CN112748943A - Upgrading method and upgrading system for non-intelligent interactive electronic whiteboard - Google Patents
Upgrading method and upgrading system for non-intelligent interactive electronic whiteboard Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/955—Retrieval from the web using information identifiers, e.g. uniform resource locators [URL]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/146—Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
Abstract
The invention discloses an upgrading method and an upgrading system of a non-intelligent interactive electronic whiteboard, which comprise the following steps: a display interface of the non-intelligent interactive electronic whiteboard receives an upgrade request message of a user and sends the upgrade request message to the single chip microcomputer; after receiving the upgrading request message, the single chip microcomputer sends the upgrading request message to the OTA server through a network; after receiving the upgrading request message, the OTA server sends a new version packet to the single chip microcomputer; the single chip microcomputer receives the new version packet and then sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard; and after receiving the new version package, the display control module starts upgrading. The invention obtains the new version package from the OTA server through the network interface formed by the singlechip with the RMII interface and the network switch chip, and then sends the new version package to the display control module through the USB interface, thereby realizing the remote upgrade of the display control module.
Description
Technical Field
The invention relates to the technical field of electronic whiteboards, in particular to an upgrading method and an upgrading system of a non-intelligent interactive electronic whiteboard.
Background
At present, a plurality of intelligent interactive electronic whiteboards are available on the market, the intelligent interactive electronic whiteboards are widely applied to application places such as commercial media, cultural performance markets, stadiums, information dissemination, news distribution, stock exchange and the like, and most of the intelligent interactive electronic whiteboards are used for ANDROID systems, so that later-stage updating of software can be realized through network upgrading (OTA). However, in some application fields, in consideration of security or cost, the design of the interactive electronic whiteboard is also implemented by using a conventional television chip without an intelligent system, and the non-intelligent interactive electronic whiteboard can also implement the interactive operation of a computer by using the original television chip, a touch frame and an industrial computer (OPS computer), but because no operating system such as ANDROID is used, the security is improved greatly. The method for upgrading software by using a chip adopted by the non-intelligent interactive electronic whiteboard generally reads files through a USB flash disk. The direct use of the USB flash disk for reading the file for upgrading firstly requires an operator to manually read the software version of the non-intelligent interactive electronic whiteboard main control chip, then copies the appropriate upgrade file by using the USB flash disk, inserts the USB flash disk into the non-intelligent interactive electronic whiteboard, and carries out manual installation. Therefore, on one hand, the USB flash disk needs to be repeatedly plugged and unplugged; on the other hand, the manual operation needs to be carried out by consuming more time of operators, so that the working intensity is increased; most importantly, after-market machines are distributed throughout the world, and manual labor to maintain and upgrade are very costly.
Disclosure of Invention
The invention mainly aims to provide an upgrading method and an upgrading system for a non-intelligent interactive electronic whiteboard, which can solve the problems and can realize the remote upgrading of a display control module of the non-intelligent interactive electronic whiteboard.
The invention adopts the following technical scheme:
on one hand, the upgrading method of the non-intelligent interactive electronic whiteboard comprises the following steps:
a display interface of the non-intelligent interactive electronic whiteboard receives an upgrading request message of a user and sends the upgrading request message to the single chip microcomputer through a first communication port; the upgrading request message comprises URL information of the OTA server;
after receiving the upgrading request message, the single chip microcomputer sends the upgrading request message to the OTA server through a network based on the URL information;
after receiving the upgrading request message, the OTA server sends a new version packet to the single chip microcomputer;
after receiving the new version packet, the single chip microcomputer sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port;
and after receiving the new version package, the display control module starts upgrading.
Preferably, before the display interface of the non-intelligent interactive electronic whiteboard receives the upgrade request message of the user, the method further includes:
a display interface of the non-intelligent interactive electronic whiteboard receives a query request message of a user and sends the query request message to the single chip microcomputer through a first communication port; the query request message comprises URL information of the OTA server and current version information of the display control module;
after receiving the upgrading request message, the single chip microcomputer sends query request information to the OTA server through a network based on the URL information;
after receiving the query request message, the OTA server sends version information of a new version packet to the single chip microcomputer;
and the single chip microcomputer receives the version information of the new version packet, compares the version information with the current version information of the display control module, and sends a comparison result to the display interface of the non-intelligent interactive electronic whiteboard.
Preferably, before the display interface of the non-intelligent interactive electronic whiteboard receives the upgrade request message of the user, the method further includes:
and judging whether a new version package exists or not based on the comparison result, and if so, sending an upgrading request message.
Preferably, the upgrade request message sent by the single chip to the OTA server further includes: the storage space or the size of the split packet of the single chip microcomputer.
Preferably, after receiving the upgrade request message, the OTA server sends a new version packet to the single chip, which specifically includes:
after receiving the upgrade request message, the OTA server splits the new version packet into a plurality of split packets marked with serial numbers and check information according to the storage space of the single chip microcomputer or the size of the split packets, and sequentially sends the split packets to the single chip microcomputer according to the serial numbers; the size of each split packet is smaller than the storage space of the single chip microcomputer or equal to the size of the split packet.
Preferably, after receiving the new version packet, the single chip microcomputer sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer checks each received split packet and sends the check result to a display control module of the non-intelligent interactive electronic whiteboard through the second communication port after the check is successful; after the display control module receives one split packet, starting upgrading; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
Preferably, after receiving the new version packet, the single chip microcomputer sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer sends the split packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port when receiving the split packet; after the display control module receives one split packet, checking is carried out, and upgrading is started after successful checking; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
Preferably, the first communication interface includes a UART interface; the second communication port includes a USB interface.
In another aspect, a system for upgrading a non-intelligent interactive whiteboard includes:
the OTA server is used for storing a new version package, OTA service software and upgrade file information which can be downloaded by the server;
the non-intelligent interactive electronic whiteboard comprises a singlechip, a network switch chip and a display control module; the single chip microcomputer comprises an RMII interface; the RMII interface is connected with a network switch chip so that the singlechip has a network connection function; the display control module does not comprise an OS operating system and does not have a network connection function; the single chip microcomputer is connected with the OTA server through a network to obtain a new version package; the single chip microcomputer is connected with the display control module through a USB port to send a new version package obtained from the OTA server, and the display control module starts upgrading after receiving the new version package.
Compared with the prior art, the invention has the following beneficial effects:
the invention obtains a new version package from an OTA server through an internet access formed by a singlechip with an RMII interface and a switch, and then sends the new version package to the display control module through a serial port, thereby realizing the remote upgrade of the display control module and achieving the same network upgrade function as an intelligent interactive electronic whiteboard;
the singlechip of the invention is used as a network device on one hand and a USB storage device on the other hand; because the storage space or the size of the splitting package of the singlechip is small, if the new version package is small, the transmission upgrade can be carried out at one time, if the new version package is large, the new version package needs to be split at the OTA server and then is sequentially sent to the singlechip, the singlechip is sequentially sent to the display control module, and the display control module carries out the sub-package upgrade;
according to the invention, the upgrading can be automatically realized only by issuing an upgrading instruction on the display interface of the non-intelligent interactive electronic whiteboard, and the OTA server can be started to actively access to the upgrading information; the workload of operators can be reduced, and the display control module of the electronic whiteboard can be rapidly realized when needing to be upgraded.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description of the technical means more comprehensible.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a simplified process flow diagram of an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an embodiment of the present invention;
fig. 3 is a block diagram of a system configuration according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, a method for upgrading a non-intelligent interactive electronic whiteboard includes:
s101, a display interface of a non-intelligent interactive electronic whiteboard receives an upgrading request message of a user and sends the upgrading request message to a single chip microcomputer through a first communication port; the upgrading request message comprises URL information of the OTA server;
s102, after receiving the upgrading request message, the single chip sends the upgrading request message to the OTA server through the network based on the URL information;
s103, after receiving the upgrading request message, the OTA server sends a new version packet to the single chip microcomputer;
s104, after receiving the new version packet, the single chip microcomputer sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port;
and S105, after receiving the new version package, the display control module starts upgrading.
Specifically, the single chip microcomputer is a single chip microcomputer with RMII, and the non-intelligent interactive electronic whiteboard further comprises a network switch chip. The RMII interface and the network switch chip form a device capable of surfing the Internet, so that the single chip microcomputer has a network connection function and is communicated with a remote OTA server. The display control module comprises a non-intelligent interactive main control chip and a peripheral circuit, the display control module is used for realizing the display function of the electronic whiteboard, and the non-intelligent interactive main control chip does not comprise a network interface or an operating system such as an ANDROID system, and is similar to a traditional television chip without an intelligent system.
It should be noted that the URL information of the OTA server can be edited and modified. Therefore, when the remote OTA server changes, the URL information can be directly modified to carry out connection, and a new version package is further acquired.
In a general upgrading process, whether the OTA server has a new version package or not needs to be judged first, then upgrading is carried out, if the OTA server does not have the new version package, upgrading is not carried out, and errors caused by the fact that the version which is the same as the current version or lower version is carried out in upgrading are prevented.
Therefore, in this embodiment, before the receiving, by the display interface of the non-intelligent interactive electronic whiteboard, the upgrade request message of the user, the method further includes:
a display interface of the non-intelligent interactive electronic whiteboard receives a query request message of a user and sends the query request message to the single chip microcomputer through a first communication port; the query request message comprises URL information of the OTA server and current version information of the display control module;
after receiving the upgrading request message, the single chip microcomputer sends query request information to the OTA server through a network based on the URL information;
after receiving the query request message, the OTA server sends version information of a new version packet to the single chip microcomputer;
and the single chip microcomputer receives the version information of the new version packet, compares the version information with the current version information of the display control module, and sends a comparison result to the display interface of the non-intelligent interactive electronic whiteboard.
And further, the system is used for judging whether a new version packet exists or not based on the comparison result, and if so, sending an upgrading request message after the user confirms upgrading. And only after the user confirms the upgrade, sending the upgrade request message, and if the user does not confirm the upgrade, not sending the upgrade request message.
It should be noted that, the user may also send only one upgrade request instruction, after receiving the upgrade request instruction, the OTA server automatically executes version query, feeds back a query result to the single chip, and executes new version packet acquisition and upgrade processing only when the version of the new version packet on the OTA server is higher than the version of the display control module, otherwise, prompts failure. Of course, the user may also send the version query command first, and then execute the upgrade request command after querying the new version. The specific manner in which this embodiment is implemented is not limited.
In this embodiment, the upgrade request message sent by the single chip to the OTA server further includes: and the storage space or the size of the split packet of the singlechip is used for splitting the version packet for the OTA server. Of course, the single chip microcomputer can also send the corresponding model to the OTA server. And the OTA server inquires the storage space corresponding to the single chip microcomputer according to a prestored table.
Further, after receiving the upgrade request message, the OTA server sends a new version packet to the single chip, which specifically includes:
after receiving the upgrade request message, the OTA server splits the new version packet into a plurality of split packets marked with serial numbers and check information according to the storage space of the single chip microcomputer or the size of the split packets, and sequentially sends the split packets to the single chip microcomputer according to the serial numbers; the size of each split packet is smaller than the storage space of the single chip microcomputer or equal to the size of the split packet.
In one embodiment, the verification of the split packet is executed by a single chip microcomputer, and in the scene, after the single chip microcomputer receives a new version packet, the new version packet is sent to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer checks each received split packet and sends the check result to a display control module of the non-intelligent interactive electronic whiteboard through the second communication port after the check is successful; if the check fails, the OTA server is enabled to resend the failure packet; after the display control module receives one split packet, starting upgrading; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
In another embodiment, the verification of the split packet is executed by the display control module, and in such a scene, after the single chip receives the new version packet, the new version packet is sent to the display control module of the non-intelligent interactive electronic whiteboard through the second communication port; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer sends the split packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port when receiving the split packet; after the display control module receives one split packet, checking is carried out, and upgrading is started after successful checking; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
No matter what method is adopted for checking, upgrading is started only when the received split packet is guaranteed to be free of problems; if the check fails, the OTA is allowed to retransmit the packet. In this embodiment, the split packets are sent in sequence and checked, so that the upgrade can be guaranteed to be stable and reliable.
Further, the first communication port comprises a UART interface; the second communication port includes a USB interface. In this embodiment, the second communication port is preferably a USB interface, which enables the upgrade speed to be faster.
Referring to fig. 3, an upgrading system for a non-intelligent interactive electronic whiteboard includes:
the OTA server 1 is used for storing a new version package, OTA service software and upgrade file information which can be downloaded by the server; the upgrade file information available for downloading comprises version information and the like.
The non-intelligent interactive electronic whiteboard 2 comprises a singlechip 21 and a display control module 22; the single chip microcomputer comprises an RMII interface; the display control module does not comprise an operating system and does not have a network connection function; the single chip microcomputer is connected with the OTA server through a network to obtain a new version package; the single chip microcomputer is connected with the display control module through a serial port to send a new version package obtained from the OTA server, and the display control module starts upgrading after receiving the new version package.
The upgrading system of the non-intelligent interactive electronic whiteboard further comprises: a network switch; the single chip is connected with the OTA server through the network switch chip 23.
Referring to fig. 3, the electronic whiteboard of the present embodiment further includes an embedded OPS and/or an external computer system, and when the embedded OPS and the external computer system are included at the same time, the electronic whiteboard is time-shared and controlled by the USB switch. The embedded OPS and the external computer system can communicate with the display control module. The electronic whiteboard of this embodiment further includes a touch frame (touch display screen TCON motherboard), where the touch frame is connected to the single chip, the display control module (including a non-operating system and a display control circuit board), the embedded OPS, and an external computer respectively.
An upgrading method for a non-intelligent interactive whiteboard is specifically implemented by an upgrading system for the non-intelligent interactive whiteboard, and repeated description is not given in this embodiment.
In this embodiment, an OTA upgrade interface is made on a UI menu of the display interface, and URL information for configuring the OTA server is provided thereon for a user to perform operations such as editing. When a user clicks for inquiry, the URL information and the current version information of the display control module are sent to the single chip microcomputer through the UART, and the single chip microcomputer inquires whether new software information exists in a server by using the website and the version information; if not, replying to no new software; if the new software exists, the upgrade is replied, the user clicks the upgrade key, and the display control module is restarted to enter the upgrade state.
Further, the single chip sends an upgrading instruction to request the OTA server to send a new version package; the OTA server divides the software into a plurality of split packets according to the specified size, and sends the split packets to the single chip microcomputer according to the serial number; the split packet includes the current packet sequence number, the number of all packets, the CRC validation information of the data packet, and the like. For example, 512 bytes is a packet, and the software size is 512K, then 1024 packets. After the single chip receives the data and successfully verifies the data, the sub-packages are upgraded to the display control module through the USB interface in sequence until all the data packages are sent, and the upgrading is successful.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (9)
1. A method for upgrading a non-intelligent interactive electronic whiteboard is characterized by comprising the following steps:
a display interface of the non-intelligent interactive electronic whiteboard receives an upgrading request message of a user and sends the upgrading request message to the single chip microcomputer through a first communication port; the upgrading request message comprises URL information of the OTA server;
after receiving the upgrading request message, the single chip microcomputer sends the upgrading request message to the OTA server through a network based on the URL information;
after receiving the upgrading request message, the OTA server sends a new version packet to the single chip microcomputer;
after receiving the new version packet, the single chip microcomputer sends the new version packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port;
and after receiving the new version package, the display control module starts upgrading.
2. The method for upgrading a non-intelligent interactive electronic whiteboard according to claim 1, wherein before the display interface of the non-intelligent interactive electronic whiteboard receives the upgrade request message from the user, the method further comprises:
a display interface of the non-intelligent interactive electronic whiteboard receives a query request message of a user and sends the query request message to the single chip microcomputer through a first communication port; the query request message comprises URL information of the OTA server and current version information of the display control module;
after receiving the upgrading request message, the single chip microcomputer sends query request information to the OTA server through a network based on the URL information;
after receiving the query request message, the OTA server sends version information of a new version packet to the single chip microcomputer;
and the single chip microcomputer receives the version information of the new version packet, compares the version information with the current version information of the display control module, and sends a comparison result to the display interface of the non-intelligent interactive electronic whiteboard.
3. The method for upgrading a non-intelligent interactive electronic whiteboard of claim 2, wherein before the display interface of the non-intelligent interactive electronic whiteboard receives the upgrade request message from the user, the method further comprises:
and judging whether a new version package exists or not based on the comparison result, and if so, sending an upgrading request message.
4. The upgrading method for the non-intelligent interactive electronic whiteboard of claim 1, wherein the upgrading request message sent by the single chip to the OTA server further comprises: the storage space or the size of the split packet of the single chip microcomputer.
5. The upgrading method for the non-intelligent interactive electronic whiteboard of claim 4, wherein the OTA server sends a new version packet to the single chip microcomputer after receiving the upgrading request message, specifically comprising:
after receiving the upgrade request message, the OTA server splits the new version packet into a plurality of split packets marked with serial numbers and check information according to the storage space of the single chip microcomputer or the size of the split packets, and sequentially sends the split packets to the single chip microcomputer according to the serial numbers; the size of each split packet is smaller than the storage space of the single chip microcomputer or equal to the size of the split packet.
6. The upgrading method of the non-intelligent interactive electronic whiteboard of claim 5, wherein the single chip microcomputer sends the new version package to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port after receiving the new version package; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer checks each received split packet and sends the check result to a display control module of the non-intelligent interactive electronic whiteboard through the second communication port after the check is successful; after the display control module receives one split packet, starting upgrading; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
7. The upgrading method of the non-intelligent interactive electronic whiteboard of claim 5, wherein the single chip microcomputer sends the new version package to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port after receiving the new version package; after receiving the new version package, the display control module starts upgrading, which specifically includes:
the single chip microcomputer sends the split packet to a display control module of the non-intelligent interactive electronic whiteboard through a second communication port when receiving the split packet; after the display control module receives one split packet, checking is carried out, and upgrading is started after successful checking; and when the display control module judges that the last unpacking packet is upgraded, sending an upgrading success message.
8. The upgrading method of a non-intelligent interactive electronic whiteboard of claim 1, wherein the first communication interface comprises a UART interface; the second communication port includes a USB interface.
9. An upgrading system of a non-intelligent interactive electronic whiteboard is characterized by comprising:
the OTA server is used for storing a new version package, OTA service software and upgrade file information which can be downloaded by the server;
the non-intelligent interactive electronic whiteboard comprises a singlechip, a network switch chip and a display control module; the single chip microcomputer comprises an RMII interface; the RMII interface is connected with a network switch chip so that the singlechip has a network connection function; the display control module does not comprise an OS operating system and does not have a network connection function; the single chip microcomputer is connected with the OTA server through a network to obtain a new version package; the single chip microcomputer is connected with the display control module through a USB port to send a new version package obtained from the OTA server, and the display control module starts upgrading after receiving the new version package.
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| CN113535209A (en) * | 2021-09-13 | 2021-10-22 | 广州朗国电子科技股份有限公司 | Interactive electronic whiteboard upgrading method and system |
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| WO2018121250A1 (en) * | 2016-12-30 | 2018-07-05 | 深圳创维－Rgb电子有限公司 | Remote system upgrading method utilized in smart apparatus |
| CN107621941A (en) * | 2017-09-22 | 2018-01-23 | 美的智慧家居科技有限公司 | Method for upgrading software, system and intelligent movable equipment |
| CN109189462A (en) * | 2018-08-07 | 2019-01-11 | 南京点触智能科技有限公司 | A kind of touch-control system with automatic upgrade function |
| CN111367542A (en) * | 2018-12-26 | 2020-07-03 | 博西华电器（江苏）有限公司 | Household appliance and household appliance firmware upgrading method |
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| CN113535209A (en) * | 2021-09-13 | 2021-10-22 | 广州朗国电子科技股份有限公司 | Interactive electronic whiteboard upgrading method and system |
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