CN1321383C - Peripheral interface converter suitable for general-purpose serial bus and its control method - Google Patents
Peripheral interface converter suitable for general-purpose serial bus and its control method Download PDFInfo
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- CN1321383C CN1321383C CNB981027520A CN98102752A CN1321383C CN 1321383 C CN1321383 C CN 1321383C CN B981027520 A CNB981027520 A CN B981027520A CN 98102752 A CN98102752 A CN 98102752A CN 1321383 C CN1321383 C CN 1321383C
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Abstract
The present invention relates to a circumferential interface converter which is suitable for a universal serial bus, and a control method, which comprises a converting circuit, a power supply, a resistor and a switch, wherein the switch is connected between the power supply and the resistor and is used for controlling the switching-on and the switching-off of the power supply. One end of the converting circuit is connected to a transmission line with a universal serial bus interface, and one end of the resistor, and the other end is connected to an interface of peripheral equipment. The converting circuit is used for converting a signal between the interface of the peripheral equipment and a universal serial bus interface, and a signal controlled by the switch is sent out to control the switching-on and the switching-off of the switch. When the connection state of a peripheral interface and peripheral equipment is changed, a control switch of the signal controlled by the switch is switched off in temporal time and is switched on again.
Description
Technical field
The present invention relates to the conversion equipment between a kind of distinct interface, particularly relate to and a kind ofly old Non-Plug and Play (plug and play, the be called for short PnP) peripherals of interface can be converted to the suitable for general-purpose serial bus interface switching device and the control method of plug and play on the line (hot PnP) interface.
Background technology
After IBM Corporation develops the PC that PC XT and PC AT, the PC compatible with IBM PC promptly generally used by the whole world, in the meantime, because the progress of semiconductor technology, make the function of PC more and more stronger, simultaneously available equipment is also more and more, for example, along with popularizing of patterned operating system, Genius mouse (mouse) has been indispensable equipment, and for data is printed, printer almost also is indispensable, development along with world-wide web (internet), user at home need use modulator-demodular unit (MODEM) to connect network, and for fear of computer crash, can prepare jumbo back-up device, or want to deposit figure in computer, scanner (scanner) also generally is used.Equipment mentioned above is after PC occurs, and development is very general up at present successively, or even indispensable equipment.But because the function of each equipment need be used different interfaces, so far, a PC is if will use forenamed items of equipment, the line of computer back will be very considerable, because of the interface of every kind of equipment almost all inequality, the standard that some interface has become PC at present is equipped with, as connect the RS232 serial line interface of Genius mouse, or the parallel interface of connection printer, but some interface also needs other mounting interface card, SCSI (the Small Computer System Interface) interface that for example connects the high capacity back-up device, scsi interface promptly needs other mounting interface card, some equipment more need use proprietary interface again, is to use special special purpose interface as some scanner, the essential interface card that special use is installed.Therefore in PC, must provide many slots (slot) for the various interface card is installed, so the line of computer back is very miscellaneous.
Because above-mentioned situation, developed and USB (universal serial bus) (Universal Serial Bus, be called for short USB) unified interface specification, wish that various device all can use unified interface to connect, but the installation of simplified system like this, and computer inside does not also need to reserve too many space various particular interface cards is installed, USB interface also has the function of plug and play (PnP) in addition, be that PC can detect the equipment that is connected automatically, and relevant driver (driver) be installed used for the user.In addition, on old personal computer system, the user must do many settings when connecting a peripherals, after setting is finished, also will start shooting again and finish the installation procedure of software, and when equipment removed, system can't learn this message immediately, if the user carries out and during this device-dependent program, have error messages and produce, when serious, will cause system in case of system halt.And the equipment of employing USB interface, then wired function that goes up plug and play, can equipment be connected up at computer off-mode not, host computer all can detect and install relevant program automatically, need not through the step of starting shooting again again of shutting down, with allowing the user use the peripherals that newly connects, same, when peripherals removes, host computer also can detect and relative program be removed automatically, in order to avoid the user carries out relative program and produces mistake.
Though adopt USB unified standard interface that forenamed many advantages are arranged, but because the time of development is later, so still have many peripherals still to adopt old interface, the peripherals of this class promptly can't use USB interface to connect, therefore develop again and some conversion equipments, make this class adopt the peripherals of original interface to be connected on the computer by USB interface.
USB interface will reach plug-and-play feature, be a lifting resistance to be set in peripherals inside be connected on the USB interface signal wire, when being connected to the USB interface of host computer at peripherals, the signal wire current potential of the USB interface of host computer is changed, and this change makes host computer can begin to do detection immediately.During detection, send some requests (request) by host computer, peripherals gives to respond (descriptor), and therefore host computer learns the situation of peripherals, so host computer can be finished the plug and play action of peripherals.But because some equipment is on rigidly connecting during host computer, work or the various interface of not initializing fully as yet is unstable as yet, if at this moment these equipment are received the instruction that host computer is sent here, can't handle, cause misjudgment, therefore can wait the complete initialization of system, after the working stability, just will promote resistance and connect, so that guarantee can misjudgment.
Though making, more existing conversion equipments adopt the peripherals of old interface to be connected to computer by USB interface, but the function of the known conversion equipment that these have developed out is limited, only can accomplish that with old interface conversion be USB interface, and the message that conversion equipment on host computer, only can occur, but can not show the relevent information of the peripherals that conversion equipment connects.Can not reach the purpose of plug and play on the line in addition, therefore, may make a mistake during execution.If will utilize process simulation, whether the state that adopts the mode of inquiring (polling) to detect peripherals changes, and will influence the work efficiency of system, and waste system resource, and this practice has lost the real purpose of plug and play, also may have problems on compatibility.
Comprehensive above-mentioned discussion, there is following shortcoming in known as can be known USB conversion equipment:
1. only accomplish between interface the conversion of transmission data, can only show the relevent information of conversion equipment at host computer, can't show the relevent information of the peripherals that is connected, the user can not grasp the state of peripherals really, uses inconvenient.
2. the function that does not possess plug and play on the line, host computer can not detect the connection situation of peripherals automatically, cause the user improper because of executive routine, for example when connecting, do not carry out, to make the host computer cisco unity malfunction, if use process simulation, can influence the regular event of host computer again, also have the problem of compatibility.
Summary of the invention
The object of the present invention is to provide a kind of suitable for general-purpose serial bus interface switching device, old interface can be adapted through conversion equipment and USB interface, and make host computer except that the message that can show conversion equipment, when peripherals connects, the message that also can show peripherals is so that the user can grasp the state of peripherals really.
But another object of the present invention is to provide the USB (universal serial bus) conversion equipment of plug and play, utilize the lifting resistance that changes the USB interface signal wire whether to connect, host computer is detected automatically, and conversion equipment is passed suitable information again back and is given host computer, but and makes the peripherals plug and play.
A further object of the present invention is to provide a kind of control method that is suitable for the interface switching device of claim 1.
For achieving the above object, the present invention takes following measure:
Plug and play USB conversion equipment of the present invention, in order to the USB interface that is a PnP with a non-PnP interface conversion, can allow the peripherals of non-PnP interface be connected to the USB interface of host computer, USB interface has one first transmission line, and conversion equipment mainly comprises switch, resistance and change-over circuit.
Wherein change-over circuit is responsible for the conversion of signal between non-PnP interface and USB interface, and by the cut-out of switch controlling signal gauge tap with lead, resistance then plays the booster tension effect, and the one end is coupled to first transmission line of USB interface, and the other end is connected to positive supply through switch.
Switch is in the conducting shape at ordinary times, when Non-Plug and Play interface and peripherals by not being connected when becoming connection status, change-over circuit cuts off a blink, conducting again more earlier via switch controlling signal control beginning, the variation that the discernable peripherals of host computer connects, active detecting.
When Non-Plug and Play interface and peripherals become when not connecting by being connected, same, change-over circuit also cuts off (in a blink), conducting again more earlier via the switch controlling signal gauge tap.
A preferred embodiment of the present invention, the general-purpose serial bus USB interface comprises one first transmission line and one and second transmission line of its complementation, whether first transmission line can connect peripherals at a high speed for detecting, second transmission line can be for detecting the peripherals that whether connects low speed, and second transmission line can be for detecting the peripherals that whether connects low speed.Other one current potential that promotes the positive supply that resistance connected is 3.3V.
The general-purpose serial bus USB conversion equipment more comprises a database, for the data of depositing peripherals, and when detecting the peripherals of Non-Plug and Play interface connection for change-over circuit, can be by the relevant information of the data base querying peripherals that installs.
A kind of suitable for general-purpose serial bus peripheral interface conversion equipment of the present invention is characterized in that, comprising: change-over circuit, a power supply, a resistance and a switch;
Described switch is connected between power supply and the resistance, with the connection and the cut-out of control power supply;
Described change-over circuit, one end is connected to a transmission line of USB (universal serial bus) and an end of described resistance, the other end is used to connect peripheral interface, with the signal between conversion peripheral interface and the USB (universal serial bus), and send the connection and the cut-out of a switch controlling signal gauge tap, either-or;
When peripheral interface and peripherals become when connecting by not being connected, described switch controlling signal gauge tap is earlier in of short duration time internal cutting off, a conducting again again;
When peripheral interface and peripherals become when not connecting by being connected, described switch controlling signal gauge tap is cut off earlier, conducting again again.
A kind of control method of suitable for general-purpose serial bus peripheral interface conversion equipment comprises the following steps:
First transmission line of USB (universal serial bus) is promoted to a supply voltage;
When peripheral interface and peripherals become when connecting by not being connected, first transmission line cut off with the power supply short time, again connection;
When peripheral interface and peripherals become when not connecting by being connected, first transmission was cut off with the power supply short time, connected again.
The control method of plug and play USB (universal serial bus) conversion equipment on a kind of line, first transmission line of described USB (universal serial bus) is connected to a power supply through a resistance and a switch;
It is characterized in that, comprise the following steps:
Carry out the phase one and set, send the message of change-over circuit and give a host computer;
Check whether peripheral interface is connected to peripherals, and when not connecting, rechecking is up to connection;
Judge which kind of form peripherals is;
Resistance was connected by first transmission line cut-out a period of time again;
Carry out subordinate phase and set, send the message of peripherals and give described host computer;
Carry out the major cycle step, check whether peripheral interface connects peripherals, when not connecting, by switch dump a period of time is connected again, get back to the phase one then and set step, repeat step thereafter;
When check result is connection, transmits the instruction of host computer and give peripherals; And get back to the major cycle step.
In conjunction with preferred embodiment and accompanying drawing, device of the present invention is described in detail as follows:
The accompanying drawing simple declaration
Fig. 1 is USB conversion equipment of the present invention and host computer and peripherals connection diagram.
Fig. 2 is the circuit diagram that peripherals is connected with the USB interface checkout equipment.
Fig. 3 is the circuit block diagram of conversion equipment of the present invention.
Fig. 4 is the process flow diagram that the two-part of control method of the present invention is set.
Fig. 5 is the process flow diagram that stepwise is set that advances of control method of the present invention.
Fig. 6 is first kind of combination of circuits synoptic diagram in the control method
Fig. 7 is second kind of combination of circuits synoptic diagram in the control method.
Fig. 8 is the third combination of circuits synoptic diagram in the control method.
Embodiment
Please refer to Fig. 1, it represents conversion equipment of the present invention and host computer and peripherals connection diagram.Host computer 110 can detect the peripherals of the tool plug-and-play feature that connects by USB interface, but peripherals 130 does not have the interface of USB, be an equipment that does not have plug-and-play feature, it can only be connected with host computer 110 as parallel interface, scsi interface or serial line interface via other interface.But according to connected mode shown in Figure 1, the interface of peripherals 130 is via USB conversion equipment 120, promptly can be exchanged into USB interface with plug-and-play feature, promptly when peripherals 130 is connected to host computer 110 via USB conversion equipment 120, host computer 110 can detect the existence of peripherals 130 immediately, and know it is to belong to which kind of equipment, and use suitable driver and application program, the user also can use peripherals 130 by host computer 110.Equally, when peripherals 130 was separated by host computer 110, host computer 110 also can detect the message of its disappearance immediately, with relevant driver and application program cancellation, in order to avoid the non-existent peripherals of user's misuse.
Embodiments of the invention one are voltage to be set promote resistance in peripherals, promote with the voltage with the transmission line of USB interface.
A host computer of receiving USB interface, its detect whether have peripherals to be connected to USB interface mode as shown in Figure 2, USB interface is provided with two signal transmssion line D+ and D-, it is complementary transmission data line, wherein whether the first transmission line D+ can connect high-speed peripheral for detecting, whether the second transmission line D-can connect low speed peripherals for detecting, can be provided with a voltage in peripherals 210 (being assumed to be high-speed peripheral) inside and promote (pull up) resistance 220, be promoted to 3.3V in order to voltage D+ with first transmission line of USB interface at this.When peripherals 210 is connected to the USB interface of host computer, or when separating by the host computer USB interface, the current potential of the first transmission line D+ of the USB interface of host computer is changed, host computer can learn whether peripherals is in connection status now.Therefore, conversion equipment of the present invention promptly utilizes control voltage lifting resistance whether to connect, and makes host computer detect the variation of connection device automatically, and reaches the function of plug and play on the line.
As shown in Figure 3, it is the circuit block diagram conversion equipment 120 of another embodiment of the present invention, can with the interface conversion of Non-Plug and Play the USB interface of plug and play, non-PnP interface can be for connecting a peripherals that does not have the PnP interface, and non-PnP interface can be parallel interface, scsi interface or serial line interface.
Depositing the related data of the peripherals 130 of the various non-PnP interfaces that may connect in the database 320, when the non-PnP interface of conversion equipment 120 connects the peripherals 130 of a last non-PnP interface, change-over circuit 310 can be by extracting corresponding message in the database 320, for example device number (product Id.) is given these data the host computer 110 of the USB interface that is connected conversion equipment 120 again.
The effect of resistance 340 is the positive supplies that the voltage D+ of first transmission line of USB interface are promoted to 3.3V, and whether 330 controls that are subjected to change-over circuit 310 of switch promote resistance 340 with decision and work.When switch 330 cuts off, promote not effect of resistance 340, for host computer 110, separate with host computer 110 as conversion equipment 120, and when switch 330 conducting once more, promote resistance 340 voltage of the first transmission line D+ of USB interface is promoted to the positive supply of 3.3V, host computer 110 detects this variation, concerning host computer 110, be connected once more as conversion equipment 120.
When peripherals 130 was connected or separated by the non-PnP interface of conversion equipment 120, change-over circuit 310 connected after utilizing switch 330 controls to promote the cut-out of resistance 340 again, makes host computer 110 active detecting, and reaches the effect of plug and play on the line.For example, when conversion equipment 120 is connected to host computer 110, peripherals 130 is not connected to the non-PnP interface of conversion equipment 120 as yet, and then 120 related datas with of conversion equipment itself send host computer 110 to, and host computer 110 also only provides the message of conversion equipment 120 to the user.When non-PnP interface does not connect peripherals 130, whether conversion equipment can detect at any time has the peripherals limit to link non-PnP interface, if when detecting peripherals 130 and being connected to non-PnP interface, change-over circuit 310 will gauge tap 330 be in dissengaged positions, make resistance 340 no castering actions, host computer 110 will think that conversion equipment 120 has separated this moment, and relevent information is removed.After after a while, change-over circuit 310 gauge tap 330 conductings again, host computer 110 will think that conversion equipment 120 is new devices that connect this moment, require relevent information to conversion equipment 120, the relevent information of the peripherals 130 that conversion equipment 120 will just connect is passed to host computer 110,110 of host computers offer the user with this message, and the user can use peripherals 130 immediately.In the process that peripherals 130 is connecting, whether conversion equipment 120 also detects peripherals 130 at any time separates, separated if detect peripherals 130, change-over circuit 120 also will promote resistance 340 with gauge tap 330 and cut off positive supply, host computer 110 detects this variation, the relevent information of peripherals 130 can be removed, the user can't continue to use peripherals 130 again.After a while change-over circuit 310 again gauge tap 330 will promote resistance 340 and take back positive supply, host computer 110 detects the variation of USB interface, will require conversion equipment 120 with relevent information, passes host computer 110 back.Via above process, the peripherals of non-as can be known PnP interface is connected to host computer 110 via USB interface again through conversion equipment 120, can make the peripherals of non-PnP interface become the peripherals of plug and play on line.
Change-over circuit 310 in the above-mentioned conversion equipment is a microcontroller, and adopting model in the present embodiment is the microcontroller of PIC16CR57A.
In order to illustrate in greater detail the manner of execution of conversion equipment 120, below with its course of action of flowchart text of Fig. 4 and Fig. 5, wherein Fig. 4 is the process flow diagram of two stage settings (configuration) in the control method, and Fig. 5 is the process flow diagram set of stepwise into.
The course of action set of two stages of fixing of key diagram 4 at first.
Step 410 is after conversion equipment 120 starts, and carries out initialization (hardwareinitialize) work of hardware earlier.
Step 412 is after the hardware initialization, carries out the phase one and sets, and the relevant breaths of establishing that also are about to conversion equipment 120 itself send host computer 110 to.
Whether step 414 has peripherals to be connected to non-PnP interface for detecting, if detect less than peripherals, then continues duplicate detection, connects up to having detected peripherals, carries out next step again.
Step 420 is connected to non-PnP interface for detecting peripherals 130, and change-over circuit 310 is searched database 320 to judge which kind of equipment peripherals 130 is according to the data that detect.
After the pattern of step 422 for definite peripherals 130, conversion equipment 120 is prepared data are passed to host computer 110, will promote to connect again after resistance 340 cuts off a period of times again, makes host computer 110 detect its variation.
Step 424 is carried out the subordinate phase setting, and the relevent information that also is about to peripherals 130 transmits host computer.
Whether step 426 still keeps connection state for detecting peripherals 130.
Step 430 still keeps line for peripherals 130, the instruction that conversion equipment 120 is sent host computer 110 here transfers to peripherals 130, or give host computer 110 with the data that peripherals is sent here, and then get back to step 426, so repeatedly be that host computer 110 and peripherals 130 transmit message.
When step 440 has been separated for peripherals 130, conversion equipment 120 will promote resistance and connect again after 340 cut-out a period of times again, so that host computer 110 is learnt this variation, get back to step 412 then and will do the phase one setting.
Advance the operation of stepwise (advanced) setting below again according to the process flow diagram discussion another kind of Fig. 5.
Step 510 is after conversion equipment 120 starts, and carries out the initial work of hardware earlier.
Whether step 512 has peripherals to be connected to non-PnP interface for detecting, if detect peripherals, then skips to step 530, if do not measure the peripherals line, then to next step.
Step 520 does not detect the peripherals line, then carries out the phase one and sets, and sends the conversion equipment 120 relevant breaths of establishing own to host computer 110.
Whether step 522 has peripherals to be connected to non-PnP interface for detecting, if detect less than peripherals, then continues duplicate detection, up to having detected peripherals connection carrying out again next step.
Step 530 is connected to non-PnP interface for detecting peripherals 130, and change-over circuit 310 judges that according to the data search database 320 that detects which kind of equipment peripherals 130 is.
After the form of step 532 for definite peripherals 130, conversion equipment 120 is prepared data are passed to host computer 110, will promote to connect again after resistance 340 cuts off a period of times again, makes host computer 110 detect its variation.
Step 534 is carried out the subordinate phase setting, and the relevent information of peripherals 130 is passed to host computer.
Whether step 536 still keeps connection state for detecting peripherals 130.
Step 540 still keeps line for peripherals 130, and the instruction that conversion equipment 120 is sent host computer 110 here transfers to peripherals 130, and then gets back to step 536, repeats to be host computer 110 and peripherals 130 transmission messages.
Step 550 has been separated for peripherals 130, and conversion equipment 120 will promote resistance and connect again after 340 cut-out a period of times again, so that host computer 110 is learnt this variation, get back to step 512 then.
Two-part is set and is advanced not existing together that stepwise sets, and is that two-part is set fixedly to finish the phase one and set, and reexamines whether the peripherals line is arranged, if having, does the subordinate phase setting again; Advancing the stepwise setting then is promptly to check earlier whether the peripherals line is arranged before carrying out the phase one setting, then directly carries out the subordinate phase setting as if having.No matter adopt which kind of mode, all can reach the purpose of plug and play on the line, just the process difference.
When connecting the peripherals of non-PnP interface, have several combinations when mounted, shown in the 6th figure to the 8 figure via conversion equipment 120.
The 6th figure is depicted as first kind of combination, in step 1, has only conversion equipment 120 to be connected to host computer 110, and peripherals 130 does not connect, and can detect and install conversion equipment 120 at host computer 110.Arrived step 2, all attached device 130 are connected to the non-PnP interface of conversion equipment 120, conversion promotes resistance 340 and cuts off and connect, makes host computer 110 detect also installing peripherals 130 again.
Figure 7 shows that second kind of combination, in step 1, peripherals 130 is connected to conversion equipment 120 earlier, and it is that conversion equipment 120 will detect in advance for which kind of peripherals.To step 2, conversion equipment 120 is connected to host computer 110, and host computer can detect and installing peripherals 130.
Fig. 8 is the third combination, and when first step, host computer 110, conversion equipment 120 and peripherals 130 all connect, and conversion equipment 120 will detect the type of peripherals 130 earlier, and host computer 110 can detect and installing peripherals 130 then.
Via the discussion of above embodiment as can be known, the USB conversion equipment can convert the peripherals of old non-PnP interface to the USB device of plug and play on the line, after peripherals is connected to computer via conversion equipment, need not to start shooting again, computer can detect and install the peripherals of connection immediately, makes the peripherals of old non-PnP interface become the USB device with plug and play on the line.
From above discussion, the plug and play USB conversion equipment and the known practice relatively have following effect on the line of present embodiment as can be known:
1, accomplishes that not only with old interface conversion be USB interface, and on host computer except the relevent information that can show conversion equipment, the relevent information that also can show the peripherals that is connected, the user can grasp the state of peripherals really, and it is comparatively convenient to use.
2, can increase the function of plug and play on the line, the voltage of the signal wire of mat change USB interface promotes the effect of resistance, make host computer can detect the connection situation of peripherals automatically, and install or remove relevant program, can not go out the phenomenon that the user carries out inappropriate program, make host computer energy operate as normal, and preferable compatibility is arranged.
Claims (8)
1, a kind of suitable for general-purpose serial bus peripheral interface conversion equipment is characterized in that, comprising: change-over circuit, a power supply, a resistance and a switch;
Described switch is connected between power supply and the resistance, with the connection and the cut-out of control power supply;
Described change-over circuit, one end is connected to a transmission line of USB (universal serial bus) and an end of described resistance, the other end is used to connect peripheral interface, with the signal between conversion peripheral interface and the USB (universal serial bus), and send the connection and the cut-out of a switch controlling signal gauge tap, either-or.
2, conversion equipment according to claim 1 is characterized in that, also comprises a database, is coupled to change-over circuit, to store the information of peripherals.
3, conversion equipment according to claim 1 is characterized in that, whether described transmission line connects high-speed peripheral for detecting.
4, conversion equipment according to claim 1 is characterized in that, whether second transmission line that described change-over circuit also connects USB (universal serial bus) connects low speed peripherals for detecting.
5, conversion equipment according to claim 1 is characterized in that, described USB (universal serial bus) connects a host computer.
6, a kind of control method of suitable for general-purpose serial bus peripheral interface conversion equipment comprises the following steps:
First transmission line of USB (universal serial bus) is promoted to a supply voltage;
When peripheral interface and peripherals become when connecting by not being connected, first transmission line cut off with the power supply short time, again connection;
When peripheral interface and peripherals become when not connecting by being connected, first transmission line and power supply short time cut off, and connect again.
7, the control method of plug and play USB (universal serial bus) conversion equipment on a kind of line, wherein, first transmission line of USB (universal serial bus) is connected to a power supply through a resistance and a switch;
It is characterized in that, comprise the following steps:
Carry out the phase one and set, send the message of change-over circuit and give a host computer;
Check whether peripheral interface is connected to peripherals, and when not connecting, rechecking is up to connection;
Judge which kind of form peripherals is;
Resistance was connected by first transmission line cut-out a period of time again;
Carry out subordinate phase and set, send the message of peripherals and give described host computer;
Carry out the major cycle step, check whether peripheral interface connects peripherals, when not connecting, by switch dump a period of time is connected again, get back to the phase one then and set step, repeat step thereafter;
When check result is connection, transmits the instruction of host computer and give peripherals; And
Get back to the major cycle step.
8, a kind of control method of suitable for general-purpose serial bus peripheral interface conversion equipment, wherein, first transmission line of USB (universal serial bus) is connected to a power supply through a resistance and a switch;
It is characterized in that, comprise the following steps:
Carry out the first time and judge, check whether peripheral interface connects peripherals;
When check result when not connecting, do the phase one and set, send the message of change-over circuit and give host computer;
Carry out the second time and judge, check whether peripheral interface connects peripherals, and when not connecting, rechecking is up to connection;
When judge for the first time with the result who judges for the second time in have one when being connected, the execution following steps:
Judge which kind of form peripherals is;
Described resistance was connected by first transmission line cut-out a period of time again;
Carry out subordinate phase and set, send the message of peripherals and give host computer;
Carry out the major cycle step, check whether peripheral interface connects peripherals;
When not connecting, by switch dump a period of time is connected again, get back to determining step for the first time then, repeat step thereafter;
When check result is connection, transmits the instruction of host computer and give peripherals; And
Get back to the major cycle step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981027520A CN1321383C (en) | 1998-07-01 | 1998-07-01 | Peripheral interface converter suitable for general-purpose serial bus and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB981027520A CN1321383C (en) | 1998-07-01 | 1998-07-01 | Peripheral interface converter suitable for general-purpose serial bus and its control method |
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| Publication Number | Publication Date |
|---|---|
| CN1240963A CN1240963A (en) | 2000-01-12 |
| CN1321383C true CN1321383C (en) | 2007-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB981027520A Expired - Fee Related CN1321383C (en) | 1998-07-01 | 1998-07-01 | Peripheral interface converter suitable for general-purpose serial bus and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104937516A (en) * | 2013-01-28 | 2015-09-23 | 惠普发展公司，有限责任合伙企业 | Detecting device installation and removal on a port |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338594C (en) * | 2004-09-30 | 2007-09-19 | 威盛电子股份有限公司 | USB control circuit having host mode and controlled mode switching function and its method |
| CN100428211C (en) * | 2005-11-03 | 2008-10-22 | 凌阳科技股份有限公司 | Circuits at sending end, circuits at receiving end, interface switching module, and interface switching method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19631050A1 (en) * | 1996-08-01 | 1998-02-05 | Frank Bergler | Interface converter for universal serial bus |
-
1998
- 1998-07-01 CN CNB981027520A patent/CN1321383C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19631050A1 (en) * | 1996-08-01 | 1998-02-05 | Frank Bergler | Interface converter for universal serial bus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104937516A (en) * | 2013-01-28 | 2015-09-23 | 惠普发展公司，有限责任合伙企业 | Detecting device installation and removal on a port |
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| Publication number | Publication date |
|---|---|
| CN1240963A (en) | 2000-01-12 |
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