"Dynamic C" refers to the compiler, libraries and samples provided for Digi International's Rabbit brand of embedded controllers.
You might be able to make use of the command-line compiler "Dccl_cmp.exe" for your integration. It's possible to create listing files that you could parse to determine code coverage.
Note that Dynamic C includes multiple extensions to the C language, so you might have difficulty getting an off-the-shelf ANSI C code coverage tool to work with it.