emeter_multiply_subroutines.c

来自「TI三相电能表源程序」· C语言 代码 · 共 48 行

//**************************************************************************
//    This is a simple sinne gen function written in C
//
//    Vincent Chan 
//    Texas Instruments Hong Kong Ltd
//    Date        Comments
//    =====================
//    01/09/19    Code Starts
//**************************************************************************
#include "emeter_3phase.h"
//--------------------------------------------------------------------------

long software_mul(int voltage,int current)
{
long result;

result = voltage*current;
return ((long) result);
}


long hardware_mul(int voltage,int current)
{
long result;

MPYS=voltage;
OP2=current;

result=RESLO;
result+= (long) RESHI<<16;

return (result);
}

int fractional_mul(int input,int scale)
{
long result;

MPYS=input;
OP2=scale;

result=RESLO;
result+= (long) RESHI<<16;

result<<=1;

return ((int) (result>>16));
}