UM0382
User guide
EK3LV02DQ
Evaluation Kit
Introduction
The EK3LV02DQ is an Evaluation Kit designed to provide to the user a complete, ready-touse platform for the evaluation of the LIS3LV02DQ, a low-power 3-Axis linear accelerometer
with digital output that includes a sensing element and an IC interface able to take
information from the sensing element and to provide the measured signal to the external
world.
Besides the MEMS sensor, the evaluation board mounts an ST7-USB microcontroller which
acts like a bridge between the sensor and the personal computer on which it is possible to
run either a Graphical User Interface delivered with the kit itself or dedicated SW routines
that implements customized applications.
This user manual describes the HW composing the evaluation kit and gives the informations
required to install and to run the evaluation kit user interface.
For any detail about the features implemented by the LIS3LV02DQ sensor refer to
LIS3LV02DQ datasheet and to the Application Note AN2041
January 2007
Rev 2
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www.st.com
Contents
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Contents
1
Evaluation kit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
EK3LV02DQ GUI installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
2.1
PC system requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3
Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Graphical User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1
Connecting to Virtual the COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2
Registers Read/Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3
Direction detection demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4
Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5
3.4.1
Single Acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4.2
Continuos Acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
About_EK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4
Data acquisition quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
EK lite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6
MEMS pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1
7
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6.1.1
Right Side: Main Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1.2
Left Side: Pointer Application Controls . . . . . . . . . . . . . . . . . . . . . . . . . 24
Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2
Commands Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.3
8
GUI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.2.1
Supported Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2.2
Acquisition Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2.3
Configuration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Main communication command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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Contents
9
Bill Of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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List of tables
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List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
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Acquisition command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Configuration Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Data Field 1 configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Bill Of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Evaluation board block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Top silk-screen for EK3LV02DQ kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Board photograph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Notify icon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Driver installation through the device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
USB driver installation with the Hardware Update Wizard . . . . . . . . . . . . . . . . . . . . . . . . . 10
Virtual COM driver port assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Graphical User Interface: main window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Registers Read/Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EK Demo Mode window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Threshold definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Single Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Continuos Data “Acquisition Control” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Plot Data and Show Data windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Board Axis Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bar Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Inclinometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Axis Inclination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Map Browsing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Evaluation Kit Info and About window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
EK3LV02DQ Lite GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
MEMS Pointer Demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Axis Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Schematic diagram for EK3LV02DQ board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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Evaluation kit description
1
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Evaluation kit description
The EK3LV02DQ is an Evaluation Kit designed to provide the user with a complete, readyto-use platform for the evaluation of the LIS3LV02DQ, a low-power 3-Axis linear
accelerometer with digital output.
The block diagram of the evaluation kit is given in Figure 1.
Figure 1.
Evaluation board block diagram
Control Switches
(Left, Right and Reset)
MEMS
Sensor
SPI
USB
ST72F651
μC
USB
Connector
Power On LED
Data Ready LED
General Purpose LED
Besides the MEMS sensor, the evaluation board mounts an ST7-USB microcontroller which
acts like a bridge between the sensor and the personal computer on which it is possible to
run either a Graphical User Interface delivered with the kit itself or dedicated SW routines
that implements customized applications.
Few switches and LED indicators are also present to control and to monitor the functionality
of the board itself.
The top silk-screen of the board and the photo of the full board are shown respectively in
Figure 2 and in Figure 3.
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Evaluation kit description
Figure 2.
Top silk-screen for EK3LV02DQ kit
Figure 3.
Board photograph
In order to operate the EK3LV02DQ evaluation kit it is required the installation of a dedicated
driver which is delivered onto the CD accompanying the kit itself together with a GUI
interface which allows a simple interaction with the sensor itself. The steps that must be
followed to install the driver and the SW are described in the following section 2.2.
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EK3LV02DQ GUI installation
2
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EK3LV02DQ GUI installation
The installation of Graphical User Interface (GUI) for the EK3LV02DQ implies two steps:
2.1
–
the installation onto the PC of the Software delivered with the evaluation kit;
–
the installation of the Virtual COM driver needed to use the Evaluation Kit board.
PC system requirements
Both the hardware and software that compose the EK3LV02DQ Evaluation Software Kit
have been designed to operate with:
2.2
–
Microsoft® Windows® XP®;
–
Microsoft.NET Framework 1.1 (or higher); this software can be downloaded for
free from the Microsoft web site (a). The installation of the “Microsoft.NET
Framework” is not required when running on windows XP SP2 or higher.
Software installation
To install the SW distributed along with the EK3LV02DQ evaluation kit:
1.
insert the MiniCD delivered with the Kit inside the CD-ROM drive;
2.
if the Autorun screen does not appear, click on Start > Run, enter “D:\Autorun.exe”
and click OK. “D” represents the letter of your CD-ROM drive;
3.
click onto “Evaluation Kit SW Installation” from the “EK3LV02DQ Evaluation Kit” page
which appears;
4.
follow the instructions given by the Installer (Figure 4).
Figure 4.
Software installation
a. http://www.microsoft.com/downloads and search for.Net framework Redistributable Package.
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2.3
EK3LV02DQ GUI installation
Hardware installation
To install the virtual COM driver insert the Evaluation Kit board into a free USB port, look at
the “Notify” icon (Figure 5) and than wait for “Hardware Update Wizard”.
Figure 5.
Notify icon
If the “Hardware Update Wizard” appears as shown in Figure 7 then follow the instructions
given in Figure 7; otherwise follow the instructions indicated in Figure 6 and Figure 7.
Figure 6.
Driver installation through the device manager
Right click on My Computer
Right click on “ST MEMS UNIT” and choose for Update driver
1
2
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EK3LV02DQ GUI installation
Figure 7.
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USB driver installation with the Hardware Update Wizard
3
4
6
5
7
Once the installation has finished, a COM port number will be assigned to the ST Virtual
Com driver (Figure 8). The knowledge of this number is required to run the EK3LV02DQ
Evaluation Software GUI. For additional details, check section 3.1.
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EK3LV02DQ GUI installation
Figure 8.
Virtual COM driver port assignment
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Graphical User Interface
3
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Graphical User Interface
To execute the EK3LV02DQ Evaluation Software Graphical User Interface:
1.
click on Start > All Programs;
2.
select the folder EK3LV02DQ > Executables;
3.
launch the program “EK3LV02DQ Ver.1.0”.
With these operations the GUI main window will appear (Figure 9); the window is composed
of four main sections as detailed below:
1.
the graphical panel (ref1), where the data coming from the sensor are graphically
represented;
2.
the upper-right corner of the window (ref2), which allows to open and to close the
communication port of the PC connected to the Evaluation Kit;
3.
the right side, which contains the “Register Read/Write” and “Direction Detection
Demo” (ref3), “Single Acquisition” (ref4) and “About EK” (ref5) blocks;
4.
the bottom of the window, which handles the continuous acquisition of the acceleration
data and displays them inside the graphical panel (ref6).
Figure 9.
Graphical User Interface: main window
ref1
ref2
ref3
ref4
ref5
ref6
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3.1
Graphical User Interface
Connecting to Virtual the COM port
Before using the functions of the Evaluation Kit Software it is necessary to open the
connection with the EK3LV02DQ board. This is achieved through the following procedure:
1.
connect the EK3LV02DQ to desired USB port;
2.
in the pop-menu “USB ---> Virtual COM” choose the Virtual COM number on which the
board has been mapped. For additional information on how to get this value check
section 2.3;
3.
open the connection by clicking on “Connect” (Figure 9 ref2). Once this procedure is
completed, the General Purpose LED of the board will switch from red to green.
Once the procedure has been completed, the user can acquire, plot and save the
acceleration data measured by the sensor and he/she can access the content of the
registers embedded in the device. Further details about each single function are provided in
the sections hereafter.
Note:
Due to Virtual COM driver communication speed limits, the maximum Output Data Rate
allowed for the device is 640 Hz. Higher Output Data Rate could result in a possible data
loss.
3.2
Registers Read/Write
Through the “Register Read/Write” panel (Figure 9, ref3), the user can either directly write
or read the registers value inside the LIS3LV02DQ device.
In particular, by clicking on the “Read/Write” button a new window appears (Figure 10).
To perform a register read out, the user must select the desired register name into “Reg
Name” pop up menu (ref4) and then he/she must click on the “Read” button (ref2). The
result of the reading will appear in the text box “Reg Value” (ref3).
To write a data into a register, the user must select the desired register name (ref4), choose
the desired value in the text box “Reg Value” (ref3) and then click on the “Write” button
(ref1). In case of read-only registers, the write button is not enabled.
Figure 10. Registers Read/Write
ref4
ref1
ref3
ref2
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Graphical User Interface
3.3
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Direction detection demo
The LIS3LV02DQ allows the implementation of motion-controlled functions such as gaming
and terminal control while requiring reduced computational power to the application
controller. The device, in fact, may be programmed to generate an interrupt signal when a tilt
is detected and to return the information of the direction in which the sensor has been tilted.
With the same feature the LIS3LV02DQ sensor is able to return the information about the
spatial orientation of the board without requiring the reading and the further post-processing
of the acceleration data.
This feature is demonstrated through the Direction Detection demo mode panel (Figure 11)
which is activated by clicking on the “Dir Detect” button present in the main GUI window.
Figure 11. EK Demo Mode window
ref2
ref1
ref4
ref 3
ref5
In order to configure the event which will trigger the interrupt event, the user must select the
desired inner/internal and outer/external threshold (ref1), defining in this way an hysteresis
region that allows to avoid false detections and/or bouncing produced for example by either
spurious vibration or tremor. Whenever the inner thresholds is greater than the outer one,
the hysteresis region will be null and the threshold employed to detect the tilt direction will be
the outer one. A graphical representation of the internal and external thresholds is given in
Figure 12.
Whenever the absolute value of the acceleration signal measured by the sensor either
exceeds the outer threshold or returns below the inner threshold an interrupt signal will be
generated and the General Purpose green LED will blink.
If the user wants to detect the orientation changes removing the DC level of the acceleration
signal applied to the device (i.e. removing the gravity vector), it is possible to enable the High
Pass Filter embedded inside the device by acting on the “High Pass Filter” pop-up menu
(Figure 11, ref2). The cut-off frequency of the filter, which is shown inside the Cutoff
Frequency text box (ref5), is user selectable acting on the High Pass coefficients (ref3) and
on the Output Data Rate (ODR). For further details, please refer to AN2041.
To start the Direction Detection demo mode click on “Start Direction Detection” (ref4).
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Graphical User Interface
Figure 12. Threshold definition
3.4
Data Acquisition
The Data Acquisition panel is split in two sections:
3.4.1
1.
“Single Acquisition” mode (Figure 9, ref4);
2.
“Continuos Acquisition” mode (Figure 9, ref6).
Single Acquisition mode
The “Single Acquisition” mode panel allows the user to perform the measurement of the
acceleration acting on all the three axes. A single read of the acceleration data measured by
the device is done by clicking on the “Acquisition” button (Figure 13, ref1).
This panel allows also to activate and to disable the Self-Test function of the device using
the two radio buttons “Self Test ON” and “Self Test OFF” (Figure 13, ref2). Whenever the
self-test is activated, the proof mass of the sensor is electrostatically deflected and the
acceleration data measured by the sensor will exhibit a change in their DC level as specified
on the datasheet of the part. This function allows to check whether the sensor is working
properly without requiring any mechanical movement of the board mounting the sensor
itself.
Figure 13. Single Data Acquisition
ref2
ref1
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Graphical User Interface
3.4.2
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Continuos Acquisition mode
The section related to “Continuos Acquisition” allows the user to perform a sequence of
acquisitions, to plot and to save the acquired acceleration data under different formats.
In order to start and to stop the data acquisition (and to activate the plotting of data in the
afore said panels) it is necessary to push onto the “START/STOP” button (Figure 14, ref2).
Figure 14. Continuos Data “Acquisition Control”
ref3
ref4
ref2
ref5
ref1
ref6
ref7
ref8
During a Continuous Acquisition Mode, the user can watch the data coming from the
EK3LV02DQ in different graphical windows(b). The windows corresponding to “Plot Data”
and “Show Data” are shown in Figure 15.
Figure 15. Plot Data and Show Data windows
The sign of the acceleration measured by the sensor is related to the axis definition given in
Figure 16.
b. The computational power of the PC on which the GUI is running may affect the maximum number of windows
that can be opened at the same time.
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Graphical User Interface
Figure 16. Board Axis Definition
Z
USB CONNECTOR
Y
X
Clicking on the “Setup” button (Figure 14, ref1) the “Acquisition Setup” window will open.
This window allows to program the output data rate of the LIS3LV02DQ device. By default it
is set to 40Hz (corresponding to a signal bandwidth @ -3dB of 10Hz); to modify this
parameter the user has to select the desired value from the related pop up menu (Figure 14,
ref3).
The “Acquisition Setup” window allows to change also the device Full Scale (Figure 14, ref4)
and to put in tri-state mode the SPI (serial interface) lines of the microcontroller (Figure 14,
ref5). The latter feature has been implemented to guarantee to advanced users the fullcontrol of the MEMS lines through a different source (i.e. from a separate controller).
The section related to “Graphics Amplification” (Figure 14, ref6) allows to zoom the data
plotted on the screen. Please notice that the horizontal and vertical gains do not change the
resolution of the device; they only impact the way in which data are shown on the screen.
Last but not least, the “Acquisition Setup” window allows the user to select the file where the
acquired data values have to be stored (Figure 14, ref7). In particular, the file in which the
data are saved reports the informations about each acquisition session and contains the
acquired samples in three different fields.
In order to apply the settings defined with the “Acquisition Setup” window it is necessary to
push on the “OK” button (Figure 14, ref8). These settings will be used for any subsequent
acquisition (until their next modification) and can not be changed while the acquisition is
running.
The main panel of the GUI allows also to plot the acceleration data in three ways (Figure 9,
ref6):
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Graphical User Interface
1.
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as a Bar Chart (Figure 17);
Figure 17. Bar Chart
2.
as Inclinometers (Figure 18), where the inclination is related to the axes definition given
in Figure 19;
Figure 18. Inclinometer
Figure 19. Axis Inclination
+90°
0°
x,y,z
-90°
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horizontal plane
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Graphical User Interface
3.
to navigate through a map (Map Browsing) (Figure 20). The image to be shown is
selected through the “Load Image” button. A map stored inside the file “mapamundi.jpg” is provided as an example.
Figure 20. Map Browsing
3.5
About_EK
Clicking on the “About_EK” button located into the “About EK” section (Figure 9, ref5) it is
possible to obtain informations about the version of the GUI, about the firmware running on
the Evaluation Kit and about the version MEMS accelerometer mounted onto the board.
These information are retrieved by using the buttons “Mounted Device” and “Software
Version” which are shown in “Evaluation Kit Info” window (Figure 21). Once the information
about the device are displayed on the screen it is possible to get an explanation of their
meaning by moving the mouse over the different parts of the device name (LIS 3LV 02 DQ).
Please notice that if the connection is not working properly an error message will be shown.
This feature allows to test the connection between the board and the host computer.
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Graphical User Interface
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Figure 21. Evaluation Kit Info and About window
The second button (“About”) of the “About EK” section (Figure 9, ref5) opens the “MBU_info”
window which shows general informations about the software and provides the user with a
direct link to the ST MEMS page.
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4
Data acquisition quick start
Data acquisition quick start
This section describes the basic steps that have to be performed to acquire the acceleration
data from the EK3LV02DQ:
1.
connect the EK3L02DL to the USB port;
2.
start the EK3LV02DQ GUI;
3.
select the Virtual COM port and then click on the “Connect” button (Figure 9, ref2);
4.
select the destination file in which the acceleration data must be saved by clicking onto
“Setup” (Figure 14, ref1) and “Destination File” (Figure 14, ref7) buttons;
5.
optionally select the desired decimation factor, Horizontal and Vertical gain and then
click on the “OK” button (Figure 14, ref8);
6.
click on “Plot Data” or “Show Data” (Figure 9, ref6) to activate the corresponding Data
Display window (Figure 15);
7.
click on “Browsing” button to activate the function of map browsing (Figure 9, ref6) and
then load the desired image by clicking on “Load Image” button;
8.
click on “START” (”STOP”) button to activate (stop) the collection of data from the
sensor, their saving onto file and plotting on the screen;
9.
to close the application click on Disconnect and then click on Exit.
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EK lite
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EK lite
The mini-CD delivered with the EK3LV02DQ contains also a lite version of the previous GUI
together with its source code. The source code can be found in the directory:
($Home)\STM\EK3LV02DQ\EK3LVDQ_lite
where ($Home) represents the directory in which the SW delivered with the evaluation kit
has been installed (C:\Program Files by default).
The intention is to provide to the user a guidance to the development of his/her own
customized application.
The evaluation kit is started by launching the executable EK3LV02DQ Lite which is
contained in the EK3LV02DQ > Executables folder.
The graphical aspect of the GUI associated to the application is shown in Figure 22.
Figure 22. EK3LV02DQ Lite GUI
In order to operate the SW it is suggested to follow these instructions:
1.
connect the EK3LV02DQ to the USB port
2.
start the GUI for EK3LV02DQ Lite;
3.
select the Virtual COM port and then click on the “Connect” button;
4.
optionally select the destination file in which the acceleration data must be saved by
clicking onto “Setup” and “Destination File” buttons;
5.
click on “Plot Data” to activate the corresponding Data Display window;
6.
click on “START” (”STOP”) button to activate (stop) the collection of data from the
sensor, their saving onto file and plotting on the screen;
7.
to close the application click on Disconnect and then click on Exit.
The GUI allows also the Read/Write the registers embedded in the LIS3LV02DQ device
mounted on the board and to perform a single read of the acceleration data measured by
sensor.
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6
MEMS pointer
MEMS pointer
This section describes the usage of a simple pointer application which employes the
acceleration data provided by the LIS3LV02DQ MEMS 3-axis linear accelerometer to control
the position of a pointer on the screen of the PC. More in details, the SW provided with the
kit itself allows to employ the board provided with the EK3LV02DQ Evaluation Kit as an inertial
mouse where the tilt of the board is transformed into a movement of the pointer. The board
emulates also the left and right buttons of the mouse.
6.1
GUI description
The GUI window (see Figure 23) may be split up into two sections: the right side contains
the main controls to open the connection to the Evaluation Kit and to start/stop the data
acquisition whereas the left side is dedicated to the pointer application controls.
Figure 23. MEMS Pointer Demo
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MEMS pointer
6.1.1
UM0382
Right Side: Main Controls
The buttons present on the right side of the GUI and their related function are described
hereafter:
6.1.2
–
Connection control: selects the COM port on which the EK board is connected to.
–
Acquisition control: starts and stops the acquisition.
–
Exit: exits from the MEMS Pointer Demo application.
Left Side: Pointer Application Controls
The controls present on the left side of the GUI and their related function are the followings:
–
Left Button/Right Buttons: inform on whether the left/right button present on the
Evaluation Kit is pressed.
–
X/Y-Position: shows the actual x/y coordinates of the mouse pointer on the PC
screen.
–
X/Y-Deg: shows the tilt of the Evaluation Kit along the X and Y directions which are
defined as depicted in Figure 24.
–
Tilt Control: allows to select the direction of the vertical displacement on the
screen Vs. the direction in which the board is tilted. In particular, by selecting UP
the pointer will move upward by forward tilting the Evaluation Kit. Vice versa, by
selecting DOWN the pointer will move downwards whenever the board is tilted
backward.
–
Pointer Speed: sets the sensitivity of the pointer to the inclination of the board.
Figure 24. Axis Orientation
Y
X
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7
Supported commands
Supported commands
The EK3LV02DQ board is equipped with a dedicated firmware which supports a set of
commands that allow to control the 3-axis digital output MEMS sensor mounted on the
board and to acquire the measured acceleration data.
The firmware handles also the communication between the EK board and the PC through
the USB bus. Through the usage of these commands it is possible to control the 3-axis
digital output MEMS sensor mounted on the board and to acquire the measured
acceleration data, thus allowing the user to easy write his/her own applications which exploit
the mounted accelerometer.
This section describes the commands that are supported by the firmware loaded onto the
microcontroller of the EK3LV02DQ Evaluation Kit.
7.1
Getting Started
Before using the commands described in the next paragraphs, the following procedure must
be performed:
1.
connect the EK3LV02DQ to the USB port;
2.
start an appropriate software which allows to send the command through the Virtual
serial port. The remaining part of this document will suppose the usage of the “Hyper
Terminal”;
3.
create a new connection; for example name it “EK3LV02DQ” and click OK;
4.
in the “Connect Using” field select the right Virtual COM port onto which the USB port
has been mapped;
5.
set the port to 11500 Bit per second, 8 Data bits, Parity None, 1 Stop bit, Flow control
None and then click OK.
Once this procedure has been completed the user can send to the EK3LV02DQ the
commands described in the following sections by typing the commands themselves in the
“Hyper Terminal” window.
7.2
Commands Description
The EK3LV02DQ board is equipped with “eklvdq-ver1.0.0” firmware. This firmware supports
a set of commands which allow to control the 3-axis digital output MEMS sensor mounted
on the board and to acquire the measured acceleration data. The firmware handles also the
communication between the EK board and the PC.
In particular the communication of the EK3LV02DQ evaluation kit is implemented upon USB
ver 2.0.
7.2.1
Supported Commands
The commands supported by the EK3LV02DQ FW are divided into two different classes:
–
Acquisition commands;
–
Configuration commands.
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Supported commands
UM0382
Each command sent to the Evaluation Kit is composed of four fields. Before and between
the different field it is located a fixed code “ek” ASCII “65hex 6Bhex”, the whole string is
reported below:
65h 6Bh
OpCode
65h 6Bh
DF 1
65h 6Bh
DF2
65h 6Bh
DF3
The “OpCode” (Operative code) field defines the command given to the evaluation kit, while
DF1, DF2 and DF3 defines the commands attribute, the fixed field is used as a trigger for
the communication.
In the next paragraphs will be explained only the OpCode and DF.
7.2.2
Acquisition Commands
The commands belonging to the Acquisition class commands are described in the following
table:
Table 1.
Acquisition command
Cmd Code
Cmd name
Description
ASCII
Hex
Start
Oonn
4F 6F 6E 6E
start data acquisition
Stop
Ooff
4F 6F 66 66
stop data acquisition
SD
Ooua
4F 6F 75 61
single data acquisition
SV
Oovs
4F 6F 76 73
retrieve EK software version
DI
Oodi
4F 6F 64 69
retrieve device information
Start: the start command is used to start data acquisition. When the start command is sent
the board returns the acceleration data measured by the LIS3LV02DQ device.
In particular the output string is composed of eight bytes: “s t Xh Xl Yh Yl Zh Zl SD”. The first
two bytes “s” and “t” are always the hexadecimal values {73 74}, while “Xh” “Yh” “Zh”
represent the upper part of the acceleration data on the X, Y, Z axes and “Xl” “Yl” “Zl”
describe the lower part of the acceleration data on the X, Y, Z axes, the “SD” “Service Data”
gives to the user further information about the switches mounted on the board: in detail bit#1
and bit#0 of the “service data” correspond to switches SW3 and SW2 on the Evaluation Kit
board (see EK3LV02DQ_User_Guide_ver.1.0.pdf).
Stop: the stop command is used to interrupt the acquisition session.
SD: the SD command activate a single data coming from LIS device. The output string is the
same of the start and F start command but the output string is sent just one time.
SV: the SV command is used to retrieve the version of the firmware loaded onto the
Evaluation Kit. The output is an ASCII string looking like this: “eklvdq-vx.x.x”.
DI: the DI command is used to retrieve informations about the MEMS device mounted on the
Evaluation Kit Board. The output is an ASCII string looking like this: “LIS3LV02DQ QFN 28".
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7.2.3
Supported commands
Configuration Commands
The Configuration class commands are described in the following table.
Table 2.
Configuration Command
Command Code
Cmd
Description
ASCII
Hex
Write
w (adr) (data) (xxx)
77 (adr) (data) (xxx)
write data byte into register adr
WriteBit
W (adr) (bit #) (t/f)
57 (adr) (bit #) (t/f)
write bit # into the reg adr
Read
r (adr) (xxx) (xxx)
72 (adr) (xxx) (xxx)
read data byte from register adr
ReadBit
R (adr) (bit #) (t/f)
52 (adr) (bit #) (t/f)
read bit # from reg adr
Set
S(DF1)(DF2)(DF3)
53 (DF1) (DF2) (DF3)
special mode setting
Write: this command is used to write a byte inside an accelerometer register. The address is
identified by the byte (adr) while the data to be written is represented by the third field (data).
WriteBit: this command is used to write a single bit inside an accelerometer register at
position bit #. The address is identified by the byte (adr) while the data to be written is
represented by the third field (t/f) true (to set the bit high) and false (reset the bit) where the
two data are t {74} and f {66}.
Read: read command allows to read the data present inside the LIS device register. The
(adr) value is the EK3LV02DQ register address that the customer desires to read. The
output string is composed by nine fields “RV reg_data reg_adr”, with R and V is the string with
value {52 56}, the reg_data is the register content and reg_adr is its address. The other five fields
can be considered as don’t care.
ReadBit: read command allows to read the data present inside the EK3LV02DQ device
register. The (adr) value is the LIS register address of the register that the customer desires
to read. The output string is composed by “bit#7 bit#6 bit#5 bit#4 bit#3 bit#2 bit#1 bit#0
reg_data “, where bit#0....bit#7 are the eight bit contained in the register with address given by
reg_adr.
Set: this command allows the user able to change some settings of the firmware of the
Evaluation Kit. DF1, Data Field1, is used to identify which feature the user wants to change;
DF2, Data Field 2 and DF3, Data Field 3 contains the new data value to associate to the
function specified by DF1. In particular DF1 is composed by the following configuration
command:.
Table 3.
Data Field 1 configuration
Cfg Code
Cfg Cmd
3-state
Description
ASCII
Hex
A
41
SPI three state function
27/32
Supported commands
7.3
UM0382
Main communication commands
This section shows the basic sequence of commands to start a data communication session
and to retrieve the acceleration data from Evaluation kit:
The first step is to connect the board and to bring the microcontroller out from 3-state mode:
ek S ek A ek 0 ek 0 (ASCII) --> 65 68 53 65 68 41 65 68 30 65 68 30 (Hex)
with these two command user can start the single data acquire session:
ek O ek o ek u ek a (ASCII) --> 65 68 4F 65 68 6F 65 68 75 65 68 61 (Hex)
or continue data acquisition:
ek O ek o ek n ek n (ASCII) --> 65 68 4F 65 68 6F 65 68 6E 65 68 6E (Hex)
the command to stop the acquire session is:
ek O ek o ek f ek f (ASCII) --> 65 68 4F 65 68 6F 65 68 66 65 68 66 (Hex)
In the same way the user can retrieve informations from the Evaluation Kit such as the
version of the Firmware loaded onto the microcontroller.
Note:
28/32
The commands supported by the Evaluation Kit are intended for the usage with a dedicated
SW written by the user and running on PC. The method described above involving the
usage of the hyper terminal is only intended to help the user to understand how to handle
the communication with the board and not to acquire, to set and to manipulate data.
USB_B
V+
DM
DP
GND
J1
D1
1
2
3
4
C8
47nF
R6
1K5
R1
180R
C9
220nF
C10
+ 10uF
Rled
Gled
Vddf
+
VCC
C1
10uF
R7
10K
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
C4
C2
100nF 4u7F +
C5
100nF
UV ss
UD M
UD P
UV cc
UV dd
Vd d f
Vs sf
PE5
PE6
PE7
PB0
PB1
PB2
PB3
PB4
PB5
64oscout
63osci n
62
61
60
59
58iccdata
57iccclk
56
55
54
53
52
51nRESET
50iccsel
49
SW2
SW3
R8
10K
C3
4u7F
PW M 0
AI N 6
AI N 5
AI N 4
AI N 3
AI N 2
OC M P2
OC M P1
PD 3
PD 2
PD 1
PD 0
PC 7
PC 6
PC 5
PC 4
OS C OU T
OS C I N
V ss2
V ssa
Vd d a
Vd d 2
I CCD A T A
ICC C L K
US B EN
AI N 1
AI N 0
SD A
SCL
RE SET
V pp /I CCSE L
PW M1
PB6
PB7
PA 0
PA 1
PA 2
PA 3
PA 4
PA 5
PA 6
PA 7
SS
MI SO
MO SI
SCK
Vd d 1
Vs s1
17
18
19
20
cs_pad 21
22
23
data_read 24
25
26
27
28
29
30
31
32
+
VCC
48
47
46
45
44
43
42
41
40
39
38
37
36 CS1
35 CS2
34
33
C6
100nF
U2
ST7265X_TQFP64
MPD
Cosc1
33pF
oscin
Gled
D4
Rled
R2
100R
Vddf
12MHz
Yoscm1
R3
100R
Application Lab.
EK3LV02DQ
G
Vddf
miso
mosi
sck
R
J3
SPI
Cosc2
33pF
oscout
CS2
CS1
sck
miso
mosi
data_ready
cs_pad
TP1
VCC
D3
ICP
1
3
5
7
9
J2
2
4
6
8
10
R5
100R
iccdata
iccclk
nRESET
iccsel
data_ready
Vddf
NC
GND
Vdd
Reserved
GND
RDY/INT
NC
Riccsel
10K
1
2
3
4
5
6
7
28
27
26
25
24
23
22
SW1
NReset
C7
100nF
NC
Reserved
Vdd
Reserved
GND
CK
NC
NC
NC
NC
NC
NC
NC
NC
NC
SDO
SDA/SDI/ SDO
Vdd_IO
SCL/SPC
CS
NC
8
9
10
11
12
13
14
miso
mosi
Vddf
sck
cs_pad
21
20
19
18
17
16
15
Vddf
U1
LI S3LV0 2DQ
8
7
6
5
4
3
2
1
UM0382
Schematic diagram
Schematic diagram
The schematic diagram of the EK3LV02DQ evaluation kit is shown in Figure 25.
Figure 25. Schematic diagram for EK3LV02DQ board
29/32
Bill Of Material
9
UM0382
Bill Of Material
The Bill of Material for the EK3LV02DQ evaluation kit is given in Table 4.
Table 4.
30/32
Bill Of Material
Designator
Description
Comment
Footprint
C1
Capacitor
10u
C1206_POL
C2
Capacitor
4u7
C1206_POL
C3
Capacitor
4u7
C1206_POL
C4
Capacitor
100n
0805
C5
Capacitor
100n
0805
C6
Capacitor
100n
0805
C7
Capacitor
100n
0805
C8
Capacitor
47n
0805
C9
Capacitor
220n
0805
C10
Capacitor
10u
C1206_POL
Cosc1
Capacitor
33p
0805
Cosc2
Capacitor
33p
0805
D1
LED_SMD
SMD_LED red
SMD_LED
D3
LED_SMD
SMD_LED green
SMD_LED
D4
LED_SMD
SMD_LED red/green
SMD_LED_3C
J1
USB connector
USB_B
USB_B
J2
Header, 5x2
ICP
HEADER_5X2_A
J3
Header, 7-Pin
SPI
HDR1X7
R1
Resistor
180R
0805
R2
Resistor
100R
0805
R3
Resistor
100R
0805
R5
Resistor
100R
0805
R6
Resistor
1k5
0805
R7
Resistor
10K
0805
R8
Resistor
10K
0805
Riccsel1
Resistor
10k
0805
SW1
Button
NReset
SMT_Button
SW2
Button
SMT_Button
SMT_Button
SW3
Button
SMT_ButtonQ
SMT_Button
U1
Accelerometer
LIS3LV02DQ
QFN28LD_NODIE5x5
U2
ST7 microcontroller
ST72F651AR6T1E
TQFP64_10x10
Yoscm1
Crystal
12MHz
OSC_SMD
UM0382
10
Revision history
Revision history
Table 5.
Document revision history
Date
Revision
Changes
2-Jan-2007
1
Initial release.
26-Jan-2007
2
The document now contains the User Manual, the Command
Description, the Schematic and the BOM.
31/32
UM0382
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