CN105893301A - Control circuit of external functional module, external functional module and terminal device - Google Patents

Control circuit of external functional module, external functional module and terminal device Download PDF

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Publication number
CN105893301A
CN105893301A CN201510183227.9A CN201510183227A CN105893301A CN 105893301 A CN105893301 A CN 105893301A CN 201510183227 A CN201510183227 A CN 201510183227A CN 105893301 A CN105893301 A CN 105893301A
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China
Prior art keywords
circuit
external
function module
detection
terminal unit
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CN201510183227.9A
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Chinese (zh)
Inventor
刘伟
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Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Leshi Zhixin Electronic Technology Tianjin Co Ltd
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Priority to CN201510183227.9A priority Critical patent/CN105893301A/en
Publication of CN105893301A publication Critical patent/CN105893301A/en
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Abstract

The present invention discloses a control circuit of an external functional module, the external functional module and a terminal device. The control circuit of an external functional module comprises: a first control circuit that is arranged in an external functional module and a second control circuit that is arranged in a terminal. The first control circuit comprises: an external functional module processor; a first GPIO circuit; a first access detection circuit; and a first connector, provided with a first pin used for access detection and data communication of an external functional module. The second control circuit comprises: a second connector, provided with a third pin matched with the first pin; a second access detection circuit; a second GPIO circuit; and a terminal device processor. According to the control circuit of the external functional module, the external functional module and the terminal device, which are disclosed by the present invention, the problem that the terminal is incapable of simultaneously implementing access detection and communication control by using one pin when the external functional module is connected to the terminal device in the prior art is solved, the flexibility of access of external modules is increased, space occupancy is reduced, and furthermore, a utilization rate of resources is improved.

Description

The control circuit of external connecting function module, external connecting function module and terminal unit
Technical field
The present invention relates to communication field, in particular to control circuit, external connecting function module and the terminal unit of a kind of external connecting function module.
Background technology
Along with the development of Internet technology, the terminal unit such as intelligent television, panel computer is widely used, and people are when using terminal unit, in addition to using the function of himself, by accessing difference in functionality module, the function of terminal unit can also be extended, to realize the function of abundant terminal unit.
In prior art after the functional module of non-standard interface is linked into terminal unit, terminal unit can detect the state that this external connecting function module accesses, further, terminal unit can realize carrying out data communication with this external connection module, and is powered this functional module.When implementing, terminal unit needs to use multiple different function pin just can complete above-mentioned difference in functionality, such as, the detection pin of detection, the control pin for Communication Control and the charging pin for charging it is separately provided at the connector position of terminal unit, after functional module accesses, after the pin that detection pin, control pin and charging pin are corresponding with external connecting function module respectively connects, respective function could be realized.But, under specific circumstances, for interface pin limited amount system, such as, using the standard interface design modules such as HDMI TYPE A, only a spare interface can use, in this case, it is impossible to use a pin to realize above-mentioned detection function and Communication Control function simultaneously.
For when in prior art, external connecting function module is linked into terminal unit, terminal unit cannot use a pin to realize accessing the problem of detection and Communication Control simultaneously, the most not yet proposes effective solution.
Summary of the invention
The invention provides the control circuit of a kind of external connecting function module, external connecting function module and terminal unit, during at least to solve that in prior art, external connecting function module is linked into terminal unit, terminal unit cannot use the problem that a pin realizes accessing detection and Communication Control simultaneously.
According to an aspect of the present invention, provide the control circuit of a kind of external connecting function module, including: being arranged on the first control circuit of external connecting function module and be arranged on the second control circuit of terminal unit, wherein, first control circuit includes: external connecting function module handler;Oneth GPIO circuit, the first end of a GPIO circuit is connected with external connecting function module handler, for carrying out data communication with terminal unit;First detection circuit for access, the first end of the first detection circuit for access and GPIO circuit second end connect, and when detecting that external connecting function module is linked into terminal unit, will access signal and be sent to external connecting function module handler by a GPIO circuit;First adapter, for being connected with terminal unit, wherein, the second end that the first adapter is provided with the first pin accessing detection and data communication for external connecting function module, the first pin and a GPIO circuit connects;Second control circuit includes: the second adapter, for being connected with the first adapter, the second adapter is provided with the three-prong matched with the first pin;Second detection circuit for access, the first end of the second detection circuit for access and three-prong connect, and when detecting that external connecting function module is linked into terminal unit, will access signal and send to external connecting function module handler;2nd GPIO circuit, the first end of the 2nd GPIO circuit and three-prong connect;Terminal unit processor, is connected with the second end of the second detection circuit for access and the second end of the 2nd GPIO circuit respectively.
Further, the first detection circuit for access includes: detection resistance, and detection resistance the first end is connected with the second end and first pin of the 2nd GPIO circuit respectively, and detection resistance the second end is connected with earth signal.
Further, the second detection circuit for access includes: detection voltage;Pull-up resistor, the first end of pull-up resistor and three-prong connect, and the second end of pull-up resistor is connected with detection voltage;Adc circuit, first end of adc circuit is connected with the first end of pull-up resistor, second end of adc circuit is connected with terminal unit processor, for analog digital conversion, wherein, when external connecting function module is linked into terminal unit, 2nd GPIO circuit is set to high-impedance state by terminal unit processor, and detection voltage, pull-up resistor are to adc circuit input voltage signal, after adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close detection voltage, and adc circuit is set to high-impedance state.
Further, the first adapter is provided with the second pin for power supply;Being provided with the 4th pin for power supply on second adapter, the 4th pin and the second pin match;Second control circuit also includes: power module, is connected with the 4th pin, for external connecting function module for power supply.
According to a further aspect in the invention, it is provided that a kind of external connecting function module, including external connecting function module handler;Oneth GPIO circuit, the first end of a GPIO circuit is connected with external connecting function module handler, for carrying out data communication with terminal unit;First detection circuit for access, the first end of the first detection circuit for access and the second end of a GPIO circuit connect, and when detecting that external connecting function module is linked into terminal unit, will access signal and be sent to external connecting function module handler by a GPIO circuit;First adapter, for being connected with terminal unit, wherein, the second end that the first adapter is provided with the first pin accessing detection and data communication for external connecting function module, the first pin and a GPIO circuit connects.
Further, the first detection circuit for access includes: detection resistance, and detection resistance the first end is connected with external connecting function module handler and the first pin respectively, and detection resistance the second end is connected with earth signal.
Further, the first adapter is provided with the second pin for power supply.
According to a further aspect in the invention, provide a kind of terminal unit, including: the second adapter, for being connected with external connecting function module, wherein, it is provided with three-prong, for when terminal unit accesses external connecting function module, carrying out access detection and the data communication of external connecting function module on second adapter;Second detection circuit for access, the first end of the second detection circuit for access and three-prong connect, and when detecting that external connecting function module is linked into terminal unit, will access signal and send to external connecting function module handler;2nd GPIO circuit, the first end of the 2nd GPIO circuit and three-prong are connected to carry out data communication with external connecting function module;Terminal unit processor, is connected with the second end of the second detection circuit for access and the second end of the 2nd GPIO circuit respectively.
Further, the second detection circuit for access includes: detection voltage;Pull-up resistor, the first end of pull-up resistor and three-prong connect, and the second end of pull-up resistor is connected with detection voltage;Adc circuit, first end of adc circuit is connected with the first end of pull-up resistor, second end of adc circuit is connected with terminal unit processor, for analog digital conversion, wherein, when external connecting function module is linked into terminal unit, 2nd GPIO circuit is set to high-impedance state by terminal unit processor, and detection voltage, pull-up resistor are to adc circuit input voltage signal, after adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close detection voltage, and adc circuit is set to high-impedance state.
Further, the second adapter is provided with the 4th pin for power supply;Second control circuit also includes: power module, is connected with the 4th pin, for external connecting function module for power supply.
nullTo be used for detecting pin that external connecting function module accesses on local side position and the pin being used for carrying out Communication Control with external connecting function module is set to same in the present invention,Adapt,For detecting the pin of external connecting function module access and being also configured as same for carrying out the pin of Communication Control with external connecting function module on external connecting function modular connector,When external connecting function module is linked into terminal unit,In advance the 2nd GPIO circuit being used for Control on Communication is set to high-impedance state,By external connecting function module side the first detection circuit for access and terminal equipment side the second detection circuit for access with the use of,The detection of the access to external connecting function module can be realized,Afterwards,Detection function is closed by controlling the second detection circuit for access,Utilize the Communication Control function of a GPIO circuit of external connecting function module side and the 2nd GPIO circuit realiration external connecting function module of terminal equipment side and terminal unit.During stating in realization, only a pin need to be used can to realize access detection and the Communication Control of external connecting function module, when efficiently solving that in prior art, external connecting function module is linked into terminal unit, terminal unit cannot use the problem that a pin realizes accessing detection and Communication Control simultaneously, increase the motility that external connection module accesses, reduce taking of space, further, also improve the utilization rate of resource.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is a kind of optional structure chart of the control circuit of external connecting function module according to embodiments of the present invention;
Fig. 2 is the another kind of optional structure chart of the control circuit of external connecting function module according to embodiments of the present invention;And
Fig. 3 is a kind of optional structure chart of the concrete application scenarios of control circuit of external connecting function module according to embodiments of the present invention.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing showing the exemplary embodiment of the disclosure, it being understood, however, that may be realized in various forms the disclosure and should not limited by embodiments set forth here.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
Embodiment 1
The control circuit of a kind of external connecting function module is provided in embodiments of the invention 1, including being arranged on the first control circuit of external connecting function module and being arranged on the second control circuit of terminal unit, specifically, Fig. 1 illustrates a kind of optional structure chart of the control circuit of this external connecting function module, as shown in Figure 1
First control circuit includes:
External connecting function module handler 10;Oneth GPIO(General Purpose Input Output, universal input/output) circuit 12, first end of the oneth GPIO circuit 12 is connected with external connecting function module handler 10, oneth GPIO circuit 12 can realize the data communication control of external connecting function module and terminal unit as universal input output, preferably, in actual mechanical process, general input/output port can be comprised in external connecting function module handler 10, that is, the oneth GPIO circuit 12 is integrated in external connecting function module handler 10;First detection circuit for access 14, first end of the first detection circuit for access 14 and the second end of a GPIO circuit 12 connect, for whether external connecting function module is linked into terminal unit detect, when detecting that external connecting function module is linked into terminal unit, signal will be accessed and sent to external connecting function module handler by a GPIO circuit;First adapter 16, for being connected with terminal unit, wherein, the first adapter 16 is provided with the first pin 162 accessing detection and data communication for external connecting function module, and the first pin 162 is connected with the second end of a GPIO circuit 12;
Second control circuit includes:
Second adapter 18, for being connected with the first adapter 16, wherein, the second adapter 18 is provided with the three-prong 182 that the first pin 162 with the first adapter 16 matches;Second detection circuit for access 20, first end and the three-prong 182 of the second detection circuit for access 20 connect, for whether external connecting function module is linked into terminal unit detect, when detecting that external connecting function module is linked into terminal unit, signal will be accessed and send to external connecting function module handler;2nd GPIO circuit 22, the first end and the three-prong 182 of the 2nd GPIO circuit 22 connect, for carrying out data communication with external connecting function module;Terminal unit processor 24, is connected with the second end of the second detection circuit for access 20 and the second end of the 2nd GPIO circuit 22 respectively.
Preferably, in order to make terminal unit to be, external connecting function module is charged, and is also improved the control circuit of above-mentioned external connecting function module, specifically, as it is shown in figure 1, be provided with the second pin 164 for power supply on the first adapter 16;Being provided with the 4th pin 184 for power supply on second adapter 18, the 4th pin 184 matches with the second pin 164;Second control circuit also includes: power module 26, is connected with the 4th pin 184, for external connecting function module for power supply.
One of the present invention preferred embodiment in, the also control circuit to above-mentioned external connecting function module has carried out optimizing further, the access of external connecting function module is determined in the way of realizing by voltage detecting, specifically, as shown in Figure 2, first detection circuit for access includes: detection resistance 28, and detection resistance 28 first end is connected with the 2nd GPIO circuit 22 second end and the first pin 162 respectively, and the second end of detection resistance 28 is connected with earth signal.Second detection circuit for access 20 includes: detection voltage 32;Pull-up resistor 30, the first end of pull-up resistor 30 and three-prong 182 connect, and the second end of pull-up resistor 30 is connected with detection voltage 32;ADC(analog digital conversion) circuit 34, first end of adc circuit 34 is connected with the first end of pull-up resistor 30, second end of adc circuit 34 is connected with terminal unit processor 24, for analog digital conversion, wherein, when external connecting function module is linked into terminal unit, 2nd GPIO circuit is set to high-impedance state by terminal unit processor, detection voltage, pull-up resistor are to adc circuit input voltage signal, after adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close detection voltage, and adc circuit is set to high-impedance state.It should be noted that herein, actual should during, terminal unit processor can include ADC analog-digital conversion function and general input/output port, i.e., above-mentioned adc circuit 34 and above-mentioned 2nd GPIO circuit 22 can be separately provided, it is also possible to be integrated in terminal unit processor realize its function.
During specific works, under system initial state, adc circuit 34 is in running order, 2nd GPIO circuit 22 is set to high-impedance state, detection voltage 32, pull-up resistor 30, the circuit of detection resistance 28 composition detect magnitude of voltage through analog digital conversion to adc circuit 34 output voltage signal, adc circuit 34, and notify to terminal unit processor 24, the signal that terminal unit processor 24 exports according to adc circuit, confirm have external connecting function module to access, so far, it is achieved the access detection of external connecting function module.After the access completing above-mentioned external connecting function module detects, close above-mentioned detection voltage 32, ADC circuit 34 is set to high-impedance state, utilizes the 2nd GPIO circuit 22 of terminal equipment side and a GPIO circuit 12 of external connecting function module side to realize the Communication Control to external terminal module.In addition, also by above-mentioned power module 26, utilize the second pin 164 for power supply arranged on the 4th pin 184 for power supply arranged on terminal equipment side the second adapter 18 and external connecting function module side the first adapter 16, it is achieved the function of supplying power to terminal module.Preferably, if adding function of supplying power can select according to the actual requirements.
When being configured, preferably, detection voltage can be set to 1.8V, pull-up resistor is set to 12K ohm, detection resistance is set to 100K ohm, when external connecting function module accesses, adc circuit detects the voltage input of 1.6V, and notice terminal unit processor is to confirm to have external connecting function module to access.Herein it should be noted that the setting of above-mentioned parameter can be arranged voluntarily according to the performance of external connecting function module and terminal unit, the present invention is not limited to this.
nullCan be seen that from foregoing description,This programme will be used for detecting pin that external connecting function module accesses and the pin being used for carrying out Communication Control with external connecting function module is set to same on local side position,Adapt,For detecting the pin of external connecting function module access and being also configured as same for carrying out the pin of Communication Control with external connecting function module on external connecting function modular connector,When external connecting function module is linked into terminal unit,In advance the 2nd GPIO circuit being used for Control on Communication is set to high-impedance state,By external connecting function module side the first detection circuit for access and terminal equipment side the second detection circuit for access with the use of,The detection of the access to external connecting function module can be realized,Afterwards,Detection function is closed by controlling the second detection circuit for access,Utilize the Communication Control function of a GPIO circuit of external connecting function module side and the 2nd GPIO circuit realiration external connecting function module of terminal equipment side and terminal unit.During stating in realization, only a pin need to be used can to realize access detection and the Communication Control of external connecting function module, when efficiently solving that in prior art, external connecting function module is linked into terminal unit, terminal unit cannot use the problem that a pin realizes accessing detection and Communication Control simultaneously, increase the motility that external connection module accesses, reduce taking of space, further, also improve the utilization rate of resource.
Embodiment 2
Control circuit based on the external connecting function module provided in above-described embodiment 1, provides a kind of external connecting function module in the present embodiment 2, including: external connecting function module handler;Oneth GPIO circuit, first end of the oneth GPIO circuit is connected with external connecting function module handler, oneth GPIO circuit 12 can realize the data communication control of external connecting function module and terminal unit as universal input output, preferably, in actual mechanical process, general input/output port can be comprised, i.e. a GPIO circuit 12 is integrated in external connecting function module handler 10 in external connecting function module handler 10;First detection circuit for access, first end of the first detection circuit for access and the second end of a GPIO circuit connect, for whether external connecting function module is linked into terminal unit detect, when detecting that external connecting function module is linked into terminal unit, signal will be accessed and sent to external connecting function module handler by a GPIO circuit;First adapter, for being connected with terminal unit, wherein, the second end that the first adapter is provided with the first pin accessing detection and data communication for external connecting function module, the first pin and a GPIO circuit connects.
Preferably, in order to make terminal unit to be, external connecting function module is charged, and is also improved above-mentioned external connecting function module, specifically, being provided with the second pin for power supply on first adapter, this pin is by being connected with power pin and power module, it is achieved function of supplying power.
In an optional embodiment of the present invention, additionally provide a kind of first detection circuit for access embodiment, specifically, first detection circuit for access includes: detection resistance, detection resistance the first end is connected with external connecting function module handler and the first pin respectively, and detection resistance the second end is connected with earth signal.
Above-mentioned external connecting function module each several part is corresponding with the first control circuit each several part in the control circuit of the external connecting function module described in embodiment 1, and here is omitted.
Embodiment 3
Control circuit based on the external connecting function module provided in above-described embodiment 1, a kind of terminal unit is provided in the present embodiment 3, including the second adapter, for being connected with external connecting function module, wherein, it is provided with three-prong, for when terminal unit accesses external connecting function module, carrying out access detection and the data communication of external connecting function module on second adapter;Second detection circuit for access, the first end of the second detection circuit for access and three-prong connect, and when detecting that external connecting function module is linked into terminal unit, will access signal and send to external connecting function module handler;2nd GPIO circuit, the first end of the 2nd GPIO circuit and three-prong connect;Terminal unit processor, is connected with the second end of the second detection circuit for access and the second end of the 2nd GPIO circuit respectively.
Additionally providing a kind of second optional embodiment of detection circuit for access in this programme, specifically, the second detection circuit for access includes: detection voltage;Pull-up resistor, the first end of pull-up resistor and three-prong connect, and the second end of pull-up resistor is connected with detection voltage;Adc circuit, first end of adc circuit is connected with the first end of pull-up resistor, second end of adc circuit is connected with terminal unit processor, for analog digital conversion, wherein, when external connecting function module is linked into terminal unit, 2nd GPIO circuit is set to high-impedance state by terminal unit processor, and detection voltage, pull-up resistor are to adc circuit input voltage signal, after adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close detection voltage, and adc circuit is set to high-impedance state.
It should be noted that herein, actual should during, terminal unit processor can include ADC analog-digital conversion function and general input/output port, i.e., above-mentioned adc circuit and above-mentioned 2nd GPIO circuit can be separately provided, it is also possible to be integrated in terminal unit processor realize its function.
Preferably, the second adapter is provided with the 4th pin for power supply;Second control circuit also includes: power module, is connected with the 4th pin.
Above-mentioned external connecting function module each several part is corresponding with the second control circuit each several part in the control circuit of the external connecting function module described in embodiment 1, and here is omitted.
Embodiment 4
Control circuit based on the external connecting function module provided in above-described embodiment 1, a kind of concrete applied environment is provided in the present embodiment 2, as shown in Figure 3, terminal unit is video system, external connecting function module is ATV/DTV adapter, this video system is not by ATV/DTV functional design to the mainboard of video system, but is connected to video system by external adapter and realizes ATV/DTV function.
In figure 3, ATV/DTV signal is through tuner TNER and ATV/DTV processor connecting communication, a GPIO circuit described in embodiment 1 is integrated on ATV/DTV processor (GPIO on ATV/DTV processor in corresponding diagram) by Fig. 3, adc circuit described in embodiment 1 and the 2nd GPIO circuit are integrated on functional chip (ADC and GPIO corresponding respectively on functional chip), control pin (the first pin corresponding in embodiment 1) and power pin (the second pin corresponding in embodiment 1) it is provided with on ATV/DTV adapter coupler, control pin (three-prong corresponding in embodiment 1) and power pin (the 4th pin corresponding in embodiment 1) it is provided with on video system connector.
Specific works process is as follows: the work of the ADC under functional chip under original state, GPIO module is set to high-impedance state, detection voltage, pull-up resistor, detection resistance built-up circuit are to ADC input voltage signal, ADC detection magnitude of voltage, in order to determine the access of ATV/DTV adapter in video system.Afterwards, video system closes the power supply of detection voltage, the ADC of video system is set to high-impedance state, and the GPIO module of video system and the GPIO of ATV/DTV adapter carry out communication and implement to control function, and the equipment that the power module of video system accesses to outside is powered.So far, complete video system the access of ATV/DTV adapter is detected, powered and Communication Control function.Wherein, above-mentioned access detection and Communication Control only need to use to control a pin and can realize.
nullCan be seen that from the above description,This programme will be used for detecting pin that external connecting function module accesses and the pin being used for carrying out Communication Control with external connecting function module is set to same on local side position,Adapt,For detecting the pin of external connecting function module access and being also configured as same for carrying out the pin of Communication Control with external connecting function module on external connecting function modular connector,When external connecting function module is linked into terminal unit,In advance the 2nd GPIO circuit being used for Control on Communication is set to high-impedance state,By external connecting function module side the first detection circuit for access and terminal equipment side the second detection circuit for access with the use of,The detection of the access to external connecting function module can be realized,Afterwards,Detection function is closed by controlling the second detection circuit for access,Utilize the Communication Control function of a GPIO circuit of external connecting function module side and the 2nd GPIO circuit realiration external connecting function module of terminal equipment side and terminal unit.During stating in realization, only a pin need to be used can to realize access detection and the Communication Control of external connecting function module, when efficiently solving that in prior art, external connecting function module is linked into terminal unit, terminal unit cannot use the problem that a pin realizes accessing detection and Communication Control simultaneously, increase the motility that external connection module accesses, reduce taking of space, further, also improve the utilization rate of resource.
The present invention will be described rather than limits the invention to it should be noted above-described embodiment, and those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In the claims, any reference marks that should not will be located between bracket is configured to limitations on claims.Word " comprises " and does not excludes the presence of the element or step not arranged in the claims.Word "a" or "an" before being positioned at element does not excludes the presence of multiple such element.The present invention by means of including the hardware of some different elements and can realize by means of properly programmed computer.If in the unit claim listing equipment for drying, several in these devices can be specifically to be embodied by same hardware branch.Word first, second and third use do not indicate that any order.Can be title by these word explanations.
The application can apply to computer system/server, and it can operate together with other universal or special computing system environment numerous or configuration.The example of well-known calculating system, environment and/or configuration being suitable to be used together with computer system/server includes but not limited to: personal computer system, server computer system, thin client, thick client computer, hand-held or laptop devices, system based on microprocessor, Set Top Box, programmable consumer electronics, NetPC Network PC, minicomputer system large computer system and include the distributed cloud computing technology environment of any of the above described system, etc..
Computer system/server can describe under the general linguistic context of the computer system executable instruction (such as program module) performed by computer system.Generally, program module can include routine, program, target program, assembly, logic, data structure etc., and they perform specific task or realize specific abstract data type.Computer system/server can be implemented in distributed cloud computing environment, and in distributed cloud computing environment, task is to be performed by by the remote processing devices of communication network links.In distributed cloud computing environment, program module may be located at and includes that the Local or Remote of storage device calculates on system storage medium.

Claims (10)

1. the control circuit of an external connecting function module, it is characterised in that including: being arranged on the first control circuit of external connecting function module and be arranged on the second control circuit of terminal unit, wherein, described first control circuit includes:
External connecting function module handler;
Oneth GPIO circuit, the first end of a described GPIO circuit is connected with described external connecting function module handler, for carrying out data communication with described terminal unit;
First detection circuit for access, first end of described first detection circuit for access is connected with described GPIO circuit second end, when detecting that described external connecting function module is linked into described terminal unit, signal will be accessed and sent to described external connecting function module handler by a described GPIO circuit;
First adapter, for being connected with described terminal unit, wherein, described first adapter is provided with the first pin accessing detection and data communication for described external connecting function module, and described first pin is connected with the second end of a described GPIO circuit;
Described second control circuit includes:
Second adapter, for being connected with described first adapter, described second adapter is provided with the three-prong matched with described first pin;
Second detection circuit for access, the first end of described second detection circuit for access is connected with described three-prong, when detecting that described external connecting function module is linked into described terminal unit, will access signal and send to described external connecting function module handler;
2nd GPIO circuit, the first end of described 2nd GPIO circuit is connected with described three-prong, for carrying out data communication with described external connecting function module;
Terminal unit processor, the second end with the second end of described second detection circuit for access and described 2nd GPIO circuit is connected respectively.
2. the control circuit of external connecting function module as claimed in claim 1, it is characterised in that described first detection circuit for access includes:
Detection resistance, described detection resistance the first end is connected with the second end and described first pin of described 2nd GPIO circuit respectively, and described detection resistance the second end is connected with earth signal.
3. the control circuit of external connecting function module as claimed in claim 1, it is characterised in that described second detection circuit for access includes:
Detection voltage;
Pull-up resistor, the first end of described pull-up resistor is connected with described three-prong, and the second end of described pull-up resistor is connected with described detection voltage;
Adc circuit, the first end of described adc circuit is connected with the first end of described pull-up resistor, and the second end of described adc circuit is connected with described terminal unit processor, for analog digital conversion,
Wherein, when described external connecting function module is linked into described terminal unit, described 2nd GPIO circuit is set to high-impedance state by described terminal unit processor, described detection voltage, pull-up resistor are to described adc circuit input voltage signal, after described adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close described detection voltage, and described adc circuit is set to high-impedance state.
4. the control circuit of the external connecting function module as described in any one of claims 1 to 3, it is characterised in that
The second pin for power supply it is provided with on described first adapter;
Being provided with the 4th pin for power supply on described second adapter, described 4th pin matches with described second pin;
Described second control circuit also includes: power module, is connected with described 4th pin, for described external connecting function module for power supply.
5. an external connecting function module, it is characterised in that including:
External connecting function module handler;
Oneth GPIO circuit, the first end of a described GPIO circuit is connected with described external connecting function module handler, for carrying out data communication with terminal unit;
First detection circuit for access, first end of described first detection circuit for access is connected with the second end of a described GPIO circuit, when detecting that external connecting function module is linked into described terminal unit, signal will be accessed and sent to described external connecting function module handler by a described GPIO circuit;
First adapter, for being connected with described terminal unit, wherein, described first adapter is provided with the first pin accessing detection and data communication for described external connecting function module, and described first pin is connected with the second end of a described GPIO circuit.
6. external connecting function module as claimed in claim 5, it is characterised in that described first detection circuit for access includes:
Detection resistance, described detection resistance the first end is connected with described external connecting function module handler and described first pin respectively, and described detection resistance the second end is connected with earth signal.
7. the external connecting function module as described in claim 5 or 6, it is characterised in that be provided with the second pin for power supply on described first adapter.
8. a terminal unit, it is characterised in that including:
Second adapter, for being connected with external connecting function module, wherein, described second adapter is provided with three-prong, for when terminal unit accesses external connecting function module, carrying out access detection and the data communication of described external connecting function module;
Second detection circuit for access, the first end of described second detection circuit for access is connected with described three-prong, when detecting that described external connecting function module is linked into described terminal unit, will access signal and send to described external connecting function module handler;
2nd GPIO circuit, the first end of described 2nd GPIO circuit is connected with described three-prong, for carrying out data communication with described external connecting function module;
Terminal unit processor, the second end with the second end of described second detection circuit for access and described 2nd GPIO circuit is connected respectively.
9. terminal unit as claimed in claim 8, it is characterised in that described second detection circuit for access includes:
Detection voltage;
Pull-up resistor, the first end of described pull-up resistor is connected with described three-prong, and the second end of described pull-up resistor is connected with detection voltage;
Adc circuit, the first end of described adc circuit is connected with the first end of described pull-up resistor, and the second end of described adc circuit is connected with described terminal unit processor, for analog digital conversion,
Wherein, when described external connecting function module is linked into described terminal unit, described 2nd GPIO circuit is set to high-impedance state by described terminal unit processor, described detection voltage, pull-up resistor are to described adc circuit input voltage signal, after described adc circuit meets predetermined voltage threshold by the magnitude of voltage obtained after analog digital conversion, close described detection voltage, and described adc circuit is set to high-impedance state.
10. terminal unit as claimed in claim 8 or 9, it is characterised in that
The 4th pin for power supply it is provided with on described second adapter;
Described second control circuit also includes: power module, is connected with described 4th pin, for described external connecting function module for power supply.
CN201510183227.9A 2015-04-17 2015-04-17 Control circuit of external functional module, external functional module and terminal device Pending CN105893301A (en)

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US20070168574A1 (en) * 2005-09-28 2007-07-19 Dell Products L.P. System and method for securing access to general purpose input/output ports in a computer system
CN201590889U (en) * 2009-12-25 2010-09-22 歌尔声学股份有限公司 Stereosonic bluetooth headset
CN102087624A (en) * 2009-12-02 2011-06-08 上海摩波彼克半导体有限公司 Circuit structure and method for realizing USB interface functional verification test on the basis of FPGA module
CN103856411A (en) * 2012-12-03 2014-06-11 上海斐讯数据通信技术有限公司 Switching system connected with UART interface of router

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070168574A1 (en) * 2005-09-28 2007-07-19 Dell Products L.P. System and method for securing access to general purpose input/output ports in a computer system
CN102087624A (en) * 2009-12-02 2011-06-08 上海摩波彼克半导体有限公司 Circuit structure and method for realizing USB interface functional verification test on the basis of FPGA module
CN201590889U (en) * 2009-12-25 2010-09-22 歌尔声学股份有限公司 Stereosonic bluetooth headset
CN103856411A (en) * 2012-12-03 2014-06-11 上海斐讯数据通信技术有限公司 Switching system connected with UART interface of router

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