If the ram size is less than 4096 machine word,then I CAN'T use mem malloc function,am'I right about m5p01_muprokaron

[hungry-foolish]

yeah, you got it. You can’t use the built in allocator if you have too little memory. The dynamic memory allocation module provided is there to handle complex allocation requests (arbitrary block sizes) rather than simple fixed block size allocations. Designed as such, the dynamic memory module have a relatively higher memory overhead but is more flexible. If you have too little memory, then there’s no need for such a general-purpose dynamic memory allocation routine, you can supply your own routines which is usually just allocating a fixed block size, or do not use dynamic allocation at all. For devices with larger memory, if you just want very frequent fixed size block allocation/frees, you can use the built in allocator as a primary allocator, then allocate your smaller fixed size trunks with your own secondary allocator on the memory returned by it.

[hungry-foolish]

STM32L051 only have 8kB RAM. This is too small for an advanced general purpose real-time memory allocation algorithm such as TLSF to make sense, thus It is rendered unusable.

[Pupil2013]

Thanks,Got it.
You art right ,there is no need to dynamic allocate memory in such small ram

[Pupil2013]

I think the task scheuler function is enough for my work,I will try this later

[hungry-foolish]

what project r u working on?

[Pupil2013]

Sensors powered by battery.
It's functions are simple ,but the logic is a little complex.
So I want a small rtos to schedule tasks, then I can focus on something really matters.