inline Assembly - How To ?

[lpcware]

Content originally posted in LPCWare by behzat_c on Tue May 24 04:29:45 MST 2011
Hey Everyone!

Is there any tutorial or example cod snippet where i can look up for how to embed assembly code in to C program.

I know that there is an asm(" ... ") function to that but i mean how can i access a variable or array element defined in C within that assembly program?

Also,

is there any special instruction set for NXP series or just the classic Cortex M3 instruction set apply here?

[lpcware]

Content originally posted in LPCWare by larryvc on Tue May 24 10:27:48 MST 2011
I realize that the post I referred you to does not actually answer your question.  But it does show how to use a separate assembly file that is callable from C.

Now you need to work on the accessing a variable or array element part.

Sorry I can't be of more help with that.

Larry

[lpcware]

Content originally posted in LPCWare by TheFallGuy on Tue May 24 09:50:27 MST 2011

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Quote: behzat_c


I also waiting for someone to tell how can i access the variables declared in C from assembly.

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This is a good place to start:

http://www.ethernut.de/en/documents/arm-inline-asm.html

[lpcware]

Content originally posted in LPCWare by whitecoe on Tue May 24 09:49:43 MST 2011

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Quote: behzat_c

Is there any tutorial or example cod snippet where i can look up for how to embed assembly code in to C program.

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There are quite a few previous posts about using assembly within LPCXpresso. As a starting point try....

http://lmgtfy.com/?q=assembly+site%3Aknowledgebase.nxp.com

HTH!

[lpcware]

Content originally posted in LPCWare by larryvc on Tue May 24 09:45:54 MST 2011
behzat_c,

I'm curious to know why you need inline assembler?

Also this post has an example for the LPC1343 that you can get ideas from:

http://knowledgebase.nxp.com/showpost.php?p=369&postcount=11

Larry

[lpcware]

Content originally posted in LPCWare by behzat_c on Tue May 24 09:40:17 MST 2011

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Quote: larryvc
To my knowledge there are no special instructions.  I'm assuming you are still talking about an LPC1769, the Cortex M3 instruction set does apply.

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Yes, I'm still talking about LPC1769. Thanks for the info.

I also waiting for someone to tell how can i access the variables declared in C from assembly.

[lpcware]

Content originally posted in LPCWare by larryvc on Tue May 24 09:30:47 MST 2011

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Quote: behzat_c

is there any special instruction set for NXP series or just the classic Cortex M3 instruction set apply here?

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To my knowledge there are no special instructions.  I'm assuming you are still talking about an LPC1769, the Cortex M3 instruction set does apply.