RE: How to stored global variable in CPU flash (MCF5213 Freescale)
Flash is not a replacement for RAM.
It wears out quickly (the code space flash isn't specified for the
same number of rewrite cycles as data flash intended for flash file
systems), so even slowly changing variables can't be stored in the
You either have selected the wrong processor, or you have written
code that makes use of too many - or too large - variables.
With potentially larger code, you can often change from 32-bit
integers into 16-bit or 8-bit variables, after checking what real
numeric range you need.
Keeping down on recursion means you can save stack space.
Keeping down on global variables and trying to have variables on
the stack - just living for the amount of time they are really needed
- means the same stack space can be used for multiple different
variables instead of each being a unique global variable.
Sometimes, you can convert multiple boolean conditions into
individual bits stored in a single variable. Potentially larger code
size, depending on processor used, but less RAM requirements.
But I'm sure you really did spend sometime checking up on your RAM
budget in relation to your software design, before you selected what
processor to use.
By the way, the MCF5213 is a ColdFire processor. Didn't realize
something was wrong, when you didn't find any suitable processor
architecture on this forum? You really, really sure this is the right
forum for your questions?