IP Library › Granted Patent US 12,711,810

Granted Patent B2

US 12,711,810 · App. 19/135,272 · Granted Aug 18, 2026

Method, apparatus and system for implementing fingerprint enrollment

Inventors: Baohua Ma (Beijing, CN); Zhou Lu (Beijing, CN)

Assignee: Feitian Technologies Co., Ltd.

G06V40/50 G06V40/67

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Quick Facts

Patent No.: US 12,711,810
App. No.: 19/135,272
Granted: Aug 18, 2026
Kind: B2

External Links

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Abstract

A method for implementing fingerprint enrollment. Upon detecting a level change at a card presence detect pin of a card holder, an MCU controls to supply power to a fourth contact of a card holder after pulling down a fifth I/O pin, controls a second I/O pin and a third I/O pin to output low and high levels respectively. The MCU enables and resets a second timer when the first contact of the card holder outputs the high and low levels in sequence; delays a second preset duration when the first contact of the card holder outputs the high level and a count of the second timer is within a first preset range; prompts that the fingerprint enrollment is successful when the first contact of the card holder outputs the low level, and prompts a user to enroll his fingerprint when a first timer reaches the first preset duration.

Claims (130)

1 . An apparatus for implementing fingerprint enrollment, comprising:

at least one processor, a memory, and instructions stored on the memory and executable by the at least one processor, wherein the at least one processor executes the instructions to implement the following steps:

Step S 1 : upon detecting a level change at a card presence detect pin of a card holder, controlling, by a microcontroller unit (MCU), a MOSFET to turn on to supply power to a fourth contact of the card holder after pulling down a fifth I/O pin, and controlling, by the MCU, a second I/O pin to output a low level and a third I/O pin to output a high level;

Step S 2 : determining, by the MCU, whether an output level of a first contact of the card holder is a high level; if so, executing Step S 3 ; otherwise, returning to the Step S 2 ;

Step S 3 : determining, by the MCU, whether the output level of the first contact of the card holder is a low level; if so, enabling and resetting a second timer, and executing Step S 4 ; otherwise, returning to the Step S 3 ;

Step S 4 : determining, by the MCU, whether the output level of the first contact of the card holder is the high level; if so, executing Step S 6 ; otherwise, executing Step S 5 ;

Step S 5 : determining, by the MCU, whether a count of the second timer is less than a second preset duration; if so, returning to the Step S 4 ; otherwise, prompting that a fingerprint card is malfunctioning;

Step S 6 : determining, by the MCU, whether the count of the second timer is within a first preset range; if so, delaying the second preset duration and executing Step S 8 ; otherwise, executing Step S 7 ;

Step S 7 : determining, by the MCU, whether the count of the second timer is within a second preset range; if so, returning to the Step S 3 ; otherwise, prompting that the fingerprint card is malfunctioning;

Step S 8 : detecting, by the MCU, the output level of the first contact of the card holder; if the output level of the first contact of the card holder is the low level, prompting that the fingerprint enrollment is successful; if the output level of the first contact of the card holder is the high level, prompting that the fingerprint enrollment is failed;

between the Step S 1 and the Step S 2 , the at least one processor further executes the instructions to implement the following steps: initializing, by the MCU, a first timer, setting an interrupt time to a first preset duration, and enabling a timer interrupt; and

and the at least one processor further executes the instructions to implement the following steps: entering a timer interrupt processing when the first timer reaches the first preset duration, wherein the timer interrupt processing comprises prompting a user to enroll a fingerprint.

2 . The apparatus according to claim 1 , wherein the at least one processor further executes the instructions to implement the following steps:

writing, by the MCU, a first preset character into a display memory inside the MCU, driving, by the MCU, a drive pin to output a first drive signal;

after receiving the first drive signal, displaying, by a screen, the first preset character under drive of the first drive signal;

wherein the prompting that the fingerprint enrollment is failed, comprises:

writing, by the MCU, a second preset character into the display memory inside the MCU, driving, by the MCU, a drive pin to output a second drive signal;

after receiving the second drive signal, displaying, by the screen, the second preset character under drive of the second drive signal;

wherein the prompting that the fingerprint enrollment is successful, comprises:

writing, by the MCU, a number of successful fingerprint enrollments and a third preset character into the display memory inside the MCU, and driving, by the MCU, a drive pin to output a third drive signal; and

after receiving the third drive signal, displaying, by the screen, the number of successful fingerprint enrollments and the third preset character under drive of the third drive signal.

3 . The apparatus according to claim 1 , wherein the at least one processor further executes the instructions to implement the following steps between the Step S 1 and the Step S 2 : initializing, by the MCU, a number of times for which a fingerprint of each finger needs to be enrolled and/or a number of fingers that need to be enrolled;

before the prompting that the fingerprint enrollment is successful in the Step S 8 , the at least one processor further executes the instructions to implement the following steps: enrolling a fingerprint of a current finger multiple times and/or enrolling fingerprints of multiple fingers;

wherein the enrolling a fingerprint of a current finger multiple times comprises:

Step P 1 : updating, by the MCU, a number of successful fingerprint enrollments for the current finger and prompting an enrollment progress;

Step P 2 : determining, by the MCU, whether the enrollment of the current finger has been completed based on the number of successful fingerprint enrollments for the current finger and the number of times for which the fingerprint of each finger needs to be enrolled; if so, the enrollment for the current finger has been completed; otherwise, returning to the Step S 2 ;

wherein the enrolling fingerprints of multiple fingers comprises:

Step Q 1 : after the enrollment of the current finger has been completed, updating, by the MCU, a number of fingers whose enrollments have been completed, determining whether another finger needs to be enrolled based on the number of fingers whose enrollments have been completed and the number of fingers that need to be enrolled; if so, taking a next to-be-enrolled finger as the current finger, and executing Step Q 2 ; otherwise, executing Step Q 3 ;

Step Q 2 : prompting, by the MCU, a number of fingers currently being enrolled, and returning to the Step S 2 ; and

Step Q 3 : after pulling up the fifth I/O pin, controlling, by the MCU, the MOSFET to turn off to disconnect power to the fourth contact of the card holder, and controlling, by the MCU, the second I/O pin to output a high level and the third I/O pin to output a low level.

4 . The apparatus according to claim 3 , wherein the at least one processor further executes the instructions to implement the following steps:

updating, by the MCU, progress information based on the number of successful fingerprint enrollments for the current finger, writing the progress information into a display memory inside the MCU, and driving, by the MCU, a drive pinto output a progress drive signal;

after receiving the progress drive signal, displaying, by a screen, a fingerprint enrollment progress based on the progress information under drive of the progress drive signal;

wherein the prompting, by the MCU, a number of fingers currently being enrolled, comprises:

Step Q 21 : updating, by the MCU, the number of fingers currently being enrolled based on the number of fingers whose enrollments have been completed, writing the number of fingers currently being enrolled into the display memory inside the MCU, and driving, by the MCU, a drive pin to output a quantity drive signal; and

Step Q 22 : after receiving the quantity drive signal, displaying, by the screen, the number of fingers currently being enrolled under drive of the quantity drive signal.

5 . The apparatus according to claim 3 , wherein between Step S 1 and Step S 2 , the at least one processor further executes the instructions to implement the following steps: setting, by the MCU, to allow a fingerprint icon and a numeric icon to flash, and setting, by the MCU, to allow the fingerprint icon and the numeric icon to be displayed;

wherein the prompting the user to enroll the fingerprint, comprises:

Step A 1 : determining, by the MCU, whether the fingerprint icon is allowed to flash; if so, executing Step A 2 ; otherwise, executing Step A 7 ;

Step A 2 : determining, by the MCU, whether the fingerprint icon is allowed to be displayed; if so, executing Step A 3 ; otherwise, executing Step A 5 ;

Step A 3 : writing, by the MCU, the fingerprint icon into a display memory inside the MCU, and driving, by the MCU, a drive pin to output a fingerprint drive signal;

Step A 4 : after receiving the fingerprint drive signal, displaying, by a screen, the fingerprint icon under drive of the fingerprint drive signal, and Step A 7 is executed;

Step A 5 : clearing, by the MCU, the fingerprint icon in the display memory inside the MCU and driving, by the MCU, a drive pin to output a clearing drive signal;

Step A 6 : after receiving the clearing drive signal, clearing, by the screen, the displayed fingerprint icon under drive of the clearing drive signal, and Step A 7 is executed;

Step A 7 : determining, by the MCU, whether the numeric icon is allowed to flash; if so, executing Step A 8 ; otherwise, exiting the timer interrupt;

Step A 8 : determining, by the MCU, whether the numeric icon is allowed to be displayed; if so, executing Step A 9 ; otherwise, executing Step A 11 ;

Step A 9 : writing, by the MCU, the numeric icon indicating the number of fingers currently being enrolled into the display memory inside the MCU, and driving, by the MCU, a drive pin to output a numeric drive signal;

Step A 10 : after receiving the numeric drive signal, displaying, by the screen, the numeric icon under drive of the numeric drive signal, and the timer interrupt is exited;

Step A 11 : clearing, by MCU, the numeric icon in the display memory inside the MCU and driving, by MCU, a drive pin to output a clearing drive signal;

Step A 12 : after receiving the clearing drive signal, clearing, by the screen, the displayed numeric icon under drive of the clearing drive signal, and the timer interrupt is exited;

when enrolling the fingerprint of each finger multiple times and enrolling the fingerprints of the multiple fingers, the Step P 1 further comprises: setting to disallow the fingerprint icon from flashing;

Step Q 2 further comprises: setting to allow the fingerprint icon to flash; and

Step Q 3 further comprises: disabling the timer interrupt.

6 . The apparatus according to claim 1 , wherein after prompting that the fingerprint card is malfunctioning and/or prompting that the fingerprint enrollment is successful, the at least one processor further executes the instructions to implement the following steps:

Step D 1 : enabling, by the MCU, a third timer, and driving, by the MCU, a drive pin to output a clearing drive signal when a count of the third timer reaches a third preset duration;

Step D 2 : after receiving the clearing drive signal, clearing, by a screen, displayed content under drive of the clearing drive signal, and returning, by the screen, a success signal to the MCU after the clearing is completed; and

Step D 3 : after receiving the success signal, executing, by the MCU, a sleep command, and enabling a device to enter a sleep state.

7 . A method for implementing fingerprint enrollment, comprising:

Step S 2 : determining, by the MCU, whether an output level of a first contact of the card holder is a high level; if so, executing Step S 3 ; otherwise, returning to the Step S 2 ;

Step S 4 : determining, by the MCU, whether the output level of the first contact of the card holder is the high level; if so, executing Step S 6 ; otherwise, executing Step S 5 ;

between the Step S 1 and the Step S 2 , the method comprises: initializing, by the MCU, a first timer, setting an interrupt time to a first preset duration, and enabling a timer interrupt; and

the method further comprises: entering a timer interrupt processing when the first timer reaches the first preset duration, wherein the timer interrupt processing comprises prompting a user to enroll a fingerprint.

8 . The method according to claim 7 , wherein prompting that the fingerprint card is malfunctioning, comprises:

writing, by the MCU, a first preset character into a display memory inside the MCU, driving, by the MCU, a drive pin to output a first drive signal;

after receiving the first drive signal, displaying, by a screen, the first preset character under drive of the first drive signal;

wherein the prompting that the fingerprint enrollment is failed, comprises:

writing, by the MCU, a second preset character into the display memory inside the MCU, driving, by the MCU, a drive pin to output a second drive signal;

after receiving the second drive signal, displaying, by the screen, the second preset character under drive of the second drive signal;

wherein the prompting that the fingerprint enrollment is successful, comprises:

after receiving the third drive signal, displaying, by the screen, the number of successful fingerprint enrollments and the third preset character under drive of the third drive signal.

9 . The method according to claim 7 , wherein between Step S 1 and Step S 2 , the method comprises: initializing, by the MCU, a number of times for which a fingerprint of each finger needs to be enrolled and/or a number of fingers that need to be enrolled;

before the prompting that the fingerprint enrollment is successful in the Step S 8 , the method further comprises: enrolling a fingerprint of a current finger multiple times and/or enrolling fingerprints of multiple fingers;

wherein the enrolling a fingerprint of a current finger multiple times comprises:

Step P 1 : updating, by the MCU, a number of successful fingerprint enrollments for the current finger and prompting an enrollment progress;

wherein the enrolling fingerprints of multiple fingers comprises:

Step Q 2 : prompting, by the MCU, a number of fingers currently being enrolled, and returning to the Step S 2 ; and

10 . The method according to claim 9 , wherein prompting the enrollment progress comprises:

after receiving the progress drive signal, displaying, by a screen, a fingerprint enrollment progress based on the progress information under drive of the progress drive signal; and

wherein the prompting, by the MCU, a number of fingers currently being enrolled, comprises:

Step Q 22 : after receiving the quantity drive signal, displaying, by the screen, the number of fingers currently being enrolled under drive of the quantity drive signal.

11 . The method according to claim 9 , wherein between Step S 1 and Step S 2 , the method further comprises: setting, by the MCU, to allow a fingerprint icon and a numeric icon to flash, and setting, by the MCU, to allow the fingerprint icon and the numeric icon to be displayed;