The latest official release of the manual can be downloaded at the link above.
In addition, after invoking make doc it can be found in the source tree at doc/manual.pdf.
The function prototypes for interfacing to the library are documented in the online Doxygen. This is still in construction but already usable. It can be accessed by clicking onto the icon above, the link at the upper right corner of this web page or here.
In addition, after invoking make doc its latest version can be found in the source tree at doc/html/index.html.
A sample code how to integrate ScaFaCoS into an application is included in the library under test/generic/.