UM0285 User guide
EK3LV02DL Evaluation Kit
Introduction
The EK3LV02DL is an Evaluation Kit designed to provide to the user a complete, ready-touse platform for the evaluation of the LIS3LV02DL, 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 LIS3LV02DL sensor refer to LIS3LV02DL datasheet and to the Application Note AN2381
September 2006
Rev 1
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www.st.com
Contents
UM0285
Contents
1 2 Evaluation kit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 EK3LV02DL GUI installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 2.2 2.3 PC system requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3
Graphical User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 3.2 3.3 3.4 Connecting to Virtual the COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Registers Read/Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Direction detection demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Data Acquisition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.4.1 3.4.2 Single Acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Continuos Acquisition mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.5
About_EK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 5 6
Data acquisition quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 EK lite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 MEMS pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1 GUI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1.1 6.1.2 Right Side: Main Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Left Side: Pointer Application Controls . . . . . . . . . . . . . . . . . . . . . . . . . 24
7
Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 7.2 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Suppor ted Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 Star t command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Debug command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Stop command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Registers read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Registers write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Single bit write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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UM0285 7.2.7 7.2.8 7.2.9
Contents Zon and Zoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Device name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Firmware version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.3
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 9 10
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Bill Of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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List of tables
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List of tables
Table 1. Table 2. Table 3. Supported commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 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 EK3LV02DL 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 EK3LV02DL Lite GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 MEMS Pointer Demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Axis Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Schematic diagram for EK3LV02DL board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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Evaluation kit description
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1
Evaluation kit description
The EK3LV02DL is an Evaluation Kit designed to provide the user with a complete, ready-touse platform for the evaluation of the LIS3LV02DL, 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 ST72F651 C
USB
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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UM0285 Figure 2. Top silk-screen for EK3LV02DL kit
Evaluation kit description
Figure 3.
Board photograph
In order to operate the EK3LV02DL 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.
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EK3LV02DL GUI installation
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2
EK3LV02DL GUI installation
The installation of Graphical User Interface (GUI) for the EK3LV02DL implies two steps: 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.
2.1
PC system requirements
Both the hardware and software that compose the EK3LV02DL Evaluation Software Kit have been designed to operate with: 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.
2.2
Software installation
To install the SW distributed along with the EK3LV02DL evaluation kit: 1. 2. 3. 4. Insert the MiniCD delivered with the Kit inside the CD-ROM drive 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. Click onto "Evaluation Kit SW Installation" from the "EK3LV02DL Evaluation Kit" page which appears; Follow the instructions given by the Installer (Figure 4). Software installation
Figure 4.
a. http://www.microsoft.com/downloads and search for.Net framework Redistributable Package.
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EK3LV02DL GUI installation
2.3
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 "ST MEMS UNIT" and choose for Update driver
Right click on My Computer 1
2
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EK3LV02DL GUI installation Figure 7. USB driver installation with the Hardware Update Wizard
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3 4
5
6
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 EK3LV02DL Evaluation Software GUI. For additional details, check section 3.1.
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UM0285 Figure 8. Virtual COM driver port assignment
EK3LV02DL GUI installation
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Graphical User Interface
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3
Graphical User Interface
To execute the EK3LV02DL Evaluation Software Graphical User Interface: 1. 2. 3. Click on Start > All Programs Select the folder EK3LV02DL > Executables Launch the program "EK3LV02DL 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. 2. 3. 4. the graphical panel (ref1), where the data coming from the sensor are graphically represented; 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; the right side, which contains the "Register Read/Write" and "Direction Detection Demo" (ref3), "Single Acquisition" (ref4) and "About EK" (ref5) blocks; the bottom of the window, which handles the continuous acquisition of the acceleration data and displays them inside the graphical panel (ref6). Graphical User Interface: main window
Figure 9.
ref1 ref2 ref3
ref4
ref5
ref6
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Graphical User Interface
3.1
Connecting to Virtual the COM port
Before using the functions of the Evaluation Kit Software it is necessary to open the connection with the EK3LV02DL board. This is achieved through the following procedure: 1. 2. Connect the EK3LV02DL to desired USB port; 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. 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.
3.
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 LIS3LV02DL 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 ref3
ref1 ref2
3.3
Direction detection demo
The LIS3LV02DL allows the implementation of motion-controlled functions such as gaming and terminal control while requiring reduced computational power to the application
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Graphical User Interface
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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 LIS3LV02DL 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
ref3
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 AN2381. To start the Direction Detection demo mode click on "Start Direction Detection" (ref4).
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UM0285 Figure 12. Threshold definition
Graphical User Interface
3.4
Data Acquisition
The Data Acquisition panel is split in two sections: 1. 2. "Single Acquisition" mode (Figure 9, ref4) "Continuos Acquisition" mode (Figure 9, ref6).
3.4.1
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
3.4.2
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).
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Graphical User Interface Figure 14. Continuos Data "Acquisition Control"
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ref3 ref4 ref2 ref5
ref1
ref6
ref7
ref8
During a Continuous Acquisition Mode, the user can watch the data coming from the EK3LV02DL 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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UM0285 Figure 16. Board Axis Definition
Z
Graphical User Interface
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 datarate of the LIS3LV02DL 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 lines of the microcontroller SPI serial interface (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, ref5) 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 on 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. as a Bar Chart (Figure 17);
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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
horizontal plane
-90
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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 DL). 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 Figure 21. Evaluation Kit Info and About window
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The second button ("About") present into 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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Data acquisition quick start
4
Data acquisition quick start
This section describes the basic steps that have to be performed to acquire the acceleration data from the EK3LV02DL. 1. 2. 3. 4. 5. 6. 7. 8. 9. Connect the EK3L02DL to the USB port Start the EK3LV02DL GUI; Select the Virtual COM port and then click on the "Connect" button (Figure 9, ref2) Select the destination file in which the acceleration data must be saved by clicking onto "Setup" (Figure 14, ref1) and "Destination File" (Figure 14, ref6) buttons; Optionally select the desired decimation factor, Horizontal and Vertical gain and then click on the "OK" button (Figure 14, ref7). Click on "Plot Data" or "Show Data" (Figure 9, ref6) to activate the corresponding Data Display window (Figure 15). 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. Click on "START" ("STOP") button to activate (stop) the collection of data from the sensor, their saving onto file and plotting on the screen. To close the application click on Disconnect and then click on Exit.
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EK lite
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5
EK lite
The mini-CD delivered with the EK3LV02DL contains also a lite version of the previous GUI together with its source code. The source code can be found in the directory: ($Home)\STM\EK3LV02DL\EK3LVDL_lite where ($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 EK3LV02DL 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. EK3LV02DL Lite GUI
In order to operate the SW it is suggested to follow these instructions: 1. 2. 3. 4. 5. 6. 7. Connect the EK3LV02DL to the USB port Start the GUI for EK3LV02DL Lite; Select the Virtual COM port and then click on the "Connect" button; Optionally select the destination file in which the acceleration data must be saved by clicking onto "Setup" and "Destination File" buttons; Click on "Plot Data" to activate the corresponding Data Display window; Click on "START" ("STOP") button to activate (stop) the collection of data from the sensor, their saving onto file and plotting on the screen. To close the application click on Disconnect and then click on Exit.
The GUI allows also the Read/Write the registers embedded in the LIS3LV02DL device mounted on the board and to perform a single read of the acceleration data measured by sensor.
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MEMS pointer
6
MEMS pointer
This section describes the usage of a simple pointer application which employes the acceleration data provided by the LIS3LV02DL 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
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6.1.1
Right Side: Main Controls
The buttons present on the right side of the GUI and their related function are described hereafter: 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.
6.1.2
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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Supported commands
7
Supported commands
The EK3LV02DL 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 EK3LV02DL Evaluation Kit.
7.1
Getting Started
Before using the commands described in the next paragraphs, the following procedure must be performed: 1. 2. Connect the EK3LV02DL to the USB port 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". Create a new connection; for example name it "EK3LV02DL" and click OK; In the "Connect Using" field select the right Virtual COM port onto which the USB port has been mapped. Set the port to 115200 Bit per second, 8 Data bits, Parity None; 1 Stop bit, Flow control None and then click OK. In the Hyper Terminal select "Files > Properties > Settings" and then click onto the "ASCII Setup" button. Select "Send line ends with line feeds" and "Echo typed characters locally". Click onto OK button to close the "ASCII Setup" window. Click onto OK button to close the "Properties" window.
3. 4. 5. 6. 7. 8. 9.
Once this procedure has been completed the user can send to the EK3LV02DL the commands described in the following sections by typing the commands themselves in the "Hyper Terminal" window.
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Supported commands
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7.2
Supported Commands
The table below enlists the commands that are supported by the EK3LV02DL FW: Table 1. Supported commands
Description Star t continuous data acquisition Returns the acceleration data in readable text format Stop data acquisition Register's read Register's write Single bit write Force 3-state Exit from 3-state Device Name Firmware Version 3LV02DL LVDL1.0 RAAhDDh Returned value STxxyyzzs x=XX y=YY z=ZZ
Command *star t *debug *stop *rAA *wAADD *bwAA<0:7><0|1> *Zon *Zoff *dev *ver
Note:
AA: register address DD: data S: service field XX, YY, ZZ: Acceleration data returned for the X, Y and Z axes
7.2.1
Start command
The *start command allows to start the continuous data acquisition. When this command is sent to the board it returns the acceleration data measured by the LIS3LV02DL device. The acceleration data are packed in a string composed of eight bytes: "s t Xh Xl Yh Yl Zh Zl SD". The first two bytes are always "s" and "t" which correspond to the hexadecimal values {73 74}, while "Xh" "Yh" "Zh" and "Xl" "Yl" "Zl" represent respectively the upper part and the lower-part of the acceleration data for the X, Y, Z axes. The last byte "s" returns the information about the switches mounted on the board: in detail bit#1 and bit#0 of the "service data" correspond to the status of SW3 and SW2 on the Evaluation Kit board and they are set to 1 when the corresponding switch is pressed.
7.2.2
Debug command
The *debug command starts the continuos data acquisition. When this command is sent to the board it returns the acceleration data measured by the LIS3LV02DL device in readable text format. The values shown on the screen correspond to the content of the output data registers and are shown as hexadecimal number. A TAB is employed as separator among the different fields.
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Supported commands
7.2.3
Stop command
The *stop command interrupts any acquisition session that has been started either with the *start or *debug command.
7.2.4
Registers read
The *rAA command allows to read the content of the registers embedded inside the LIS3LV02DL device mounted on the evaluation kit board. In details AA, expressed as hexadecimal value and written lower-case, represents the address of the register to be read. Once the read command is issued, the board will return RAAhDDh, where AA is the address sent by the user and DD is the data present in that register. As an example, to read the CTRL_REG1 the user shall issue the command *r20 which returns, for example, R20hC7h.
7.2.5
Registers write
The *wAADD command allows to write the content of the registers embedded inside the LIS3LV02DL device mounted on the evaluation kit board. In details AA and DD, expressed as hexadecimal values and written lower-case, represent respectively the address of the register and the data to be written. As an example, to write 0xC7 inside the CTRL_REG1 the user shall issue the command *w20c7.
7.2.6
Single bit write
With this command it is possible to set/reset a single bit inside a given register. In details the command *bwAA<0:7><0|1> requires to the user to specify the address AA of register in which he/she wants to change the bit, with AA expressed as hexadecimal value and written lower-case, followed by the position of the bit to be changed, integer between 0 and 7, and the value, either 0 or 1, to be associated to the specified bit. For example, to set to 1 the FS bit present inside the CTRL_REG2 the user shall issue the command *bw2171.
7.2.7
Zon and Zoff
The Zon and Zoff commands are employed respectively to put into 3-state (i.e. highimpedance) and to exit (i.e. normal mode) the SPI lines of the ST7-USB microcontroller mounted on the evaluation kit. These commands allows to isolate the sensor mounted on the board from the microprocessor in case any external control (from a different micro mounted on a separate user board) is needed. By default, when the kit is first turned on, the SPI lines are in 3-state mode and the user is required to send the command *Zoff to allow the communication between the sensor and the micro itself.
7.2.8
Device name
The *dev command retrieves the name of the device mounted on the evaluation kit connected to the PC. For the EK3LV02DL the returned value is 3LV02DL.
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7.2.9
Firmware version
The *ver command inquiries the evaluation kit and returns the version of the FW loaded on the microprocessor mounted on it.
7.3
Quick Start
This section shows the basic sequence of commands to start a data communication session and to retrieve the acceleration data from Evaluation kit. 1. 2. 3. 4. 5. Connect the EK3LV02DL to the USB port Start the "Hyper Terminal" and configure it as described in section 7.1 Inside the "Hyper Terminal" window enter the command *Zoff to enable the control of the SPI line from the ST7-USB microcontroller Send the *debug command to get the acceleration data measured from the senor Send *stop to stop the continuos acquisition and visualization.
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8
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D1 R5 100R D3
R1 180R
J1 cs_pad sck V ddf mosi mi so Vddf 5 4 3 2 CS C5 100n SCL/ SPC 7 nc CK GND 8 D4 res R G V dd_I O SD O R2 100R R3 100R 6 1 +
da a_re dy t a
VCC
U1 LI S3LV02DL
1 V+ 2 DM 3 DP 4 GND
C1 10u
+
C4 C2 100n 4u7
USB_B
RD Y/ I NT
GND res
16 15
SD A/ SDI / SDO
Schematic diagram
V dd
res
V dd 9 10 11 12 13
oscout osci n
i ccdata i cccl k
nRESET i ccsel
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
U2 ST7265X_TQFP64 Gled Rled
R6 1k 5 osci n Yoscm1 Cosc1 33p 12MH z CS1 CS2 cs_pad Cosc2 33p oscout
Vddf
Rled Gled
Figure 25. Schematic diagram for EK3LV02DL board
C8 47n
C9
+ C10
220n PB6 PB7 PA 0 PA 1 PA 2 PA 3 PA 4 PA 5 PA 6 PA 7 SS M I SO M OSI SCK V dd1 V ss1
10u
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PWM 0 AI N6 AI N5 AI N4 AI N3 AI N2 OCM P2 OCM P1 PD3 PD2 PD1 PD0 PC7 PC6 PC5 PC4
OSCOU T OSCI N V ss2 V ssa V dda V dd2 I CCD AT A I CCCL K U SBEN A I N1 A I N0 SD A SCL RES T E V pp/I CCSEL PWM 1
UV ss UD M UD P UV cc UV dd Vddf Vssf PE5 PE6 PE7 PB0 PB1 PB2 PB3 PB4 PB5
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
VCC
17 18 19 20 21 22 23 da a_re dy 24 t a 25 26 27 28 29 30 31 32
V ddf mi so mosi sck
C3 4u7
+
C6 100n
J2 iccdata icccl k nRESET iccsel VCC 1 3 5 7 9 I CP TP1 2 4 6 8 10 Riccsel1 10k SW1 NReset C7 100n
SW2
SW3 7 6 5 4 3 2 1
The schematic diagram of the EK3LV02DL evaluation kit is shown in Figure 25.
Schematic diagram
J3 SPI
CS2 CS1 sck mi so mosi da a_re dy t a cs_pad
R7 10K
R8 10K
14
GND
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Bill Of Material
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9
Bill Of Material
The Bill of Material for the EK3LV02DL evaluation kit is given in Table 2. Table 2. Bill Of Material
Description Comment 10u 4u7 4u7 Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor 100n 100n 100n 100n 47n 220n 10u Capacitor Capacitor 33p 33p SMD_LED red SMD_LED green Footprint C1206_POL C1206_POL C1206_POL 0805 0805 0805 0805 0805 0805 C1206_POL 0805 0805 SMD_LED SMD_LED SMD_LED_3C USB_B ICP Header, 7-Pin SPI 180R 100R 100R 100R 1k5 10K 10K 10k NReset SMT_Button SMT_Button LIS3LV02DL ST72F651AR6T1E Crystal 12MHz USB_B HEADER_5X2_A HDR1X7 0805 0805 0805 0805 0805 0805 0805 0805 SMT_Button SMT_Button SMT_Button TLGA_4.4x7.5x1_16L TQFP64_10x10 OSC_SMD
Designator C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 Cosc1 Cosc2 D1 D3 D4 J1 J2 J3 R1 R2 R3 R5 R6 R7 R8 Riccsel1 SW1 SW2 SW3 U1 U2 Yoscm1
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Revision history
10
Revision history
Table 3.
Date 13-Sep-2006
Document revision history
Revision 1 Initial release. Changes
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