33FJ128GP708 datasheet(52/90 Pages) MICROCHIP

52 / 90 page

dsPIC33F

DS70155C-page 50

Preliminary

11.4.1

SIGNAL GENERATION

dsPICworks™ Data Analysis and DSP Software support

an extensive set of signal generators, including basic

sine, square and triangle wave generators, as well as

advanced generators for window functions, unit step,

unit sample, sine, exponential and noise functions.

Noise, with specified distribution, can be added to any

signal. Signals can be generated as 32-bit floating-point,

or as 16-bit fractional fixed-point values, for any desired

sampling rate. The length of the generated signal is

limited only by available disk space. Signals can be

imported or exported from or to MPLAB IDE file register

windows. Multi-channel data can be created by a set of

multiplexing functions.

11.4.2

DIGITAL SIGNAL PROCESSING

(DSP) AND ARITHMETIC

OPERATIONS

dsPICworks Data Analysis and DSP Software have a

wide range of DSP and arithmetic functions that can be

applied to signals. Standard DSP functions include

transform operations: FFT and DCT, convolution and

correlation, signal decimation, signal interpolation

sample rate conversion and digital filtering. Digital

filtering is an important part of the dsPICworks tool. It

uses filters designed by the sister-application, dsPIC

DSC Filter Design, and applies them to synthesized or

imported signals. The dsPICworks tool also features

special operations, such as signal clipping, scaling and

quantization, all of which are vital in real practical

analysis of DSP algorithms.

11.4.3

DISPLAY AND MEASUREMENT

dsPICworks Data Analysis and DSP Software have a

wide variety of display and measurement options.

Frequency domain data may be plotted in the form of

2-dimensional

‘spectrogram’

and

3-dimensional

‘waterfall’ options. The signals can be measured

accurately by a simple mouse click. The log window

shows current cursor coordinates, as well as derived

values, such as the difference from last position and

signal frequency. Signal strength can be measured

over a particular range of frequencies. Special support

also exists for displaying multi-channel and multiplexed

data. Graphs allow zoom options. The user can choose

from a set of color scheme options to customize display

settings.

11.4.4

FILE IMPORT/EXPORT – MPLAB

IDE AND MPLAB ASM30 SUPPORT

dsPICworks Data Analysis and DSP Software allow

data to be imported from the external world in the form

of ASCII text or binary files. Conversely, it also allows

data to be exported out in the form of files. The

dsPICworks tool supports all file formats supported by

the MPLAB import/export table. This feature allows the

user to bring real-world data from MPLAB IDE into the

dsPICworks tool for analysis. The dsPICworks tool can

also create ASM30 assembler files that can be

included into the MPLAB workspace.

11.5

Digital Filter Design Software Utility

The Digital Filter Design tool for the dsPIC33F 16-bit

digital signal controllers makes designing, analyzing and

implementing Finite Impulse Response (FIR) and Infinite

Impulse Response (IIR) digital filters easy through a

menu-driven, user-intuitive interface. This tool performs

complex mathematical computations for filter design,

provides superior graphical displays and generates

comprehensive design reports. Desired filter frequency

specifications are entered and the tool automatically

generates the filter code and coefficient files ready to

use in the MPLAB Integrated Development Environment

(IDE). System analysis of the filter transfer function is

supported with multiple generated graphs, such as

magnitude, phase, group delay, log magnitude, impulse

response and pole/zero locations.

FIGURE 11-2:

DIGITAL FILTER DESIGN

TOOL INTERFACE

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