FreeRTOS heap size issue?

Kernel
1

guggech wrote on Wednesday, January 03, 2018:

Hi, I am using FreeRTOS with an Atmel xmega256D3 and using Atmel studio. I am running into a strange issue and hoping that somebody might have some idea on what is going on. I currently have my heap size set 7700 and things seems to work. When I increase the heap size to 7800 or 7900 without excedding the memory boundary, the program does not work, it either keeps resetting, freeze after the power up cycle. I am running 10 tasks which have all been check for stack space.
Thanks.
Charles

2

rtel wrote on Wednesday, January 03, 2018:

Check the linker script is describing the memory layout of your chip
correctly. Perhaps you are trying to use memory that is not physically
present.

3

guggech wrote on Thursday, January 04, 2018:

Is the heap allocated from the high memory to low or the other way?

4

rtel wrote on Friday, January 05, 2018:

Can’t say for sure if you are using heap_3.c as that maps to the
malloc() implementation provided by your compiler, but in all other
cases it is low to high.

5

richard_damon wrote on Friday, January 05, 2018:

Depends on which heap you are using. heap3.c uses the systems malloc function, which depends on the implementation. The other version use a static array, whose size is set in FreeRTOSConfig.h