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preemptive Multitasking

 
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Ted Ems



Joined: 30 Dec 2003
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preemptive Multitasking
PostPosted: Wed Jul 12, 2006 8:29 am     Reply with quote
The instruction bit_test(a,b) uses scratch area in ram. Can that area be determined at compile time. Or in a multitasking environment can an area be reserved for scratch for those instructions.


thanks
asmallri



Joined: 12 Aug 2004
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PostPosted: Wed Jul 12, 2006 9:45 am     Reply with quote
Not in the code I have looked at recently. You might want to recheck your assumptions.
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PCM programmer



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PostPosted: Wed Jul 12, 2006 1:05 pm     Reply with quote
See this post by Ttelmah:
http://www.ccsinfo.com/forum/viewtopic.php?t=27348&highlight=interrupt+scratch

Other possibilities:
Write your own functions in low-level C, so that you assign and control
the RAM used by them.
Ted Ems



Joined: 30 Dec 2003
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Preemptive multitasking
PostPosted: Wed Jul 12, 2006 7:36 pm     Reply with quote
PCM programmer
Thats exactly the way i am getting around this problem. Where did you find the information about the scratch area and when and what uses those areas?


Asmallri
You may be right i will take back that assumption.
PCM programmer



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PostPosted: Wed Jul 12, 2006 8:33 pm     Reply with quote
That is Ttelmah's post so I'll let him answer.
Ttelmah
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PostPosted: Thu Jul 13, 2006 4:06 am     Reply with quote
The start of the 'scratch' area, is defined in the chip setup (Tools, device editor, C Scratch RAM). Beyond this, as far as I know, it is just a matter of searching the listing. Historically there seem to be five locations in 'common' use (0 to 4). I'm afraid I don't know of any 'magic tool', that can tell you how much is used by particular functions...

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