Callin a C function from asm

The package is part of the R32C compiler NC100? Don't you use this compiler?
The manual of the compiler you use should explain how to interface between C and assembler functions, how the stack frame has to be configured, how parameters have to be passed, ... .

Frank,

Thks for your answer but my concern is about calling a C function from an assembler program
My core software is written in assembly and I just need to call few C functions but can't find any advise in the NC100 documentation

Regards,

Jean-Pierre

The call of a C function without parameters and without return parameter is just a simple JSR to the function where in assembler the C function name in preceded by a '_'.
If you want to pass parameters or receive a return parameter please refer to Appendix D.3 of the NC100 User's Manual.

Thanks Frank for the update,
I will try to use these C function calling according to the examples described in the appendix

Brgds
Jean-Pierre

Hi there,

This project has been sleeping for a while and now is back to life !

I am still struggling to call a C function from an assembler program

Here is the command used:

jsr $pff.c   I tried also jsr _pff.c

The result is always the same:

Error (asp100): Characters exist in expression

Any clue ?

Thks in advance for your help

Jean-Pierre

Hi there,

This project has been sleeping for a while and now is back to life !

I am still struggling to call a C function from an assembler program

Here is the command used:

jsr $pff.c   I tried also jsr _pff.c

The result is always the same:

Error (asp100): Characters exist in expression

Any clue ?

Thks in advance for your help

Jean-Pierre