I would like to know what the shading means in the left margin of the source code window in debug. It is mostly a very light gray but certain parts of it are a darker gray so it look like a bunch of little dark gray blocks. I can't for the life of me figure out if it relates to comments or blocks of code or what. Since I am troubleshooting some code that does not seem to be getting executed it would be helpful to know. I am using uVision MDK-Lite V4.72.10.0 for a STM32F0 processor.
Thanks.
Mike