WO2022178882A1

WO2022178882A1 - Usb-based communication method and apparatus

Info

Publication number: WO2022178882A1
Application number: PCT/CN2021/078314
Authority: WO
Inventors: 吴凯杰; 伍东兴
Original assignee: 华为技术有限公司
Priority date: 2021-02-27
Filing date: 2021-02-27
Publication date: 2022-09-01
Also published as: CN116601618A

Abstract

Disclosed in the present application is a USB-based communication method and apparatus for improving the reliability of USB control transmission. A USB peripheral can receive a setup packet from a USB host at different times; the USB peripheral generates a unique serial number for each received setup packet, associates each setup packet with its corresponding serial number, and associates the serial number corresponding to each setup packet with a data packet to be transmitted in the control transmission initiated by each setup packet; and after the data transmission phase of any control transmission starts, the USB peripheral is configured to transmit the data packet to be transmitted in the control transmission with the USB host after determining that the serial number corresponding to the data packet to be transmitted in the control transmission is consistent with the serial number corresponding to the latest received setup packet of the USB peripheral. In this way, the USB peripheral can ensure the correspondence between the data packet and the setup packet, to avoid the occurrence of wrong packet transmission, thereby improving the reliability of the USB control transmission.

Description

A USB-based communication method and device

technical field

The present application relates to the field of computer technology, and in particular, to a communication method and device based on Universal Serial Bus (USB).

Background technique

The USB communication protocol adopts a master-slave structure to realize the communication between a USB host and a USB peripheral (or referred to as a USB slave device, a USB peripheral device, a USB device, etc.). All transactions (data stream transmission) on the USB bus are actively initiated by the USB host, while the USB peripherals passively receive and process various commands (requests) sent by the USB host. The USB communication protocol has four modes for transferring data: control transfer, bulk transfer, interrupt transfer and isochronous transfer. Among them, the control transmission is used to transmit control, status, configuration and other information between the USB host and the USB peripheral. A complete control transfer includes 2 to 3 phases: setup phase, data phase and status phase, wherein the data phase is optional. The control transfer is initiated by the USB host through the setup packet. After the USB peripheral receives the setup packet sent by the USB host, it considers that a new control transfer starts.

In the prior art, the USB host often initiates a new control transfer before the last control transfer is completed, and the USB peripheral cannot recognize the difference between the setup packet and the data packet/status packet in different control transfers. The corresponding relationship, resulting in the phenomenon of wrong packet transmission.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a USB-based communication method and device, which are used to improve the reliability of USB control transmission.

In a first aspect, a USB-based communication method is provided, and the method can be applied to a USB peripheral device, and the USB peripheral device is communicatively connected to a USB host through a USB bus. The method includes: the USB peripheral device receives establishment packets from the USB host at different times, and any one of the establishment packets is used to initiate a corresponding control transmission; the USB peripheral device generates a unique number for each establishment packet that has been received, and Associate each establishment packet with its corresponding number, and associate the corresponding number of each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet; start at the data transmission phase of any control transmission After the USB peripheral determines that the number corresponding to the data packet to be transmitted in any control transmission is consistent with the number corresponding to the establishment packet recently received by the USB peripheral, the USB peripheral transmits the pending control transmission to the USB host. transmitted packets.

The USB peripheral device in the embodiment of the present application generates a unique number for each setup packet received, and when preparing the transmission of the data packet, the data packet is attached with the number of the setup packet corresponding to the current pen control transmission, and is added to the data packet in the data packet. The number verification is performed before the packet is transmitted. Only after the corresponding number of the data packet is consistent with the number of the newly received establishment packet, the USB peripheral will start to transmit the data packet, so as to ensure the corresponding relationship between the data packet and the establishment packet and avoid wrong packets. The occurrence of transmission, thereby improving the reliability of USB control transmission.

In a possible implementation manner, the USB peripheral device needs to allocate at least one event buffer space before associating each establishment packet with its corresponding serial number. Correspondingly, associating each establishment packet with its corresponding serial number by the USB peripheral includes: storing each establishment packet and its corresponding serial number in the same event buffer space.

In this embodiment, the USB peripheral stores the establishment packet in the event cache space, so that the cache space for storing the establishment packet (ie the event cache space) and the cache space for storing the data packet (ie the data cache space) are independent of each other and do not interfere with each other. In turn, the packet loss phenomenon can be improved, and the reliability of USB control transmission can be further improved.

In a possible implementation, there are multiple event buffer spaces allocated by the USB peripheral device; the USB peripheral device can store the multiple establishment packets and corresponding numbers received at different times in turn according to the time sequence of receiving the establishment packets. into the allocated multiple event buffer spaces.

In this embodiment, the USB peripheral allocates multiple event buffer spaces at one time, which can reduce the frequency of allocating buffers by the USB peripheral, that is, reduce the software and hardware interaction of the USB peripheral, and improve the efficiency of USB control transmission.

In a possible implementation manner, the USB peripheral stores each establishment packet and its corresponding number in the same event buffer space, which may include: if there is free event buffer space in at least one event buffer space, then store each The establishment packets and their corresponding numbers are stored in the free event buffer space; if there is no free event buffer space in at least one event buffer space, the N establishment packets received at different times and their corresponding numbers are used to replace at least one of them respectively. The history numbers stored in the event buffer space are from old to new N establishment packets and corresponding numbers in the event buffer space, where N is a positive integer.

In this embodiment, the event buffer space of the USB peripheral provides an overwrite function. When there is no free event buffer space, a new establishment packet can be used to replace the old establishment packet, thus ensuring that the USB peripheral can receive and save at any time. The new setup package can better avoid the occurrence of packet loss.

In a possible implementation manner, if there is no free event buffer space in the at least one event buffer space, the specific way for the USB peripheral to store each establishment packet and its corresponding number in the same event buffer space includes the following: Two kinds:

Mode 1. When there is no free event buffer space in at least one event buffer space, the USB peripheral clears all event buffer spaces in at least one event buffer space; The N establishment packets and corresponding serial numbers received by time are sequentially stored in the cleared N event buffer spaces; wherein, N is a positive integer. That is, the USB peripheral empties all the event buffer space at one time, and then uses the emptied event buffer space as the newly allocated event buffer space.

Mode 2. When there is no free event buffer space in at least one event buffer space, the USB peripheral device clears one event buffer in the at least one event buffer space after receiving the i-th establishment packet in the N establishment packets Space; store the i-th establishment packet and the corresponding number in the empty event buffer space, and i is a positive integer from 1 to N; wherein, N is a positive integer. That is, the USB peripheral empties a historical establishment packet after receiving a new establishment packet.

It should be understood that in mode 2, the one event buffer space may be any one of the at least one event buffer space. Optionally, before clearing, the one event buffer space stores: the establishment packet with the earliest reception time among the received establishment packets, or the smallest number or the largest number among the numbers corresponding to the received establishment packets.

It should be understood that the above two manners are only examples and not limitations.

In a possible implementation manner, after the USB peripheral associates each establishment packet with its corresponding number, and associates the corresponding number of each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet. Before the connection, it also parses the content of each establishment packet to obtain the size of the data packet to be transmitted in the control transmission initiated by each establishment packet (optionally, the data to be transmitted in the control transmission initiated by each establishment packet can also be obtained. content and direction of the packet); according to the size of the data packet to be transmitted, a data buffer space is allocated for the data packet to be transmitted in the control transmission initiated by each setup packet.

It should be understood that if the data phase of this arbitrary control transmission is IN transmission; then the USB peripheral device allocates data buffer space for the data packet to be transmitted in the control transmission initiated by each establishment packet according to the size, and in any Before the start of the data phase of the control transmission, a data packet to be transmitted in any one of the control transmissions can also be prepared according to the content, and the to-be-transmitted data packet is stored in the data buffer space. In this way, the reliability of USB control transmission can be improved.

In a possible implementation, the USB peripheral associating the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet includes: for any establishment packet, the any establishment packet is The corresponding number and the data packet to be transmitted in the control transmission initiated by any establishment packet are stored in the data buffer space allocated for the data packet to be transmitted in the control transmission initiated by any establishment packet.

The following describes the specific implementation process of the data phase of control transmission in the two scenarios of OUT transmission and IN transmission.

Case 1. The data phase of any control transfer is OUT transfer (that is, the USB host sends a data packet to the USB peripheral).

The USB peripheral receives the data packet from the USB host; after the USB peripheral determines that the number corresponding to the data packet to be transmitted in any control transfer is consistent with the number corresponding to the latest establishment packet received by the USB peripheral, the received The data packets are stored in the data buffer space allocated for the data packets to be transmitted in the arbitrary control transmission.

Case 2. The data phase of any control transmission is IN transmission (that is, the USB peripheral sends data packets to the USB host);

After the start of the data phase of the arbitrary control transfer, the USB peripheral receives a data packet request from the USB host, and the data packet request is used to request the USB peripheral to send a data packet; after determining that the arbitrary control transmission is to be transmitted After the number corresponding to the data packet is consistent with the number corresponding to the establishment packet newly received by the USB peripheral, read data from the data buffer space allocated for the data packet to be transmitted in any control transmission according to the data packet request. packet and send to the USB host.

In a possible implementation manner, after the USB peripheral device associates the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet, it can also associate the corresponding number of each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet. A status packet in a control transfer initiated by each setup packet is associated. Then, after the data phase of any control transfer ends, the USB peripheral receives a status packet request from the USB host (the status packet request is used to request the USB peripheral to send a status packet), and the USB peripheral determines any control transfer. Only after the number corresponding to the status packet in the transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral device, the status packet to be transmitted in the arbitrary control transmission is sent to the USB host.

In this embodiment, the USB peripheral also performs number verification before transmitting the status packet, and only after the number corresponding to the status packet is consistent with the number of the newly received establishment packet, the USB peripheral starts to transmit the status packet. This ensures that The corresponding relationship between the status packet and the establishment packet avoids the occurrence of wrong packet transmission, and further improves the reliability of USB control transmission.

In a second aspect, a USB-based communication device is provided, which can be applied to a USB peripheral device, and the USB peripheral device and a USB host are communicatively connected through a USB bus; the device includes a device for implementing the first aspect or any one of the first aspects. modules/units of the method described in a possible embodiment.

Exemplarily, the device may include: a USB interface module for respectively receiving establishment packets from the USB host at different times, wherein any establishment packet is used for initiating a corresponding control transmission; Each establishment packet received generates a unique number, and each establishment packet is associated with its corresponding number; the main control module is used to associate the corresponding number of each establishment packet with the control transmission initiated by each establishment packet to be transmitted. The interface control module can also be used to determine the number corresponding to the data packet to be transmitted in any control transmission and the latest received by the USB peripheral after the data transmission phase of any control transmission starts. After the numbers corresponding to the established packets are consistent, the USB interface module and the USB host are controlled to transmit any data packet to be transmitted in the control transmission.

A third aspect provides a computer-readable storage medium storing computer program instructions that, when executed, cause the method described in the first aspect or any possible implementation manner of the first aspect to be executed. accomplish.

A fourth aspect provides a chip, which can be coupled with a memory, and is used for reading and executing program instructions stored in the memory, so as to achieve the above-mentioned first aspect or any possible implementation manner of the first aspect. method described.

In a fifth aspect, a computer program product is provided, the computer program product has instructions stored in the computer program product, when the computer program product is run on a computer, the computer causes the computer to execute the above-mentioned first aspect or any one of possible implementations of the first aspect. method.

For the technical effects that can be achieved by any one of the above-mentioned second aspect to the fifth aspect and the possible designs in any of them, please refer to the description of the technical effects that can be achieved by the above-mentioned first aspect and its corresponding possible designs, which will not be repeated here. Repeat.

Description of drawings

FIG. 1 is a schematic diagram of a USB communication scenario applicable to an embodiment of the present application;

2A to 2D are schematic structural diagrams of a USB peripheral device 4 to which the solution provided by the embodiment of the present application is applicable;

3 is a flowchart of a method based on USB communication provided by an embodiment of the present application;

4 is a flowchart of another method based on USB communication provided by an embodiment of the present application;

5 is a flowchart of another method based on USB communication provided by an embodiment of the present application;

FIG. 6 is a flowchart of another method based on USB communication provided by an embodiment of the present application.

Detailed ways

USB technology is usually used in data transmission of various electronic devices. For example, electronic devices can be charged by connecting to a power source through USB technology, and data transmission between one electronic device and another electronic device can also be performed through USB technology, such as video or picture. transmission sharing, etc.

The technical solutions provided in the embodiments of the present application can be applied to various USB communication scenarios. As shown in FIG. 1 , a USB host and a USB peripheral can be connected through a USB bus to implement USB communication. In some possible embodiments, the USB host and the USB peripheral may be directly connected by a cable. In other possible embodiments, other devices may also be set between the USB host and the USB peripheral, which is not limited here. For example, a USB hub may also be provided, the USB host and the USB peripheral are respectively connected to the USB hub through cables, and the USB host, the USB peripheral and the USB hub are all connected on the USB bus.

Generally, the USB communication protocol supports four modes of data transfer between the USB host and the USB peripheral, namely: control transfer, bulk transfer, interrupt transfer and isochronous transfer. Among them, the control transmission is used to transmit control, status, configuration and other information between the USB host and the USB peripheral. Generally, a complete control transfer includes 2 to 3 phases: a setup phase, a data phase, and a status phase. Among them, the data stage is optional. The control transfer is initiated by the USB host by sending a setup packet to the USB peripheral. After the USB peripheral receives the setup packet sent by the USB host, it considers that a new control transfer begins.

Further, the control transmission on the USB host and the USB peripheral is divided according to the transmission direction of the data packet in the data phase, and may include two types of control OUT transmission and control IN transmission. Among them, controlling OUT transmission means that the USB host sends data packets to the USB peripheral; controlling IN transmission means that the USB peripheral sends data packets to the USB host.

In the current solution, when a control transfer is performed between the USB host and the USB peripheral, each control transfer requires the USB peripheral to allocate a buffer space in advance in order to receive the setup packet in the control transfer, which will cause the USB peripheral to The interaction of software and hardware is cumbersome, and the efficiency of USB control transmission is low. In addition, since the storage locations of the setup package and the data package on the USB peripheral are in the data cache space, when the USB peripheral is allocated in the cache, the cache of the setup package and the cache of the data package are in competition, and the USB peripheral cannot Read/write the setup packet and the data packet at the same time. These reasons may cause the cache space to be allocated untimely, resulting in packet loss. For example, after the USB host sends a setup packet to the USB peripheral, if the USB peripheral has not allocated the data cache space for storing the setup packet, the setup packet cannot be stored, and the setup packet is discarded; If the setup packet is not stored successfully, the USB peripheral cannot allocate data buffer space in advance for the data packet to be transmitted in the data phase. Transmission failed.

In another case, the USB host initiates a new control transfer before the previous control transfer is completed. In this case, the setup packet, data or status packet in different control transfers before and after will appear on the USB peripheral. , and the USB peripheral cannot determine the correspondence between the setup packet and the data/status packet in different pen control transmissions, and will mistakenly reply the last data packet to the USB host, resulting in the occurrence of wrong packets.

In order to solve one or more of the above problems, embodiments of the present application provide a USB-based communication solution. In this embodiment of the present application, after each USB peripheral receives a setup packet, the USB peripheral can generate a unique number for the setup packet (or for the control transmission initiated by the setup packet), and associate the number with the setup packet. Packet association; when the USB peripheral prepares the transmission of the data packet/status packet, it needs to attach (or associate) the data packet/status packet with the number of the setup packet corresponding to the current pen control transmission (that is, with the data packet/status packet). The number of the setup package corresponding to the package), and the number check is performed before transmission; only after the number attached to the data package/status package is consistent with the number of the newly received setup package, the USB peripheral starts to transmit the data/status package. , so that the occurrence of wrong packet transmission can be avoided and the reliability of USB control transmission can be improved.

In the embodiment of the present application, the USB peripheral can also store the setup package in the event cache space and store the data package in the data cache space, so that the cache spaces used by the setup package and the data package are independent of each other and do not interfere with each other, which can improve the Packet loss phenomenon, improve the reliability of USB control transmission.

In this embodiment of the present application, the USB peripheral device may also allocate multiple cache spaces for storing setup packets in advance, and store the setup packets from the USB host in the order in which the setup packets are received, thus reducing the allocation of cache spaces for USB peripheral devices The frequency of USB peripherals is reduced, that is, the software and hardware interaction of USB peripherals is reduced, and the efficiency of USB control transmission is improved.

In the embodiment of the present application, the USB peripheral can also provide a cache coverage function. After the USB peripheral receives the setup package, if the USB peripheral has not allocated a cache space for storing the setup package, but the USB peripheral has If the cache space of the historical setup package ("historical setup package" refers to the previously received setup package) is stored, the historical setup package can be replaced with the setup package. In this way, even if there is no free cache space, the USB peripherals can Receive and save new setup packets at any time to avoid packet loss.

The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 2A , the embodiment of the present application provides a schematic structural diagram of a USB peripheral 4 to which the solution can be applied, including an interface control module 41 , a main control module 42 , a cache module 43 and a USB interface module 44 .

The USB interface module 44 is a physical interface (ie, a USB socket) of the USB peripheral device 4, and can be inserted into a USB data cable. The data from the USB host arrives at the USB peripheral 4 through the USB socket of the USB host, the USB data cable and the USB interface module 44 in turn. Correspondingly, the data sent by the USB peripheral 4 to the USB host finally passes through the USB interface module 44, the USB interface module 44 and the USB interface module 44. The data cable, and the USB socket of the USB host reach the USB host. The USB interface module 44 may be an interface conforming to the USB standard specification, and specifically may be a Mini USB interface, a Micro USB interface, a USB Type C interface, and the like. The USB interface module 44 can be used to connect a charger to charge the electronic device, and can also be used to transmit data between the electronic device and other peripheral devices (such as a USB host). It can also be used to connect headphones to play audio through the headphones.

The interface control module 41 is connected to the USB interface module 44 and the USB main control module 42 , and the interface control module 41 is responsible for data transmission control on the USB interface module 44 . For example, the data packet to be sent to the USB host is read from the cache module 43 and sent through the USB interface 44 , and the data packet received by the USB interface 44 from the USB host is stored in the cache module 43 . In the embodiment of the present application, the USB interface control module 41 not only performs data reading and writing in the cache module 43 , but also adds other functions, such as generating a corresponding number for each control transmission and reporting events to the main control module 42 . , Before transmitting data packets and/or status packets, perform number check, etc.

The cache module 43 has a cache space, and the cache space may specifically be a computer readable and writable storage medium for storing the data received by the USB peripheral device 4 from the USB host and the data to be sent. In the embodiment of the present application, the cache space is divided into two types: event cache space and data cache space, wherein the event cache space can be used to store the setup package in the establishment stage, and the data cache space can be used to store the data package in the data stage.

The data cache space is a cache space for storing data, for example, the data package in the data storage stage, the status package in the status stage, and the like. The event buffer space is the buffer space used to store events, such as the event of receiving the setup package, the event of the completion of data transmission, etc. It should be noted that, in the embodiment of the present application, the setup package belonging to the data is stored in the event cache space, which is different from the prior art where the setup package is stored in the data cache space, so that the interface control module 41 can access the data cache space and the event at the same time. The cache space, that is, the read and write of the setup package and the read and write of the data package are independent of each other, and the allocation of the cache space of the two is also independent of each other.

The main control module 42 is the main control center of the USB peripheral 4. The main control module 42 can perform one or more of the following functions: control the data phase, start/end the status phase, allocate event buffer space, allocate data buffer space, and the like. The main control module 42 can also be integrated in the interface control module 41. For example, if the interface control module 41 is a USB controller, and the USB controller has a separate MCU or MPU, the main control module 41 can pass the USB controller. MCU or MPU in the implementation.

The main control module 42 may integrate driver software supporting the USB protocol. Optionally, client software (or an upper-layer application) is also integrated on the main control module 42 . The driver software is a special program that can make the computer and hardware communicate with each other, which is equivalent to the interface of the hardware, and the client software controls the work of the hardware through the interface. In other words, the client software is the upper-layer software of the driver software. The client software cannot directly interact with other hardware of the USB peripheral 4. It needs to pass the instruction to the driver software, and then the driver software calls the hardware in the USB peripheral 4 to execute the corresponding operation. Correspondingly, the signal reported by the hardware in the USB peripheral 4 also needs to be packaged to the driver software first, and then transmitted by the driver software to the client software. Various functions performed by the main control module 42 can be implemented by running driver software and client software.

Each module can be further subdivided according to the functions performed by each module. For example, as shown in FIG. 2B, the cache module 43 includes an event cache space 431 and a data cache space 432, etc.; the interface control module 41 includes a number generation sub-module 411, an event reporting sub-module 412, a number check sub-module 413, etc., wherein the number generation sub-module 413, etc. The module 411 can be used to generate a corresponding number for each control transmission, and the event reporting sub-module 412 can be used to report the event to the main control module 42 (for example, notifying the main control module 42 of the event of receiving the setup package and/or the event of the generation number) , the number check sub-module 413 can be used to perform number check in the data phase and the status phase. Of course, there may also be other division manners in practical applications, which are not limited in this application.

In a specific implementation, the main control module 42 may specifically be, but is not limited to: a central processing unit (Central Processing Unit, CPU), a microcontroller unit (Micro Controller Unit, MCU), a microprocessor unit (Micro Processor Unit, MPU) ), digital signal processing (Digital Signal Processing/Processor, DSP), Field Programmable Gate Array (Field Programmable Gate Array, FPGA), etc. The cache module 43 can be, but is not limited to: a register, a first-in first-out (First Input First Output, FIFO) memory, a static random access memory (Static Random Access Memory, SRAM), a dynamic random access memory (Dynamic Random Access Memory, DRAM) and the like. The interface control module 41 may specifically be, but is not limited to, a logic circuit connected to the cache module 43 and the main control module 42 .

It should be noted that the interface control module 41 , the main control module 42 and the cache module 43 may be integrated in the same chip or in different chips, which is not limited in this application. For example, as shown in FIG. 2C, the interface control module 41, the main control module 42 and the cache module 43 are all integrated in the USB controller, wherein the specific implementation of the cache module 43 may be a register or FIFO memory or SRAM integrated in the USB controller) etc. (USB interface module 44 is not shown in FIG. 2C). Or for example, as shown in FIG. 2D, the interface control module 41 and the main control module 42 are integrated in the USB controller, and the cache module 43 is SRAM or DRAM, which is a part of the data memory outside the USB controller (the USB interface module in FIG. 2D). 44 not shown). Of course, the interface control module 41 and the main control module 42 can also be provided separately, for example, the interface control module 41 is integrated in the USB controller, and the main control module 42 is integrated in the CPU.

It should be noted that, in practical applications, the USB peripheral 4 may further include more modules than those shown in FIGS. 2A to 2D , for example, may also include one or more hubs, which are not shown in this application.

In the embodiment of the present application, the USB peripheral device 4 may specifically be, but not limited to, a U disk, an audio, a mouse, a keyboard, a computer, a mobile phone, a smart wearable device, a vehicle-mounted device, and the like.

Referring to FIG. 3 , a method based on USB communication provided by an embodiment of the present application, taking the method applied to the USB peripheral device in FIG. 2A as an example, the method includes:

S600, the main control module 42 allocates at least two event buffer spaces, and notifies the interface control module 41 of the first address of the allocated event buffer spaces;

In FIG. 3 , the allocation of two event buffer spaces is taken as an example. In practical applications, there may be more, such as three, four, five, etc., which are not limited in this application.

When the interface control module 41 stores the setup packet in the later stage, it can start from the first address and store the setup packet in sequence.

S601, the USB interface module 44 receives the first setup package from the USB host, and the first setup package is used to indicate the start of the first control transmission; the interface control module 41 stores the first setup package in the first event buffer space;

It should be noted that, due to the space limitation of the drawings, in order to clearly show the drawings, the USB interface module 44 is not shown in FIG. 3, but there is a USB interface module 44 between the actual interface control module 41 and the USB host. The peripheral device finally sends data to the external device (such as a USB host) through the USB interface module 44 and receives the data sent by the external device.

S602, the interface control module 41 reports an event to notify the main control module 42;

Specifically, the specific manner in which the interface control module 41 reports the event may be a manner of generating a hardware interrupt, for example, generating a setup interrupt signal.

S603. After receiving the notification, the main control module 42 reads the content of the last (or the latest) setup package from the first event buffer space, for example, reads and parses the content of the first setup package, and learns the data package to be transmitted size, content and orientation;

S604, the main control module 42 allocates the first data buffer space according to the size of the data packet to be transmitted, and notifies the interface control module 41 of the first address of the first data buffer space;

It should be understood that, if it is to control IN transmission, the main control module 42 also prepares the data packet according to the content of the data packet to be transmitted, and stores the data packet in the first data buffer space. The storage method can be stored sequentially from the first address.

S605, data packet transmission;

If it is the control OUT transmission, the USB interface module 44 receives the data packet from the USB host; the interface control module 41 stores the data packet received by the USB interface module 44 in the first data buffer space; if it is the control IN transmission, the USB interface The interface module 44 receives the data packet request from the USB host, and the interface control module 41 takes out the data packet from the first data buffer space and sends the data packet to the USB host through the USB interface module 44 .

S606, status packet transmission;

The main control module 42 sends the status packet to the interface control module 41 ; after the USB interface module 44 receives the status packet request from the USB host, the interface control module 41 returns the status packet to the USB host through the USB interface module 44 .

The main control module 42 can deliver a status packet to the interface control module 41 in various ways, which is not limited in this application. For example, the status packet is directly transferred to the interface control module 41; or, for example, the status packet is stored in the first data buffer space, and then the interface control module 41 reads the status packet from the first data buffer space; or, for example, the status packet is stored in the first data buffer space. into other data buffer spaces, and then the interface control module 41 reads the status packet from the other data buffer spaces.

So far, the first control transmission is completed.

S601', the USB interface module 44 receives the second setup package from the USB host, and the second setup package is used to indicate the start of the second control transmission; the interface control module 41 stores the second setup package in the second event buffer space;

S602', the interface control module 41 reports the event to notify the main control module 42;

S603'. After receiving the notification, the main control module 42 reads and parses the content of the last (or the latest) setup package from the second event buffer space, for example, reads and parses the content of the second setup package to obtain the content to be transmitted. The size, content and orientation of the data package;

S604', the main control module 42 allocates the second data buffer space according to the size of the data packet to be transmitted, and notifies the interface control module 41 of the first address of the second data buffer space;

Similarly, if it is to control IN transmission, the main control module 42 also prepares the data packet according to the content of the data packet to be transmitted, and stores the data packet in the second data buffer space.

S605', data packet transmission;

If it is the control OUT transmission, the USB interface module 44 receives the data packet from the USB host, and the interface control module 41 stores the data packet received by the USB interface module 44 in the second data buffer space; if it is the control IN transmission, the USB interface The interface module 44 receives the data packet request from the USB host, and the interface control module 41 retrieves the data packet from the second data buffer space and sends the data packet to the USB host through the USB interface module 44 .

S606', status packet transmission;

The main control module 42 sends the status packet to the interface control module 41; the USB interface control module 41 returns the status packet to the USB host through the USB interface control module 41 after the USB interface module 44 receives the status packet request from the USB host.

So far, the second control transmission is completed.

It should be understood that FIG. 3 is an example of allocating two event buffer spaces in advance, so FIG. 3 only shows the process of two control transmissions. In practical applications, USB peripherals can allocate more event buffer space in advance, so after the second control transfer is completed, the process similar to the above S601~S606 or S601'~S606' can continue to be executed, which is different here. one shows.

It can be seen from the above that the USB peripheral device in the embodiment of the present application can allocate multiple event buffer spaces at one time to store the setup packets of multiple control transmissions, which can avoid the need for the USB peripheral device to allocate a buffer in advance for each control transmission. The technical defects of space reduce the interaction between software and hardware of USB peripherals, and improve the efficiency of USB control transmission. In addition, USB peripherals use the event cache space to store Setup packets and the data cache space to store Data packets. The event cache space and the data cache space are independent of each other and do not interfere with each other, so it can also improve the loss caused by the untimely allocation of the data cache space. The packet phenomenon further improves the reliability of USB control transmission.

It should be understood that the cache space used to store the setup package in the above-mentioned embodiment shown in FIG. 3 takes the event cache space as an example, and can also be replaced with a data cache space during specific implementation, that is, the setup package in the data cache space. Allocating multiple cache spaces can also reduce the interaction between software and hardware of USB peripherals and improve the efficiency of USB control transmission.

Referring to FIG. 4 , another method based on USB communication provided by an embodiment of the present application, taking the method applied to the USB peripheral in the above-mentioned FIG. 2A as an example, the method includes:

S700, the main control module 42 allocates one or more event buffer spaces, and notifies the interface control module 41 of the first address of the one or more event buffer spaces;

S701, the USB interface module 44 receives a setup packet from the USB host, and the setup packet is used to indicate the start of a control transmission; the interface control module 41 determines whether there is a free event buffer space in the event buffer space, and if there is, the USB in S701 The setup packet received by the interface module 44 is stored in the free event buffer space; otherwise, the setup packet received by the USB interface module 44 in S701 is used to replace the setup packet (ie the historical setup packet) in the non-idle event buffer space.

It should be noted that, due to the space limitation of the drawings, in order to clearly show the drawings, the USB interface module 44 is not shown in FIG. 4 , but there is a USB interface module between the actual interface control module 41 and the USB host. It is assumed that the USB interface module 44 finally sends data to an external device (such as a USB host) and receives data from the external device.

The following describes the methods for the USB interface module 44 to store the setup package in the two cases of allocating one event buffer space and multiple event buffer spaces to the main control module 42 .

Situation 1. The main control module 42 only allocates one event buffer space, then the interface control module 41 directly stores the received first setup packet in the event buffer space; starting from the received second setup packet, in the event buffer space Replace the previous setup packet with the newly received setup packet, so as to ensure that the newly received setup packet is not lost.

For example, after the first control transmission starts, the USB interface module 44 receives the first setup packet, and the interface control module 41 stores the first setup packet in the event buffer space; after the second control transmission starts, the USB interface module 44 receives the first setup packet. to the second setup package, but since the event buffer space has already stored the first setup package in the first control transfer, the interface control module 41 replaces the first setup package with the second setup package; after the third control transfer starts, The USB interface module 44 receives the third setup packet, but since the event buffer space has already stored the second setup packet in the second control transmission, the interface control module 41 replaces the second setup packet with the third setup packet...

In case 2, the main control module 42 allocates multiple event buffer spaces, and when the interface control module 41 stores the setup package, it starts from the first event buffer space of the multiple event buffer spaces, and sequentially stores the setup package.

Taking the main control module 42 allocating three event buffer spaces (ie, the first event buffer space, the second event buffer space, and the third event buffer space) as an example: after the first control transmission starts, the USB interface module 44 receives the first setup package, the interface control module 41 stores the first setup package in the first event buffer space; after the second control transmission starts, the USB interface module 44 receives the second setup package, and the interface control module 41 stores the second setup package in the The second event buffer space; after the third control transmission starts, the USB interface module 44 receives the third setup packet, and the interface control module 41 stores the third setup packet in the third event buffer space.

Further, when the last event buffer space of the multiple event buffer spaces is exhausted, the old setup package may be replaced with a new setup package to ensure that the new setup package does not lose packets.

For example, following the example of the above three event buffer spaces, when the fourth control transmission starts, the USB interface module 44 receives the fourth setup packet, and all the event buffer spaces (ie the first event buffer space, the second event buffer space, the second event buffer space The buffer space and the third event buffer space) have already stored the setup package, then the interface control module 41 can replace the old setup package with the new setup package (ie, the fourth setup package).

The present application does not limit the specific manner in which the interface control module 41 uses the new setup package to replace the old setup package. The following are examples of two possible ways:

Method 1, "use and replace".

After the USB interface module 44 receives a new setup packet, if the interface control module 41 finds that the event buffer space is exhausted, the interface control module 41 clears one event buffer space among the plurality of event buffer spaces, and stores the new setup packet and the corresponding number are stored in the emptied event buffer space. Optionally, the one event buffer space is stored before clearing: among the received (or stored) setup packages, the setup package with the earliest or latest time is received, or in the received (or stored) setup package. The smallest or largest number among the numbers corresponding to the setup package. It should be understood that if it is numbered in descending order, the setup package with the earliest reception time is the setup package with the smallest number. On the contrary, if it is numbered in descending order, the setup package with the earliest reception time is the one with the largest number. the setup package.

Taking the fourth setup package as an example, and taking the event cache space storing the setup package with the earliest reception time among the received setup packages as an example, the fourth setup package can be used to replace the first event cache space. The first setup package previously stored in .

Method 2, "one-time clearing".

After the USB interface module 44 receives a new setup packet, if the interface control module 41 finds that the event buffer space is exhausted, the interface control module 41 clears all the event buffer space at one time, then starts a new polling, and stores the storage in sequence. New setup package and corresponding number.

Taking the fourth setup package as an example, the interface control module 41 clears all event buffer spaces (ie, the first event buffer space, the second event buffer space, and the third event buffer space), and stores the fourth setup package in the first event buffer. After that, if there is a new setup package, it will be stored in the second event buffer space in sequence.

S702, the interface control module 41 reports an event to notify the main control module 42;

S703. After receiving the notification, the main control module 42 reads and parses the content of the last (or latest) setup package, such as the content of the first setup package, from the event buffer space, and obtains the size and content of the data package to be transmitted. and direction;

S704, the main control module 42 allocates the data buffer space according to the size of the data packet to be transmitted, and notifies the interface control module 41 of the first address of the data buffer space;

S705, data packet transmission;

S706, status packet transmission.

For the specific implementation process of S702 to S706, reference may be made to the above S602 to S606 or S602' to S606', which will not be repeated here.

It can be seen from the above that in the embodiment of the present application, the USB peripheral cache provides an overlay function. After the USB peripheral receives the setup package, if the USB peripheral has not allocated the event cache space for storing the setup package, the previously controlled The event buffer space allocated during the transmission process is emptied and then new setup packets are stored. In this way, even if there is no free buffer space, the USB peripheral can receive and save new setup packets at any time, thereby avoiding the occurrence of packet loss. In addition, USB peripherals use the event buffer space to store Setup packets and the data buffer space to store Data packets. The event buffer space and the data buffer space are independent of each other and do not interfere with each other, so it is also possible to lose packets caused by untimely allocation of data buffer space. phenomenon, and further improve the reliability of USB control transmission.

It should be understood that the cache space used to store the setup package in the embodiment shown in the above-mentioned FIG. 4 is an example of the event cache space. In specific implementation, it can also be replaced with a data cache space, that is, a data cache used to store the setup package. When the space is exhausted, the old setup package is replaced with a new setup package in the data cache space, and the USB peripheral device can also receive and save a new setup package at any time to avoid the effect of packet loss.

Referring to FIG. 5 , another method based on USB communication provided by an embodiment of the present application, taking the method applied to the USB peripheral in the above-mentioned FIG. 2A as an example, the method includes:

S801, the main control module 42 allocates at least one event buffer space;

As shown in FIG. 5 , each event buffer space includes a first subspace S431A for storing the setup package and a second subspace S431B for storing the number of the setup package. It should be understood that FIG. 5 only shows one event buffer space, and there may actually be more.

S802, the USB interface module 44 receives the first setup package from the USB host, and the first setup package is used to instruct the USB host and the USB peripheral to start a control transmission; the interface control module 41 generates a unique number for the first setup package, such as the first setup package. A number, and then associate the first number with the first setup package.

It should be noted that, due to the space limitation of the accompanying drawings, in order to clearly show the accompanying drawings, the USB interface module 44 is not shown in FIG. 5 , but there is a USB interface module between the actual interface control module 41 and the USB host. It is assumed that the USB interface module 44 finally sends data to an external device (such as a USB host) and receives data from the external device.

Specifically, the interface control module 41 associates the first number with the first setup packet, which may be the interface control module 41 stores the first number and the first setup packet in the same event buffer space. For example, the first setup package is stored in the first subspace of the first event buffer space, and the first number is stored in the second subspace of the first event buffer space.

In a possible design, the main control module 42 allocates only one event buffer space. In this case, the event buffer space can provide an overlay function, that is, the newly received setup package and its number can overwrite the historical setup package (that is, the previously received setup package) and its number. For specific implementation, reference may be made to the relevant introduction of the first case in S701, which will not be repeated here.

In another possible design, the main control module 42 allocates multiple event buffer spaces, then the interface control module 41 can store the multiple setup packets received in the multiple control transmissions in sequence according to the time sequence of receiving the setup packets. into the multiple event buffer spaces. In this case, when the event buffer space allocated in advance is used up, that is, when there is no free event buffer space, the event buffer space can also provide an overlay function, that is, the interface control module 41 can use the setup newly received by the USB interface module 44. The package and its number replace the historical setup package (ie, the setup package previously received by the USB interface module 44 ) and its number stored in the event buffer space. For specific implementation, reference may be made to the relevant introduction of the second situation in the above S701, and details are not repeated here.

S803, the interface control module 41 reports the event to notify the main control module 42, and triggers the main control module 42 to read the serial number and the setup package;

S804. After receiving the notification, the main control module 42 reads the last (or the latest) setup package and its number from the event buffer space, parses the read setup package, and obtains the size, content and number of the data package to be transmitted. direction, the first setup package and the first number are read as an example in Figure 5;

S805. The main control module 42 allocates a data buffer space of a specified size according to the size of the first data packet, and the data buffer space is used to store the first data packet to be transmitted; compare the first data packet to be transmitted with the first serial number Associated;

The main control module 42 may associate the first data packet to be transmitted with the first number in various manners, which are not limited in this application. Here are several possible ways: way 1, the main control module 42 stores the first number in the data buffer space allocated for the first data packet. For example, as shown in FIG. 5, the data buffer space includes a data buffer for storing data A third subspace S432A of the package and a fourth subspace S432B for storing numbers, and the main control module stores the first number in the fourth subspace S432B. Mode 2: The main control module 42 directly issues the first number to the interface control module 41 to indicate that the currently allocated data buffer space is allocated for the first data packet. Mode 3: The main control module 42 stores the first number in the other data buffer space, and then associates the other data buffer space with the data buffer space for storing the first data packet to be transmitted.

It should be understood that, if it is a control IN transmission, the main control module 42 also needs to prepare a data packet to be sent to the USB host, and store it in the third subspace S432A of the data buffer space.

It should also be noted that, after the USB interface module 44 receives the first setup packet, and before the start of the data phase of the control transmission initiated by the first setup packet (that is, after step S802 and before step S806), the USB interface Module 44 may receive new setup packets. During this period, whether the USB interface module 44 will receive a new setup packet depends on whether the USB host sends a new setup packet. If the USB interface module 44 receives a new setup packet again, the interface control module 41 also executes the above-mentioned process of S802 for the new setup packet. For example, after step S802 and before step S806, the USB interface module 44 receives the second setup packet from the USB host, and the second setup packet is used to instruct the USB host and the USB peripheral to start another control transmission; the interface control module 41 is The second setup package generates a unique number, such as the second number, and the second number and the second setup package are associated and stored in the event buffer space allocated in S801; wherein the first number is different from the second number.

S806, data packet transmission;

When the data phase of the control transmission initiated by the first setup packet starts, the interface control module 41 determines that the number of the setup packet newly received by the USB interface module 44 is consistent with the number of the data packet to be transmitted, and then transmits the data to the USB host. packet; if inconsistent, the data packet is not transmitted.

If the data stage of the control transmission is OUT transmission, the data transmission process may include: the USB interface module 44 receives the data packet from the USB host; The interface control module 41 stores the data packet received by the USB interface module 44 in the data buffer space, otherwise the data packet is discarded.

If the data phase of the control transmission is IN transmission, the data transmission process may include: the USB interface module 44 receives a data packet request from the USB host; if the interface control module 41 determines the latest stored number in the event buffer space and the data buffer space If the numbers are the same, the interface control module 41 reads the data packet from the data buffer space and controls the USB interface module 44 to send the data packet to the USB host; otherwise, the data packet is not returned.

A specific example: After the USB host sends a setup packet-1 to the USB peripheral, it immediately sends a setup packet-2 to the USB peripheral. Based on the above method, the latest number in the event buffer space is the setup packet-2. The number (assuming it is the second number); at this time, if the main control module 42 prepares the transmission of the data packet-1 (that is, the number in the data buffer space is the number of the setup packet-1, such as the first number, the data buffer The data packet in the space is data packet-1), then after the USB host sends a request for data packet-2, the interface control module 41 will determine the number in the data buffer space (ie the first number) and the number in the event buffer space. The latest number (ie, the second number) is inconsistent, so the USB interface module 44 will not be controlled to send the data packet-1 to the USB host, so that the wrong packet transmission of the data packet can be avoided.

S807, status packet transmission.

Specifically, the main control module 42 is sending a status packet to the interface control module 41, and the interface control module 41 controls the USB interface module 44 to send the status packet to the USB host.

Optionally, a number verification process can also be added to the status packet transmission process. For example, before the main control module 42 sends the status packet to the interface control module 41, the main control module 42 can use the first number read in S804 as the first number. The number of the status packet, and then the number and the status packet are sent to the interface control module 41; correspondingly, after the USB interface module 44 receives the status packet request from the USB host, the interface control module 41 can check the Whether the number of the status packet is consistent with the number of the setup packet newly received by the USB interface module 44, if they are consistent, the interface control module 41 controls the USB interface module 44 to send the status packet to the USB host, otherwise the interface control module 41 does not control the USB interface module 44 Send the status packet, so as to avoid the wrong packet transmission of the status packet.

So far, this control transmission is completed.

After the USB peripheral receives a new Setup package at any time, it only needs to repeat the above steps S802-S806.

It can be seen from the above that the USB peripheral device in the embodiment of the present application generates a unique number for each setup packet, and when preparing the transmission of the data/status packet, the data/status packet is attached with the setup packet corresponding to the current pen control transmission Only after the number corresponding to the data/status packet is consistent with the number of the latest received setup packet, the USB peripheral will start to transmit the data/status packet, so as to avoid the transmission of wrong packets. In addition, the event buffer space and the data buffer space are independent of each other and do not interfere with each other, so it can also improve the packet loss caused by the untimely allocation of data buffer space, and further improve the reliability of USB control transmission. Reliability; not only that, the USB peripheral cache can also provide an overlay function, which can ensure that the USB peripheral receives and saves a new setup packet at any time, thereby avoiding the occurrence of packet loss; in addition, the USB peripheral can also be allocated at one time. Multiple event buffer spaces can reduce the interaction between software and hardware of USB peripherals, thereby improving the efficiency of USB control transmission.

It should be understood that the cache space used to store the setup package in the embodiment shown in FIG. 5 is the event cache space as an example, and in specific implementation, it can also be replaced with a data cache space, that is, the setup is stored in the data cache space at the same time. Packets and data/status packets, and check the numbers of setup packets and data/status packets before transmitting data/status packets, which can also avoid the occurrence of wrong packet transmission, thereby improving the reliability of USB control transmission.

The above embodiments can be combined with each other to achieve different technical effects.

Referring to FIG. 6 , another method based on USB communication provided by an embodiment of the present application, taking the method applied to the USB peripheral in the above-mentioned FIG. 2A as an example, the method includes:

S901, the USB peripheral device respectively receives setup packets from the USB host at different times, wherein any setup packet is used to initiate a corresponding control transmission;

S902, the USB peripheral generates a unique number for each setup package that has been received, and associates each setup package with its corresponding number; and, associates the number corresponding to each setup package with all The data packets to be transmitted in the control transmission initiated by each setup packet are associated;

S903. After the data transmission phase of any control transmission starts, the USB peripheral determines the number corresponding to the data packet to be transmitted in the arbitrary control transmission and the number corresponding to the setup packet newly received by the USB peripheral After the agreement is reached, the data packet to be transmitted in the arbitrary control transmission is transmitted with the USB host.

For the specific implementation method of each step in the foregoing S901 to S903, reference may be made to the relevant embodiments above, which will not be repeated here.

Based on the same technical concept, the embodiments of the present application further provide a computer-readable storage medium, which stores computer program instructions, and when the instructions are executed, the above-mentioned methods in FIG. 3 to FIG. 6 are implemented.

Based on the same technical concept, an embodiment of the present application also provides a chip, which can be coupled with a memory, and is used for reading and executing program instructions stored in the memory, implementing the methods in FIGS. 3 to 6 above.

Based on the same technical concept, an embodiment of the present application further provides a computer program product, where instructions are stored in the computer program product, and when the computer program product runs on a computer, the computer executes the methods in FIGS. 3 to 6 .

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A communication method based on a universal serial bus (USB), characterized in that the method is applied to a USB peripheral device, and the USB peripheral device and a USB host are communicatively connected through a USB bus;

The method includes:

Receive establishment packets from the USB host at different times, wherein any establishment packet is used to initiate a corresponding control transmission;

Generate a unique number for each of the received set-up packages, and associate each of the set-up packages with its corresponding number; The data packets to be transmitted in the initiated control transmission are associated;

After the start of the data transmission phase of any control transmission, after it is determined that the number corresponding to the data packet to be transmitted in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral, The USB host transmits the data packets to be transmitted in the arbitrary control transmission.
The method according to claim 1, wherein before associating each establishment packet with its corresponding serial number, the method further comprises:

Allocate at least one event buffer space;

Associate each establishment package with its corresponding number, including:

Each of the establishment packets and their corresponding numbers are stored in the same event buffer space.
The method of claim 2, wherein there are multiple allocated event buffer spaces;

Store each of the establishment packets and their corresponding numbers in the same event buffer space, including:

According to the time sequence of receiving the establishment packets, the multiple establishment packets received at different times and the corresponding numbers are sequentially stored in the allocated multiple event buffer spaces.
The method according to claim 2, characterized in that, storing each establishment packet and its corresponding serial number in the same event buffer space, comprising:

If there is a free event buffer space in the at least one event buffer space, then store the number corresponding to each establishment packet in the free event buffer space;

If there is no free event buffer space in the at least one event buffer space, the N set-up packets received at different times and their corresponding numbers are used to respectively replace the historical numbers stored in the at least one event buffer space from old to old. The establishment packets and corresponding numbers in the new N event buffer spaces, where N is a positive integer.
The method according to claim 2, wherein if there is no free event buffer space in the at least one event buffer space, storing each establishment packet and its corresponding number in the same event buffer space ,include:

Empty all event cache spaces in the at least one event cache space; according to the chronological order of receiving the establishment packets, store N establishment packets and corresponding numbers received at different times in the cleared N event cache spaces in turn in; or,

After receiving the i-th establishment packet in the N establishment packets, clear one event buffer space in the at least one event buffer space; store the i-th establishment packet and the corresponding number in the cleared In an event buffer space, the i is a positive integer from 1 to N;

Among them, N is a positive integer.
The method according to claim 5, characterized in that, before being cleared, the one event buffer space stores: the establishment packet with the earliest reception time among the received establishment packets, or the establishment packet corresponding to the received establishment packet The smallest number or the largest number among the numbers.
The method according to any one of claims 1-6, characterized in that after associating each establishment packet with its corresponding number, and after associating the corresponding number of each establishment packet with each Before establishing the association of the data packets to be transmitted in the packet-initiated control transmission, the method further includes:

Parse the content of each establishment packet, and obtain the size of the data packet to be transmitted in the control transmission initiated by each establishment packet;

Allocate data buffer space for data packets to be transmitted in the control transmission initiated by each setup packet according to the size;

Associate the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet, including:

For any establishment packet, the number corresponding to the establishment packet and the data packet to be transmitted in the control transmission initiated by the establishment packet are stored in the control transmission initiated for the establishment packet. In the data buffer space allocated by the packet.
The method according to claim 7, wherein, the data stage of any control transmission is that the USB host sends a data packet to the USB peripheral;

After the start of the data phase of any control transmission, after it is determined that the number corresponding to the data packet to be transmitted in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral The USB host transmits the data packets to be transmitted in any of the control transmissions, including:

receiving data packets from the USB host;

After determining that the number corresponding to the data packet to be transmitted in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral device, the received data packet is stored as the arbitrary one. The data buffer space allocated by the data packets to be transmitted in the pen control transmission.
The method according to claim 7, wherein the data phase of the arbitrary control transmission is that the USB peripheral device sends a data packet to the USB host;

After parsing the content of each establishment package, it also includes:

Obtain the content of the data packet to be transmitted in the control transmission initiated by each establishment packet;

After allocating data buffer space for the data packets to be transmitted in the control transmission initiated by each setup packet according to the size, and before the start of the data phase of any control transmission, the method further includes:

According to the content, the data packets to be transmitted in the control transmission initiated by each establishment packet are stored in the data buffer space allocated for the data packets to be transmitted in the control transmission initiated by each establishment packet;

After the start of the data phase of any control transmission, after it is determined that the number corresponding to the data packet to be transmitted in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral The USB host transmits the data packets to be transmitted in any of the control transmissions, including:

receiving a data packet request from the USB host, where the data packet request is used to request the USB peripheral to send a data packet;

After determining that the number corresponding to the data packet to be transmitted in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral device, according to the data packet request from the control transmission for the arbitrary control transmission The data packet is read from the data buffer space allocated by the data packet to be transmitted and sent to the USB host.
The method according to any one of claims 1-9, characterized in that after associating the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet, The method also includes:

Associate the number corresponding to each establishment packet with the status packet in the control transmission initiated by each establishment packet;

After the data phase of the arbitrary control transmission ends, the method further includes:

Receive a status packet request from the USB host, where the status packet request is used to request the USB peripheral to send a status packet; determine that the number corresponding to the status packet in any of the control transmissions is up-to-date with the USB peripheral After the numbers corresponding to the received setup packets are consistent, the status packet to be transmitted in the arbitrary control transmission is sent to the USB host.
A USB-based communication device, characterized in that the device is applied to a USB peripheral device, and the USB peripheral device and a USB host are communicatively connected through a USB bus;

The USB interface module is used to respectively receive establishment packets from the USB host at different times, wherein any establishment packet is used to initiate a corresponding control transmission;

an interface control module, for generating a unique number for each of the received setup packets, and associating each of the setup packets with its corresponding number;

a main control module, for associating the corresponding number of each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet;

The interface control module is further configured to, after the start of the data transmission phase of any control transmission, determine the number corresponding to the data packet to be transmitted in the arbitrary control transmission and the newly received establishment of the USB peripheral. After the numbers corresponding to the packets are consistent, the USB interface module and the USB host are controlled to transmit the data packets to be transmitted in the arbitrary control transmission.
The device according to claim 11, wherein the main control module is further used for:

Allocate at least one event buffer space before the interface control module associates each establishment packet with its corresponding serial number;

When the interface control module associates each establishment packet with its corresponding serial number, it is specifically used for:

Each of the establishment packets and their corresponding numbers are stored in the same event buffer space.
The apparatus of claim 12, wherein there are multiple allocated event buffer spaces;

When the interface control module stores each establishment packet and its corresponding serial number in the same event buffer space, it is specifically used for:

According to the time sequence of receiving the establishment packets, the multiple establishment packets received at different times and the corresponding numbers are sequentially stored in the allocated multiple event buffer spaces.
The device according to claim 12, wherein, when the interface control module stores each establishment packet and its corresponding serial number in the same event buffer space, it is specifically used for:

If there is a free event buffer space in the at least one event buffer space, then store the number corresponding to each establishment packet in the free event buffer space;

If there is no free event buffer space in the at least one event buffer space, the N set-up packets received at different times and their corresponding numbers are used to respectively replace the historical numbers stored in the at least one event buffer space from old to old. The establishment packets and corresponding numbers in the new N event buffer spaces, where N is a positive integer.
The apparatus according to claim 13, wherein if there is no free event buffer space in the at least one event buffer space, the interface control module stores the corresponding number of each establishment packet in the When in the same event buffer space, it is specifically used for:

Empty all event cache spaces in the at least one event cache space; according to the chronological order of receiving the establishment packets, store N establishment packets and corresponding numbers received at different times in the cleared N event cache spaces in turn in; or,

After the USB interface module receives the i-th establishment packet in the N establishment packets, clear one event buffer space in the at least one event buffer space; store the i-th establishment packet and the corresponding number in the In the one event buffer space after being emptied, the i is a positive integer from 1 to N;

Among them, N is a positive integer.
The device according to claim 15, wherein before being cleared, the one event buffer space stores: the establishment packet with the earliest reception time among the establishment packets received by the USB interface module, or the establishment packet with the earliest reception time in the USB interface module. The smallest number or the largest number among the numbers corresponding to the setup packets received by the interface module.
The device according to any one of claims 11-16, wherein the main control module is further configured to:

After the interface control module associates each setup packet with its corresponding number, and in the control transmission initiated by the main control module between the number corresponding to each setup packet and each setup packet Before the data packets to be transmitted are associated, the content of each establishment packet is parsed, and the size of the data packet to be transmitted in the control transmission initiated by each establishment packet is obtained; Allocate data buffer space for data packets to be transmitted in the initiated control transmission;

When the main control module associates the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by each establishment packet, it is specifically used for:

For any establishment packet, the number corresponding to the establishment packet and the data packet to be transmitted in the control transmission initiated by the establishment packet are stored in the control transmission initiated for the establishment packet. In the data buffer space allocated by the packet.
The device according to claim 17, wherein, the data phase of the arbitrary control transmission is that the USB host sends a data packet to the USB peripheral;

The USB interface module is further configured to: receive a data packet from the USB host after the start of the data phase of any control transmission;

When controlling the USB interface module and the USB host to transmit the data packets to be transmitted in the arbitrary control transmission, the interface control module is specifically configured to: determine the data to be transmitted in the arbitrary control transmission After the number corresponding to the packet is consistent with the number corresponding to the establishment packet newly received by the USB peripheral, the received data packet is stored in the data packet allocated for the data packet to be transmitted in the arbitrary control transmission. Data cache space.
The device of claim 17, wherein the data phase of the arbitrary control transmission is that the USB peripheral device sends a data packet to the USB host;

The main control module is further configured to: after parsing the content of each establishment packet, obtain the content of the data packet to be transmitted in the control transmission initiated by each establishment packet; After allocating data buffer space for the data packets to be transmitted in the control transmission initiated by each setup packet, and before the start of the data phase of any one control transmission, the control transmission initiated by each setup packet is stored in the control transmission initiated by each setup packet according to the content. The data packets to be transmitted are stored in the data buffer space allocated for the data packets to be transmitted in the control transmission initiated by each setup packet;

The USB interface module is further configured to receive a data packet request from the USB host after the start of the data phase of any control transmission, where the data packet request is used to request the USB peripheral to send a data packet ;

When the interface control module controls the USB interface module and the USB host to transmit the data packets to be transmitted in the arbitrary control transmission, it is specifically configured to: determine the data packets to be transmitted in the arbitrary control transmission After the corresponding number is consistent with the number corresponding to the establishment packet newly received by the USB peripheral device, according to the data packet request, from the data buffer space allocated for the data packet to be transmitted in the arbitrary control transmission. The data packet is read, and the read data packet is sent to the USB host through the USB interface module.
The device according to any one of claims 11-19, wherein the main control module is further configured to:

After associating the number corresponding to each setup packet with the data packet to be transmitted in the control transmission initiated by each setup packet, the number corresponding to each setup packet is initiated with the is associated with the status packet in the control transfer;

The USB interface module is further configured to receive a status packet request from the USB host after the data phase of any control transmission ends, where the status packet request is used to request the USB peripheral to send a status packet ;

The interface control module is further configured to: after determining that the number corresponding to the status packet in the arbitrary control transmission is consistent with the number corresponding to the establishment packet newly received by the USB peripheral device, control the USB interface module to send the information to the relevant device. The USB host sends the status packet to be transmitted in the arbitrary control transmission.
The device according to claim 12, wherein the interface control module is further configured to: after storing each establishment packet and its corresponding serial number in the same event buffer space, send a message to the main control module reporting an interrupt signal, the interrupt signal is used to instruct the main control module to read the corresponding number of each establishment packet from the event buffer space;

The main control module is further configured to: receive the interface control module from the interface control module before associating the number corresponding to each establishment packet with the data packet to be transmitted in the control transmission initiated by the each establishment packet. interrupt signal; read the corresponding number of each establishment packet from the event buffer space based on the interrupt signal.
A computer-readable storage medium comprising computer program instructions which, when executed, cause the method of any one of claims 1-10 to be implemented.
A chip, characterized in that the chip is coupled with a memory, and is used for reading and executing program instructions stored in the memory, so as to implement the method according to any one of claims 1-10.
A computer program product, characterized in that the computer program product stores instructions that, when executed on a computer, cause the computer to execute the method according to any one of claims 1-10.