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Stack Size !

Posted by Sachin Bhujbal on January 9, 2009
Dear All,


I am working on STR9-Angilia-FreeRTOs Project.
I am creating 9 Tasks having same priority( 5 ). configMAX_PRIORITY is 8.
Stack size are
1) Stack sizes of 4 Tasks are 100.
2) Stack sizes of other 5 Tasks are 400. ( 4 of these Tasks are multiple instances of one Task )

But one of the above Task which having 100 Stack Size is not getting created due to stack size.

As per site documentation higher the value of configMAX_PRIORITY more RAM will
be required by Kernel. Therefore I kept priorities of All Tasks to 1 and configMAX_PRIORITY set to 2. But found same result.

I don't know why stack size is creating problem if STR9 is having 96K RAM ?
How should I calculate Stack sizes ?
I know that we have to add sizes all variables used in Task & in related functions.
Am I right or tell me how to calculate it exactly ?

Please help me in this issue.

Thanks,

Sachin D. Bhujbal

RE: Stack Size !

Posted by Dave on January 9, 2009
If you are using heap_1.c or heap_2.c then increase the value of configTOTAL_HEAP_SPACE in FreeRTOSConfig.h.

RE: Stack Size !

Posted by Sachin Bhujbal on January 9, 2009
Thanks Dave,
Problem is solved after increasing Heap Size.,
I read it in document that it is ram size available to Kernel.
But can You explain me in detail about Heap & its use ?

Please answer !

RE: Stack Size !

Posted by Dave on January 9, 2009
Did you read this
http://www.freertos.org/a00111.html ?


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