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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [March 2011 Threads] Is the software stack big enough?Posted by SanderVH on March 3, 2011 My device: PIC18F4550, software-environment MPLAB IDE
I have a question concerning the software stack size. In the linkerfile there is STACK SIZE=0x60 RAM=BIG_BLOCK, so there are 96 places. But in the FreeRTOSconfig.h file there is this value #define configMINIMAL_STACK_SIZE( 105 )
1. why is the size in the linkerfile smaller than the configminimalstacksize? 2. when i count, how many bytes we need i get this:
i think, probably wrong because thousands of people calculated it before me, the calculation is like this:
3 dummies for debugging 2 for address parameters 1 empty space 16 for WREG,status,intcon, bsr, fsr2L,..., pclath 20 for .tmpdata and math_data 2 for top global data section 3 for the address of the task on the stack 1 for number of return addresses 1 for afterwards topofstack++ +--- 49
and if we want to save a whole hardware stack we need 139 bytes for the software stack of 1 task. So actually i don't have any clue how the minimal stacksize is 105, but i think you do, would you mind to tell me?
It would be very kind if someone could see to my questions :) thanks!
Kind regards, Sander
RE: Is the software stack big enough?Posted by SanderVH on March 4, 2011 Mmm i made a mistake, software stack is not the same as the allocated space per task. Still i want to know the answer of the second question, why a configMINIMAL_STACK_SIZE of 105?
Thanks for the replies.
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