How to call an Assembly "macro" function in C language code??

Abby3626

Intellectual 475 points

example:

in xx.asm

add3    .macro   P1, P2
            MOV   ACC,P1
           ADD   ACC,P2
           .endm

in xx.c

extern void add3(int,int);

void main(void)
{
add3(10,2);

}

there is some tings wrong.

Thanks

over 16 years ago

0 DaveB123 over 16 years ago

TI__Expert 4745 points

I would like to recommend you review the information in this document.

http://focus.ti.com/general/docs/techdocsabstract.tsp?abstractName=spra806

As well as Section 7.4.3 in this document.

http://focus.ti.com/general/docs/techdocsabstract.tsp?abstractName=spra806

0 BrandonAzbell over 16 years ago in reply to DaveB123

TI__Guru 63870 points

Ming said:

As well as Section 7.4.3 in this document.

http://focus.ti.com/general/docs/techdocsabstract.tsp?abstractName=spra806

I believe the link intended here is for the TMS320C28x Optimizing C/C++ Compiler User's Guide (SPRU514).

In particular, Section 7.4 discusses interface C/C++ code with assembly. There are certain conventions which need to be maintained when interfacing C/C++ to assembly. Certain registers are used in a C function call to pass parameters, etc. However, I'm not sure if you can use inline assembly with macros. I certainly have not tried it.

0 BrandonAzbell over 16 years ago in reply to BrandonAzbell

TI__Guru 63870 points

To follow up this discussion, you cannot call an assembly macro from C code.

0 Bob D. over 16 years ago

Expert 2430 points

Create an assembly routine that calls the macro, then call the assembly routine from C. Be sure to follow the C to assembly calling conventions and save/restore and registers used in the assembly code.

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How to call an Assembly "macro" function in C language code??