UM0609
User manual
STEVAL-MKI022V1
demonstration kit for LIS331DLH
Introduction
The STEVAL-MKI022V1 is a demonstration kit designed to provide the user with a
complete, ready-to-use platform for demonstration of the LIS331DLH. The LIS331DLH is a
low-power 3-axis linear accelerometer with digital output. The device includes a sensing
element and an IC interface capable of translating information from the sensing element into
a measured signal that can be used for external applications.
In addition to the MEMS sensor, the demonstration board utilizes an ST7-USB
microcontroller which functions as a bridge between the sensor and the PC, on which it is
possible to use the graphical user interface downloadable to the website or dedicated
software routines for customized applications.
This user manual describes the hardware included with the demonstration kit and provides
the information required to install and run the demonstration kit user interface.
For details regarding the features of the LIS331DLH sensor, please refer to the datasheet for
this device and application note AN2847.
March 2009
Rev 1
1/40
www.st.com
Contents
UM0609
Contents
1
Demonstration kit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
STEVAL-MKI022V1 GUI installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
2.1
PC system requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3
Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Graphical user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Connecting to the virtual COM port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2
“Easy Start” button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3
“Options” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4
“Register Setup” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5
“Bars” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.6
“Plot” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.7
“Data” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.8
“Inclinometer” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.9
“Map Browsing” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.10
“FFT” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.11
“Interrupt” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.12
“6 Direction” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.13
“Portrait/landscape” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4
Data acquisition quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5
EK lite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6
MEMS pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1
7
6.1.1
Left side: main control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1.2
Right side: pointer application controls . . . . . . . . . . . . . . . . . . . . . . . . . 28
Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1
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GUI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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Contents
7.2
7.3
8
Supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2.1
Start command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2.2
Debug command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2.3
Stop command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2.4
Register read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.2.5
Register write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.6
Single bit write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.7
Zon and Zoff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.8
Device name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.9
Firmware version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
DFU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.1
PC requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.2
DFU procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10
Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
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List of figures
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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.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
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Demonstration board block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Top silk screen of the STEVAL-MKI022V1 kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Board photograph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Notify icon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Driver installation using the device manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
USB driver installation using the hardware update wizard . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Virtual COM driver port assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Graphical user interface: main window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Options tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Register setup tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Bars tab - acceleration data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bars tab - selected acceleration as a numerical value . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Plot tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Plot tab - zoom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Data tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Inclinometer tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Axis inclination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Map browsing tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
FFT tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Interrupt tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6D direction tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Portrait/landscape tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STEVAL-MKI022V1 lite GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
MEMS pointer demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Demonstration kit correctly recognized. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Select new firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Flash erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Flash upgrading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Schematic diagram of the STEVAL-MKI022V1 board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
UM0609
1
Demonstration kit description
Demonstration kit description
The STEVAL-MKI022V1 is a complete demonstration kit that allows demonstrating the
performance of the LIS331DLH low-power 3-axis linear accelerometer with digital output.
The block diagram of the demonstration kit is shown in Figure 1.
Figure 1.
Demonstration board block diagram
Control switches
(left, right and reset)
MEM S
senso r
D.F.U.
SPI
USB
ST72F651
µC
USB
connector
Power on LED
Data ready LED
General purpose LED
AM01765v1
The ST7-USB microcontroller included on the board allows communication between the
sensor device and the PC. The user can interact with the hardware either through the GUI
provided with the kit or through dedicated software routines to run customized applications.
The device firmware upgrade (DFU) is a feature that allows the customer to upgrade the
firmware inside the ST7 microcontroller in case a new firmware relase is available on
www.st.com/mems.
Switches and LED indicators are used to control and monitor the functionality of the board.
The top silk screen view and photo of the full board, respectively, are shown in Figure 2 and
Figure 3.
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Demonstration kit description
Figure 2.
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Top silk screen of the STEVAL-MKI022V1 kit
AM01766v1
Figure 3.
Board photograph
AM01767v1
Operation of the STEVAL-MKI022V1 demonstration kit requires the installation of a
dedicated driver which is included in the installation pack, together with a GUI interface
which allows simple interaction with the sensor. The steps required for driver and software
installation are described in the following section.
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2
STEVAL-MKI022V1 GUI installation
STEVAL-MKI022V1 GUI installation
The installation of the graphical user interface (GUI) for the STEVAL-MKI022V1 requires two
steps:
2.1
1.
installation of the software downloaded from www.st.com/mems
2.
installation of the virtual COM driver needed to use the demonstration kit.
PC system requirements
Both the hardware and software that compose the STEVAL-MKI022V1 demonstration kit
have been designed to operate with Microsoft® Windows XP.
2.2
Software installation
To install the software downloaded from demonstration kit web page:
1.
double-click on “Setup.exe”
2.
follow the on-screen instructions (Figure 4).
Figure 4.
Software installation
AM01768v1
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STEVAL-MKI022V1 GUI installation
2.3
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Hardware installation
To install the virtual COM driver, insert the demonstration kit board into a free USB port. The
“Notify” icon should appear as in Figure 5.
Figure 5.
Notify icon
AM01769v1
If the “Hardware Update Wizard” window appears (Figure 7), follow the instructions on the
screen, otherwise, the installation can be performed by following the instructions indicated in
Figure 6 and then Figure 7.
Figure 6.
Driver installation using the device manager
Right click on My Computer
Right click on “ST MEMS UNIT” and choose update driver
AM01770v1
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STEVAL-MKI022V1 GUI installation
Figure 7.
USB driver installation using the hardware update wizard
3
4
6
5
7
AM01771v1
Once the installation is complete, a COM port number is assigned to the ST virtual COM
driver (Figure 8). This number should be retained as it is required to run the STEVALMKI022V1 demonstration software GUI. For additional details, see section 3.1.
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STEVAL-MKI022V1 GUI installation
Figure 8.
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Virtual COM driver port assignment
AM01772v1
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3
Graphical user interface
Graphical user interface
To execute the STEVAL-MKI022V1 demonstration software GUI:
1.
click on Start > All Programs
2.
select STEVAL-MKI022V1 > Executables
3.
launch the program “STEVAL-MKI022V1 Ver.1.0”.
The GUI main window appears as shown in Figure 9.
Figure 9.
Graphical user interface: main window
ref 3
ref 2
ref 1
ref 5
ref 4
AM01773v1
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Graphical user interface
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The functions of the four main sections of the window are described below:
3.1
1.
“Main Control” (Figure 9 , ref 1) - connects/disconnects the board and starts acquisition
via the Start/Stop buttons
2.
“Saving” box (Figure 9, ref 2) - allows the user to save the data to a specified text file,
choosing the data type to write. Data types availabe are:
a)
RAW: for each axis the software writes the data read directly from the sensor
output registers (OUTX_H, OUTX_L, OUTY_H, OUTY_L and OUTZ_H, OUTZ_L)
b)
LSB: the data read directly from the sensor are converted from 2’s complement to
sign and magnitude
c)
Acceleration: LSB data are multiplied by the sensitivity to obtain the acceleration
expressed in mg
d)
Angle: LSB data converted to the tilting angle of the board expressed in degrees
e)
Inturrupt: status of the interrupt
3.
“Tab Selector” (Figure 9, ref 3) - used to toggle between the different functions of the
demonstration kit
4.
“Legend” (Figure 9, ref 4) - possiblity to enable/disable viewing the axes
5.
“Details” (Figure 9, ref 5) - shows the details of the demonstration kit, the name of the
sensor, the version of the firmware loaded on the microcontroller and the version of the
PC software.
Connecting to the virtual COM port
Before using the functions of the demonstration kit software the connection with the
STEVAL-MKI022V1 board must be opened using the following steps:
1.
connect the STEVAL-MKI022V1 to the desired USB port
2.
in the “Select COM” drop-down menu (Figure 9 ref 1), choose the virtual COM number
to which the board has been mapped. For additional information on how to obtain this
number, see section 2.3
3.
open the connection by clicking on “Connect” (Figure 9 ref 1)
At this point the user can acquire, plot and save the acceleration data measured by the
sensor and access the content of the registers embedded in the device.
Clicking the "Find" button (Figure 9 ref 1), the GUI attempts to automatically find the COM
number assigned to the demonstration kit and shows it in the list box as a selected item.
The following sections provide details regarding the functions of the tabs in Figure 9, ref 1.
3.2
“Easy Start” button
Clicking the "Easy Start" button (Figure 9, ref 1), the GUI attempts to automatically find the
COM number assigned to the demonstration kit and starts the acquisition.
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3.3
Graphical user interface
“Options” tab
The options tab allows the user to control the following parameters:
1.
Full scale (FS) - Sets the maximum acceleration value measurable by the device. It is
possible to select either 2g, 4g or 8g (Figure 10, ref 1)
2.
Operating mode (OM) - This control allows the customer to select the operating mode:
normal mode, power-down mode and different low-power modes (0.5, 1, 2, 5 or 10 Hz)
(Figure 10, ref 2)
3.
Block data update (BDU) - BDU function is used to inhibit the output registers update
between the reading of upper and lower register parts. After the reading of the lower
(upper) part, the content of that output register is not updated until the upper (lower)
part is read too (Figure 10, ref 3)
4.
High-pass filter (HP) - This control activates the high-pass filter on the device and
selects the cut-off frequency (Figure 10, ref 4)
5.
Data rate (DR) - In this box the rate at which each acceleration sample is produced can
be selected. The possible values are 50, 100, 400 or 1000 Hz (Figure 10, ref 5)
6.
Tri-state (TS) - Permits switching the SPI lines of the ST7-USB microcontroller mounted
on the demonstration kit between 3-state (i.e. high-impedance) and normal mode
(Figure 10, ref 6). This function makes it possible to isolate the sensor mounted on the
board from the microprocessor, in case any external control (from a different
microcontroller mounted on a separate user board) is needed. This function is inhibited
during the acquisition
7.
Big/little endian (BLE) - It is used to select big endian or little endian representation for
output registers. In big endian representation one MSB acceleration value is located at
addresses 28h (X-axis), 2Ah (Y-axis) and 2Ch (Z-axis) while the LSB acceleration value
is located at addresses 29h (X-axis), 2Bh (Y-axis) and 2Dh (Z-axis). In little endian
representation the order is inverted (Figure 10, ref 7)
8.
Sleep to Wake (StW) - This feature allows the user to configure the automatic wakeup
feature of the LIS331DLH. When the Sleep to Wake function is activated, the
LIS331DLH is able to automatically wake up as soon as the configured interrupt event
has been detected, increasing the output data rate and bandwidth. With this feature the
system can be efficiently switched from low-power mode to full performance,
depending on user-selectable positioning and acceleration events, thus ensuring power
saving and flexibility. With the “Set Function” button the software automatically
configures the sensor to use the Sleep to Wake with a wakeup interrupt mode
(Figure 10, ref 8)
9.
Current consumption - It shows the typical current consumption for each operating
mode/data rate configuration (Figure 10, ref 9).
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Graphical user interface
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Figure 10. Options tab
ref 1
ref 5
ref 2
ref 6
ref 3
ref 7
ref 8
ref 4
ref 9
AM01774v1
3.4
“Register Setup” tab
The register setup tab shown in Figure 11 allows read/write access to the content of the
registers embedded in the LIS331DLH MEMS sensor mounted on the demonstration kit.
The tab is divided into five sections:
Note:
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1.
“General” (Figure 11, ref 1) - provides access to the registers which control the main
settings of the device. This section contains the control registers (CTRL_REG1,
CTRL_REG2 and CTRL_REG3) and the registers that control the generation of inertial
interrupt signals. It is possible to read and write the contents of each register. To restore
the default value for a given register, press the “Default” button
2.
“All Registers” (Figure 11, ref 2) - permits the user to read, write and recall the default
content for all the registers shown in ref 1 with a single click on the read/write/default
button
3.
“Registers Direct Access” (Figure 11, ref 3) - provides access to any register in the
device. To read a generic register, insert the address in the “Register Address” textbox,
then click on the “Read” button. The retrieved content of the register is displayed in the
“Register Value” field. As with writing to a register, the user must specify the address
and the data to be written inside the fields marked “Register Address” and “Register
Value”, respectively, and then press the “Write” button
4.
“Parameters” (Figure 11, ref 4) - allows the user to save the register configuration to a
text file, which includes a detailed description of the resulting configuration for each
register
5.
“Load/save configuration” (Figure 11, ref 5) - lets the user save/load a specific
configuration to/from a file
By pressing the "Default" button, the default values for the registers are recalled in the
registers field. To write the values to the registers of the device, the user has to press the
"Write" button after the "Default" button.
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Graphical user interface
Figure 11. Register setup tab
ref 1
ref 2
ref 3
ref 5
ref 4
AM01775v1
3.5
“Bars” tab
The bars tab (Figure 12) displays the acceleration data measured by the LIS331DLH sensor
in bar chart format. The accelerations along the X, Y and Z axes correspond respectively to
the red, green and blue bars.
The height of each bar is determined by the amplitude of the acceleration signal measured
along the related axis. The full scale of the graph depends on the FS1/FS0 bits of
CTRL_REG4 that may be changed through both the Option (Figure 10, ref 1) and the
Register Setup tabs (Figure 11, ref 1).
Click on the desired bar to zoom. The selected bar is shown at the center of the screen
together with the acceleration as a numerical value. To return to the default view, click on the
center of the bar (Figure 13).
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Graphical user interface
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Figure 12. Bars tab - acceleration data
AM01776v1
Figure 13. Bars tab - selected acceleration as a numerical value
AM01777v1
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3.6
Graphical user interface
“Plot” tab
The plot tab (Figure 14) shows the sequence of acceleration samples that have been
measured by the LIS331DLH MEMS sensor mounted on the demonstration kit. This tab
shows:
1.
“Acceleration value” (Figure 14, ref 1) - shows the numeric values of acceleration
samples that have been measured by the sensor
2.
“Information” (Figure 14, ref 2) - legend of the current status which gives the operating
mode, the data rate and the full scale
To zoom in on the waveform, select the desired zone with the left button of the mouse
(Figure 15). Click again with the right button to return to the default view.
Figure 14. Plot tab
ref 1
ref 2
AM01778v1
17/40
Graphical user interface
UM0609
Figure 15. Plot tab - zoom
1) Select one point on the screen
and click the LEFT mouse button
2) Holding the LEFT mouse button
clicked, move the cursor to obtain
an area on the screen
3) Releasing the button to terminate
the Zoom in process, a new area
is visualized on the screen
4) To return to the previous view
the user has to click the RIGHT
mouse button
AM01779v1
18/40
UM0609
3.7
Graphical user interface
“Data” tab
The data tab (Figure 16) shows the acceleration values measured by the LIS331DLH
sensor. It is divided into three sections:
Note:
1.
“ADC Out” (Figure 16, ref 1) - displays the acceleration data provided by the sensor
after its conversion from 2’s complement to magnitude and sign
2.
“Acceleration Value” (Figure 16, ref 2) - represents the acceleration data measured by
the sensor, expressed in mg
3.
“Angle” (Figure 16, ref 3) - returns the tilt angle, expressed in degrees, that is inferred
from the “ADC Out” data
To increase data readability, the values shown in the boxes described above are based on
an average of 50 samples.
Figure 16. Data tab
ref 1
ref 2
ref 3
AM01780v1
19/40
Graphical user interface
3.8
UM0609
“Inclinometer” tab
The inclinometer tab (Figure 17) represents the acceleration data measured by the sensor
in the form of an artificial horizon.
Figure 17. Inclinometer tab
AM01781v1
Figure 18. Axis inclination
+90°
0°
horizontal plane
x,y, z
-90°
3.9
AM01782v1
“Map Browsing” tab
The map browsing tab demonstrates the possibility of using the acceleration data obtained
from the sensor to scroll a map (or another type of document) on the screen.
20/40
UM0609
Graphical user interface
Figure 19. Map browsing tab
a)
b)
AM01783v1
To move the map on the screen, the user must tilt the demonstration kit.
Figure 19, (a) illustrates:
1.
a tilt along the X-axis (roll) causes the map to move in a left/right direction on the
screen
2.
a tilt along the Y-axis (pitch) causes the map to move in a top/bottom direction on the
screen
Figure 19 (b) shows an example. The board is tilted along the X-axis (positive roll) and the
map on the screen is moved to the right.
21/40
Graphical user interface
3.10
UM0609
“FFT” tab
The FFT tab (Figure 20) shows the FFT of the acceleration signals acquired by the sensor.
The spectral data are updated every sample and are calculated on a 64-sample moving
window.
Figure 20. FFT tab
AM01784v1
3.11
“Interrupt” tab
The interrupt tab (Figure 21) provides a tool for evaluating the interrupt generation features
of the LIS331DLH MEMS sensor. In this section of the GUI it is possible to configure the
characteristics of the inertial events that must be recognized by the device and to visualize,
in real-time, the level of the two interrupt lines together with the acceleration signals that are
measured by the device.
The GUI provides direct access to the registers (INT_CFG, INT_SRC, THS and duration)
that allow the configuration (Figure 21, ref 1) of the two independent interrupt sources of the
device. Conversion boxes are located on the right-most side of the THS and DURATION
registers (Figure 21, ref 2). These boxes are intended to show, respectively, the threshold
value expressed in mg and the duration value converted in msec for better readability and
understanding.
Finally, two buttons are provided for each interrupt line to set the suggested default values
for free-fall and wakeup detection. Those buttons are marked “Set FreeFall Default” and “Set
Wake Up Default”, respectively (Figure 21, ref 3).
22/40
UM0609
Graphical user interface
Figure 21. Interrupt tab
ref 1
3.12
ref 2
ref 3
AM01785v1
“6 Direction” tab
The 6 direction tab (Figure 22) gives an example of usage of the “6D Position” function
available on the LIS331DLH.
In this tab it is possible to configure the interrupt with the related registers (INTx_CFG,
INTx_THS, INTx_DURATION) (Figure 22, ref 1) and visualize in real time the status of
INTx_SRC (Figure 22, ref 2). In our example INT1 has been configured.
Referring to Figure 22, the teapot (ref 3) changes its orientation according to INT1_SRC
content.
The grey arrows around the board turn from grey to red according to the orientation of the
board with respect to gravity (Figure 22, ref 4).
If no position has been recognized, INTx_SRC is equal to 0x00h and the message
“Undefined Position” appears.
23/40
Graphical user interface
UM0609
Figure 22. 6D direction tab
ref 3
ref 4
3.13
ref 1
ref 2
AM01786v1
“Portrait/landscape” tab
This tab shows an example of the portrait/landscape function. The image shown on the
screen of the mobile phone (Figure 23) is always horizontal regardless of the orientation of
the device.
Figure 23. Portrait/landscape tab
Earth
AM01787v1
24/40
UM0609
4
Data acquisition quick start
Data acquisition quick start
This section describes the basic steps that must be performed to acquire the acceleration
data from the STEVAL-MKI022V1:
1.
connect the STEVAL-MKI022V1 to the USB port
2.
start the STEVAL-MKI022V1 GUI
3.
select the Virtual COM port and click on the “Connect” button (Figure 9, ref 1)
4.
select the destination file to which the acceleration data must be saved by clicking
“Save” (Figure 9, ref 2) in the main control section (optional)
5.
use the tab menu to display the desired function
6.
click on the “START” (or ”STOP”) button to activate (or stop) the sensor data collection,
saving to file, and screen plotting functions
7.
to close the application, click on “Disconnect” and then click on “Exit”.
25/40
EK lite
5
UM0609
EK lite
A lite version of the previous GUI together with its source code is also included in the
installation pack. The source code can be found in the directory: ($Home)\STM\STEVALMKI022V1\STEVAL-MKI022V1_lite, where ($Home) is the directory in which the software
that came with the demonstration kit was installed (C:\Program Files by default).
The purpose of the lite version is to provide the user with a base for the development of a
customized application.
The lite version of the demonstration kit is started by launching the STEVAL-MKI022V1 lite
executable file located in the STEVAL-MKI022V1 > Executables folder.
An example of the GUI of the EK lite application is shown in Figure 24.
Figure 24. STEVAL-MKI022V1 lite GUI
AM01788v1
Follow these instructions to use the software:
1.
connect the STEVAL-MKI022V1 to the USB port
2.
launch the GUI for STEVAL-MKI022V1 lite
3.
select the virtual COM port and click on the “Connect” button
4.
select the destination file to which the acceleration data must be saved (optional)
5.
click on the “START” (or ”STOP”) button to activate (or stop) the sensor data collection,
saving to file, and screen plotting functions
6.
to close the application, click on “Disconnect” and then click on “Exit”.
The GUI also gives read/write access to the registers embedded in the LIS331DLH device
and allows a single read of the acceleration data measured by the sensor.
26/40
UM0609
6
MEMS pointer
MEMS pointer
This section describes how to use a simple pointer application which utilizes acceleration
data provided by the LIS331DLH MEMS 3-axis linear accelerometer to control the position
of a pointer on the screen of the PC. The software provided with the kit allows the
STEVAL-MKI022V1 demonstration kit to be used as an inertial mouse, where the tilt of the
board is translated into movement of the pointer. The board also emulates the left and right
buttons of the mouse.
6.1
GUI description
The GUI window (see Figure 25) is divided into two sections. The left section contains the
main controls to open the connection to the demonstration kit and to start/stop the data
acquisition (ref 1). The bottom section contains the demonstration kit details (device and
firmware, ref 2).
The right section shows the same data and the mouse speed control.
Figure 25. MEMS pointer demonstration
ref 3
ref 1
ref 4
ref 5
ref 6
ref 2
AM01789v1
6.1.1
Left side: main control
The buttons on the left side of the GUI and their related functions are described below:
1.
Connect/disconnect control - selects the COM port to which the EK board is connected
2.
Acquisition control - starts and stops acquisition
3.
Exit - exits the MEMS pointer demonstration application.
27/40
MEMS pointer
6.1.2
UM0609
Right side: pointer application controls
The controls on the right side of the GUI and their related functions are as follows:
28/40
1.
Left button/right button - indicates when the left/right button on the demonstration kit is
pressed (ref 3)
2.
X/Y-position - shows the current x/y coordinates of the mouse pointer on the PC screen
(ref 4)
3.
X/Y-deg - shows the tilt of the demonstration kit along the X and Y axes (ref 5)
4.
Pointer speed - sets the sensitivity of the pointer to the inclination of the board (ref 6).
UM0609
7
Supported commands
Supported commands
The microcontroller mounted on the STEVAL-MKI022V1 board is equipped with dedicated
firmware which supports a set of commands that allow the control of the 3-axis digital output
MEMS sensor and permit the acquisition of the measured acceleration data. The firmware
also handles the communication between the EK board and the PC through the USB bus.
These features allow users to easily write their own applications to exploit the capabilities of
the accelerometer.
This section describes the commands that are supported by the firmware for the
microcontroller of the STEVAL-MKI022V1 demonstration kit.
7.1
Getting started
Before using the commands supported by the firmware, the following procedure must be
performed:
1.
connect the STEVAL-MKI022V1 to the USB port
2.
launch an application which allows the sending of commands through the Virtual serial
port. The remainder of this document assumes the use of the Microsoft© Hyper
Terminal program integrated in the Windows XP operating system
3.
create a new connection, enter a name (ex. “STEVAL-MKI022V1”), and click “OK”
4.
in the “Connect Using” field, select the Virtual COM port to which the USB port has
been mapped, and click “OK”
5.
in port settings, set bits per second to 115200, data bits to 8, parity to none, stop bits to
1, and flow control to none. Click “OK”
6.
in the hyper terminal select files > properties > settings and then click on the “ASCII
Setup” button
7.
select “Send line ends with line feeds” and “Echo typed characters locally”
8.
click the “OK” button to close the “ASCII Setup” window
9.
click the “OK” button to close the “Properties” window.
Once this procedure has been completed the user can utilize the commands described in
the following sections by typing them into the “hyper terminal” window.
7.2
Supported commands
The table below lists the commands supported by the STEVAL-MKI022V1 firmware:
Table 1.
Supported commands
Command
Description
Returned value
*start
Starts continuous data acquisition
s t xh xl yh yl zh zl I1 I2 s
*debug
Returns the acceleration data in readable
text format
x=XX y=YY z=ZZ
*stop
Stops data acquisition
*rAA
Register read
RAAhDDh
29/40
Supported commands
Table 1.
Note:
UM0609
Supported commands (continued)
Command
Description
Returned value
*wAADD
Register write
*bwAA
Single bit write
*Zon
Force 3-state
*Zoff
Exit from 3-state
*dev
Device name
LIS331DLH
*ver
Firmware version
331DLH 1.0
AA: register address
DD: data
S: service field
Xh and Xl, Yh and Yl, Zh and Zl: Acceleration data returned for the X, Y and Z axes
I1, I2 : interrupt value on each axis.
7.2.1
Start command
The *start command initiates the continuous data acquisition. When this command is sent to
the board, it returns the acceleration data measured by the LIS331DLH device. The
acceleration data are packed in a string composed of eight bytes: “s t xh xl yh yl zh zl I1 I2 s”.
The first two bytes are always “s” and “t” which correspond to the hexadecimal values {73
74}, while “X” “Y” “Z” represent, respectively, the acceleration data for the X, Y, Z axes.
“I1” and “I2” contain the values of INT1_SRC and INT2_SRC, where each bit is a specific
interrupt.
The last byte “s” returns information about the switches mounted on the board. Specifically,
bit#1 and bit#0 of the "service data" correspond to the status of SW3 and SW2 on the
demonstration kit board, and they are set to 1 when the corresponding switch is pressed.
7.2.2
Debug command
The debug command starts the continuous data acquisition in debug mode. When this
command is sent to the board, it returns the acceleration data measured by the LIS331DLH
device in readable text format. The values shown on the screen correspond to the content of
the output data registers and are shown as a decimal number. A tab is employed as a
separator between the different fields.
7.2.3
Stop command
The *stop command interrupts any acquisition session that has been started with either the
*start or *debug commands.
7.2.4
Register read
The *rAA command allows the contents of the LIS331DLH device registers in the
demonstration kit board to be read. AA, expressed as hexadecimal value and written uppercase, represents the address of the register to be read.
30/40
UM0609
Supported commands
Once the read command is issued, the board returns RAAhDDh, where AA is the address
sent by the user and DD is the data present in the register.
For example, to read the CTRL_REG1 the user would issue the command *r20, which
returns R20hC7h.
7.2.5
Register write
The *wAADD command permits writing to the contents of the LIS331DLH device registers in
the demonstration kit board. AA and DD, expressed as hexadecimal values and written
upper-case, represent respectively the address of the register and the data to be written. To
write 0xC7 to the CTRL_REG1, for example, the user would issue the command *w20C7.
7.2.6
Single bit write
Using this command it is possible to set/reset a single bit in a given register. The command
*bwAA requires the user to specify the address AA of the register in which to
change the bit, with AA expressed as a hexadecimal value and written in lower-case,
followed by the position of the bit to be changed, an integer between 0 and 7, and the value,
either 0 or 1, to be associated to the specified bit.
For example, to set the FS bit to 1 within the CTRL_REG2, the user would 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 demonstration kit. These commands allow the isolation of the sensor from
the microprocessor in the event that an external control (from a different microcontroller
mounted on a separate 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 communication between the sensor and the
microcontroller.
7.2.8
Device name
The *dev command retrieves the name of the device mounted on the demonstration kit
connected to the PC. For the STEVAL-MKI022V1, the returned value is “LIS331DLH”.
7.2.9
Firmware version
The *ver command queries the demonstration kit and returns the version of the firmware
loaded in the microprocessor.
31/40
Supported commands
7.3
UM0609
Quick start
This section shows the basic sequence of commands to start a data communication session
and to retrieve the acceleration data from the demonstration kit:
32/40
1.
connect the STEVAL-MKI022V1 to the USB port
2.
start “Microsoft© Hyper Terminal” and configure it as described in Section 7.1
3.
inside the “Hyper Terminal” window, enter the command *Zoff to enable the control of
the SPI line from the ST7-USB microcontroller
4.
send the *debug command to get the acceleration data measured by the sensor
5.
send *stop to end the continuous acquisition and visualization.
UM0609
8
DFU
DFU
The MEMS device firmware update GUI is a graphical interface that allows the user to
download and replace the firmware of a MEMS product division demonstration board
directly from a PC through the USB port.
The MEMS demonstration boards that mount an ST7-USB microcontroller have the
capability of reprogramming an application through the USB, in accordance with the DFU
class specification defined by the USB Implementers Forum. This capability is useful
because it allows reprogramming the microcontroller directly in the field and is particularly
well-suited in the USB applications where the same USB connector can be used both for the
standard operating mode and for the reprogramming process.
Connector J4 must be shorted to allow the DFU procedure. If the demonstration kit is going
to be reprogrammed through the ICP connector and the ST7 dedicated tools, J4 must be
open.
8.1
PC requirements
In order to use the device firmware upgrade (DFU) software with the Windows operating
system, a recent version of Windows, such as Windows 98, Windows 98SE, Windows
Millennium, Windows 2000 or Windows XP must be installed on the PC.
8.2
DFU procedure
Run the DFU.exe file. To enter the firmware update mode the user must plug in the USB
cable to the demonstration kit while pressing Button 2 (Figure 26).
Figure 26. Demonstration kit correctly recognized
AM01790v1
The DFU driver must be installed before using this feature. The driver can be found in
“firmwareupdate.zip” in the driver installation folder of the demonstration kit.
After installation, “MEMS demonstration DFU” appears in the DFU USB devices list
(Figure 26).
33/40
DFU
UM0609
To execute the firmware upgrade:
6.
click on File > Open, then select the correct directory where the “.dfu” file has been
downloaded and select it (Figure 27)
7.
click on “Upgrade”
8.
the internal flash memory erased (Figure 28)
9.
and reflashed with the new firmware (Figure 29).
Once the procedure is finished, a windows message appears, stating that a USB device is
not recognized. You can then unplug the USB cable from the EK demonstration board and
use it with the new firmware.
In order to back up your actual firmware before flashing the demonstration kit with a new
one, flag “Upload DFU device” (Figure 26) before clicking on “Upgrade”. You will be
prompted to save the current firmware in your preferred directory before the erasing of the
internal flash.
Figure 27. Select new firmware
AM01791v1
Figure 28. Flash erasing
AM01792v1
34/40
UM0609
DFU
Figure 29. Flash upgrading
AM01793v1
35/40
D
C
B
1
V+
2
DM
3
DP
4
nc
5
GND
USB_mini_B
J1
D1
1
C8
47nF
R6
1.5K
R1
180R
C9
220nF
VCC
2
R7
10K
C2
C4
100nF 4.7uF +
1
2
3
4
5
Vddf
6
7
8
Rled
Gled
9
DFU_SEL 10
11
CS1
12
C10
+ 10uF
13
14
15
16
C1
10uF +
C5
100nF
3
64 oscout
63 oscin
62
61
60
59
58 ic cdata
57 ic cclk
56
55
54
53
52
51 nR ESET
50 ic csel
49
UVss
UDM
UDP
UVcc
UVdd
Vddf
Vssf
PE5
PE6
PE7
PB0
PB1
PB2
PB3
PB4
PB5
SW2
SW3
R11
10K
3
C3
4.7uF
PWM0
AIN6
AIN5
AIN4
AIN3
AIN2
OCMP2
OCMP1
PD3
PD2
PD1
PD0
PC7
PC6
PC5
PC4
OSCOUT
OSCIN
Vss2
Vssa
Vdda
Vdd2
ICCDATA
ICCCLK
USBEN
AIN1
AIN0
SDA
SCL
RESET
Vpp/ICCSEL
PWM1
PB6
PB7
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
SS
MISO
MOSI
SCK
Vdd1
Vss1
17
18
19
20
cs_pad 21
22
PD
ST
23
INT1 24
INT2 25
26
Vddf 27
miso 28
mosi 29
sck
30
31
32
+
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
VCC
C6
100nF
U2
ST7265X_TQFP64
Cosc1
33pF
oscin
Gled
D2
sck
Vddf
1
2
3
4
5
12MHz
Yoscm
Rled
R2
100R
4
J3
SPI
4
Cosc2
33pF
oscout
R3
100R
GND
GND
Int1
Reserved
Int2
SDA
SDO
CS
mosi 6
miso 7
cs_pad 8
Vdd_IO
NC
NC
SCL
GND
16
15
14
GND
Reserved
VDD
TP1
VCC
R12
0R
13
12
11 INT1
10
9
U1
Motion Sensor
5
ICP
1
3
5
7
9
R13
0R
C11
100nF
J2
5
2
4
6
8
10
INT2
R10
100R
iccdata
iccclk
nRESET
iccsel
R9
100R
+ C13
10uF
D3
Riccsel
10K
DFU_SEL
D4
SW1
NReset
6
R8
1K
VCC
2
R5
470R
C7
100nF
1
3
C15
+
2
1
4
220nF 3
220nF
C18
2.2uF
C14
Q2
SO642
Q1
2STR2215
Vddf
J5
Current_Measure
R4
10K
Vdd_dut
6
1
2
A
2
CS1
cs_pad
sck
miso
mosi
INT1
INT2
7
6
5
4
3
2
1
2
G
36/40
3
LE25
1
2
3
4
7
ST662ABD
C2+
C2-
C1+
C1-
U3
1
2
3
4
U4
7
8
7
6
5
8
5
6
7
C16
4.7uF 16V
VCC
VOUT
GND
SHDN
8
7
6
5
+
+
2
C19
100nF
C12
100nF
VCC
C17
4.7uF 16V
J4
TP2
8
1
8
iccsel
D
C
B
A
9
1
R
1
Schematic diagram
UM0609
Schematic diagram
The schematic diagram of the STEVAL-MKI022V1 demonstration kit is shown in Figure 30.
Figure 30. Schematic diagram of the STEVAL-MKI022V1 board
AM01794v1
UM0609
10
Bill of materials
Bill of materials
The bill of materials for the STEVAL-MKI022V1 demonstration kit is provided in Table 2.
Table 2.
Bill of materials
Designator
Description
Comment
Footprint
C1
Capacitor
10 µF
C1206 POL
C2
Capacitor
4.7 µF
C1206 POL
C3
Capacitor
47 µF
C1206 POL
C4
Capacitor
100 nF
0805
C5
Capacitor
100 nF
0805
C6
Capacitor
100 nF
0805
C7
Capacitor
100 nF
0805
C8
Capacitor
47 nF
0805
C9
Capacitor
220 nF
0805
C10
Capacitor
10 µF
C1206 POL
C11
Capacitor
100 nF
0805
C12
Capacitor
100 nF
0805
C13
Capacitor
10 µF
C1206 POL
C14
Capacitor
220 nF
0805
C15
Capacitor
220 nF
0805
C16
Capacitor
4.7 µC 16 V
C1206 POL
C17
Capacitor
4.7 µC 16 V
C1206 POL
C18
Capacitor
2.2 µC
C1206 POL
C19
Capacitor
100 nF
0805
Cosc1
Capacitor
33 pF
0805
Cosc2
Capacitor
33 pF
0805
D1
LED
SMD LED green
SMD LED
D2
LED
SMD LED 3C
SMD LED 3C
D3
LED
SMD LED green
SMD LED
D4
LED
SMD LED red
SMD LED
J1
USB connector
USB B mini
USB B mini
J2
Header, 5X2
ICP
HEADER 5X2 A
J3
Header, 7-pin
SPI
HDR1X7
DFU jumper
J4
Header, 2-pin
Q1
Transistor
2STR2215
HDR1X2
Q2
Transistor
SO624
R1
Resistor
180 Ω
0805
R2
Resistor
100 Ω
0805
R3
Resistor
100 Ω
0805
R4
Resistor
10 kΩ
0805
37/40
Bill of materials
UM0609
Table 2.
Bill of materials (continued)
Designator
Description
Comment
R5
Resistor
470 Ω
0805
R6
Resistor
1k5
0805
R7
Resistor
10 kΩ
0805
R8
Resistor
1 kΩ
0805
R9
Resistor
100 Ω
0805
R10
Resistor
100 Ω
0805
R11
Resistor
10 kΩ
0805
R12
Resistor
0Ω
0805
R13
Resistor
0Ω
0805
Riccsel
Resistor
10 kΩ
0805
SW1
Button
NReset
SMT button
SW2
Button
SMT button
SMT button
SW3
Button
SMT button
SMT button
TP1
Test point
TP
TP
TP2
Test point
GND
TP
U1
LIS331DLH
TLGA 3x3x1
U2
ST72F651AR6T1E
TQFP64 10x10
U3
ST662ABD
SO-G8
U4
LE25
SO-8
12 MHz
OSC SMD
Yoscm1
38/40
Footprint
Crystal
UM0609
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Revision history
Revision history
Table 3.
Document revision history
Date
Revision
05-Mar-2009
1
Changes
Initial release
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UM0609
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