JP3000895B2 - How to download - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a download method for downloading a program from a transmitting apparatus to a receiving apparatus, and particularly to a method for downloading a new program which differs from the downloaded current program only in part. Download methods that are valid for

[0002]

2. Description of the Related Art When downloading a program from a transmitting device to a receiving device, downloading a new program that differs only in part from the current program in order to upgrade the current program that has already been downloaded to the receiving device. However, conventionally, in general, all new programs are transmitted from the transmitting device to the receiving device. However, in this method, a portion having the same contents as the current program, that is, a portion that does not need to be transmitted is also transmitted, so that there is a problem that a lot of useless time is spent for downloading.

Japanese Patent Application Laid-Open No. 3-3443 discloses a technique described below as a technique for reducing the time required for downloading network status display data managed by a main processing device to a terminal device. Is described.

[0004] First, a terminal device divides the network status display data held by the terminal device into a plurality of data groups, and obtains a checksum of each data group. After that, a data group collective request signal with a checksum including a checksum of each data group is sent to the main processing unit.

When the main processing device receives a data group batch collection request signal with a checksum from the terminal device, the main processing device divides the network status display data held by itself into a plurality of data groups and checks each data group. Ask for Sam. afterwards,
The main processor compares the checksum of each data group held by the own device with the checksum included in the data group batch collection request signal with checksum sent from the terminal device. Compare. Then, if there is a checksum that does not match, only the data group corresponding to the checksum is sent to the terminal device.

[0006] In the terminal device, when a data group is sent from the main processing device, of the data group held in the terminal device,
The data group corresponding to the data group is replaced with the transmitted data group.

[0007]

If the above-mentioned conventional technique is applied to program download, the current program which has already been downloaded from the main processing apparatus which is the transmitting apparatus to the terminal apparatus which is the receiving apparatus, and a part of the program are downloaded. When downloading a new program that differs only in that only a part of the new program is transmitted, the new program can be downloaded to the receiving device. The time required for downloading the program can be shortened.

[0008] However, in the above-described conventional technique, since the checksum needs to be calculated by both the transmitting device and the receiving device, there is a problem that the download process is delayed due to the checksum calculation. Further, since the checksum is compared in the transmitting device, there is a problem that as the number of receiving devices increases, the load on the transmitting device increases.

[0009] Therefore, an object of the present invention is to perform checksum calculation only on the transmission side device, and it is possible to reduce an increase in load on the transmission side even when the number of reception side devices increases. The purpose is to provide a download method .

[0010]

According to the present invention, in order to achieve the above object, a current program is stored in a plurality of blocks of a predetermined size.
Checksum of each block and each block when divided into
And the backup area in which the
Area where the blocks stored in the area are loaded
A downloading method for downloading a program from the transmitting device to the receiving device with the transmitting side instrumentation
Location is to divide the new program to be downloaded to the receiving apparatus into a plurality of blocks of said predetermined size to calculate a checksum for each block, and sends the checksum for each was calculated block to the receiving side apparatus, wherein Receiver device
Is the current program stored in the backup area.
Checksum of each block of the gram
Check each block of the new program sent from
Compare the counterpart with the checksum and compare the checksum
Blocks of the new program that did not match and their blocks
Transmission of the checksum of the
Request, and the transmitting device requests a transmission from the receiving device.
The requested block and the checksum of that block
Transmitting to the receiving device , the receiving device checks, among the blocks of the current program stored in the backup area and the checksum of the block, the block and the checksum sent from the transmitting device. Are replaced with the checksum and the block sent from the transmitting side device, and when loading the program, all the blocks stored in the backup area are loaded into the operation area.

[0011]

When downloading a new program to a receiving device that has already downloaded the current program, the transmitting device first divides the new program into a plurality of blocks of a predetermined size and calculates a checksum of each block. , And sends the calculated checksum of each block to the receiving device.

When the checksum of each block of the new program is transmitted from the transmitting apparatus, the receiving apparatus transmits the checksum of each block of the new program and the current program stored in the backup area. The checksum of each block is compared with the corresponding checksum, and a request for transmission of the block of the new program in which the comparison result of the checksums does not match and the checksum of the block are sent to the transmission side device.

In response to the transmission request, the transmitting device
The block of the new program requested to be transmitted and the checksum of the block are transmitted to the receiving device.

[0014] When the receiving apparatus receives the block of the new program and the checksum of the block,
Among the blocks of the current program stored in the backup area and the checksum of the block, the block sent from the transmitting device, the block corresponding to the checksum, and the checksum sent from the transmitting device. Replace with When loading a program, all blocks stored in the backup area are loaded into the operation area.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. A transmitting apparatus 1 and a plurality of receiving apparatuses 2-1 to 2-n
Are connected via the network 3.

The transmitting device 1 includes a dividing unit 11, a transmission frame creating unit 12, a transmission frame storage area 13,
It comprises a control means 14 and a transmission / reception means 15.

The dividing means 11 includes receiving-side devices 2-1 to 2-
n is divided into a plurality of blocks of a predetermined size (for example, 256 bytes).

The transmission frame creating means 12 is composed of the dividing means 1
For each block of the program divided by 1, an Intellect H containing the contents of the block as data
It has a function of creating a transmission frame in the EX format and storing it in the transmission frame storage area 13.

FIG. 2 is a diagram showing a transmission frame in the Intellect HEX format.
The number of bytes 42 of the data to be transmitted, the start address 43 indicating the number of bytes from the start of the program to be downloaded, the record type 44, and the data 45 as the contents of the block. A checksum 46 of the data 45 and a CR (Carriage)
(Return Character) 47, LF
(Line Feed Character) 48.

The control means 14 controls the transmission frame storage area 1
Start address in each transmission frame stored in 3
3. A function of sequentially transmitting the checksums 46 to the receiving devices 2-1 to 2-n via the transmitting / receiving means 15, and transmitting / receiving a transmission frame requested to be transmitted from the receiving devices 2-1 to 2-n. It has a function of transmitting the request to the receiving side device via the means 15.

Further, the receiving side device 2-1 includes the transmitting / receiving means 2
1, a control unit 22, a comparison unit 23, a replacement unit 24, a backup area 25, a loading unit 26,
An operation area 27 is provided. In addition, the other receiving device 2-
2 to 2-n have the same configuration.

The backup area 25 is, for example, an EEP
When a current program is divided into a plurality of blocks in the same division unit (256 bytes) as the division unit (256 bytes) in the division means 11, a plurality of frames of the Intellect HEX format including the contents of each block as data are provided. Is stored. Now, for example, in the backup area 25, k frames 25-1 to 25 shown in FIG.
It is assumed that −k is stored.

The operation area 27 is composed of, for example, a RAM, and loads data (current program) in the frames 25-1 to 25-k stored in the backup area 25.

The control means 22 has a function of passing the pair of the start address and the checksum received by the transmitting / receiving means 21 to the comparing means 23, and the checksum passed to the comparing means 23 when the comparing means 23 is notified of a comparison mismatch. Activate the function of transmitting a transmission request including the paired head address to the transmitting device 1 via the transmission / reception means 21, the function of passing the transmission frame received by the transmission / reception means 21 to the replacement means 24, and the loading means 26. Has functions.

The comparing means 23 includes a checksum included in the pair of the start address and the checksum passed from the control means 22 and a checksum in the frame stored in the backup area 25. The control unit 2 compares the start address passed from the means 22 with the checksum in the frame including the same start address, and compares the comparison result with the control sum.
2 has the function of notifying it.

The loading means 26 includes a backup area 25
Has a function of sequentially loading the data in each frame stored in the operation area 27.

FIG. 4 is a flow chart showing a processing example of the transmitting apparatus 1, and FIG. 5 is a flow chart showing a processing example of the receiving apparatuses 2-1 to 2-n. The operation will be described.

Now, for example, consider a case where a new program obtained by upgrading the current program currently operating in the receiving device 2-1 is downloaded from the transmitting device 1 to the receiving device 2-1.

When downloading a new program from the transmitting device 1 to the receiving device 2-1, first, the transmitting device 1
The dividing means 11 in the file stores the new program in a predetermined size (256
Bytes), and each block is passed to the transmission frame creating means 12 (FIG. 4, step S1).

The transmission frame creating means 12 is provided with the dividing means 1
For each of the blocks of the new program passed from No. 1, a transmission frame of the Intellect HEX format as shown in FIG.
When the transmission frames corresponding to all the blocks are stored in the transmission frame storage area 13, the control unit 1
4 is notified (step S2). The transmission frame creation means 12 creates a transmission frame of the Intellect HEX format as shown in FIG.
Contains 256 bytes, and the head address 43 has 256 ×
(Numerical value -1 indicating the number of the frame from the top of the frame), the extension type is set in the record type 44, the content of the block is set in the data 45, and the checksum of the data 45 is set in the checksum 46. . Here, the checksum is obtained by actually performing a checksum calculation.

Now, for example, by performing the above-described processing, the new program is divided into k blocks, and k transmission frames 13-1 to 13-k shown in FIG. Let it be stored.

The control means 14 includes the transmission frame creation means 1
When the storage end of the transmission frames corresponding to all the blocks is notified from 2, the pair of the head address 43 and the checksum 46 in the first transmission frame 13-1 stored in the transmission frame storage area 13 is transmitted. (0, CS1) is transmitted to the receiving side device 2-1 using the transmission / reception means 15 (step S3).

The control means 22 in the receiving side apparatus 2-1 determines that the transmitting / receiving means 21 has a pair (0, CS) of the head address 43 and the checksum 46 in the first transmission frame 13-1.
When receiving 1), it is passed to the comparing means 23 (FIG. 5,
Step S11).

The comparing means 23 calculates the pair (0, CS
When 1) is passed, the checksum CS1 included in the pair and the checksum in the frame stored in the backup area 25 are the same as the start address “0” passed from the control unit 22. The checksum in the frame including the start address is compared, and the comparison result is notified to the control unit 22.

In the backup area 25, as described above, k frames 25-1 to 25- as shown in FIG.
Since k is stored, the comparing means 23 checks the checksum CS1 in the frame 25-1 whose head address is 0 and the checksum CS1 passed from the control means 22.
1 and the control unit 22 is notified of the comparison result. In this case, since both the checksums are CS1, the comparing means 23 notifies the comparison match.
Here, the comparison of the checksums is performed to determine whether it is necessary to actually transfer the block of the new program corresponding to the compared checksums. In other words, the blocks of the new program and the current program that have the same checksum have the same contents, and do not need to be transferred.
This is because only blocks whose checksums do not match are transferred to reduce the time required for downloading.

When the control unit 22 is notified of the comparison match (step S12), the control unit 22 waits for the transmission / reception unit 21 to receive the next pair of the head address 43 and the checksum 46 (step S15). Step S11 is performed.

On the other hand, the control means 14 in the transmitting apparatus 1
Start address 43 in first transmission frame 13-1
If the transmission request is not sent from the receiving side device 2-1 even if a predetermined time has elapsed since the transmission of the pair (0, CS1) with the checksum 46 (FIG. 4, step S4 is NO),
The pair (255, CS2 ') of the start address 43 and the checksum 46 in the next second transmission frame 13-2 is transmitted to the receiving device 2-1 (step S3).

The control means 22 in the receiving side apparatus 2-1 determines that the transmitting / receiving means 21 has a pair (255, C) of the head address 43 and the checksum 46 in the second transmission frame 13-2.
When S2 ') is received, it is passed to the comparing means 23 (FIG. 5, step S11).

When the pair (255, CS2 ') of the start address 43 and the checksum 46 is passed, the comparing means 23 checksums CS2 in the second frame 25-2 in which the start address is 255. And control means 22
Is compared with the checksum CS2 'passed from. In this case, the checksums are CS2 and CS2 ', which are different, so that the comparing means 23 notifies the control means 22 of the comparison mismatch.

When the comparison unit 23 is notified of the comparison mismatch (step S12: NO), the control unit 22 requests the transmission-side apparatus 1 to transmit a transmission frame including the head address "255". Is waited for (step S13).

When the transmitting / receiving means 15 receives the above-mentioned transmission request, the control means 14 in the transmitting side apparatus 1 (step S
4 is YES), out of the transmission frames 13-1 to 13-k stored in the transmission frame storage area 13, the transmission frame having the same start address as the start address "255" included in the transmission request (FIG. 6). In the case of the example (2), the second transmission frame 13-2) is transmitted to the reception side device 2-1 using the transmission / reception means 15 (step S5).

When the second transmission frame 13-2 is sent from the transmitting device 1, the control means 22 in the receiving device 2-1 sends the transmission frame 13-2 to the replacing means 24.
To perform a replacement process (step S14).

The replacement means 24 transmits the transmission frame 13-
2, the frame having the same start address as the start address “255” included in the transmission frame 13-2 among the frames stored in the backup area 25 (the frame 25 in the example of FIG. 3). -2)
Is replaced by the transmission frame 13-2.

Thereafter, the transmitting apparatus 1 repeats the same processing as described above, and performs the above processing for all the transmission frames (step S6), and then terminates the processing for the receiving apparatus 2-1. Notify (step S7).

The receiving device 2-1 repeats the same processing as described above, and when the transmitting device 1 notifies the end of the process (step S15), the process is terminated.

By performing the above processing, the backup area 25 stores a plurality of frames each containing the contents of each block when the new program is divided into a plurality of blocks each having 256 bytes. Become.

Thereafter, when the control means 22 is instructed to load the program, the control means 22 activates the load means 26. The loading means 26 loads only the data 45 in each frame stored in the backup area 25 into the operation area 27 by being activated. As a result, the receiving device 2-1 performs processing according to the new program.

[0049]

As described above, the present invention has a backup area for storing a pair of each block and a checksum of each block when the current program is divided into a plurality of blocks of a predetermined size. The side device compares the checksum stored in the backup area with the checksum sent from the sending device when comparing with the checksum, and checks the blocks in the backup area if they do not match. Since the pair with the sum is replaced with the pair of the transmitted block and the checksum, it is not necessary to calculate the checksum on the receiving device, and the download is accordingly required. Time can be shortened.

Also, according to the present invention, the checksum is compared in the receiving device, so that the checksum is compared in the transmitting device even when the number of receiving devices is large. The load on the transmitting apparatus can be reduced as compared with the technology.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a transmission frame.

FIG. 3 is a diagram showing an example of the contents of a backup area 25;

FIG. 4 is a flowchart illustrating a processing example of the transmission-side apparatus 1.

FIG. 5 is a flowchart illustrating a processing example of receiving-side devices 2-1 to 2-n.

FIG. 6 is a diagram showing an example of the contents of a transmission frame storage area 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transmission-side apparatus 11 ... Division means 12 ... Transmission-frame creation means 13 ... Transmission-frame storage area 14 ... Control means 15 ... Transmission / reception means 2-1 to 2-n ... Reception-side apparatus 21 ... Transmission / reception means 22 ... Control means 23 ... Comparison means 24 Replacement means 25 Backup area 26 Loading means 27 Operation area 3 Network

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 9 / 06,13 / 00

Claims (3)

(57) [Claims] (1)Copy the current program to multiple
Check each block and each block when divided into blocks
And a backup area in which the sum is stored.
Area where blocks stored in the loop area are loaded
From the sending device to the receiving device withProgram
Download to downloadThe method The transmitting device downloads to the receiving device
 A new programSaidDivided into multiple blocks of a given size
To calculate the checksum of each block.
Sending a lock checksum to the receiving device., The receiving device is stored in the backup area
Checksum and previous of each block of the current program
Each block of the new program sent from the transmitting device
Compare the lock checksum with its counterpart and check
Checksum of the new program,
Transmission of the block and checksum of the block
Request to the side device, The transmitting device is requested to transmit from the receiving device.
The block and the checksum of the block
To the device, The receiving device, Stored in the backup area
Check the current program block and its block
Of the sum, the block sent from the transmitting device
And the one corresponding to the checksum from the transmitting side device.
Replace the sent block with the checksum,
When loading a program, it is stored in the backup area.
Load all blocks in the operation area
Download featuringMethod. 2. The transmitting device according to claim 1, wherein said transmitting device is an Intellect HEX.
The download method according to claim 1, wherein the block and a checksum of the block are transmitted to the receiving side device by a transmission frame in a format. 3. The download method according to claim 2, wherein said backup area comprises an EEPROM.