CN108664365A - The detection method of the external accessory of a kind of electronic equipment - Google Patents
The detection method of the external accessory of a kind of electronic equipment Download PDFInfo
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- CN108664365A CN108664365A CN201710186170.7A CN201710186170A CN108664365A CN 108664365 A CN108664365 A CN 108664365A CN 201710186170 A CN201710186170 A CN 201710186170A CN 108664365 A CN108664365 A CN 108664365A
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- accessory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/26—Functional testing
- G06F11/273—Tester hardware, i.e. output processing circuits
- G06F11/2733—Test interface between tester and unit under test
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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Abstract
The invention discloses the external accessory detection method of a kind of electronic equipment, especially a kind of detection method of the external accessory of low-power consumption internet of things equipment.By being multiplexed I2C interface reduces required connecting line quantity with GPIO interface.At least one master chip of electronic equipment host and two weak pull-down resistance being connected with master chip;At least containing there are one controllers and one can be operated in I in the master chip2The interface that C mode and GPIO patterns mutually switch, wherein controller are used to detect the access state of interface, and the specific works pattern of interface is arranged according to system requirements.After controller completes access differentiation, it can further pass through I2C mode reads the information in external accessory.The detection method that the present invention illustrates reduces connecting line quantity by interface duplex, and under the premise of not influencing original function, further holding equipment host is to accessing the automatic decision of accessory type and to the information collection and control of accessory.
Description
Technical field
The invention belongs to the detection circuit field of electronic equipment, more particularly to low-power consumption Internet of Things electronic equipment is external attached
The detection method of accessory.
Background technology
Higher and higher in the rapid development of electronic technology, master chip integrated level, the function of electronic equipment is more and more multiple
It is miscellaneous.But often different electronic device body hardware designs are identical, and the sensing in the external accessory of electronic equipment
Device, executing agency difference.In order to enable electronic equipment can actively detect external accessory it is reliable insertion and
It removes and reads which kind of accessory external accessory is, and then carry out corresponding digital independent and control to seem particularly
It is important.Can at this time exist between electronic device body and external accessory a large amount of signal wire for be inserted into detect, attachment
Identification and signal control, how under the premise of meeting functional requirement, and reduce to the greatest extent electronic product body and accessory it
Between connecting line become an important project.
In the prior art, a kind of recognition methods for peripheral hardware is by product host software timed periodic (example
Such as 100 milliseconds) inquired by I2C buses, if there is accessory is inserted into, then can read setting in accessory
Standby information, the I2C read errors if accessory removes indicate that equipment is removed.The disadvantage of this pattern maximum is exactly
The controller of host is constantly in periodic operating mode, and energy consumption greatly increases, and for LoRa, NB-IoT etc. is battery powered
It is unacceptable for low-power consumption Internet of Things electronic equipment.
In the prior art, a kind of recognition methods for peripheral hardware is utilized by one or more GPIO interface
Corresponding GPIO pull-up or the pattern of pull down resistor are identified on accessory.The pattern have it is simple in structure, it is at low cost
Honest and clean feature.It is simple accessories in accessory, under the premise of type is less, such as the moulds such as LED light, a buzzer
It is effective under formula.When accessory is all kinds of sophisticated sensors, accessory is needed to provide sensor type, sequence number, school
Under the complex environments such as quasi- parameter, the pattern of the upper pull down resistors of GPIO cannot provide enough information, and simple GPIO patterns
It is easy to be interfered the false judgment for leading to electronic equipment host by factors such as contact contamination, human body touchings.
In existing technology, a kind of recognition methods for peripheral hardware is simply by being pulled down on I2C buses and GPIO
The composite mode of resistance carries out the detection of accessory.This method effectively prevents the drawbacks of above two method, but simple
Superposition so that connecting line quantity between electronic product body and accessory greatly increases, not only increase the complexity of product
Degree, cost, also influence the appearance of external equipment.The master chip of consumption inherently more valuable pin money simultaneously
Source.
Invention content
The technical problem to be solved by the present invention is in order to overcome electronic product equipment in the prior art and accessory to detect
With the various problems in identification, make full use of novel master chip external pin can with flexible configuration various operating modes spy
Point is multiplexed GPIO and I2The pin of C buses, only increase by 2 weak pull-down resistance can be completed accessory be inserted into, remove it is reliable
Detection, and further support main electronic product body to the automatic decision of accessory type and the number to accessing accessory
According to reading or control.
Description of the drawings
Fig. 1 is a kind of detection circuit schematic diagram provided in an embodiment of the present invention.
Fig. 2 be it is provided in an embodiment of the present invention, it is a kind of more excellent when master chip itself does not support GPIO/I2C mode multiplexings
Detection circuit schematic diagram.
Specific implementation mode
The present invention is to solve above-mentioned technical problem by following technical proposals, is hereinafter described by taking Fig. 1 as an example
It is described in detail.
The detection method of the external accessory of a kind of electronic equipment, which is characterized in that including：Electronic equipment host (1) passes through
External accessory (2), the I in electronic equipment host (1) are connected to by aerial lug (spring thimble etc.) (3)2C and GPIO
Output reduces thimble quantity needed for aerial lug (3) to aerial lug (3) after matched circuit is compound；Electronic equipment
Host (1) can the external accessory of automatic decision (2) whether connect system, external accessory can be further read after connection
(2) facility information in, electronic equipment host (1) with external accessory (2) after connecting in I2The not busy gap of C communications can pass through
GPIO port keeps monitoring whether external accessory keeps connecting.
The detection method, being effectively utilized master chip interface (6) can configure as needed in different working modes, knot
It closes and utilizes I2C buses itself work required pull-up resistor R3 (13), and R4 (14) is used as detection means, using I2C buses itself
Signal wire SDA (7) and SCL (8), do not increasing additional detections connecting line, do not influencing I2Itself reliable communicating of C buses, passes through
Only increase by 2 weak pull-down resistance R1 (11), R2 (12) completes the reliable detection of external attached device (2).
The detection method, when external accessory (2) is not connected to electronic device host (1), CPU controls
Device (5) it is default interface circuit (6) configure the operating mode that is inputted in GPIO high impedances, signal wire SDA (7) and SCL (8) via
Weak pull-down resistance R1 (11) and R2 (12) are connected in power ground, and SDA (7) and SCL (8) is low level, cpu controller at this time
(5) it is judged as that no attachment is connected to electronic device host (1), complete machine is in a dormant state.
The detection method, when external accessory (2) is connected to electronic device host (1), signal wire SDA
(7) it is connected on power supply VCC via strong pull-up resistance R3 (13) and R4 (14) with SCL (8).Cpu controller (5), which detects, at this time connects
The rising edge signal that mouth circuit (6) transmits enters level detection state, is all high level when reading SDA (7) and SCL (8)
When, then judge there is external accessory (2) access.Then interface circuit (6) is configured to I by cpu controller (5)2The Working mould of C
Formula, and pass through I2C agreements read the specific facility information of EEPROM (9) in external accessory (2) and can execute as needed
Other relevant operations.All I2After C end of operation, interface circuit (6) is reconfigured back to the work of GPIO by cpu controller (5)
Pattern, the high level of SDA (7) and SCL (8) holdings at this time.
The detection method, when external accessory (2) is connected correctly to electronic device host (1), SDA (7)
It is always maintained at high level state with SCL (8), when external force removes external accessory (2), signal wire SDA (7) and SCL
(8) lose external strong pull-up resistance R3 (13) and R4 (14), by electronic device host (1) weak pull-down resistance R1 (11) and
R2 (12) moves low level to again.Cpu controller (5) receives the failing edge signal that interface circuit (6) transmits and enters level inspection
Survey state then judges that external accessory (2) is removed when reading SDA (7) and SCL (8) is low level.
The detection method, signal wire SDA (7) and SCL (8) are connected to weak pull-down resistance R1 (11) and R2 simultaneously in host
(12), strong pull-up resistance R3 (13) and R4 (14) are connected in accessory.When being inserted into and removing judgement, CPU
Controller (5) while the state for reading SDA (7) and SCL (8) is judged greatly reduces external interference and human body touch
False triggering.
The detection method, when external attached accessory (2) does not access, weak pull-down resistance R1 (11) and R2 (12)
Resistance value is chosen very big (such as 20M ohm), while interface circuit (6) configures the operating mode inputted in GPIO high impedances, has
The electric leakage of reduction system is imitated, battery working time when electronic equipment is not inserted into attachment is extended.
More preferably, the connection method, in the I2C buses continue with I after completing attachment detection2C buses are to accessory
Interior sensor/other peripheral hardwares (10) carry out digital independent or control.
More preferably, when certain master chips can not simply switch I2It, can be with when C operating modes and GPIO operating modes
Two GPIO pins are directly connected on I2On the pin of C, connection method figure is shown in 2, can play the identical effect of the present invention.
The detection method of the external accessory of electronic equipment of the present invention is more simple, at least in electronic equipment host
As long as the reliable insertion of equipment can be completed with 4 pins of external accessory, remove detection；Accessory type specifying information
Identification and digital independent or the control of accessory.Meeting the function of same electronic equipment host difference accessory needs
It asks, enormously simplifies external interface.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention has appended claims limited.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, change or modification can be made to embodiment of above, but these changes and
Modification falls within protection scope of the present invention.
Claims (9)
1. the detection method of the external accessory of a kind of electronic equipment, including electronic equipment host（1）Via aerial lug（Bullet
Spring thimble etc.）（3）It is connected to external accessory（2）, electronic equipment host（1）Interior I2The matched circuits of C and GPIO are compound
After export to aerial lug（3）, reduce aerial lug（3）Required thimble quantity；Electronic equipment host（1）It can sentence automatically
Break external accessory（2）Whether system in connection, external accessory can be further read after connection（2）Interior equipment letter
Breath, electronic equipment host（1）With external accessory（2）In I after connection2The not busy gap of C communications can be kept supervising by GPIO port
Survey whether external accessory keeps connecting.
2. detection method according to claim 1, which is characterized in that be effectively utilized master chip interface（6）It can basis
It needs to configure in different working modes, is combined I2C buses itself work required strong pull-up resistance R3, and R4 is as detection
Means, using I2The signal wire SDA of C buses itself（6）With SCL（7）, do not increasing additional detections connecting line, do not influencing I2C is total
Line itself reliable communicating completes external attached device by only increasing by 2 weak pull-down resistance R1, R2（2）Reliable detection.
3. detection method according to claim 1, which is characterized in that in external accessory（2）It is not connected to electronics
Device host（1）When, cpu controller（5）It is default interface circuit (6) to be configured the Working mould inputted in GPIO high impedances
Formula, signal wire SDA（6）It is connected in power ground via weak pull-down resistance R1 and R2 with SCL (7), SDA (6) and SCL (7) is equal at this time
It is low level, cpu controller is judged as that no attachment is connected to electronic device host（1）, complete machine is in a dormant state.
4. detection method according to claim 1, which is characterized in that in external accessory（2）It is connected to electronic device
Host（1）When, signal wire SDA（6）It is connected on power supply VCC via strong pull-up resistance R3 and R4 with SCL (7)；CPU is controlled at this time
Device processed（5）Detect that the rising edge signal that interface circuit (6) transmits enters level detection state, when reading SDA（6）With
When being all high level in SCL (7), then judge there is external accessory（2）Access；Then cpu controller（5）By interface circuit
(6) it is configured to I2The operating mode of C, and pass through I2C agreements read external accessory（2）Middle EEPROM（9）Specific equipment letter
It ceases and other relevant operations can be executed as needed；All I2After C end of operation, cpu controller（5）By interface circuit (6) weight
Newly match the operating mode for putting back into GPIO, at this time SDA（6）High level is kept with SCL (7).
5. detection method according to claim 1, which is characterized in that in external accessory（2）It is connected correctly to electronics
Device host（1）When, SDA（6）It is always maintained at high level state with SCL (7), when external force removes external accessory（2）
When, signal wire SDA（6）External strong pull-up resistance R3 and R4 are lost with SCL (7), by electronic device host（1）Interior is weak
Pull down resistor R1 and R2 move low level to again；Cpu controller（5）The failing edge signal that interface circuit (6) transmits is received to enter
To level detection state, when reading SDA（6）When being low level with SCL (7), then external accessory is judged（2）It has moved
It removes.
6. detection method according to claim 1, which is characterized in that signal wire SDA（6）With SCL (7) in host simultaneously
It is connected to weak pull-down resistance R1 and R2, strong pull-up resistance R3 and R4 are connected in accessory；It is being inserted into and is being removed judgement
When, cpu controller（5）Read SDA simultaneously（6）Judged with the state of SCL (7), greatly reduces external interference and people
The false triggering that body touches.
7. detection method according to claim 1, which is characterized in that when external attached accessory（2）When access,
Weak pull-down resistance R1 and R2 resistance value is chosen very big（Such as 20M ohm）, while interface circuit (6) configuration is defeated in GPIO high impedances
The operating mode entered effectively reduces the electric leakage of system, extends battery working time when electronic equipment is not inserted into attachment.
8. more preferably, detection method according to claim 1, in the I2C buses continue with I after completing attachment detection2C
Bus is to the sensor in accessory/other electronic devices（10）Carry out digital independent.
9. more preferably, detection method according to claim 1, when certain master chips can not simply switch I2C operating modes
When with GPIO operating modes, two GPIO pins can be directly connected on I2On the pin of C, connection method Fig. 2, Ke Yiqi
To the identical effect of the present invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186170.7A CN108664365A (en) | 2017-03-27 | 2017-03-27 | The detection method of the external accessory of a kind of electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710186170.7A CN108664365A (en) | 2017-03-27 | 2017-03-27 | The detection method of the external accessory of a kind of electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN108664365A true CN108664365A (en) | 2018-10-16 |
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ID=63785391
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710186170.7A Pending CN108664365A (en) | 2017-03-27 | 2017-03-27 | The detection method of the external accessory of a kind of electronic equipment |
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| CN (1) | CN108664365A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988746A (en) * | 2019-12-11 | 2020-04-10 | 昆山丘钛微电子科技有限公司 | Module connection state detection device and method |
| CN112667548A (en) * | 2020-12-25 | 2021-04-16 | 海宁奕斯伟集成电路设计有限公司 | Communication interface, device and method for supporting bidirectional two-wire system synchronous serial bus |
| CN113641611A (en) * | 2021-06-30 | 2021-11-12 | 荣耀终端有限公司 | I2C interface circuit, control method thereof and electronic equipment |
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| CN101329663A (en) * | 2008-07-31 | 2008-12-24 | 炬力集成电路设计有限公司 | Apparatus and method for implementing pin time-sharing multiplexing |
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Cited By (4)
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Application publication date: 20181016 |