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    <p>If you're using both stack and heap, then it can be a little more tricky. I'll explain what I've done when no heap is used. As a general rule, all the companies I've worked for (in the domain of embedded C software) have avoided using heap for small embedded projects—to avoid the uncertainty of heap memory availability. We use statically declared variables instead.</p> <p>One method is to fill most of the stack area with a known pattern (e.g. 0x55) at start-up. This is usually done by a small bit of code early in the software execution, either right at the start of main(), or perhaps even before main() begins, in the start-up code. Take care not to overwrite the small amount of stack in use at that point of course. Then, after running the software for a while, inspect the contents of stack space and see where the 0x55 is still intact. How you "inspect" depends on your target hardware. Assuming you have a debugger connected, then you can simply stop the micro running and read the memory.</p> <p>If you have a debugger that can do a memory-access breakpoint (a bit more fancy than the usual execution breakpoint), then you can set a breakpoint in a particular stack location—such as the farthest limit of your stack space. That can be extremely useful, because it also shows you exactly what bit of code is running when it reaches that extent of stack usage. But it requires your debugger to support the memory-access breakpoint feature and it's often not found in the "low-end" debuggers.</p> <p>If you're also using heap, then it can be a bit more complicated because it may be impossible to predict where stack and heap will collide.</p>
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    1. POHow can I visualise the memory (SRAM) usage of an AVR program?
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    1. USCraig McQueen
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