An effective way to measure the amount of stack space needed consists of filling the estimated stack space with a well-known pattern. This mechanism, informally referred to as stack painting, reveals the maximum expansion of the execution stack at any time. By running the software with a painted stack, it is in fact possible to measure the amount of stack used by looking for the last recognizable pattern, and assuming that the stack pointer has moved during the execution at most until that point.
We can perform stack painting manually in the reset handler, during memory initialization. To do so, we need to assign an area to paint. In this case it would be the last 8 KB of memory up until _end_stack. Once again, while manipulating ...
