topic Re: How to combine assembly code with C - Inline ASM example in Classic/Legacy CodeWarrior

How to combine assembly code with C

Jalen — Sun, 08 Jul 2007 15:53:51 GMT

I am new to code warrior and embedded design. How do i combine C code with assembly codes? Thx

Re: How to combine assembly code with C

bigmac — Sun, 08 Jul 2007 19:40:26 GMT

Hello and welcome to the forum.

You can incorporate assembly instructions directly within a C function, using "inline assembly". You should find further information within the manual for the compiler. The format for some of the instructions will differ from that for "standard" assembler.

Alternatively, you could create a separate file, written in "standard" (relocatable) assembler, and consisting of assembly sub-routines. However, parameter passing to these routines will need to match the requirements of C for the MCU you are using, and a prototype for each routine will need to be visible from the C module(s). Perhaps the simplest method of handling parameters for the assembly routines is via global variables.

Regards,

Mac

Re: How to combine assembly code with C - Inline ASM example

Alban — Mon, 09 Jul 2007 01:23:21 GMT

Hello,

The post referenced after is showing how to do INLINE assembly.
You create a asm{} and put your assembly code in the curly brackets:

/message?board.id=CFCOMM&message.id=235 http://forums.freescale.com/freescale/board/message?board.id=CFCOMM&message.id=235" target="_blank

Look for "asm {" as a keyword in the search at the bottom of forum pages.

Cheers,
Alban.

Re: How to combine assembly code with C - Inline ASM example

CrasyCat — Mon, 09 Jul 2007 16:39:39 GMT

Hello

Just to close the loop here, the HC08 or HC12 assembler manual include a section around mixing C and assembly in an application.

- Depending on the CPU you are using open the file {Install}\Help\PDF\Assembler_HC08.pdf or

{Install}\Help\PDF\Assembler_HC12.pdf.

- For HC08 go to chapter "Using the HC(S)08 Assembler", section

"Mixed C and Assembler application"

- For HC12 go to chapter "Using the HC(S)12 Assembler", section

"Mixed C and Assembler application".

CrasyCat

Re: How to combine assembly code with C - Inline ASM example

Jalen — Thu, 12 Jul 2007 17:38:58 GMT

Thanks loads to everyone for your help!