topic S32K314 FreeRTSO Heap Usege question in S32K

S32K314 FreeRTSO Heap Usege question

Wangfangyuanx — Wed, 11 Jun 2025 03:45:00 GMT

I created 5 tasks and a timer task using FreeRTOS on the S32K314 MCU. When I checked the Heap Usage, I found that 75% of the heap had been used. I didn't use the pvPortMalloc() function to allocate space in my code. Is this normal? If not, how can I check where exactly the heap space is being used? The FreeRTOS SDK I'm using is SW32K3_FreeRTOS_10_4_6_UOS_2_0_0_DS_updatesite_D2204, and the RTD version is SW32K3_RTD_4.4_2.0.0_DS_updatesite_D2204. I'm looking forward to your reply. Thank you.

Re: S32K314 FreeRTSO Heap Usege question

danielmartynek — Wed, 11 Jun 2025 10:44:33 GMT

Hi @Wangfangyuanx,

Which heap implementation do you use?

https://www.freertos.org/Documentation/02-Kernel/02-Kernel-features/09-Memory-management/01-Memory-management

BR, Daniel

Re: S32K314 FreeRTSO Heap Usege question

Wangfangyuanx — Thu, 12 Jun 2025 06:35:25 GMT

Hi, Daniel, the heap implementation that I used was heap_4

Re: S32K314 FreeRTSO Heap Usege question

danielmartynek — Fri, 13 Jun 2025 12:50:22 GMT

Hello @Wangfangyuanx,

As you can see in the screenshot you posted, the tasks are allocated on the heap.

pvPortMalloc() is called by xTaskCreate();

FreeRTOS has also this API: xTaskCreateStatic() that can be use.

You need to enable "support static allocation".

Regards,

Daniel