CN100481051C - Method and device for implementing universal serial bus host machine controller driving universal adapting adaptation layer - Google Patents
Method and device for implementing universal serial bus host machine controller driving universal adapting adaptation layer Download PDFInfo
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Abstract
The invention provides a USB host apparatus comprising a standard USB host controller driven HCD unit, a simplified HCD unit, a host controller HC unit and a universal adaptive layer, wherein the simplified HCD unit is used for supplying simple drive to HC unit, the universal adaptive unit provides a virtual standard interface to realize the interaction between the HC unit and standard HCD unit. The invention also provides a USB HCD universal adaptive layer implementation method. The USB HCD universal adaptive layer implementation method and device can simplify non-standard HC drive design and lessen the development work load, besides, the reuseability is favorable, and the development and maintenance cost are saved effectively.
Description
Technical field
The present invention relates to field of computer technology, especially refer to generic adaptation layer implementation method and the device of a kind of USB (Universal Serial Bus, universal serial port bus) HCD (Host Controller Driver, console controller drives).
Background technology
USB is as a kind of computer external serial communication interface standard, has advantages such as plug and play, data transmission are reliable, expansion convenience, low cost, present one of the indispensable interface of computing machine that become.In recent years, along with the USB technology also is applied to built-in field gradually, also begin to realize the application of circumscribed USB equipment such as datacom devices such as router, switches by USB interface.
Fig. 1 is a usb communication model hierarchy structural drawing of the prior art, and the communication between the system is kept by the USB drive software as shown in the figure, comprises usb host end drive software and USB device drive software.Functional perspective from software, the USB system belongs to a kind of host-guest architecture, instigate the everything of system by usb host, and the work of coordination distinct device, and the order that need send main frame in system of USB device drive software is made explanations and is responded, therefore the function of usb host end drive software is particularly important, and it realizes also complicated more than device drives.With reference to shown in Figure 1, usb host end drive software is by HCD, USBD (USB driver, the usb host driver) and client driver form, wherein HCD mainly finishes the driving to usb host controller hardware, directly combines the transmission that realizes data and order towards hardware layer and with upper layer software (applications).At present in Universal USB 1.1 console controller standards, OHCI (the Open Host Controller Interface Specification that Microsoft proposes, Microsoft's open USB1.1 host controller interface standard) from register stage usb host controller is described in detail, for the software and hardware of console controller provides unified open interface standard, and software-driven is comparatively simple, thereby is widely used in built-in field.Remove UHCI (the Universal Host Controller Interface Specification that OHCI and Intel (Intel) company propose, Intel Universal USB 1.1 host controller interface standards) outside, also there are a large amount of off-gauge usb host controllers in built-in field, because the function that the usb host controller hardware of different manufacturers exploitation is finished is not quite similar, thereby the realization of HCD also needs correspondence adjustment.
Use for the Embedded USB that adopts non-standard usb host controller in the prior art, normally carry out the independent exploitation of complete HCD based on the spare interface of corresponding usb protocol stack and the function of concrete non-standard usb host controller, it exists, and design is complicated, the development amount reaches defectives such as reusability difference greatly; Or based on the standard HCD of corresponding usb protocol stack, as OHCD (Open Host ControllerDriver, open console controller drives) or UHCD (Universal Host Controller Driver, the universal host machine controller drives), carry out the exploitation of software adaptation layer, thereby under this adaptation layer, only realize basic controlling operation to non-standard usb host controller, as for the realization relevant and then finishing by corresponding standard HCD with the interface of usb protocol stack with the USB standard, but it compares simplified design with aforementioned schemes, reduce workload, but the software adaptation layer of exploitation can not be implemented in general in the dissimilar non-standard usb host controllers, exists coupling to reach the defective of reusability difference by force.
Summary of the invention
The purpose of this invention is to provide a kind of USB HCD generic adaptation layer implementation method and device, with driving design that solves non-standard usb host controller in the prior art and the defective of developing difficulty or reusability difference.
For achieving the above object, the present invention proposes a kind of usb host device, comprises standard HCD unit, simplifies HCD unit and HC unit, also comprises the generic adaptation layer unit,
Described simplification HCD unit is for described HC unit provides driving;
Described generic adaptation layer unit is connected with described standard HCD unit, and for described simplification HCD unit provide virtual standard interface with realize described HC unit and described standard HCD unit alternately;
Described generic adaptation layer unit further comprises:
The virtual hardware register is connected with described simplification HCD unit and according to described standard HCD unit the hardware register of standard definition is simulated;
The virtual register access interface is connected with described virtual hardware register and provides the access interface that described virtual hardware register is read and write for described simplification HCD unit;
The data structure access interface is used to realize that described simplification HCD unit conducts interviews according to the data structure of described standard HCD unit to standard definition;
Virtual interruption subelement is connected with described standard HCD unit, is used for according to described standard HCD unit the hardware interrupts of standard definition being simulated.
Described generic adaptation layer unit also comprises the virtual root hub interface, according to described standard HCD unit the Root Hub of standard definition is simulated, and is selected to call according to the Root Hub function of described HC unit by described simplification HCD unit.
Described generic adaptation layer unit also comprises the transmission notice interface, is connected with described simplification HCD unit, is used for starting or stoping to described simplification HCD unit notification data transmission.
Described generic adaptation layer unit also comprises initialization interface, is connected with described simplification HCD unit, is used for described virtual hardware register, simplification HCD unit and HC unit are carried out initialization.
The present invention also proposes a kind of USB HCD generic adaptation layer implementation method, comprising:
According to described standard HCD the hardware register of standard definition is simulated, the virtual hardware register is set;
For described simplification HCD is provided with the virtual register access interface that described virtual hardware register is read and write;
The data structure access interface is set to conduct interviews to the data structure of standard definition according to described standard HCD to realize described simplification HCD;
According to described standard HCD the hardware interrupts of standard definition is simulated, virtual interruption is set;
HC utilizes the driving of described simplification HCD, is undertaken alternately by described generic adaptation layer and described standard HCD.
Describedly according to standard HCD generic adaptation layer is set and further comprises:
Describedly according to standard HCD generic adaptation layer is set and also comprises:
The virtual root hub interface is set, the Root Hub of standard definition is simulated, and select to call according to the Root Hub function of described HC by described simplification HCD according to described standard HCD.
Describedly according to standard HCD generic adaptation layer is set and also comprises:
The data transmission notice interface is set, is used for described standard HCD starting or stoping to described simplification HCD notification data transmission.
Describedly according to standard HCD generic adaptation layer is set and also comprises:
Initialization interface is set, is used for before described standard HCD carries out initialization, described virtual hardware register, simplification HCD and HC being carried out initialization.
Described standard HCD is OHCD or UHCD.
Compared with prior art, device and method embodiment of the present invention, by the realization generic adaptation layer is simulated in register, interface and the interruption etc. of standard HCD definition, in conjunction with simplifying the complete driving that HCD can realize non-standard HC, driving design and the development workload of non-standard HC have been simplified, and have the good characteristics of reusability, be suitable for supporting simultaneously the driving of multiple non-standard HC, thereby effectively save exploitation and maintenance cost.
Description of drawings
Fig. 1 is a usb communication model hierarchy structural drawing of the prior art;
Fig. 2 is embodiment one synoptic diagram of usb host device of the present invention;
Fig. 3 is embodiment two synoptic diagram of usb host device of the present invention;
Fig. 4 is the embodiment process flow diagram of USB HCD generic adaptation layer implementation method of the present invention.
Embodiment
In conjunction with the accompanying drawings the present invention is further set forth with specific embodiment below.
The present invention discloses a kind of usb host device of the USB of realization HCD generic adaptation layer, and embodiment one comprises standard HCD unit 210, simplifies HCD unit 220 and HC unit 230 as shown in Figure 2, also comprises generic adaptation layer unit 240.Wherein, simplifying HCD unit 220 is used for providing simple and easy driving according to the concrete function of non-standard HC unit 230 for it; And generic adaptation layer unit 240 then is located between standard HCD unit 210 and the simplification HCD unit 220, and provides virtual standard interface to realize the mutual of HC unit 230 and standard HCD unit 210 for simplifying HCD unit 220.
In the foregoing description, generic adaptation layer unit 240 further comprises virtual hardware register 241, virtual register access interface 242, data structure access interface 243 and virtual interruption subelement 244.Wherein, virtual hardware register 241 carries out software simulation according to the hardware register of the 210 pairs of standard definitions in standard HCD unit; Virtual register access interface 242 is connected with virtual hardware register 241, and provides the access interface that virtual hardware register 241 is read and write for simplifying HCD unit 220; 243 of data structure access interfaces offer simplifies HCD unit 220 to realize that its standard data structure that standard HCD unit 210 is safeguarded conducts interviews; Virtual interruption subelement 244 is connected with standard HCD unit 210, and is used for simulating according to the hardware interrupts of the 210 pairs of standard definitions in standard HCD unit.
The embodiment of the invention described above usb host device, by at standard HCD and provide for non-standard HC between the simplification HCD of simple and easy driving the software generic adaptation layer is set, hardware register, data structure and access interface, hardware interrupts to standard definition are simulated realization, can in conjunction with simplify HCD realize between HC and the standard HCD alternately, thereby realize the complete driving of non-standard HC, can simplify the workload that non-standard HC drives design and development.
Fig. 3 is embodiment two synoptic diagram of usb host device of the present invention, it has increased the support to interfaces such as Root Hub function and initialization on the basis of embodiment one, as shown in the figure, the usb host device still comprises standard HCD unit 210, simplifies HCD unit 220 and HC unit 230 in the present embodiment, also comprises generic adaptation layer unit 240.240 of generic adaptation layer unit further comprise virtual hardware register 241, virtual register access interface 242, data structure access interface 243 and virtual interruption subelement 244.The function of said units and subordinate's subelement and connection are described identical with embodiment one, are not given unnecessary details herein.
In the present embodiment, generic adaptation layer unit 240 also comprises virtual root hub interface 245, transmission notice interface 246 and initialization interface 247.Wherein, virtual root hub interface 245 is simulated according to the Root Hub of the 210 pairs of standard definitions in standard HCD unit, and selects to call according to HC unit 230 concrete Root Hub functions by simplifying HCD unit 220; 246 transmission notice interfaces with simplify HCD unit 220 and be connected, be used for to starting or stoping that its notification data transmits; Initialization interface 247 is connected with simplification HCD unit 220, is used for virtual hardware register 241, simplification HCD unit 220 and HC unit 230 are carried out initialization.
In the foregoing description, the generic adaptation layer simulation that is provided with between standard HCD and non-standard HCD has realized hardware register, data structure and access interface, hardware interrupts, Root Hub function, initialization interface and the data transmission notice interface of standard definition, thereby perfect standard HCD mutual by between adaptation layer and non-standard HCD and the non-standard HC realized the complete driving of non-standard HC.The realization of above-mentioned generic adaptation layer in the usb host device can be simplified the workload that non-standard HC drives design and development, finish with cooperating of usb protocol stack by standard HCD, and realization mutual between standard HCD is then finished by generic adaptation layer, and concrete function realizes thereby the design and development of the simplification HCD that provides at different HC then only need be considered non-standard HC; Its reusability of generic adaptation layer that the while embodiment of the invention provides is good, is suitable for supporting simultaneously the realization of multiple non-standard HC, thereby effectively saves exploitation and maintenance cost.
The present invention also discloses a kind of USB HCD generic adaptation layer implementation method, and one embodiment may further comprise the steps as shown in Figure 4:
S401, the hardware register of standard definition is simulated, the virtual hardware register is set according to standard HCD.
Since the hardware register of non-standard HC definition may with the hardware register of standard HCD definition all or have part different, therefore must realize the software simulation of whole standard HCD definition hardware registers as generic adaptation layer.Generic adaptation layer is in conjunction with the simplification HCD of its lower floor, and the virtual hardware register by being provided with can carry out according to existing standard and standard HCD alternately.Utilize generic adaptation layer in conjunction with the driving of simplifying HCD, standard HCD then handles non-standard HC according to standard USB HC, thereby does not need to make any modification.
In addition; need to prove; general on the market standard HCD comprises OHCD and UHCD at present; characteristics at Embedded USB is used in the subsequent descriptions of the inventive method embodiment, adopt OHCD that the realization of generic adaptation layer is described; also can carry out as for design according to the step that present embodiment provides based on the generic adaptation layer of UHCD; but realize that details is comparatively complicated than the OHCD generic adaptation layer, its should contain with protection scope of the present invention in, do not given unnecessary details herein.
S402, the virtual register access interface that the virtual hardware register is read and write is set for simplifying HCD.
The OHCI standard is according to the bit position of little endian mode definition OHCI hardware register, the hardware register of non-standard HC then may be to read and write according to big end or little endian mode, therefore generic adaptation layer need encapsulate the read-write interface of the virtual OHCI hardware register of a cover, and offer the simplification HCD of non-standard HC, to shield the difference of big end pattern and little endian mode, can correctly visit the set virtual hardware register of step S401 thereby guarantee to simplify HCD, realize the reusability of generic adaptation layer simultaneously at the non-standard HC of difference.
S403, the data structure access interface is set the data structure that standard HCD is safeguarded is conducted interviews realize to simplify HCD.
The OHCI standard is according to ED (the Endpoint Descriptor of little endian mode definition standard, the end points describing word)+TD (Transfer Descriptor, the transmission describing word) the bit position in the data structure, for realizing the normal visit of OHCD to standard ED+TD, generic adaptation layer need encapsulate the read-write interface of a cover ED+TD data structure, and shield the difference of big end pattern and little endian mode, guarantee the reusability of generic adaptation layer.The simplification HCD of simple and easy driving is provided for non-standard HC, in conjunction with the generic adaptation layer that the standard data structure access interface is provided on it, can realize that non-standard HC carries out according to the regulation and the OHCD of OHCI standard alternately further by the ED+TD data structure of virtual hardware register and standard.
S404, the data transmission notice interface is set, by standard HCD when starting or stoping data transmission by this data transmission notice interface to simplifying the HCD notice.
The usb data transmission of OHCI normalized definition realizes, be to cooperate by OHCD and OHCI HC to finish, OHCD notifies the transmission of data by corresponding registers and ED+TD structure are set to OHCI HC, OHCI HC has detected data by poll and will transmit, then search for the ED+TD data structure, know the TD that needs transmission, further form the usb data bag and transmit.
As for the realization of non-standard HC data transmission, a part is similar to OHCI HC and knows the transmission of data by polling mode, thereby can realize by simplifying HCD poll accesses virtual hardware register and OHCD data structure.But a part then can't realize poll in addition, needs simplification HCD that particular register directly is set and starts transmission.Therefore, generic adaptation layer need provide data transmission startup/expiry notification interface, and selects whether to use this interface by simplifying HCD according to the concrete function of non-standard HC.
S405, initialization interface is set, is used for before standard HCD carries out initialization the virtual hardware register, simplifies HCD and HC carries out initialization.
The OHCD generic adaptation layer need add three and give the initialization interface of simplifying HCD in the OHCD initialization section.Be respectively applied for before the OHCD initialization, the virtual hardware register that is provided with among the initialization step S401, generic adaptation layer are simplified the initialization of HCD down, and the initialization of non-standard HC hardware.
S406, the hardware interrupts of standard definition is simulated, virtual interruption is set according to standard HCD.
OHCI has defined complete hardware interrupts, and plug and the usb data transmission of OHCI HC by those hardware interrupts notice OHCDUSB equipment such as finishes at incident.Each self-defining hardware interrupts of non-standard HC may be partly or entirely different with the hardware interrupts of OHCI definition, so OHCD common software adaptation layer need be simulated the hardware interrupts trigger of standard definition.When handling separately hardware interrupts, trigger corresponding OHCI software interruption by different non-standard HC according to the normative choice of OHCI.
S407, the virtual root hub interface is set, the Root Hub of standard definition is simulated, and select to call according to the Root Hub function of HC by simplifying HCD according to standard HCD.
OHCI regulation and stipulation HC integration section Root Hub function, OHCD has then defined a series of Root Hub related registers, is convenient to manage the management of Root Hub function.Being not quite similar of Root Hub function that non-standard HC is integrated and OHCI regulation and stipulation, the OHCD generic adaptation layer need provide the simulation of the complete integrated Root Hub of OHCI, is called according to the function selecting of the integrated Root Hub of concrete non-standard HC by different simplification HCD.Need to prove in addition, some off-gauge USB controllers need circumscribed USB PHY (Physical Layer, Physical layer) chip is realized the function of Root Hub, generic adaptation layer then can be considered as the combination of this type of non-standard HC+USB PHY chip inner integrated Root Hub, thereby handles by this step.
S408, HC utilize the driving of simplifying HCD, are undertaken alternately by generic adaptation layer and standard HCD.
After by step S401～S407 virtual the setting being carried out in hardware register, interface and the interruption etc. of standard HCD definition, promptly between standard HCD and simplification HCD, finish the realization of generic adaptation layer, further combined with the simplification HCD under it can finish non-standard HC according between existing standard and the standard HCD alternately, standard HCD also can be considered as non-standard HC standard OHCI USB HC it is handled.
The embodiment of the invention described above USB HCD generic adaptation layer implementation method, simulate by hardware register, data structure and access interface, hardware interrupts and Root Hub function standard definition, between standard HCD and simplification HCD, realize generic adaptation layer, can further combined with simplify HCD realize between HC and the standard HCD alternately, thereby realize the complete driving of non-standard HC, and simplify the workload of the driving design and development of non-standard HC; This generic adaptation layer also has the good advantage of reusability, is suitable for supporting simultaneously the realization of multiple non-standard HC, thereby effectively saves exploitation and maintenance cost.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (9)
1, a kind of usb host device comprises standard HCD unit, simplifies HCD unit and HC unit, it is characterized in that, also comprises the generic adaptation layer unit,
Described simplification HCD unit is for described HC unit provides driving;
Described generic adaptation layer unit is connected with described standard HCD unit, and for described simplification HCD unit provide virtual standard interface with realize described HC unit and described standard HCD unit alternately;
Described generic adaptation layer unit further comprises:
The virtual hardware register is connected with described simplification HCD unit and according to described standard HCD unit the hardware register of standard definition is simulated;
The virtual register access interface is connected with described virtual hardware register and provides the access interface that described virtual hardware register is read and write for described simplification HCD unit;
The data structure access interface is used to realize that described simplification HCD unit conducts interviews according to the data structure of described standard HCD unit to standard definition;
Virtual interruption subelement is connected with described standard HCD unit, is used for according to described standard HCD unit the hardware interrupts of standard definition being simulated.
2, usb host device according to claim 1, it is characterized in that, described generic adaptation layer unit also comprises the virtual root hub interface, according to described standard HCD unit the Root Hub of standard definition is simulated, and select to call according to the Root Hub function of described HC unit by described simplification HCD unit.
3, usb host device according to claim 1 is characterized in that described generic adaptation layer unit also comprises the transmission notice interface, is connected with described simplification HCD unit, is used for starting or stoping to described simplification HCD unit notification data transmission.
4, usb host device according to claim 1 is characterized in that described generic adaptation layer unit also comprises initialization interface, is connected with described simplification HCD unit, is used for described virtual hardware register, simplifies the HCD unit and the HC unit carries out initialization.
5, a kind of USB HCD generic adaptation layer implementation method is characterized in that, comprising:
According to described standard HCD the hardware register of standard definition is simulated, the virtual hardware register is set;
For described simplification HCD is provided with the virtual register access interface that described virtual hardware register is read and write;
The data structure access interface is set to conduct interviews to the data structure of standard definition according to described standard HCD to realize described simplification HCD;
According to described standard HCD the hardware interrupts of standard definition is simulated, virtual interruption is set;
HC utilizes the driving of described simplification HCD, is undertaken alternately by described generic adaptation layer and described standard HCD.
6, as USB HCD generic adaptation layer implementation method as described in the claim 5, it is characterized in that, describedly according to standard HCD generic adaptation layer be set and also comprise:
The virtual root hub interface is set, the Root Hub of standard definition is simulated, and select to call according to the Root Hub function of described HC by described simplification HCD according to described standard HCD.
7, as USB HCD generic adaptation layer implementation method as described in the claim 5, it is characterized in that, describedly according to standard HCD generic adaptation layer be set and also comprise:
The data transmission notice interface is set, is used for described standard HCD starting or stoping to described simplification HCD notification data transmission.
8, as USB HCD generic adaptation layer implementation method as described in the claim 5, it is characterized in that, describedly according to standard HCD generic adaptation layer be set and also comprise:
Initialization interface is set, is used for before described standard HCD carries out initialization, described virtual hardware register, simplification HCD and HC being carried out initialization.
9, as claim 5 to 8 USB HCD generic adaptation layer implementation method as described in each, it is characterized in that described standard HCD is OHCD or UHCD.
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| CN1529227A (en) * | 2003-09-29 | 2004-09-15 | 中兴通讯股份有限公司 | USB storage drive development method in embedding system |
| WO2004080745A1 (en) * | 2003-03-12 | 2004-09-23 | Robert Bosch Gmbh | Device for determining the driving path in adaptive cruise control systems for motor vehicles |
| WO2006091923A1 (en) * | 2005-02-25 | 2006-08-31 | Ip Infusion, Inc. | Hardware abstraction layer |
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| WO2004080745A1 (en) * | 2003-03-12 | 2004-09-23 | Robert Bosch Gmbh | Device for determining the driving path in adaptive cruise control systems for motor vehicles |
| CN1529227A (en) * | 2003-09-29 | 2004-09-15 | 中兴通讯股份有限公司 | USB storage drive development method in embedding system |
| WO2006091923A1 (en) * | 2005-02-25 | 2006-08-31 | Ip Infusion, Inc. | Hardware abstraction layer |
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