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Evaluation Board Controller
Figure 1. Evaluation Board Controller Main Screen
SOFTWARE DESCRIPTION
The software which controls the Evaluation Board Con-
troller and hence the evaluation board has three main
screens. The screen shown in Figure 1 shows the screen
which appears when the software is run. The main func-
tion of this screen is to allow the user to read a predeter-
mined number of samples from the evaluation board and
display them in both the time and frequency domain. The
screen can be divided into 3 sections. The upper third of
the screen contains the control buttons, the menu bar and
various status windows. The control buttons allow the user
to enter the setup menu, take samples and get information
about the software. The menu bar allows the user to select
which printer port is to be used to control the Evaluation
Board Controller, load and save data etc. The status win-
dows indicate the setup of the evaluation board/device,
number of samples taken and any information/error mes-
sages that are generated.
The middle third of the screen is a Digital Storage Os-
cilloscope (DSO). When samples are uploaded from the
Evaluation Board Controller they are displayed here. The
samples can be displayed either as integer values or as
voltages (determined by the input range of the device in
question). Once samples have been displayed clicking at
any point in the graph will display the sample number and
value of the point directly beneath the cursor. Along the
axis of the graph are the "zoom handles". These allow the
user to zoom in and out to get a closer look at a particular
sample if required. When another set of samples is taken
the graph will attempt to display all values collected unless
the Hold Zoom check box is ticked. In this case the graph
will keep the same axis settings as for the previous set of
data samples. Additional check boxes are provided to give
the user control over the vertical and horizontal grids and
data points.
The lower third of the screen will show either a Fast
Fourier Transform (FFT) of the data or a Histogram
which shows the number of occurrances of each particular
code read back. The FFT (the default option) is typically
used when the user is concerned with examining an ADC's
performance in the frequency domain while the Histogram
will give an indication of the ADC's performance to DC
signals. The option displayed can be toggled by clicking
on the FFT Mode/Histogram Mode button in the top
right of the screen. Figure 2 shows how the main screen
looks when the Histogram Option is selected.
–4–
REV. A
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