Freescale Semiconductor MCF5249 User Manual

M5249RDUG

5/2003

REV 2

MCF5249 Fingerprint Security
Reference Design User’s Guide

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MCF5249 Fingerprint Security Reference Design User’s Guide

About This Docum ent

The primary objective of this document is to provide a quick introduction to the MCF5249 Fingerprint
Biometrics Reference design.

Audience

This document is intended for users of the reference design hardware and software, that is, the M5249C3
Biometric s daughter card and th e executabl e software.

Suggested Reading

The following documents provide background for the information in this user’s guide.

• Integrating the MCF5249 to a Biometric Fingerprint Sensor (AN2382/D)

• MCF5249 ColdFire Integrated Microprocessor User’s Manual, R0.1 (MCF5249UM/D)

• M5249C3 User’s Manual, R1.1 (M5249C3UM/AD)

Requirements

This document assumes that the reader is in possession of the following:

• M5249C3 evaluation boar d (EVB) wi th dBUG version v3a.1b.1b ( Sep 26 2002) or later (Previous
versions may have problems with ethernet download. See the ColdFire website,

www.motorola.com/ColdFire

, for dBUG upgrades if required.)

• M5249C3 Biometrics Security daughter card

• RS232 cable

• Ethernet cable (crossed if not connecting through a network)

• tftp server running on the PC (available from the NetBurner website, www.netburner.com

)

• Flash progr ammer (CFF l asher.exe is available from the Motorola website,

e-www.motorola.com/collateral/CFFLASHER.htm

)

This document also assumes that the reader has read AN2382/D, Integrating the MCF5249 to a Biometric
Fingerprint Sensor, and has downloaded the demonstration biometric application containing the Acter AG
biometric algorithm from the ColdFire website.

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4 MCF5249 Fingerprint Security Reference Design User’s Guide MOTOROLA

1 Introduction

This document describ es how to set up and run t he demonstration biometric appl ication which function s a s
a simple fingerprint recognition system. It details how to download the application to the M5249C3 EVB,
how to run it, and how to interact with it.

1.1 Key Features

The MCF5249 Biometrics Security Reference Design is comprised of a daughter card designed to fit onto
the M5249C3 EVB and EVB application software. The daughter card includes a user interface in the form
of an LCD panel and a fingerprint sensor as shown in Figure 1.

NOTE

If the application has been programmed into the EVB Flash, fitting the
daughter card to the EVB and connecting the power supply causes the
application to run automatically.

Figure 1. M5249C3 Biometrics Security Daughter Card

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MOTOROLA MCF5249 Fingerprint Security Reference Design User’s Guide 5

2Setup

Carefully follow these steps to set up the biometrics fingerprint reference design for demonst ration.

2.1 Flash Version

1. Fit the Biometrics Security daughter card to the M5249C3 EVB using the expansion connectors.
The connectors are keyed and will only fit one way, with the sensor on the IDE connector side of
the EVB and the LCD on the BDM conn ector side.

2. Connect the P&E wiggler and power cables to the EVB.

3. Run CFFlasher.exe, click on Target Configuration, and select the MCF5249C3 radio button.

4. Click on Program Flash, browse for the MCF5249BIOflash.s19 S-record, and click on Program.
The S-record will be programmed starting at address 0XFFF00000.

5. Disconnect the power and P&E wiggler and switch jumper 12 from pins 1–2 to pins 2–3 on the
EVB and reconnect the power cable. Jumper 12 determines where in Flash the board will boot
from (See section 3.1.14 of the MCF5249 User’s Manual).

2.2 RAM Version

1. Fit the Biometrics Security daughter card to the M5249C3 EVB using the expansion connectors.
The connectors are keyed and will only fit one way, with the sensor on the IDE connector side of
the EVB and the LCD on the BDM conn ector side.

2. Ensure that jumper 12 is set to pins 1–2 to allow dBUG to boot.

3. Connect the RS232 cable from an available COM port on the PC to the terminal connector on the
EVB.

4. Connect the Ethernet cable to the Ethernet connector on the EVB. If a network point is not
available, it is possible to establish a direct connection to the PC with a crossed cable.

5. Set up Hyperterminal or ano ther termi nal emulation program on the PC as describe d in Sectio n 2.1
of the M5249C3 User’s Manual.

6. Set up the dBUG network parameter s as desc ribed in Appendix A of the M5249 C3 User’s Manual.
If a network point is not available and a direct connection is being used, set up the dBUG
parameters to match the settings of the PC.

7. Ensure that the 5249BIO.bin binary image file is in the directory that the tftp server is currently
monitoring.

8. Download the image file using the dBUG DN command (The image could also be downloaded
using the dBUG DL command; however, using the DL command may take a long time).

3 Running the Application

The Flash and RAM versions of the application operate identically except that the Flash version will run
immediately after the p ower is connected to the board assuming that jumper 12 is set to pin s 2–3.

To run the application after it has been downloaded, type the following command at the dBUG prompt:

dBUG> go 20000

The terminal window will dis pl ay the initialization of uCli nux a nd the fingerprint applica ti on wi ll run. The
LCD will show a startup welcome message before going into fingerprint acquisition.

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6 MCF5249 Fingerprint Security Reference Design User’s Guide MOTOROLA

At startup, the application runs a calibration routine that adjusts the finger detection sequence to ambient
sensor readings. During this routine, the LCD displays the following message, asking the user to refrain
from touching the sensor until the calibration is complete:

Sensor calibration:
Please dont touch

The application has two modes, enrollment and verificati on, s el ected via the switch on the daughter car d. If
the switch is set to verification when the application is run, verification begins and the application asks for
a finger to be place d on the se nsor. However , since thi s is the st art of t he demonstra tion, there is no templ ate
to which the fingerprint can be compared; therefore, verification will fail. Set the switch to enrollment, and
place a finger on the sensor to reset the software to enrollment mode.

3.1 Enrollment Mode

In enrollment mode, the application runs the fingerprint acquisition and algorithm between four and seven
times in order to create a template for future verification. The LCD displays the following message for each
of the runs:

Enroll: Score(0) = -­please re-place finger

If a finger is not placed on the sensor, a timeout occurs, the enrollment fails, and the LCD displays the
timeout message below. The application then returns to the start of the enrollment sequence.

Enroll: Score(1) = -­Enrollment failed!..
(timeout reache d)

Upon completion of four or more suc cessful fing erprint acquisi tions, the enr oll score shows an actual value,
as in the examp le below. This value changes based on the clarity of the image, the num ber of min utia
available for extraction, and the weight each minutia has been given according to prior matches. Though it
is possible to keep the finger on the sensor throughout the seven acquisitions, to increase template quality,
the finger should be lifted and replaced between each acquisition.

Enroll: Score(4) = 41%
enrollment SUCCESFULL!..
switch to verification

Completing seven acquisitions is more likely to produce a higher score because, with each additional
acquisition, specific minutia can gain a higher weighting.

Enroll: Score(7) = 77%
enrollment SUCCESFULL!..
switch to verification

To stop the enrollment proc ess , do not touc h the sens or unt il a ti me out has oc cur re d. The LCD will dis pla y
the final enro ll sco re and will ask for the switc h to be m oved to verif ication . If the final sc ore is less tha n
25%, then enrollment is insufficient and the process will be restarted as in the example below.

Enroll: Score(5) = 22%
enrollment failed!..
(Score < 25%)

NOTE

The demonstration will only store one fingerprint template at a time.

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MOTOROLA MCF5249 Fingerprint Security Reference Design User’s Guide 7

3.2 Verification Mode

In verifica tion mode, the user ’s fingerprint is ca ptured and comp ared against th e template crea ted during
enrollment. A fter enrollm ent ha s been c omple ted and the sw itch is s et to v erifica tion, t he LCD displa ys a
message asking for a finger to be pla ced on the sensor. If no finger i s pl ace d, a timeout occurs and the LCD
displays the same request. If a finger is pl ace d on t he sensor, the fingerprint will be captured and compared
to the templa te.

If the fingerprint matches the template, then the following mess age will be di splayed:

Congratulations!
Your fingerprint has
been verified.

If the fingerprint does not match the template, the following message will be displayed:

Sorry,
Your fingerprint has
failed verification.

The demonstration remains in verification mode until the switch is moved back to enrollment. When
enrollment is selected, the previous template is erased and a new one is created by the next successful
enrollment.

4 Additional Information

To demonstrate the versatility of the fingerprint algorithm during verification, the correct finger can be
placed on the sensor in different orientations, or it can be moved around with a fixed orientation. Also, a
comparison can be made between dry and wet fingers , result ing in different enroll scores. Expe riments like
these highlight how the correct fingerprint can be verified in a variety of conditions.

Another feature of the fingerprint algorithm can be used to alert the user to the verification of latent
fingerprint images (residual fingerprints left on the surface of the sensor). Since these images can be used
to fool the system if the sensor takes an image when no finger is present, the algorithm detects, based on
adjustable ro tational and translation thresholds, im ages that are too close or id entical to the last matched
fingerprin t. If the cap tured fingerp rint image is detected as identical to the previous matched imag e, the
LCD will display a message tha t indi cates this c ondition. Th e algor ithm ’s ability to detect latent fingerprint
images can be demonstrated during verification by leaving the finger on the sensor.

There is also a we b server running on the MCF5249 as part of the app lication t hat displ ays the images tak en
from the sensor. There is one page that shows the seven images taken as part of the enrollment mode, and
another page that shows the last image taken by the sensor.

To demonstrate the web server, connect a crossed Ethernet cable directly to the PC, and switch the proxy
server off in Internet Explorer (Tools/Internet Options/Connections/LAN settings) before opening the
webpage http://10.0.0.10 via the address bar.

To return to booting with dBUG after using the Flash version, switch jumper 12 back to pins 1–2.

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8 MCF5249 Fingerprint Security Reference Design User’s Guide MOTOROLA

5 Revision History

Table 1 provides revision history information for this document.

Table 1. Revision History

Rev . No. Substantial Changes Date

0 Initial Release December 2002
1 • Section 3: added information about calibration routine.

• Section 4: added information about detection of latent
fingerprint images.

January 2003

2 • Added Section 2.1, “Flash Version.”

• Added web server information to Section 4.

May 2003

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