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This chapter contains an overview of the NI-DSP Interface Utilities, installation instructions, and explains how to
use the NI-DSP Interface Utilities.  You should familiarize yourself with the material in this chapter before
beginning subsequent chapters in this part.

The National Instruments AT-DSP2200, a high-performance digital signal processing (DSP) plug-in board for the
PC, is based on the AT&T WE DSP32C 32-bit, floating-point, digital signal processor.  With the NI-DSP
Interface Utilities, you can customize the DSP Library that resides on the board by adding or deleting functions to
and from the common object file format (COFF) file that constitutes the onboard-resident software.  This COFF
file is made of the Kernel, memory management routines, execution control routines, data communication
routines, interrupt handling routines for data acquisition, and a set of more than 60 analysis functions.  Throughout
the chapters in this part, the COFF file is referred to as the DSP Library.  By customizing the DSP Library, you
can change the number of analysis functions that are included.  The other parts of the DSP Library always remain
unchanged.

To customize the DSP Library that resides on the board, you need to have the Developer ToolKit,
available through National Instruments, which contains an AT&T C compiler, assembler, linker, and
documentation.

The NI-DSP Interface Utilities are on the NI-DSP for LabVIEW for Windows distribution disks.

Unless otherwise stated, all references to directories in this part of the manual are to subdirectories under the path
you specified during installation of the NI-DSP Interface Utilities.  If you chose the path 

D:\DEVEL

, then the

installer will create the directory 

DEVEL

 and copy all files and directories to it.  Figure 1-1 shows directory

structure created by 

SETUP

.

D:\DEVEL

Examples

Dispatch

Lib

Figure 1-1.  NI-DSP for DOS Directory Structure

The 

Dispatch

 directory contains the utilities necessary for creating a custom DSP Library dispatcher.  The

Dispatch

 directory contains the 

Dispatch

 application and the files  

NIDSP.fnc

, 

dispatch.s

., and

NIESSEN.fnc

.

Dispatch

 is a PC application that uses the files 

NIDSP.fnc

 and 

NIESSEN.fnc

 and generates the

WE DSP32C assembly code needed to properly dispatch to a custom DSP Library based on the grouped function
names.