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Altera_Forum's avatar
Altera_Forum
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21 years ago

NIOSII uCOSII Stack - 2 bytes wide, or 4?

I have just started with some of the examples. The ported uCOS-II code seems to indicate in many places that only a 16bit stack is needed. I am assuming this is incorrect as my programs always crash ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

If you change OS_STK from int to short you will only get half as much stack, yet if you double the stack size the OS still won't run, so it must be type casting each stack array element to a long * causing the stack variables to over-align each other (or if mis-alignments don't work as you mentioned, then writing onto the same stack space twice would happen).

Basically what I am asking is should sizeof(OS_STK) by 4 or 2? In many comments it says 16bit yet I can only get it working as 32bit.

I have modified the sys_thread_new to use the TaskCreateExt function so that the extra options can be used, and as you said they appear to return byte counts.