The SW-DP protocol is described by the following publicly available documents:
DDI 0316 CoreSight™ DAP-Lite Technical Reference Manual
Programming Internal Flash Over the Serial Wire Debug Interface
CY8C41xx, CY8C42xx Programming Specifications
This was written in 2013, long before Saleae started bundling their own "SWD" analyzer. I continue to find that this analyzer decodes transactions that the Saleae offering seems unable to.
The Saleae SDK requires Python to script the build of an analyzer; if your computer doesn't have this installed, you are out of luck.
After downloading this project's code, issue the following command to download the SDK files from Saleae's github page:
git submodule update --init AnalyzerSDK
Read the file ./AnalyzerSDK/lib/readme.txt and follow its instructions. It will direct you to rename libAnalyzer64.so to libAnalyzer.so if you are running 64-bit Linux.
To compile, run the following from the base directory of this project:
python build_analyzer.py
Consult the Saleae support web site and their SampleAnalyzer for any issues with the compilation procedure.
The end result of compilation is a library in the "SW-DP/release/" subdirectory. This file must be copied to the "Analyzers" subdirectory of the Saleae Logic software.
The contents of this repository are released under LGPL 2.1.