MQX memory allocation

marcomello95 — Tue, 18 Jun 2024 13:15:15 GMT

I'd like to understand how MQX really allocate memory. I couldn't fint it in the Reference Manual or in user guide. Is it using the HEAP? Is it using other regions? I'm searching to understand this mechanism.

Re: MQX memory allocation

danielchen — Fri, 12 Jul 2024 02:56:21 GMT

Hi @marcomello95 :

MQX uses its own memory allocation system, which does not reply on heap. The default MQX memory pool, where MQX kernel allocates system memory, is between __KERNEL_DATA_START and __KERNEL_DATA_END (symbols generated during bsp linkage).

MQX allocates memory using function _mem_alloc_system(). On top of this, in bsp we can define malloc() to call _mem_alloc_system(), to do this you need to follow these steps:
- First you have to define _mem_alloc_system* in preprocessor to be malloc
#define _mem_alloc_system malloc

- Then disable bsp "duplicate" definition of malloc (either by link order or be removing the duplicate definition from the sources).

Regards

Daniel

MQX Software SolutionsのトピックRe: MQX memory allocation

MQX memory allocation

Re: MQX memory allocation