CMSIS 6 Documentation in HTML format is published online at https://arm-software.github.io/CMSIS_6.
The version drop-down menu in the "Overview" book allows to switch between the documentation provided with official releases and the latest draft documentation for the main branch.
The documentation source is maintained in /CMSIS/Documentation/Doxygen/ folder as a mixture of markdown and doxygen formats. Software source and header files, templates and examples may also contribute information that gets integrated into the final documentation.
Generating the HTML-formatted documentation from the source is done with gen_doc.sh script:
CMSIS_6 $ ./CMSIS/Documentation/Doxygen/gen_doc.shThe script expects specific version of doxygen to be installed locally. After successful execution the resulting documentation package is then available in ./CMSIS/Documentation/html/.