted with as described in the first section of this README.

Next Steps

This demo can be used as a basis for other projects by modifying the hardware platform in the Vivado project's block design or by modifying the SDK application project.

Check out the Cora-Z7-10'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 repo.

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