RE: Virtual Page overwritten by application

Einar Thorsrud — Fri, 25 Mar 2022 12:37:05 GMT

Hi MKarl,

I understand the problem. When you remove optimization, the machine code matches closely to the C code, which makes it easy to step, watch variables etc, as what you see in the code is more or less what is actually in the binary. With optimization, the compiler will do tricks to try to achieve what it is supposed to focus on (smaller size, faster speed, etc), and then it is not at all easy to match the machine code to the C code. Therefore, you typically want to disable optimization when debugging.

In this case, where you cannot fit everything there are a few things you can do:

Simplest: Do you need 4 FDS pages when doing your testing or is it enough with 2 or 3?
You can keep optimize for size for the project as a whole, and specifically use a different optimization level for the files you are debugging in.
- If you for instance are using Segger Embedded Studio, you can right click on a file and select "Options...". Then adjust the optimization level under "Code Generation".

Einar