CN109800198A - A kind of USB port connects three equipment and realizes the autonomous switching circuits of hardware - Google Patents
A kind of USB port connects three equipment and realizes the autonomous switching circuits of hardware Download PDFInfo
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- CN109800198A CN109800198A CN201910044735.7A CN201910044735A CN109800198A CN 109800198 A CN109800198 A CN 109800198A CN 201910044735 A CN201910044735 A CN 201910044735A CN 109800198 A CN109800198 A CN 109800198A
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- vbus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
Three equipment are connect the present invention provides a kind of USB port and realize the autonomous switching circuit of hardware, and default conditions confirmation: in usb protocol, USB does main equipment, and ID is necessary for low, and supplying power for outside；When doing from equipment, ID is hanging or high level, is powered by main equipment；PC usually only does at end main equipment, and VBUS 5V, ID are hanging or are high level；USB flash disk, it usually needs OTG line is connected with other equipment, ID be it is low, VBUS is hanging；When default conditions, COMA does not connect USB flash disk and PC, and the ID1 of COMA is high level by internal system 5V pull-up, VBUS is low level by internal system drop-down, ID and VBUS makes the ID2 low level of system CPU by logical AND gate, while the VBUS of COMA makes USB switch remain to COMB, connects B device；It realizes and is communicated with B device；The VBUS continued power of B device, ID be it is hanging, realize autonomous master-slave swap, realize time-sharing communication from one main equipment of equipment with two.
Description
Technical field
The present invention relates to Design of Digital Circuit field and automation control areas, and in particular to a kind of USB port connects three and sets
It is standby to realize the autonomous switching circuit of hardware.
Background technique
Existing USB technology is very mature, and USB port expansion technique is also mature, but the interface expanded is typically only capable to do
Main equipment cannot be done from equipment.A kind of situation as such:
(1) only one USB OTG interface, it is desirable that connect on computers, do from equipment；
(2) connecting USB flash disk can communicate with USB flash disk, do main equipment；(USB flash disk and computer are same interface, are named as COMA)；
(3) it in USB flash disk of getting along well, computer connection, needs to communicate with B device, does main equipment；
(4) when connecting with computer, USB flash disk, B device, communication object can only be automatically switched by hardware.
Summary of the invention
In order to solve above-mentioned insufficient defect, three equipment are connect the present invention provides a kind of USB port and realize that hardware is independently cut
Change circuit, the main purpose of invention solves in embedded system, a USB interface by hardware automatic switchover master slave mode and
Change communication object；That is USB interface realizes autonomous master-slave swap by hardware logic electric circuit, with two from setting
A standby main equipment realizes time-sharing communication.
Three equipment, which are connect, the present invention provides a kind of USB port realizes the autonomous switching circuit of hardware, default conditions confirmation:
In usb protocol, USB does main equipment, and ID is necessary for low, and supplying power for outside；When doing from equipment, ID is hanging or high level, You Zhushe
Available electricity；PC usually only does at end main equipment, and VBUS 5V, ID are hanging or are high level；USB flash disk, it usually needs OTG line is set with other
It is standby to be connected, ID be it is low, VBUS is hanging；When default conditions, COMA does not connect USB flash disk and PC, and the ID1 of COMA is pulled up by internal system 5V
For high level, VBUS is made the low electricity of ID2 of system CPU by internal system drop-down for low level, ID and VBUS by logical AND gate
It is flat, while the VBUS of COMA makes USB switch remain to COMB, connects B device；It realizes and is communicated with B device；The VBUS of B device continues
Power supply, ID is hanging.
Above-mentioned circuit, wherein when connecing the end PC, the ID1 and VBUS of COMA are high level, it two is determined by logical AND gate
The ID2 for determining system CPU is high level, and CPU is done from equipment, while the VBUS of COMA makes USB switching to COMA；Realization system
CPU and PC is independently communicated.
Above-mentioned circuit, wherein when connecing USB flash disk, it is low level that the ID1 of COMA is drawn by OTG line, while ID1 loads USB
Switch is opened, and system is USB flash disk power supply, and the VBUS of COMA is high level therewith, and the ID1 and VBUS of COMA is made by logical AND gate
The ID2 of CPU is low level, and CPU does main equipment, and at this moment the VBUS of COMA makes USB switching to COMA；Realize system CPU master
From identity switching and USB flash disk communication.
Three equipment, which are connect, the present invention provides a kind of USB port realizes that the autonomous switching circuit of hardware has the advantages that
One USB interface automatically switches master slave mode and change communication object by hardware；That is a USB interface passes through hard
Part logic circuit realizes autonomous master-slave swap, realizes time-sharing communication from one main equipment of equipment with two.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent upon.Identical label indicates identical part in all the attached drawings.Not deliberately proportionally
Draw attached drawing, it is preferred that emphasis is show the gist of the present invention.
Fig. 1 is default conditions schematic diagram of the invention.
Fig. 2 connects the end PC working condition schematic diagram for of the invention.
Fig. 3 is the schematic diagram for connecing USB flash disk working condition of the invention.
Fig. 4 is the whole circuit diagram of the present invention.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Illustrate technical solution of the present invention.Presently preferred embodiments of the present invention is described in detail as follows, however other than these detailed descriptions, this
Invention can also have other embodiments.
Referring to Fig.1 shown in-Fig. 4, a kind of USB port provided by the invention connects three equipment and realizes the autonomous switching circuits of hardware,
Default conditions confirmation: in usb protocol, USB does main equipment, and ID is necessary for low, and supplying power for outside；When doing from equipment, ID is hanging
Or high level, it is powered by main equipment；PC usually only does at end main equipment, and VBUS 5V, ID are hanging or are high level；USB flash disk usually needs
Want OTG line to be connected with other equipment, ID be it is low, VBUS is hanging；When default conditions, COMA does not meet USB flash disk and PC, the ID1 of COMA
Be high level by internal system 5V pull-up, VBUS is low level by internal system drop-down, ID and VBUS made by logical AND gate be
The ID2 of system CPU is low level, while the VBUS of COMA makes USB switch remain to COMB, connects B device；It realizes and is communicated with B device；
The VBUS continued power of B device, ID be it is hanging, when connecing the end PC, the ID1 and VBUS of COMA are high level, it two passes through logic
ID2 with door decision systems CPU is high level, and CPU is done from equipment, while the VBUS of COMA makes USB switching to COMA；It is real
Existing system CPU is independently communicated with PC, and when connecing USB flash disk, it is low level that the ID1 of COMA is drawn by OTG line, while ID1 opens USB load
It closes and opens, system is USB flash disk power supply, and the VBUS of COMA is high level therewith, and the ID1 and VBUS of COMA makes CPU by logical AND gate
ID2 be low level, CPU does main equipment, and at this moment the VBUS of COMA makes USB switching to COMA；Realize system CPU principal and subordinate body
Part switching and USB flash disk communication.
A specific embodiment presented below
Embodiment 1, referring to Fig.1 shown in-Fig. 4, in the present invention, default conditions confirmation:
In usb protocol, USB does main equipment, and ID is necessary for low, and supplying power for outside.When doing from equipment, ID is hanging or high electricity
It is flat, it is powered by main equipment；
PC usually only does at end main equipment, and VBUS 5V, ID are hanging or are high level；
USB flash disk, it usually needs OTG line is connected with other equipment, ID be it is low, VBUS is hanging.
When default conditions, COMA does not connect USB flash disk and PC, and the ID1 of COMA is high level by internal system 5V pull-up, and VBUS is by being
The internal drop-down of system makes the ID2 low level of system CPU, while the VBUS of COMA for low level, ID and VBUS by logical AND gate
So that USB switch is remained to COMB, connects B device.It realizes and is communicated with B device.The VBUS continued power of B device, ID are hanging.
When connecing the end PC, the ID1 and VBUS of COMA are high level (computer decisions), it two passes through logical AND gate decision systems
The ID2 of CPU is high level, and CPU is done from equipment, while the VBUS of COMA makes USB switching to COMA；Realize system CPU with
PC is independently communicated；
When connecing USB flash disk, it is low level that the ID1 of COMA is drawn by OTG line, while ID1 opens USB load switch, system U
Disk power supply, the VBUS of COMA is high level therewith, and the ID1 and VBUS of COMA make the ID2 low level of CPU by logical AND gate,
CPU does main equipment, and at this moment the VBUS of COMA makes USB switching to COMA；Realize that the switching of system CPU principal and subordinate identity and USB flash disk are logical
News.The present invention can be realized a USB interface by hardware logic electric circuit, realize autonomous master-slave swap, with two from equipment one
A main equipment realizes time-sharing communication；Such as: products application is on high accuracy positioning navigation neceiver, specific embodiment: one
In a embedded system, CPU has a USB interface, can decide or from equipment.One logical AND gate SN74LVC1G08DVBT；
One USB switch FSUSB42MUX；One load switch RT9706；The mode of connection is as shown in schematic diagram, as shown in Figure 4.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this is not affected the essence of the present invention.Therefore, anything that does not depart from the technical scheme of the invention, foundation
Technical spirit of the invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within the present invention
In the range of technical solution protection.
Claims (3)
1. a kind of USB port connects three equipment and realizes the autonomous switching circuit of hardware, which is characterized in that default conditions confirmation: being assisted in USB
In view, USB does main equipment, and ID is necessary for low, and supplying power for outside；When doing from equipment, ID is hanging or high level, is supplied by main equipment
Electricity；PC usually only does at end main equipment, and VBUS 5V, ID are hanging or are high level；USB flash disk, it usually needs OTG line and other equipment phase
Even, ID is low, and VBUS is hanging；When default conditions, COMA does not connect USB flash disk and PC, and the ID1 of COMA is height by internal system 5V pull-up
Level, VBUS are made the ID2 low level of system CPU by internal system drop-down for low level, ID and VBUS by logical AND gate, together
When COMA VBUS make USB switch remain to COMB, connect B device；It realizes and is communicated with B device；The VBUS continued power of B device,
ID is hanging.
2. a kind of USB port as described in claim 1 connects three equipment and realizes the autonomous switching circuit of hardware, which is characterized in that when
When connecing the end PC, the ID1 and VBUS of COMA is high level, its two ID2 for passing through logical AND gate decision systems CPU is high level, CPU
It does from equipment, while the VBUS of COMA makes USB switching to COMA；Realize that system CPU is independently communicated with PC.
3. a kind of USB port as claimed in claim 2 connects three equipment and realizes the autonomous switching circuit of hardware, which is characterized in that when
When connecing USB flash disk, it is low level that the ID1 of COMA is drawn by OTG line, while ID1 opens USB load switch, and system is USB flash disk power supply, with
The VBUS of COMA be high level, the ID1 and VBUS of COMA make the ID2 low level of CPU by logical AND gate, and CPU, which decides, to be set
Standby, at this moment the VBUS of COMA makes USB switching to COMA；Realize the switching of system CPU principal and subordinate identity and USB flash disk communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910044735.7A CN109800198B (en) | 2019-01-17 | 2019-01-17 | Circuit for realizing independent switching of hardware by connecting three devices through USB (universal serial bus) ports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910044735.7A CN109800198B (en) | 2019-01-17 | 2019-01-17 | Circuit for realizing independent switching of hardware by connecting three devices through USB (universal serial bus) ports |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109800198A true CN109800198A (en) | 2019-05-24 |
| CN109800198B CN109800198B (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910044735.7A Active CN109800198B (en) | 2019-01-17 | 2019-01-17 | Circuit for realizing independent switching of hardware by connecting three devices through USB (universal serial bus) ports |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110569208A (en) * | 2019-08-02 | 2019-12-13 | 武汉精立电子技术有限公司 | Control circuit, signal control device, signal control method and system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102991538A (en) * | 2012-12-26 | 2013-03-27 | 北京科信华技术有限公司 | Device and method for automatically switching point-to-point communication |
| CN105824771A (en) * | 2015-10-28 | 2016-08-03 | 维沃移动通信有限公司 | Electronic device and master-slave switching method and apparatus thereof |
| US20160232122A1 (en) * | 2013-10-22 | 2016-08-11 | Allgo Embedded Systems Private Limited | Universal serial bus (usb) hub for switching downstream ports between host mode and slave mode |
| US20170039155A1 (en) * | 2015-08-07 | 2017-02-09 | Xiaomi Inc. | Interface circuit, method and device for state switching |
| CN107977331A (en) * | 2016-10-25 | 2018-05-01 | 中兴通讯股份有限公司 | A kind of control method, device and terminal |
| CN108021522A (en) * | 2017-12-14 | 2018-05-11 | 威创集团股份有限公司 | USB device master slave mode switching circuit |
-
2019
- 2019-01-17 CN CN201910044735.7A patent/CN109800198B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102991538A (en) * | 2012-12-26 | 2013-03-27 | 北京科信华技术有限公司 | Device and method for automatically switching point-to-point communication |
| US20160232122A1 (en) * | 2013-10-22 | 2016-08-11 | Allgo Embedded Systems Private Limited | Universal serial bus (usb) hub for switching downstream ports between host mode and slave mode |
| US20170039155A1 (en) * | 2015-08-07 | 2017-02-09 | Xiaomi Inc. | Interface circuit, method and device for state switching |
| CN105824771A (en) * | 2015-10-28 | 2016-08-03 | 维沃移动通信有限公司 | Electronic device and master-slave switching method and apparatus thereof |
| CN107977331A (en) * | 2016-10-25 | 2018-05-01 | 中兴通讯股份有限公司 | A kind of control method, device and terminal |
| CN108021522A (en) * | 2017-12-14 | 2018-05-11 | 威创集团股份有限公司 | USB device master slave mode switching circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110569208A (en) * | 2019-08-02 | 2019-12-13 | 武汉精立电子技术有限公司 | Control circuit, signal control device, signal control method and system |
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| CN109800198B (en) | 2023-05-09 |
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