National Instruments 320571-01 用户手册

long *n,*imin,*imax;
{
long i,j;
float *x, small;
float localmin ,localmax;

if ((*n)<= 0) return(0);
x = z;
localmin = *x;
localmax = localmin;
*imax = 0;
*imin = 0;
for (i=0;i< *n;i++,*x++) {
    if (localmax < *x) {
         localmax = *x;
         *imax = i;
         }

    if (localmin > *x) {
         localmin = *x;
         *imin = i;
         }
    }

*min = localmin;
*max = localmax;

for(i=0; i< *n; i++) y[i] = z[i];
for(i=0; i< *n; i++){
   for(j=i+1; j< *n; j++)
      if(y[i] > y[j]) {
         small = y[j];
         y[j] =  y[i];
         y[i] = small;
      }
  }
return(noError);
}

The file 

ATDSP.h

 is the header file containing all of the error codes used by the DSP Library.  You can

find it in the 

LIB

 directory.  To efficiently and correctly compile WE DSP32C code that uses error codes

defined in 

ATDSP.h

, you may want to copy this header file to the 

Include

 directory of your WE

DSP32C tools.  Otherwise, you should specify the correct path of 

ATDSP.h

 in your program.

When adding functions to build your custom DSP Library, follow these guidelines:

•

Pass all parameters by address–All input, output, and input/output parameters, whether arrays or scalars, must
be passed by address (pointer).  For instance, in the example 

gmaxmin.c

, although the length n of an input

array is only an input scalar, it is passed by address.

•

You must pass parameters in a certain order–Pass all pointers to arrays, then pass all of the pointers to 32-bit
floating-point scalars, and then pass all of the pointers to 32-bit long integer scalars.  In 

gmaxmin.c

, the

parameters are passed in the following order–z (input array), y (output array), max (output floating-point
scalar), min (output floating-point scalar), n (input integer scalar), imax (output integer scalar), and imin
(output integer scalar).