National Instruments Car Stereo System 320571-01 用户手册

Compile all new C source files and assemble all new assembly source files using the WE DSP32C C compiler and
assembler.  Remember to use only 

float

 and 

long

 data types for scalars.  If you use any of the error codes from

Appendix A, Error Codes, include 

ATDSP.h

 at the beginning of your source code.  A function that completes with

no error should return 

noError

 or zero.  The 

ATDSP.h

 file is in the 

Lib

 directory.  After you have installed the

WE DSP32C tools, you may want to copy 

ATDSP.h

 to the 

Include

 directory in the root directory for those tools.

In this example, use 

d3cc -c gmaxmin.c

 to generate WE DSP32C object code.

3.  Add Your Object Filenames to a Linker File (ifile)

The next step is to modify the file 

NIDSPLNK

 to add the names of your custom object files to the list of modules to

be linked into your custom DSP Library.  

NIDSPLNK

 is a source file containing link editor directives for the WE

DSP32C tools.  This modification is illustrated in Figure 2-1.

essent.o
stackbld.o

/*** Add all your file names after this comment line ***/
gmaxmin.o

/*** Add all your file names above this comment line ***/

-

l

LVDSP

Figure 2-1.  Linker File 

NIDSPLNK

Copy the 

NIDSPLNK

 file from the 

LIB

 directory to your working directory and then modify the copy.  This ensures

that you maintain the original 

ifile

.  Also, you need to copy the files 

essent.o

, 

dsp_glob.o

, and

stackbld.s

, from the 

LIB

 directory to your working directory.

Add your function(s) name(s) to this file between the comments instructing you to do so.  Do not modify
this file in any other way.

4.  Add Your New Function Names to a Library Function List File

Copy the files 

NIDSP.fnc

 and 

NIESSEN.fnc

 from the 

Dispatch

 directory to your working directory.

In Figure 2-2, the file 

NIDSP.fnc

 shows the addition of the function 

DSP_GMaxMin

 to the library function list.

This is done by editing the file 

NIDSP.fnc

 in the current directory.  Add this function to a new group, 

My

Functions

, at the end of this file.

** My Functions

DSP_GMaxMin

Figure 2-2.  Library Function List File 

NIDSP.fnc