CN101944074A - Method and device for realizing OTG based on USB socket - Google Patents
Method and device for realizing OTG based on USB socket Download PDFInfo
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- CN101944074A CN101944074A CN2010102256936A CN201010225693A CN101944074A CN 101944074 A CN101944074 A CN 101944074A CN 2010102256936 A CN2010102256936 A CN 2010102256936A CN 201010225693 A CN201010225693 A CN 201010225693A CN 101944074 A CN101944074 A CN 101944074A
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Abstract
The invention discloses a method and a device for realizing OTG based on a UBS socket. The device comprises a first channel, an overvoltage detection circuit, a second channel, an automatic master-slave switching circuit and a slave state holding circuit, wherein the first channel is used for supplying electricity to external equipment; the overvoltage detection circuit is used for detecting the voltage state on the channel of the external equipment; the second channel is used for controlling state switching according to a received detection result sent by the overvoltage detection circuit and outputting corresponding signals to a processor; the automatic master-slave switching circuit controls the processor which is connected with the automatic master-slave switching circuit to switch to the slave state according to the slave state signal, and cuts off the first channel for supplying the electricity to the external equipment through the processor, or controls the processor which is connected with the automatic master-slave switching circuit to switch to the master state according to the master state signal; and the slave state holding circuit enables the second channel to keep on state according to the slave state signal of the processor. By successfully adopting effective combination of a passive device and a voltage standard, the method and the device realize the automatic switching of an ID state and effectively avoid the phenomenon that similar states collide.
Description
Technical field
The present invention relates to technology based on Universal USB (Universal Serial Bus, USB (universal serial bus)) socket, particularly a kind of based on the Universal USB socket and realized the method and apparatus of OTG (On The Go) function.
Background technology
When safeguarding wireless communication base station system, need to extract a large amount of on-the-spot warning information to analyze and fault location.Usually, a large amount of alarms all is to complain to BSC (Base Station Controller, base station controller) on the computer of backstage, but it is unusual if transmission link occurs, cause BSC and BTS (Base Transceiver Station, base transceiver station) do not communicate by letter, then be difficult to obtain again on-the-spot warning information.Therefore, on the main control equipment of BTS, mutual just highly significant with a Universal USB interface and peripherals: when transmission was broken down, the maintainer can be with a flash disk to the on-the-spot warning information that extracts in base station, this moment, the USB module was under the major state; In addition, can also carry out the diagnosis of some necessity with computer by this USB interface, this moment, the USB module was under state.In this case, major state and all need the Universal USB interface to realize from state, and need to realize the automatic switchover of master slave mode.At present, realize that OTG often needs to use MINI 5pinUSB socket to realize, switch because an additional pin can be used for state, but incompatible common peripheral devices such as flash disk and notebook computer etc.
In the prior art, have the USB OTG interface that carries out principal and subordinate's decision circuitry automatically and need sampling thief, amplifier, the complicated circuit that device such as comparer and attenuation network constitutes, realization detects master slave mode by the flow direction that detects electric current, as shown in Figure 1, this circuit comprises a current signal amplifier and a comparer, by detecting the electric current flow state of USB interface, to reach the purpose of differentiating USB device principal and subordinate end, but when two notebook computers link to each other by USB interface, both sides all are the USB major state, then can not set up communication link, the processing of the abnormal conditions such as conflict when not having realization that similar state is linked to each other, and circuit is realized complicated, and cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of device, be used to solve the problem of similar state conflict, and circuit realizes that simply cost is lower based on Universal USB socket realization OTG.
Another object of the present invention is to provide a kind of method, be used to solve the problem of similar state conflict, and circuit realizes that simply cost is lower based on Universal USB socket realization OTG.
According to an aspect of the present invention, provide a kind of device, having comprised based on Universal USB socket realization OTG:
First passage is used for outside attached device power supply;
Over-voltage detection circuit is used to detect the voltage status on the outer attached device path;
Second channel, be used in the testing result of receiving the overvoltage that over-voltage detection circuit sends, be converted into conducting state, and to processor output from status signal, perhaps in the testing result of receiving the non-overvoltage that over-voltage detection circuit sends, be converted into off-state, and to processor output major state signal;
Principal and subordinate's automatic switch-over circuit according to from status signal, is controlled coupled processor and is converted to from state, and by the first passage that processor cuts off external attached device power supply, perhaps according to the major state signal, controls coupled processor and be converted to major state;
From state retaining circuit, according to processor from status signal, make second channel keep conducting state.
Wherein, over-voltage detection circuit is first resistance and voltage reference device series circuit or first resistance and over-voltage clamping diode series circuit, be connected between second channel input end and the ground wire, its voltage reference device or over-voltage clamping diode two ends connect the control end and the ground wire of second channel respectively.
Second channel is made of thyristor, and its source electrode is for connecting the second channel input end of outer attached device, and its drain electrode is for connecting the second channel output terminal of principal and subordinate's automatic switch-over circuit, and its gate pole is the control end of second channel.
Principal and subordinate's automatic switch-over circuit is first transistor switching circuit, and its base stage is connected with the output terminal of second channel by second resistance, and its emitter directly is connected via the 3rd resistance eutral grounding and with processor.
From state retaining circuit is second transistor switching circuit, and its base stage is connected with processor via the 4th resistance eutral grounding and via the 5th resistance, the direct ground connection of its emitter, and its collector is connected with the control end of second channel.
According to a further aspect in the invention, provide a kind of method, may further comprise the steps based on Universal USB socket realization OTG:
After outer attached device was inserted USB socket, over-voltage detection circuit detected the voltage status of outer attached device;
If testing result is overvoltage, then the conducting second channel makes its output from status signal, makes principal and subordinate's automatic switch-over circuit basis from status signal processor is converted to from state, and cuts off the first passage of external attached device power supply by processor;
If testing result is non-overvoltage, then disconnect second channel, make its output major state signal, make principal and subordinate's automatic switch-over circuit processor is converted to major state according to the major state signal.
Wherein, when the second channel conducting, connected principal and subordinate's automatic switch-over circuit is output as high level; When second channel disconnected, connected principal and subordinate's automatic switch-over circuit was output as low level.
If principal and subordinate's automatic switch-over circuit is output as high level, then processor is in from state, and processor control first passage stops outside attached device power supply; If principal and subordinate's automatic switch-over circuit is output as low level, then processor is in major state, the outside attached device power supply of processor control first passage control circuit.
When processor is in from state, keep the conducting state of second channel with linking to each other from state retaining circuit by processor.
The voltage status that over-voltage detection circuit detects outer attached device one of may further comprise the steps:
When outer attached device was inactive component, over-voltage detection circuit was non-overvoltage to the testing result of its voltage;
When outer attached device was active equipment, over-voltage detection circuit was overvoltage to the testing result of its voltage.
Compared with prior art, beneficial effect of the present invention is: the present invention successfully adopts the Universal USB socket to realize the OTG function, effective combination of passive device and voltage reference device has realized the automatic switchover of ID state, the situation of effectively having avoided similar state to clash, in some cases, the voltage reference device also can replace with the over-voltage clamping diode, thereby has further reduced cost.
Description of drawings
Fig. 1 is the synoptic diagram of the USB OTG interface frame with automatic principal and subordinate's decision circuitry that provides of prior art;
Fig. 2 is a device frame synoptic diagram of realizing OTG based on the Universal USB socket provided by the invention;
Fig. 3 is a method flow diagram of realizing OTG based on the Universal USB socket provided by the invention;
Fig. 4 is the realization synoptic diagram based on Universal USB socket realization OTG control circuit that the embodiment of the invention provides;
Fig. 5 is that the another kind based on Universal USB socket realization OTG control circuit that the embodiment of the invention provides is realized synoptic diagram;
Fig. 6 is the synoptic diagram of the enable pin control LDO circuit that provides of the embodiment of the invention;
Fig. 7 is the state machine conversion synoptic diagram that the embodiment of the invention provides;
Fig. 8 is the software arrangements process flow diagram that the embodiment of the invention provides.
Embodiment
, should be appreciated that following illustrated preferred embodiment only is used for description and interpretation the present invention, and be not used in qualification the present invention a preferred embodiment of the present invention will be described in detail below in conjunction with accompanying drawing.
Fig. 2 has shown the device frame signal based on Universal USB socket realization OTG provided by the invention, and as shown in Figure 2, the realization module of this device comprises USB socket, first passage, over-voltage detection circuit, second channel, principal and subordinate's automatic switch-over circuit and processor.
USB socket is used to insert outer attached device, as USB flash disk or computing machine.USB socket also connects first passage, second channel and over-voltage detection circuit.
First passage is used for outside attached device power supply, can adopt controlled LDO (Low DropoutRegulator, low pressure difference linear voltage regulator) power supply, and wherein, first passage one end links to each other with USB socket, and the other end links to each other with processor.Under major state (being default conditions), principal and subordinate's automatic switch-over circuit is output as low level, and processor is in major state, and the control first passage is given outer attached device power supply.
Over-voltage detection circuit is used to detect the voltage status on the outer attached device path that is connected into by USB socket, it links to each other with USB socket, when the outer attached device on the socket belongs to treating apparatus such as computing machine, the voltage of outer attached device supply is in overvoltage condition, be magnitude of voltage on the USB socket by outer attached device supply be higher than the first passage supply magnitude of voltage (in the present invention, overvoltage is the voltage that its value is higher than the magnitude of voltage of first passage supply), after over-voltage detection circuit detects overvoltage, to trigger the second channel conducting or open, making the output of principal and subordinate's automatic switch-over circuit is high level by low transition, promptly export from status signal, processor is transferred to from state from major state to processor.Be in processor control first passage disconnection, thereby interrupt power supply USB socket from state.
On the other hand, when outer attached device is inactive component such as USB memory device, the voltage first passage of outer attached device provides, therefore the voltage that provides less than outer attached device is provided over-voltage detection circuit, detect non-overvoltage in other words, disconnect, make principal and subordinate's automatic switch-over circuit output low level thereby trigger second channel, promptly, cause processor to transfer major state to processor output major state signal.Be in the processor control first passage conducting of major state, outwards attached device provides power supply.
When the second channel conducting, connected principal and subordinate's automatic switch-over circuit is output as high level, thereby processor controls is in from state, when second channel disconnects, connected principal and subordinate's automatic switch-over circuit is output as low level, thereby processor controls is in major state.
Principal and subordinate's automatic switch-over circuit receive second channel output from status signal the time, control coupled processor and is converted to from state, when receiving the major state signal that second channel exports, control coupled processor and be converted to major state.
When processor is in from state, make second channel keep conducting state from state retaining circuit.
The present invention finishes the switching of the master slave mode of processor by the ID state of processor controls.When ID was high level, processor was in from state, and when ID was low level, processor was in major state.
Fig. 3 has shown the method flow based on Universal USB socket realization OTG provided by the invention, as shown in Figure 3:
Step S301, after outer attached device was inserted USB socket, over-voltage detection circuit detected the voltage status of outer attached device.
Step S302, if testing result is overvoltage, then the conducting second channel makes its output from status signal, makes principal and subordinate's automatic switch-over circuit basis from status signal processor is converted to from state, and cuts off the first passage of external attached device power supply by processor.
Step S303 if testing result is non-overvoltage, then disconnects second channel, makes its output major state signal, makes principal and subordinate's automatic switch-over circuit according to the major state signal processor is converted to major state.
What Fig. 4 had shown that the embodiment of the invention provides realizes the realization signal of OTG control circuit based on the Universal USB socket, as shown in Figure 4, among the figure among P1 ' and Fig. 2 P1 be same position, P2 is a same position among P2 ' and Fig. 2.
Over-voltage detection circuit is connected with first resistance R 1 by the voltage reference device and is constituted, and is connected between the source electrode and ground wire of thyristor VT3 of second channel, and the two ends of voltage reference device connect gate pole and the ground wire of VT3 respectively.When outer attached device was active equipment such as computing machine, the voltage of active equipment was overvoltage, made the conducting of voltage reference device, thereby dragged down the gate pole current potential of VT3; When outer attached device was inactive component such as USB memory device, inactive component did not provide voltage, made the voltage reference device be in non-overvoltage condition and not conducting, was high level thereby keep the gate pole of VT3.
Thyristor VT3 constitutes second channel; the source electrode of VT3 is the input end of second channel; drain electrode is the output terminal of second channel; link to each other with second resistance R 2 in principal and subordinate's automatic switch-over circuit; gate pole is the control end of second channel, links to each other with collector from the transistor switching circuit VT2 of state protection circuit.When the gate pole current potential of VT3 is dragged down, thyristor VT3 conducting, i.e. second channel conducting; When the gate pole of VT3 kept high level, thyristor VT3 ended, and promptly second channel disconnects.
Principal and subordinate's automatic switch-over circuit is made of triode VT1, second resistance R 2 and the 3rd resistance R 3, is first transistor switching circuit, and the base stage of VT1 is connected with the drain electrode of VT3 by R2, and its emitter directly is connected via R3 ground connection and with processor.When the VT3 conducting, VT1 is conducting also, and resistance to earth R3 makes principal and subordinate's automatic switch-over circuit be output as high level, and promptly the ID state is a high level, and processor is converted to from state after receiving this information; When VT3 ended, VT1 also was in cut-off state, and principal and subordinate's automatic switch-over circuit is output as low level, and promptly the ID state is a low level, and processor is converted to major state after receiving this information.
Being made of triode VT2, the 4th resistance R 4 and the 5th resistance R 5 from state retaining circuit, is second transistor switching circuit, and the base stage of VT2 is connected with processor via R4 ground connection and via R5, the direct ground connection of emitter, and collector is connected with the gate pole of VT3.When processor is in from state, by from State Control network control VT2 conducting, thereby make VT3 keep conducting state, be in from state to keep processor.
Under the situation of attached device, resistance to earth R3 makes the ID state be defaulted as low level outside not connecing, and after the software detection in the processor arrives, configuration processor is main state, and thyristor VT3 ends, and second channel disconnects, and this moment can external inactive component such as flash disk etc.When external equipment is active equipment such as computing machine, because of existing conflict to cause overvoltage, force the work of voltage reference device, this moment, the gate leve voltage of VT3 was dragged down the VT3 conducting, it is high level that VT1 conducting this moment makes the ID state, after software detection in the processor arrives, be from state, and enable to close the output of LDO configuration processor, and configuration be high level from State Control network N 1, with by being high level state from state retaining circuit maintenance ID.
What Fig. 5 had shown that the embodiment of the invention provides realizes that based on the Universal USB socket another kind of OTG control circuit realizes signal, as shown in Figure 5, among the figure among P1 ' and Fig. 2 P1 be same position, P2 is a same position among P2 ' and Fig. 2.The function of voltage reference device among Fig. 4 is realized that with the over-voltage clamping diode other annexation is identical with Fig. 4.Realization flow is identical with the working voltage standard, and when external inactive component, the ID state is a low level, and VT1 ends, and this moment, configuration processor was main state, and to enable LDO be the power supply of outer attached device.When external equipment is active equipment such as computing machine, over-voltage clamping diode current flow, VT3 conducting, and it is high level that the VT1 conducting makes the ID state, and this moment, configuration processor was from state, closed the output of LDO, and configuration be high level from State Control network N 1, is high level with assurance ID state.
Fig. 6 has shown the signal of the enable pin control LDO circuit that the embodiment of the invention provides, as shown in Figure 6, under processor was in major state, resistance to earth configuration ID state was a low level, and first passage is opened LDO to the OTG module for power supply by the enable pin OE of control LDO.
Fig. 7 has shown the state machine conversion signal that the embodiment of the invention provides, as shown in Figure 7, and by default, processor is in the Master state, and when ID was high level, processor switched to the Slave state, when ID is a low level, processor switches to the Master state.
Fig. 8 has shown the software arrangements flow process that the embodiment of the invention provides, as shown in Figure 8:
Step S801, initialization all is made as low level, i.e. N1=N2=0 from State Control network N 1 and major state Control Network N2.
Step S802～805 detect whether the ID state is low level (S802), if the ID state is a low level, promptly ID=0 then closes second channel (S803), opens the LDO of first passage, give outer attached device power supply (S804), at this moment, and N1=0, N2=1.Whether if the ID state is not a high level, then detecting the ID state is high level (S805), if be not high level, then skips to step S802, if high level then continues step S806.
Step S806, first passage enable to control the output of closing LDO, at this moment N2=0.
Step S807 opens second channel, and by guaranteeing that from state retaining circuit and second channel the ID state is a high level, this moment N1=1.
In sum, the present invention has following technique effect: the present invention successfully adopts the Universal USB socket to realize the OTG function, IGCT VT3, triode VT1 and VT2, and effective combination of voltage reference device has realized the automatic switchover of ID state, in realization major state in the situation that similar state clashes and from the automatic switchover between state, in some cases, the voltage reference device also can replace with the over-voltage clamping diode, thereby has further reduced cost.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art can carry out various modifications according to principle of the present invention. Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.
Claims (10)
1. the device based on Universal USB socket realization OTG is characterized in that, comprising:
First passage is used for outside attached device power supply;
Over-voltage detection circuit is used to detect the voltage status on the outer attached device path;
Second channel, be used in the testing result of receiving the overvoltage that over-voltage detection circuit sends, be converted into conducting state, and to processor output from status signal, perhaps in the testing result of receiving the non-overvoltage that over-voltage detection circuit sends, be converted into off-state, and to processor output major state signal;
Principal and subordinate's automatic switch-over circuit,, control coupled processor and be converted to from status signal according to described, and cut off the first passage of external attached device power supply by processor from state, perhaps, control coupled processor and be converted to major state according to described major state signal; And
From state retaining circuit, according to processor from status signal, make second channel keep conducting state.
2. a kind of device of realizing OTG based on the Universal USB socket according to claim 1, it is characterized in that, described over-voltage detection circuit is first resistance and voltage reference device series circuit or first resistance and over-voltage clamping diode series circuit, be connected between second channel input end and the ground wire, its voltage reference device or over-voltage clamping diode two ends connect the control end and the ground wire of second channel respectively.
3. a kind of device of realizing OTG based on the Universal USB socket according to claim 1, it is characterized in that, described second channel is made of thyristor, its source electrode is for connecting the second channel input end of outer attached device, its drain electrode is for connecting the second channel output terminal of principal and subordinate's automatic switch-over circuit, and its gate pole is the control end of second channel.
4. a kind of device of realizing OTG based on the Universal USB socket according to claim 1, it is characterized in that, described principal and subordinate's automatic switch-over circuit is first transistor switching circuit, its base stage is connected with the output terminal of second channel by second resistance, and its emitter directly is connected via the 3rd resistance eutral grounding and with processor.
5. a kind of device of realizing OTG based on the Universal USB socket according to claim 1, it is characterized in that, described is second transistor switching circuit from state retaining circuit, its base stage is connected with processor via the 4th resistance eutral grounding and via the 5th resistance, the direct ground connection of its emitter, its collector is connected with the control end of second channel.
6. the method based on Universal USB socket realization OTG is characterized in that, may further comprise the steps:
After outer attached device was inserted USB socket, over-voltage detection circuit detected the voltage status of described outer attached device;
If testing result is overvoltage, then the conducting second channel makes its output from status signal, makes principal and subordinate's automatic switch-over circuit processor is converted to from state from status signal according to described, and cuts off the first passage of external attached device power supply by processor; And
If testing result is non-overvoltage, then disconnect second channel, make its output major state signal, make principal and subordinate's automatic switch-over circuit processor is converted to major state according to described major state signal.
7. a kind of method based on Universal USB socket realization OTG according to claim 6 is characterized in that when the second channel conducting, connected principal and subordinate's automatic switch-over circuit is output as high level; And when second channel disconnected, connected principal and subordinate's automatic switch-over circuit was output as low level.
8. a kind of method based on Universal USB socket realization OTG according to claim 7 is characterized in that if principal and subordinate's automatic switch-over circuit is output as high level, then processor is in from state, and processor control first passage stops outside attached device power supply; And if principal and subordinate's automatic switch-over circuit is output as low level, then processor is in major state, the outside attached device power supply of processor control first passage control circuit.
9. according to claim 6ly a kind ofly realize it is characterized in that the method for OTG, when described processor is in from state, keep the conducting state of second channel with linking to each other from state retaining circuit by processor based on the Universal USB socket.
10. a kind of method based on Universal USB socket realization OTG according to claim 6 is characterized in that the voltage status that described over-voltage detection circuit detects outer attached device one of may further comprise the steps:
When outer attached device was inactive component, over-voltage detection circuit was non-overvoltage to the testing result of its voltage; And
When outer attached device was active equipment, over-voltage detection circuit was overvoltage to the testing result of its voltage.
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| CN201010225693.6A CN101944074B (en) | 2010-07-05 | 2010-07-05 | Method and device for realizing OTG based on USB socket |
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| CN201010225693.6A CN101944074B (en) | 2010-07-05 | 2010-07-05 | Method and device for realizing OTG based on USB socket |
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| CN101944074B CN101944074B (en) | 2014-12-10 |
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| 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 |
| CN110297789A (en) * | 2019-05-21 | 2019-10-01 | 晶晨半导体(上海)股份有限公司 | A method of realizing USB OTG function |
| CN110297789B (en) * | 2019-05-21 | 2023-07-28 | 晶晨半导体(上海)股份有限公司 | Method for realizing USB OTG function |
| CN113099517A (en) * | 2021-06-09 | 2021-07-09 | 广州朗国电子科技有限公司 | Network sharing method and device of all-in-one conference machine and all-in-one conference machine |
| CN113099517B (en) * | 2021-06-09 | 2021-08-31 | 广州朗国电子科技有限公司 | Network sharing method and device of all-in-one conference machine and all-in-one conference machine |
| CN113419515A (en) * | 2021-06-22 | 2021-09-21 | 上海星融汽车科技有限公司 | Master-slave mode switching method, electronic equipment and vehicle diagnostic instrument |
| CN117827716A (en) * | 2024-02-28 | 2024-04-05 | 苏州元脑智能科技有限公司 | Master-slave switching interface structure of server and application equipment thereof |
| CN117827716B (en) * | 2024-02-28 | 2024-04-30 | 苏州元脑智能科技有限公司 | Master-slave switching interface structure of server and application equipment thereof |
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| CN101944074B (en) | 2014-12-10 |
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