FPU + external C file - how to return double

I'm working on a piece of assembly procedure that would enable me to return a double value (generated in asm module) to C code.

Up to now never produced such a code, so would be grateful if you could assist me a bit. I know that I should leave the value in st(0)

currently wrote a piece of C :

#include

extern double test(void) ;

void main ( void )
{
double p ;
p = test () ;
printf ( "The num is %f \n", p ) ;
}

When I write and leave purre integer there's no problem. But how to leave 64bit value in ST ?

I start with

finit
fld... and here comes the problem

thanks for any assistance
Stebel.

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1 post since Apr 2005

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