Data in the RAM of STM32

[Pzhu.1]

I use IAR to program STM32，the map file shows that ：the RAM is divided to​ 1.data Section；2.CSTACK and HEAP section；3.bss section；4.Unassigned part of the RAM。

What I want to know is ​that:The Unassigned part of the RAM is used to do what? Because I want to expand the size of CSTACK ;but I am afraid of that ,too small of the uninitialized memory area size(the size of 4) will cause some wrongs.

Thanks.

 

[Ozone]

> The Unassigned part of the RAM is used to do what?

Nothing.

Your application does not need and use it.

Declare (and use) more variables, and the size will reduce.

>I want to expand the size of CSTACK ;but I am afraid of that ,too small of the uninitialized memory area size(the size of 4) will cause some wrongs.

Too small of a stack will definitely cause you trouble.

Determining the required stack size is not an exact science, toolchains are often quite bad at it, or forgo it for a fixed value.

The only additional requirement is, all the mentioned sections must fit into the RAM.

If not, the linker will tell you.

[Pzhu.1]

Thanks very much.Your answer helps me much