How to use SVN

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Most of the HPSDR software repositories are managed by Subversion, which is a popular collaborative software/firmware development tool for open-source projects. This is a code database repository that is developed with all copies of all code that has been checked in by developers. With a system like this you can go back and check out any previous version of the the software. Wikipedia has an overview of SVN at

To access this software you will need to install and use a Subversion (SVN) client. There are several clients listed at the above Wikipedia page. Some of our users have found TortoiseSVN for Windows XP easy to use; it can be downloaded from: The Tortoise documentation is at or can be accessed by pressing the F1 key in any Tortoise dialog box.

A free book on subversion is available at:

Downloading with TortoiseSVN

This is meant to be a simplified procedure to use the Windows SVN client 'TortoiseSVN'.

  • You have TortoiseSVN installed and working.
  • Create a new empty directory, Give it a name appropriate to the item(s) you are downloading.
  • Go to that empty directory, right click in the empty directory and from the menu choices choose 'SVN Checkout'. Enter the svn address of the item you want in the box titled 'URL of repository:'. A typical entry would be:
  • Click OK.

It should download all the data into the directory.....

Our SVN repository

The open HPSDR project maintains a SVN for the the members of the project. The top address of the repository is:

Please do not try to check out the entire SVN it is over 2.5 GB. Because of problems the root is no longer browsable. The following directories are under the trunk and are browsable.

Code is not generally erased from a repository. So many of the some of the directories are very active and may change daily other may have not changes in years. Check the dates on the files to determine when tey were lats updated. Your SVN program will help you keep a up to date copy of the code on your computer and you can easily update the directory with a single command.

The repository evolves over time so the organization is not usually for the new viewer but for those that post code. To help people find things here is an index of major folders. Several directories were not included in this list as they are empty.

SVN Directories


Chris Day's on OzyJanus to be used with SDR1000 from 2007


Reference files of the the ATLAS connections to other boards


Verilog and C# code for CYCLOPS


USB HPSDR protocol definitions, Atlas buss pin definitions


Code by Alberto DiBene for HPSDR Winrad


Verilog code for Janus Version 2


Verliog code for Janus Version 3


Steve Nance's C# code for DDUtil


Steve Wilson's code for verilog code for i2c simulation


Bill Tracey's utility code for testing a large number of interfaces.


Latest version of the Mercury verilog code


Bob McGwier's proposal and Documents of Horton and Odyssey


John Melton's code for ghpsdr (single machine no server) and ghpsdr3 (multiple receiver multi machine) code build for Linux systems. Uses DttSP, FFTw3, libusb1.0 and gtk+.


Phil Covington's code for MercScope, Ozy V1, and SharpDSP


C and Verilog code for test Ozy2

Ozy V1.2

First version of the Ozy verilog code

Ozy V1.4

First version of the Ozy verilog code

Ozy V1.5

First version of the Ozy verilog code

Ozy V1.6

First version of the Ozy verilog code

Ozy V1.7

First version of the Ozy verilog code


C# code to talk with FX2


C and Verilog code for Ozy II


C code to allow powerSDR to talk to SDR1000 through JANUS and Jack


Verilog code for Ozy-Janus from 2006


C code to initalize Ozy on a Windows system


Verilog code for Ozy-Janus based on new OZY code.


Latest version verilog code for PENELOPE.


Verilog code and documentation for PHOENIX.


PowerSDR files from 2007, PowerSDR code for HPSDR is on the Flex SVN


Diagrams for Atlas and Janus from 2006


Alex Shovkoplyas's verilog and firmware code for HPSDR


Phil Harmon's verilog and C# code for various projects


Ramakrishnan Muthukrishnan's code to the USB-Blaster using an Ozy board.


Verilog code for Mercury 3.0 and Ozy 1.8 Multi-receiver code


Scotty Cowling information of the code loaded in to production boards.


Joe Torrey's code fro PowerSDR using portAudio