WO2013049980A1

WO2013049980A1 - Switching device and switching method

Info

Publication number: WO2013049980A1
Application number: PCT/CN2012/077546
Authority: WO
Inventors: 雷强
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-10-08
Filing date: 2012-06-26
Publication date: 2013-04-11
Also published as: CN102508810A; CN102508810B

Abstract

Disclosed are a switching device and switching method, the switching device comprising a connection management module, a power management module, a first interface and a second interface; the first interface and the second interface are respectively connected to a first DEVICE unit and a second DEVICE unit; the connection management module supports a host negotiation protocol and is used to transmit data between the first DEVICE unit and the second DEVICE unit; and the power management module supplies power for the connection management module, the first interface and the second interface respectively. The solution can interconnect the two USB DEVICE units, and support the mutual transfer and storage of the stored contents between the DEVICE units when the DEVICE unit storage capacity is full.

Description

Switching device and switching method

The present invention relates to the field of communications technologies, and in particular, to an adapter device and a switching method. Background technique

As a standard protocol interface, USB is a standard interface used by a variety of peripherals to support high-volume data transmission and support hot-swap. At present, due to the rapid development of the field of wireless communication, various communication devices, such as personal hand-held phones and tablet-type products, are increasingly used by users. The USB interface, with its standard and easy implementation, is also the preferred interface for these devices.

At present, many devices, such as digital cameras and MP4s, can only be used as slave devices (DEVICE devices). In normal work, when the storage space of these devices is full, they can be connected to storage devices such as PCs. But if you are outdoors, you can't store it. This requires a USB adapter to interconnect existing DEVICE devices. The current UFi (ULTRA wifi) products and mobile phones can only be used as DEVICE devices. If such a switching device is available, the storage contents of the DEVICE devices can be mutually transferred.

At present, although OTG (On-The-Go) digital products have appeared on the market, users have not been able to throw away their devices to buy new OTGs because consumer electronic products such as digital cameras and mobile phones have become popular. If the product has a switching device that interconnects the traditional DEVICE products, it will be more convenient and faster to transfer the storage contents of the DEVICE products. Summary of the invention

The object of the present invention is to provide an adapter device and a transfer method for implementing a DEVICE device The mutual transfer of stored content.

To achieve the above object, the present invention provides an adapter device, including: a connection management module, a power management module, a first interface, and a second interface;

The first interface and the second interface are respectively configured to connect the first slave device (the DEVICE device) and the second DEVICE device;

The connection management module supports a host circulation protocol for implementing data transmission between the first DEVICE device and the second DEVICE device;

The power management module supplies power to the connection management module, the first interface, and the second interface, respectively. Preferably, the switching device further includes a human machine interface, and the human machine interface provides a user operation interface and a status display interface.

Preferably, the status display interface is an LED light or an LCD.

Preferably, the first interface and the second interface respectively comprise an interface connector and have a current limiting function and an electrostatic discharge (ESD) function.

Preferably, the first interface and the second interface respectively supply current to the DEVICE device connected to the DEVICE device.

Preferably, the first interface and the second interface are a USB interface or a mini USB interface. The invention also provides a switching method, comprising: after the switching device having the first interface and the second interface is inserted into two slave devices (the DEVICE device), the switching device supplies power to the DEVICE device, enumerates and allocates Address; the DEVICE device saves the address and returns an acknowledgment to the switching device; the switching device acquires the complete descriptor of the DEVICE device and configures the DEVICE device; the data between the two DEVICE devices is dumped.

Preferably, the data transfer between the two DEVICE devices is controlled by a human machine interface. Preferably, the first interface and the second interface respectively comprise an interface connector, and have a current limiting function and an ESD function.

Preferably, the first interface and the second interface are a USB interface or a mini USB interface. In summary, the use of the present invention has the following beneficial effects:

The invention can realize the interconnection of two USB DEVICE devices at the same time, and can support the mutual transfer of the storage contents between the DEVICE devices when the storage capacity of the DEVICE device (for example, mobile digital products) is full. DRAWINGS

Figure 1 is a schematic diagram of a conventional DEVICE device connected to a HOST (host) device for data storage;

2 is a schematic diagram of a working connection mode of a USB switching device according to an embodiment of the present invention;

3 is a schematic structural diagram of a USB switching device according to an embodiment of the present invention;

4 is a schematic flow chart of a transit method according to an embodiment of the present invention. detailed description

The invention provides an adapter device, which can realize interconnection of two DEVICE devices, and can support mutual transfer of stored contents between DEVICE devices when the storage capacity of the DEVICE device (for example, a mobile digital product) is full.

The specific embodiments are described in detail below with reference to the accompanying drawings. In the following embodiments, the DEVICE device is described by taking a USB DEVICE device as an example. Correspondingly, in the following embodiments, the switching device is also illustrated by using a USB switching device. In other embodiments, the interface of the switching device may be Other types of interfaces such as mini USB.

As shown in Figure 1, an existing USB slave device (DEVICE device) can only be connected to a host (HOST) device such as a PC for data storage.

As shown in FIG. 2, it is a schematic diagram of the working connection mode of the USB switching device according to the embodiment of the present invention. Through the USB switching device, two DEVICE devices (A, B) can be interconnected through two Host interfaces.

As shown in FIG. 3, it is a schematic structural diagram of a USB switching device according to an embodiment of the present invention, which mainly includes: USB connection management module, power management module, human machine interface, first USB interface and second USB interface. The first USB interface and the second USB interface are respectively used for the first DEVICE device and the second DEVICE device; the first USB interface and the second USB interface may be referred to as a USB interface module.

USB connection management module: USB connection management module supports host distribution protocol (Host

Negotiation Protocol, HNP), supports the transfer of data between two DEVICE devices. Used to provide two USB Host interfaces.

The power management module: respectively supplies power to the USB connection management module, the first USB interface, the second USB interface, and the human interface, wherein the first USB interface and the second USB interface respectively supply current to the first DEVICE device and the second DEVICE device. The power supply can be used with a rechargeable dry battery.

Man-machine interface: Provide user operation interface and status display interface for human-computer interaction. The status display interface can be realized by LED light or LCD.

The first USB interface and the second USB interface: the USB interface provides a USB current limiting function, an Electro-Static discharge (ESD) function, and an interface connector, and the first USB interface and the second USB interface are respectively connected to the first DEVICE device And the second DEVICE device.

The above USB connection management module includes: a hardware sub-module and a software sub-module.

The hardware sub-modules include: processor, USB host controller (actually many processors currently include USB host controller), root hub (often integrated in the USB host controller), flash memory and synchronous dynamic random access memory ( SDRAM, Synchronous Dynamic Random Access Memory) ₀ , the processor can be selected with a USB Host*2 (MCU, Micro Control Unit integrated in the MCU), or MCU+USB (refers to the integration of a USB controller inside the MCU) controller implementation. The MCU has a certain amount of flash and random access memory (RAM), and can also expand external flash and SDRAM.

Software sub-modules include: USB client driver, USB driver and USB host control Driver. The application's transaction is that the USB client driver treats the USB device as an accessible set of endpoints at startup, and can control and communicate with the functional unit of the USB device. The USB system software includes a USB driver and a USB host controller driver. The USB driver is responsible for configuration management, user management, bus management, and data transfer management, as well as bit encoding, packetization, loop checking, sending, error handling, and more.

The USB Connection Management Module contains the necessary General Purpose Input Output (GPIO) interface. The GPIO interface integrates the USB Host*2 interface with a memory management interface.

The power supply can be powered by a rechargeable dry battery. It is divided into two channels, one 3.3V to the USB connection management module and the human interface, and the other 5 V to the USB interface module (the first USB interface and the second USB interface).

In addition, in the human-machine interface, human-computer interaction is realized by GPIO controlling LED lights or low-cost LCDs and simple buttons.

The USB interface part requires a finite current circuit and an ESD protection circuit, and the D+ and D- interfaces are respectively connected to a 15K ohm pull-down resistor.

When the USB DEVICE device is plugged into the USB adapter, the 5V voltage is supplied by the USB adapter. Since the USB DEVICE device is connected to a 1.5K pull-up resistor on D+ and D-, respectively, when the D+ and D- correspond to the 1.5K pull-up. When the resistance is high, confirm that the USB DEVICE device is plugged in.

The USB DEVICE device is enumerated through the USB connection management module, and data can be transmitted through the human-machine interface.

The implementation of the human-machine interface can be extended to three types depending on the operation mode: the default master-slave mode, the button selection master-slave mode, and the screen-operable mode.

1. Default master-slave mode: Considering the cost factor, the default master-slave mode can be adopted. In this mode, the human-machine interface only has the LED light to indicate the function. The default data transmission direction when working, the first USB interface is defined as the main interface. The second USB interface is a slave interface, the user cannot make a selection, and the whole The data of the disk is copied. The whole transmission process can be displayed by LED. If the enumeration is successful, the green light is always on, the green light flashes quickly during the transmission process, and the green light is returned to the steady light when the transmission is successful.

2. Select the master-slave mode by pressing the button: Compatible with cost and operability, you can use the button to select the data transmission direction. In this mode, the man-machine interface includes buttons and LED lights, and the buttons can switch the data transmission direction. The A device is transmitted to the B device, or the B device is transmitted to the A device, which increases the user's satisfaction. The whole transmission process is still displayed by LED lights. If the enumeration is successful, the green light is always on, the green light flashes quickly during the transmission process, and the green light is always on when the transmission is successful.

3, with screen operable mode: Considering the convenience of the user, you can add a display on the human-machine interface for display, B device's current storage status, select the content to be copied by pressing the button, or Select the direction in which data is transferred by pressing the button. The entire transfer process can be displayed through the display.

Referring to FIG. 4, it is a schematic flowchart of a transit method according to an embodiment of the present invention, which includes the following steps:

S401: The switching device is initialized;

When powering up or initializing, first reset the USB host controller, initialize the hardware configuration, set the terminal, set the Buffer size, and so on. Put the USB host controller in the correct working state. The data that is actually being used to send to the bus is placed in the buffer.

S402: determining whether the pull-up level is high, if it is high, proceeding to step S403, if not, repeating the determination;

First, capture the insertion of the DEVICE device. The DEVICE device (for USB devices) is a plug-and-play device. The adapter device captures this information at the moment the DEVICE device is plugged in. The D+ and D- of the USB interface of the adapter device have a pull-down resistor of 15k ohms. . The DEVICE device has a 1.5K pull-up resistor on D+ or D-, respectively. When the DEVICE device is plugged into the USB interface of the switching device, the switching device first determines the level of the pull-up resistor corresponding to D+ or D- to determine whether the DEVICE device is plugged in. S403: confirm that the device is inserted;

If the level of the corresponding pull-up resistor on the D+ or D- of the DEVICE device is high, the DEVICE device reports the high level signal to the USB host controller, and then the interface of the processor generates an interrupt signal. Confirm the device is plugged in.

S404: reading a device register;

After the switch receives the interrupt, it reads information about the DEVICE device speed by reading the relevant registers.

S405: determining whether it is a new device, if yes, proceeding to step S406, if not, proceeding to step S413;

The switching device determines whether it is a new device by reading the DEVICE device related register. If it is a new device, go to step 406 and restart the USB interface of the DEVICE device. If it is a registered device, go directly to step 413 and the DEVICE device enters an operational state.

S406: The USB interface of the device is restarted;

The switching device sets the relevant registers so that the USB cable of the DEVICE device is in the restart state (D+, D- are both logic low).

S407: delay 10ms;

S408: Complete the enumeration;

Then the transfer device releases the restart state and the DEVICE device is in the default state. At this point, the DEVICE device is ready to send a default flow through the Endpoint 0 breakpoint to respond to the control flow of the transit device. The switching device completes the enumeration of the DEVICE device by controlling the transmission channel.

S409: The switching device allocates an address to the new device;

The switching device first sends a Get_Descriptor request to the DEVICE device to know the size of the maximum packet of Endpoint 0, and then the switching device sends a request to the DEVICE device to assign address 0, endpoint 0 to the new device. A separate address is then assigned to the DEVICE device by sending a Set_Address request. S410: The new device returns and confirms the save address;

The DEVICE device reads the Set_Address request, returns a confirmation and saves the new address. S411: The transfer device acquires a complete descriptor of the new device;

After the transfer device knows the capabilities of the DEVICE device, the transfer device sends a Get_Descriptor request to the new address to read the complete descriptor of the DEVICE device, including the maximum size of the Endpoint 0 package, the configuration number supported by the DEVICE device, and the DEVICE device. Other letters

S412: The switching device configures the new device;

The adapter sets (Set-configuration) to set the configuration request, and configures the DEVICE device with the above configuration number.

S413: The device enters an operable state;

At this point, the DEVICE device is fully operational.

S414: Select an operation mode through different human-machine interfaces;

After entering the operational state, data copy between the two DEVICE devices can be realized through the human machine interface.

Of course, the present invention may be embodied in various other modifications and changes without departing from the spirit and scope of the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles are intended to be included within the scope of the present invention.

Claims

A switching device, wherein the switching device comprises: a connection management module, a power management module, a first interface, and a second interface;

The power management module supplies power to the connection management module, the first interface, and the second interface, respectively.

2. The device according to claim 1, wherein the switching device further comprises a human machine interface, and the human machine interface provides a user operation interface and a status display interface.

3. Apparatus according to claim 2, wherein said status display interface is an LED light or an LCD.

4. The apparatus according to claim 1, wherein the first interface and the second interface respectively comprise an interface connector, and have a current limiting function and an electrostatic discharge (ESD) function.

5. The apparatus of claim 1, wherein the first interface and the second interface respectively supply current to a DEVICE device connected to itself.

6. The apparatus of claim 1, wherein the first interface and the second interface are a USB interface or a mini USB interface.

A switching method, wherein the method comprises: after the switching device having the first interface and the second interface is inserted into two slave devices (the DEVICE device), the switching device supplies power to the DEVICE device, and performs the And assigning an address; the DEVICE device saves the address and returns an acknowledgment to the switching device; the switching device acquires the complete descriptor of the DEVICE device and configures the DEVICE device; the data between the two DEVICE devices is dumped.

8. The method of claim 7, wherein the data transfer between the two DEVICE devices is controlled by a human machine interface.

9. The method according to claim 7, wherein the first interface and the second interface respectively comprise an interface connector, and have a current limiting function and an ESD function.

10. The method according to claim 7, wherein the first interface and the second interface are a USB interface or a mini USB interface.