WO2015113472A1

WO2015113472A1 - Method and device for detecting interface access mode of smart key device

Info

Publication number: WO2015113472A1
Application number: PCT/CN2015/071200
Authority: WO
Inventors: 李东声
Original assignee: 天地融科技股份有限公司
Priority date: 2014-01-28
Filing date: 2015-01-21
Publication date: 2015-08-06
Also published as: CN103760451A; CN103760451B

Abstract

A method and device for detecting an interface access mode of a smart key device, capable of enabling a smart key device to obtain an access mode and enter an operational state corresponding to the mode. The method comprises: a detection module is connected to a D+ pin of a USB interface via a first detection pin, and is connected to a D- pin via a second detection pin (101); the first detection pin outputs a high level to the D+ pin (102), it is detected whether the first detection pin and the second detection pin receive a terminal handshake signal, and a first level of the second detection pin is detected (103); if the terminal handshake signal is received, it is determined that an access mode is a USB information transmission mode, and the smart key device enters a corresponding operational state (104); if the terminal handshake signal is not received and the first level of the second detection pin is the high level, the first detection pin outputs a low level to the D+ pin (105), a second level of the second detection pin is detected, and if the second level of the second detection pin is the low level, it is determined that the access mode is a charger mode, and the smart key device enters a corresponding operational state (106).

Description

Method and device for detecting interface access mode of smart key device

Technical field

The present invention relates to the field of electronic technologies, and in particular, to a method and a device for detecting an interface access mode of a smart key device.

Background technique

At present, smart key equipment is an important tool to protect the security of online banking funds. From a technical point of view, smart key equipment is a tool for online banking electronic signature and data authentication. It has a built-in micro security chip and uses a key algorithm. Online data is encrypted, decrypted and digitally signed to ensure the confidentiality, authenticity, integrity and non-repudiation of online transactions.

Most of the smart key device chargers use a USB (Universal Serial BUS) charging interface that supports the national charging standard, and the smart key device also transmits data to the terminal through the USB interface. This causes when the smart key device and other devices are connected through the USB interface, and cannot determine whether the connected device is a terminal or a charger, and thus the access mode cannot be correctly displayed on the screen of the smart key device, and the smart key device cannot be based on The access mode enters the working state of the access mode.

Summary of the invention

The present invention is directed to solving one of the above problems.

A main object of the present invention is to provide a method for detecting an interface access mode of a smart key device.

Another object of the present invention is to provide an interface access mode detecting device of a smart key device.

In order to achieve the above object, the technical solution of the present invention is specifically implemented as follows:

The present invention provides a method for detecting an interface access mode of a smart key device, including:

The detecting module is connected to the D+ pin of the USB interface through the first detecting pin of the detecting module, and is connected to the D- pin of the USB interface through the second detecting pin of the detecting module;

The detecting module outputs a high level to the D+ pin through the first detecting pin, and the detecting module detects whether the first detecting pin and the second detecting pin receive a terminal handshake signal and Detecting a level of the second detection pin;

If the detecting module detects that the first detecting pin and the second detecting pin receive the terminal handshake signal, determining that the access mode is a USB information transmission mode, and the smart key device enters the USB Information transmission module Working state

If the detecting module detects that the first detecting pin and the second detecting pin do not receive the terminal handshake signal and detects that the first level of the second detecting pin is a high level The detecting module outputs a low level to the D+ pin through the first detecting pin, and detects a second level of the second detecting pin;

If the second level of the second detection pin is a low level, it is determined that the access mode is a charger mode, and the smart key device enters a charger mode operation state.

Furthermore, between the step of if the second level of the second detecting pin is a low level and the step of determining that the access mode is a charger mode, the following steps are further included:

The detecting module outputs a high level to the D+ through the first detecting pin, and detects a third level of the second detecting pin;

If the third level of the second detection pin is a high level, it is determined that the access mode is a charger mode.

In addition, the method further includes:

If the detecting module detects that the first detecting pin and the second detecting pin do not receive a terminal handshake signal and the first level of the second detecting pin is a low level, The detecting module continues to output a high level to the D+ pin through the first detecting pin until the detecting module detects that the level of the second detecting pin is a high level or the first detecting pin And the second detecting pin receives the terminal handshake signal.

Another aspect of the present invention provides an interface access mode detecting device of a smart key device, including a detecting module and a USB interface;

The USB interface includes a D-pin and a D+ pin;

The detecting module includes an output unit, a detecting unit, and a determining unit;

The output unit is connected to the D+ pin, and the detecting unit is connected to the D+ pin and the D- pin;

The detecting unit is connected to the output unit;

The determining unit is connected to the detecting unit;

The output unit is configured to output a high level to the D+ pin;

The detecting unit is configured to detect, after the output unit outputs a high level to the D+ pin, whether the D+ pin and the D- pin receive a terminal handshake signal and detect the D-reference a level of the foot, the detection result is sent to the output unit and the determining unit;

The determining unit is configured to: if the detecting unit detects that the D+ pin and the D- pin receive the terminal handshake signal, determine that the access mode is a USB information transmission mode, and the smart key device enters the USB Information transmission mode working state;

The output unit is further configured to: if the detecting unit detects that the D+ pin and the D- pin are not received The terminal handshake signal detects that the first level of the D-pin is a high level, and outputs a low level to the D+ pin;

The detecting unit is further configured to: after the output unit outputs a low level to the D+ pin, detect a second level of the D-pin, and send the detection result to the output unit and the Determining unit;

The determining unit is further configured to: if the output unit outputs a low level to the D+ pin, the detecting unit detects that the second level of the D-pin is a low level, and determines that The access mode is a charger mode, and the smart key device enters a charger mode working state.

In addition,

The output unit is further configured to output a high level to the D+ pin after the detecting unit detects that the second level of the D-pin is a low level;

The detecting unit is further configured to: after the output unit outputs a high level to the D+ pin, detecting a third level of the D-pin;

The determining unit is further configured to determine that the access mode is a charger mode if the detecting unit detects that the third level of the D-pin is a high level.

In addition, the output unit is further configured to: if the detecting unit detects that the D+ pin and the D- pin do not receive the terminal handshake signal and the first level of the D-pin is low Level, continuing to output a high level to the D+ pin until the detecting unit detects that the D-pin level is high or detects that the D+ pin and the D- pin are received The terminal handshake signal up to now.

It can be seen from the technical solution provided by the present invention that the interface access mode detection method and device of the smart key device provided by the present invention are adopted, and the detection module detects the D+ lead by inputting a high level to the D+ pin of the USB interface. The receiving terminal handshake signal of the pin and the D-pin and detecting the first level of the D-pin can determine whether the access mode of the USB interface connected to the smart key device is the USB information transmission mode, if the D-reference The first level of the pin is high, and the low level can be further input to the D+ pin. If the second level of the D- pin is low, it can be judged that the access mode is the charger mode. After the smart key device learns the access mode, the smart key device can be further brought into a corresponding working state, and the display screen correctly displays the working state of the smart key device.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those of ordinary skill in the art will be able to obtain other figures from these drawings without the inventive effort.

1 is a flowchart of a method for detecting an interface access mode of a smart key device according to Embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of an interface access mode detecting device of a smart key device according to Embodiment 1 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and The simplification of the description is not intended to limit or imply that the device or component that is referred to has a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting. Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or location.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

1 is a flowchart of a method for detecting an interface access mode of a smart key device according to the present invention. Referring to FIG. 1, a method for detecting an interface access mode of a smart key device according to the present invention includes:

S101, the detecting module is connected to the D+ pin of the USB interface through a first detecting pin of the detecting module, and is connected to a D- pin of the USB interface through a second detecting pin of the detecting module;

In this embodiment, the USB interface is a USB charger interface or a USB connection line interface connected to the terminal, and the terminal may be a personal computer, a tablet computer, a mobile phone, a smart TV, smart glasses, and a device with a data transmission function that appears in the future. Optionally, the detecting module may be a circuit that is independently disposed outside the security chip in the smart key device, or may be a module that can implement the detecting function inside the security chip.

S102. The detecting module outputs a high level to the D+ pin through the first detecting pin.

In the present embodiment, the high level is a voltage whose voltage value fluctuates within a range of 3.0 V to 3.6 V, or a voltage whose voltage value is a fixed value within a range of 3.0 V to 3.6 V.

S103. The detecting module detects whether the first detection pin and the second detection pin receive a terminal handshake signal and detect a first level of the second detection pin.

In this embodiment, the terminal handshake signal is a communication handshake signal sent by the terminal to the smart key device, and the purpose is to establish a USB communication connection with the smart key device. The terminal handshake signal is a group of signals with short transmission time, and the transmission time is much shorter than the duration of the high level or low level input by the first detection pin. Therefore, the detection process of the terminal handshake signal does not affect the judgment. The level of the second detection pin.

S104. If the detecting module detects that the first detecting pin and the second detecting pin receive the terminal handshake signal, determining that the access mode is a USB information transmission mode, and the smart key device enters the USB. Information transmission mode working state;

In this embodiment, the step may further include: the smart key device display screen indicates that the communication is in progress.

The smart key device enters the USB data communication mode, that is, the smart key device receives the handshake information sent by the terminal, and after establishing a connection with the terminal, can receive the data to be signed, and after signing the signature data, send the signed information to the terminal. To ensure the confidentiality, authenticity, integrity and non-repudiation of terminal transaction data.

S105. If the detecting module detects that the first detecting pin and the second detecting pin do not receive the terminal handshake signal and detects that the first level of the second detecting pin is high level, The detecting module outputs a low level to the D+ pin through the first detecting pin, and detects a second level of the second detecting pin;

In the present embodiment, the low level is a voltage whose voltage value fluctuates within a range of 0 V to 0.3 V, or a voltage whose voltage value is a fixed value within a range of 0 V to 0.3 V.

S106. If the second level of the second detection pin is a low level, determine that the access mode is a charger mode, and the smart key device enters a charger mode working state.

In this embodiment, the step may further include: the smart key device display screen is displaying charging.

The smart key device enters the charger mode working state, that is, sends an enable signal to the charger enable input terminal, and the charger starts charging after receiving the enable signal.

In addition, in this embodiment, between the step of if the second level of the second detecting pin is a low level and the step of determining that the access mode is a charger mode, the following steps may be further included :

S106a, the detecting module outputs a high level to the D+ through the first detecting pin, and detects a third level of the second detecting pin;

S106b, if the third level of the second detection pin is a high level, determining that the access mode is a charger mode.

In this embodiment, in the embodiment, the level of the second detection pin needs to be detected three times to determine that the access mode is the charger mode, that is, the detection module outputs to the D+ pin through the first detection pin. a high level, detecting that the first level of the second pin is a high level; the detecting module outputs a low level to the D+ pin through the first detecting pin, and detecting that the second level of the second detecting pin is a low level; The detecting module outputs a high level to the D+ pin through the first detecting pin, and detects that the third level of the second detecting pin is high level; determining that the access mode is the charger mode.

Using the three-detection scheme, the third detection is performed on whether the level of the second detection pin and the first detection pin are the same, which can overcome the low detection of the second detection pin from the D-reference. The other signals received by the pin, rather than the low level of the D+ pin input, cause problems with the error judgment.

In this embodiment, the method further includes:

S107, if the detecting module detects that the first detecting pin and the second detecting pin do not receive a terminal handshake signal and the first level of the second detecting pin is a low level, The detecting module continues to output a high level to the D+ pin through the first detecting pin until the detecting module detects that the level of the second detecting pin is a high level or the first detecting pin And the second detecting pin receives the terminal handshake signal.

In this embodiment, since the D+ pin must be in a high state during USB communication, communication can be performed normally. Therefore, if the detection module inputs a high level to the D+ pin through the first detection pin, the level of the second detection pin is a low level, and it is determined that the D- pin receives another unknown signal, and the detection module passes the first detection. The pin continues to input a high level to the D+ pin and waits for the detection result. When the access mode detection is performed, if it is temporarily unable to determine which access mode, the D+ pin is in a high state and will not affect. USB normal communication process.

It can be seen from the technical solution provided by the foregoing embodiment that the interface access mode detection method of the smart key device provided by the embodiment is adopted, and the detection module inputs a high level to the D+ pin of the USB interface through the first detection pin. Detecting whether the first detection pin and the second detection pin receive the terminal handshake signal and the first level of the second detection pin, and determining whether the access mode of the USB interface accessing the smart key device is USB information transmission mode, if the first level of the second detection pin is high, the first detection pin can further input a low level to the D+ pin, if the second level of the second detection pin is Low level, you can judge the access mode to charger mode. After the access mode is determined, the smart key device can be further brought into a corresponding working state, and the display screen correctly displays the working state of the smart key device. If the access mode cannot be determined, continue to input a high level to the D+ pin through the first detection pin to continuously detect the access status, and does not affect other USB information transmission during the detection process.

Example 2

2 is a schematic structural diagram of an interface access mode detecting device of the smart key device of the present invention. Referring to FIG. 2, the interface access mode detecting device of the smart key device of the present invention includes: a detecting module 201 and a USB interface 202. ;

The USB interface 202 includes a D+ pin 2021 and a D-pin 2022;

The detecting module 201 includes an output unit 2011, a detecting unit 2012, and a determining unit 2013;

The output unit 2011 is connected to the D+ pin 2021, and the detecting unit 2012 is connected to the D+ pin 2021 and the D-pin 2022;

The detecting unit 2012 is connected to the output unit 2011;

The determining unit 2013 is connected to the detecting unit 2012;

In this embodiment, the USB interface 202 is a USB charger interface or a USB connection line interface connected to the terminal, and the terminal can be a personal computer, a tablet computer, a mobile phone, a smart TV, smart glasses, and a device with data transmission function appearing in the future. . Optionally, the detecting module 201 may be a circuit that is independently disposed outside the security chip in the smart key device, or may be a module that can implement the detecting function inside the security chip.

The output unit 2011 is configured to output a high level to the D+ pin 2021.

The detecting unit 2012 is configured to detect, after the output unit 2011 outputs a high level to the D+ pin, whether the D+ pin 2021 and the D-pin 2022 receive a terminal handshake signal and a detection center. Describe the first level of the D-pin 2022, and send the detection result to the output unit 2011 and the determining unit 2013;

In this embodiment, the terminal handshake signal is a communication handshake signal sent by the terminal to the smart key device, and the purpose is to establish a USB communication connection with the smart key device. The terminal handshake signal is a group of signals with short transmission time, and the transmission time is much shorter than the duration of the high level or low level input by the D+ pin 2021. Therefore, the detection process of the terminal handshake signal does not affect the judgment D. - Level of pin 2022.

The determining unit 2013 is configured to: if the detecting unit 2012 detects that the D+ pin 2021 and the D-pin 2022 receive the terminal handshake signal, determine that the access mode is a USB information transmission mode, and output a determination result, Causing the smart key device to enter a USB information transmission mode working state;

In this embodiment, the method further includes: the smart key device display screen indicates that the communication is in progress. The smart key device enters the USB data communication mode, that is, receives the handshake information sent by the terminal, and after establishing a connection with the terminal, can receive the data to be signed, and after signing the signature data, send the signed information to the terminal to secure the terminal transaction. The confidentiality, authenticity, integrity and non-repudiation of the data.

The output unit 2011 is further configured to: if the detecting unit 2012 detects that the D+ pin 2021 and the D-pin 2022 do not receive the terminal handshake signal and detect the D-pin 2022 A level is a high level, and a low level is output to the D+ pin 2021.

In this embodiment, the low level is a voltage whose voltage value fluctuates within a range of 0V to 0.3V, or the voltage value is 0V to 0.3V. A fixed value of voltage within the range.

The detecting unit 2012 is further configured to: after the output unit 2011 outputs a low level to the D+ pin 2021, detect a second level of the D-pin 2022, and send the detection result to the An output unit 2011 and the determining unit 2013;

The determining unit 2013 is further configured to: if the output unit 2011 outputs a low level to the D+ pin 2021, the detecting unit 2012 detects that the second level of the D-pin 2022 is a low level. And determining that the access mode is a charger mode, and outputting a determination result, so that the smart key device enters a charger mode working state.

In this embodiment, the method further includes: the smart key device display screen indicates that charging is being performed.

The smart key device enters the charger mode working state, that is, the determining unit 2013 sends an enable signal to the charger enable input terminal, and the charger starts charging after receiving the enable signal.

In addition, in the embodiment, the output unit 2011 is further configured to output to the D+ pin 2021 after the detecting unit 2012 detects that the second level of the D-pin 2022 is a low level. High level

The detecting unit 2012 is further configured to detect the third level of the D-pin 2022 after the output unit 2011 outputs a high level to the D+ pin 2021.

The determining unit 2013 is further configured to determine that the access mode is a charger mode if the detecting unit 2012 detects that the third level of the D-pin 2021 is a high level.

In this embodiment, the detection unit 2012 needs to perform three detections on the level of the D-pin 2022 to determine that the access mode is the charger mode, that is, the output unit 2011 outputs a high level to the D+ pin 2021, and the detecting unit 2012 detects that the D-pin 2022 is at a high level; the output unit 2011 outputs a low level to the D+ pin 2021, the detecting unit 2012 detects that the D-pin 2022 is at a low level; and the output unit 2011 outputs a high power to the D+ pin 2021. The detection unit 2012 detects that the D+ pin 2021 is at a high level; the determination unit 2013 determines that the access mode is the charger mode.

Using the three-detection scheme, the third detection is performed on whether the D-pin 2022 and the D+ pin 2021 are in the same level, and the D-pin 2022 can be overcome from the D-pin when the two detections are overcome. The other signals received by the 2022, rather than the low level of the D+ pin 2021 input, cause the problem of misjudgment.

Also included in this embodiment,

The output unit 2011 is further configured to: if the detecting unit 2012 detects that the D+ pin 2021 and the D-pin 2022 do not receive the terminal handshake signal and the first level of the D-pin 2022 is Low level, continue to output a high level to the D+ pin 2021 until the detecting unit 2012 detects that the D-pin 2022 level is high or detects the D+ pin 2021 and the D - Pin 2022 receives the terminal handshake signal.

In this embodiment, since the D+ pin 2021 must be in a high state during USB communication, communication can be performed normally. Therefore, if the detection module 201 inputs a high level to the D+ pin 2021 through the input unit 2011, D- The first level of the pin 2022 is a low level, and it is determined that the D- pin 2022 receives other unknown signals, and the detecting module 201 continues to input a high level to the D+ pin 2021 through the input unit 2011 and waits for a detection result. When access mode detection is performed, if it is temporarily unable to determine which access mode, D+ pin 2011 is in a high state, it will not affect the normal USB communication process.

It can be seen from the technical solution provided by the foregoing embodiment that the interface access mode detecting device of the smart key device provided by the embodiment is used, and the detecting module 201 inputs high power to the D+ pin 2021 of the USB interface 202 through the input unit 2011. Ping, detecting whether the D+ pin 2021 and the D-pin 2022 receive the terminal handshake signal and the first level of the D-pin 2022, and can determine whether the access mode of the USB interface connected to the smart key device is USB information transmission mode, if the first level of the D-pin 2022 is high, the input unit 2011 can further input a low level to the D+ pin 2021 if the second level of the D-pin 2022 is low. Level, you can judge the access mode to charger mode. After the access mode is determined, the smart key device can be further brought into a corresponding working state, and the display screen correctly displays the working state of the smart key device. If the access mode cannot be determined, the detecting module 201 continues to input a high level to the D+ pin 2021 through the input unit 2011, and can continuously detect the access state, and does not affect other USB information transmission during the detection process.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in an opposite order depending on the functions involved, in the order shown or discussed. It will be understood by those skilled in the art to which the embodiments of the present invention pertain.

It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated module is It can be implemented in the form of hardware or in the form of a software function module. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, it is understood that the foregoing embodiments are illustrative and not restrictive Variations, modifications, alterations and variations of the above-described embodiments are possible within the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents.

Claims

A method for detecting an interface access mode of a smart key device, comprising:

The detecting module is connected to the D+ pin of the USB interface through the first detecting pin of the detecting module, and is connected to the D- pin of the USB interface through the second detecting pin of the detecting module;

The detecting module outputs a high level to the D+ pin through the first detecting pin, and the detecting module detects whether the first detecting pin and the second detecting pin receive a terminal handshake signal and Detecting a first level of the second detection pin;

If the detecting module detects that the first detecting pin and the second detecting pin receive the terminal handshake signal, determining that the access mode is a USB information transmission mode, and the smart key device enters the USB Information transmission mode working state;

If the detecting module detects that the first detecting pin and the second detecting pin do not receive the terminal handshake signal and detects that the first level of the second detecting pin is a high level The detecting module outputs a low level to the D+ pin through the first detecting pin, and detects a second level of the second detecting pin;

If the second level of the second detection pin is a low level, it is determined that the access mode is a charger mode, and the smart key device enters a charger mode operation state.
The method of claim 1 wherein said step of said second mode of said second detection pin being a low level and said step of determining said access mode being a charger mode In addition, the following steps are included:

The detecting module outputs a high level to the D+ through the first detecting pin, and detects a third level of the second detecting pin;

If the third level of the second detection pin is a high level, it is determined that the access mode is a charger mode.
The method of claim 1 further comprising:

If the detecting module detects that the first detecting pin and the second detecting pin do not receive a terminal handshake signal and the first level of the second detecting pin is a low level, The detecting module continues to output a high level to the D+ pin through the first detecting pin until the detecting module detects that the level of the second detecting pin is a high level or the first detecting pin And the second detecting pin receives the terminal handshake signal.
The method of claim 2, further comprising:

If the detecting module detects that the first detecting pin and the second detecting pin do not receive a terminal handshake signal and the first level of the second detecting pin is a low level, The detecting module continues to output a high level to the D+ pin through the first detecting pin until the detecting module detects that the level of the second detecting pin is a high level or the first detecting pin And the second detecting pin receives the terminal handshake signal.
An interface access mode detecting device of a smart key device, comprising: a detecting module and a USB interface;

The USB interface includes a D-pin and a D+ pin;

The detecting module includes an output unit, a detecting unit, and a determining unit;

The output unit is connected to the D+ pin, and the detecting unit is connected to the D+ pin and the D- pin;

The detecting unit is connected to the output unit;

The determining unit is connected to the detecting unit;

The output unit is configured to output a high level to the D+ pin;

The detecting unit is configured to detect, after the output unit outputs a high level to the D+ pin, whether the D+ pin and the D- pin receive a terminal handshake signal and detect the D-reference a first level of the foot, the detection result is sent to the output unit and the determining unit;

The determining unit is configured to: if the detecting unit detects that the D+ pin and the D- pin receive the terminal handshake signal, determine that the access mode is a USB information transmission mode, and the smart key device enters the USB Information transmission mode working state;

The output unit is further configured to: if the detecting unit detects that the D+ pin and the D- pin do not receive the terminal handshake signal and detect the first level of the D-pin Is high, outputting a low level to the D+ pin;

The detecting unit is further configured to: after the output unit outputs a low level to the D+ pin, detect a second level of the D-pin, and send the detection result to the output unit and the Determining unit;

The determining unit is further configured to: if the output unit outputs a low level to the D+ pin, the detecting unit detects that the second level of the D-pin is a low level, and determines that The access mode is a charger mode, and the smart key device enters a charger mode working state.
The device according to claim 5, characterized in that

The output unit is further configured to output a high level to the D+ pin after the detecting unit detects that the second level of the D-pin is a low level;

The detecting unit is further configured to: after the output unit outputs a high level to the D+ pin, detecting a third level of the D-pin;

The determining unit is further configured to determine that the access mode is a charger mode if the detecting unit detects that the third level of the D-pin is a high level.
The device according to claim 5, characterized in that

The output unit is further configured to: if the detecting unit detects that the D+ pin and the D- pin do not receive the terminal handshake signal, and the first level of the D- pin is a low level And continuing to output a high level to the D+ pin until the detecting unit detects that the D-pin level is high or detects that the D+ pin and the D- pin receive the The terminal handshake signal is up.
The device according to claim 6 wherein:

The output unit is further configured to: if the detecting unit detects that the D+ pin and the D- pin do not receive the terminal handshake signal, and the first level of the D- pin is a low level And continuing to output a high level to the D+ pin until the detecting unit detects that the D-pin level is high or detects that the D+ pin and the D- pin receive the The terminal handshake signal is up.