Cirrus Logic CDB5529 - Manual (Page 8)

CDB5529
8 DS246DB1
The evaluation software was developed with Lab
Windows/CVI
TM , a software development package
from National Instruments. More sophisticated
analysis software can be developed by purchasing
the development package from National Instru-
ments (512-794-0100).
Menu Bars Overview
The menu bar controls the link between windows
and allows the user to exit the program. It also al-
lows the user to initialize the serial port and load
presaved data conversions from a file. The five
principal windows are the START UP CONFIGU-
RATION (also referred to as the Setup Window),
the Input / Output Window, the Histogram Win-
dow, the Power Spectrum Window (also referred to
as the FFT window), and the Time Domain Win-
dow.
Specifically, the menu bar has the following con-
trol items:
Menu: To select, click on option Menu from the
menu bar, or use associated hot keys. The items as-
sociated with MENU are listed and described below.
Setup Window (F1)
Input/Output Window (F2)
Histogram Window (F3)
Power Spectrum Window (F4)
Time Domain Window (F5)
These five menu items allow the user to navigate
between the five windows. They are available at all
times via the menu bar or hot keys.
SETUP: To select, click on option Setup from the
menu bar. The functions available under Setup are:
COM1: When selected, COM1 is initialized to
9600 baud, no parity, 8 data bits, and 1 stop bit.
COM2: When selected, COM2 is initialized to
9600 baud, no parity, 8 data bits, and 1 stop bit.
Load From Disk: Used to load and display previ-
ously saved data conversions from a file. The file
must comply with the CDBCAPTURE file save
format. The format is: part number, number of bits,
number of conversions, maximum range, and the
data conversions. The user is prompted to enter the
path and file name of previously saved data. To
prevent hardware conflicts, this option is deactivat-
ed while in the Input/Output Window.
TESTRS232: This test mode tests the ability of the
PC to communicate to the evaluation board. It con-
sists of two subtests: 1) test the link between the
PC and the RS-232 interface circuitry; and 2) test
the RS-232 link between the PC and the microcon-
troller. HDR7 distinguishes these two subtests. Set
HDR7 to Normal to test the complete communica-
tion link. Or set HDR7 to Loop Back to test the link
between the RS-232 Circuitry and the PC. Then,
set the test switches to 110 and reset the evaluation
board. The LED’s should indicate a binary six sig-
nifying that the hardware is ready to initiate the
test. To complete the test, the user must initialize
the PC. First, use the SETUP menu to select a com-
munications port and then select the TESTRS232
option. From there, prompts navigate the user
through the test. The PC indicates if the test passes
or fails. Once either test is complete, the LED’s
toggle to indicate that the test mode is complete.
QUIT: Allows user to exit program.
Input/Output Window Overview
The Input/Output Window allows the user to read
and write to the internal register of the converter in
either binary or hexadecimal, and acquire real-time
conversions. It has quick access control icons that
quickly reset the converter, reset the converter’s se-
rial port, or self-calibrate the converter’s offset and
gain. The following are controls and indicators as-
sociated with this window.
Acquire: This is a control icon. When pressed, the
PC transmits the collect single conversion command