lwgl

Leight weight variant of the gcc's gcov-library suitable for stm32.

Normally gcov does use a filesystem do dump out the coverage data. If used on a (embedded) platform without a file system the coverage data can be dumped via a serial interface. This code snippets show how to do so:

1. Compile those sourcefiles which shall produce a coverage report with -fprofile-arcs -ftest-coverage. This will tell the compiler to blow up your source code with additional code which is needed to gain a coverage report.
2. Take sure that the coverage initializers (static_init()) are called if not done by startup code.
3. Run your software
4. Call coverage_dump() which will dump the coverage data as an human readable format to serial console and capture the data on that serial interface. You may use cat /dev/ttyUSB0 > inputFile.txt for this.
5. Then call lwfs.sh inputFile.txt (see example in lwfs.sh) which creates all *.gcov files on your hard disk.
6. Much fun.

This method works pretty good for me. I addded some shell scripts to my makefile to do all these steps automatically. It works pretty fine. Much fun with it!

NOTE: Works for me with arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 5.4.1

TIP: Use Gcovr which is parsing and reporting tool for gcov to produce html reports: https://gcovr.com/