Integrating PIC ASM as a callable function from C18 - Electronic Circuits Projects Diagrams Free

toodles · 2nd July 2007, 08:44 AM

I have a large C18 project currently in place that requires a few functions to be tightly controlled in assembly language. Inline __asm isn't cutting it. Does anyone know of any documentation or existing projects have have a C18 calling a function from a MPASM compiled .asm file, as well as C18 functions being called from an assembly function?

v1r05 · 2nd July 2007, 08:51 PM

Inline Assembly

Assembler code can be included in the C code, the block of assembly code starts with _asm and ends with _endasm:
_asm
[label:] [ [arg1[, arg2[, arg3]]]]
_endasm

aussiepoof · 3rd July 2007, 01:02 AM

Quote:

Originally Posted by toodles

I have a large C18 project currently in place that requires a few functions to be tightly controlled in assembly language. Inline __asm isn't cutting it. Does anyone know of any documentation or existing projects have have a C18 calling a function from a MPASM compiled .asm file, as well as C18 functions being called from an assembly function?

Have you taken a look at the library source code that's included with C18? As I remember it, the memcpy routine is written in assembler using the C18 calling conventions... that might provide you the skeleton you need for your routine.

Regards,
Paul

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2nd July 2007, 08:44 AM	(permalink)
toodles	Integrating PIC ASM as a callable function from C18 I have a large C18 project currently in place that requires a few functions to be tightly controlled in assembly language. Inline __asm isn't cutting it. Does anyone know of any documentation or existing projects have have a C18 calling a function from a MPASM compiled .asm file, as well as C18 functions being called from an assembly function?

2nd July 2007, 08:51 PM	(permalink)
v1r05	Inline Assembly Assembler code can be included in the C code, the block of assembly code starts with _asm and ends with _endasm: _asm [label:] [ [arg1[, arg2[, arg3]]]] _endasm