CN112700814B - EEPROM data reading method and device, electronic control equipment and medium - Google Patents

Abstract

The embodiment of the invention discloses a method and a device for reading EEPROM data, electric control equipment and a medium. The reading method comprises the following steps: after the vehicle electronic control unit is electrified, a sector magnetic head corresponding to a current nonvolatile memory data block is obtained; determining a sector range of a current active partition based on the sector head, and determining a target nonvolatile memory data block according to the sector range; and determining address information corresponding to the target nonvolatile memory data block according to the target nonvolatile memory data block, and copying the programmable read-only memory data into a random access memory according to the address information. The technical scheme of the embodiment of the invention shortens the determination time of the effective data address and improves the initial response time of the actuator.

Description

EEPROM data reading method, device, electronic control equipment and medium

Technical Field

The embodiments of the present invention relate to the field of engine electronic control technology, and in particular to a method, device, electronic control equipment and medium for reading EEPROM data.

Background Art

Currently, most vehicle controllers rely on non-volatile memory (FLASH) to store EEPROM data, but the sizes of FLASH data blocks of different microcontrollers are different, which leads to different controllers taking different times to read EEPROM data.

During the power-on initialization process, the vehicle ECU (Electronic Control Unit) determines the valid data address location by sequential addressing, that is, addressing and parsing from top to bottom. The addressing time varies according to the size of the FLASH data block. When the FLASH data block is too large and the stored data is close to the end address of the FLASH data block, the initialization time will be too long, which in turn affects the initialization time of the vehicle controller. At the same time, some actuator actions cannot respond in time.

Summary of the invention

The embodiments of the present invention provide a method, device, electronic control equipment and medium for reading EEPROM data, so as to shorten the time for determining a valid data address and improve the initial response time of an actuator.

In a first aspect, an embodiment of the present invention provides a method for reading EEPROM data, the method comprising:

After the vehicle electronic control unit is powered on, the sector head corresponding to the current non-volatile memory data block is obtained;

Determining a sector range of a current active partition based on the sector head, and determining a target non-volatile memory data block according to the sector range;

The address information corresponding to the target non-volatile memory data block is determined according to the target non-volatile memory data block, and the programmable read-only memory data is copied to the random access memory according to the address information.

In a second aspect, an embodiment of the present invention further provides a device for reading EEPROM data, the device comprising:

The sector head determination module is used to obtain the sector head corresponding to the current non-volatile memory data block after the vehicle electronic control unit is powered on;

a target non-volatile memory data block determination module, configured to determine a sector range of a current active partition based on the sector head, and determine a target non-volatile memory data block according to the sector range;

The data reading module is used to determine the address information corresponding to the target non-volatile memory data block according to the target non-volatile memory data block, and copy the programmable read-only memory data to the random access memory according to the address information.

In a third aspect, an embodiment of the present invention further provides an electric control device, the electric control device comprising:

one or more processors;

A storage device for storing a plurality of programs,

When at least one of the multiple programs is executed by the one or more processors, the one or more processors implement the EEPROM data reading method provided by the embodiment of the first aspect of the present invention.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for reading EEPROM data provided in the embodiment of the first aspect of the present invention.

The technical solution of the embodiment of the present invention is to obtain the sector head corresponding to the current non-volatile memory data block after the vehicle electronic control unit is powered on; determine the sector range of the current active partition based on the sector head, and determine the target non-volatile memory data block according to the sector range; determine the address information corresponding to the target non-volatile memory data block according to the address information, and copy the programmable read-only memory data to the random access memory according to the address information, thereby solving the problem that the existing vehicle ECU determines the valid data address position by sequential addressing, resulting in a long EEPROM data reading time, so as to shorten the determination time of the valid data address and improve the initial response time of the actuator.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of a method for reading EEPROM data provided by Embodiment 1 of the present invention;

2 is a flow chart of a method for reading EEPROM data provided by Embodiment 2 of the present invention;

3 is a structural diagram of an EEPROM data reading device provided in Embodiment 3 of the present invention;

FIG. 4 is a schematic diagram of the hardware structure of an electric control device provided in Embodiment 4 of the present invention.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention clearer, the specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, rather than to limit the present invention.

It should also be noted that, for ease of description, only the part relevant to the present invention but not all the content is shown in the accompanying drawings. It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as the processing or method described as a flow chart. Although the flow chart describes each operation (or step) as a sequential processing, many operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. When its operation is completed, the processing can be terminated, but it can also have additional steps not included in the accompanying drawings. The processing can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

Embodiment 1

FIG1 is a flow chart of a method for reading EEPROM data provided by Embodiment 1 of the present invention. This embodiment is applicable to the case of quickly reading data from a programmable read-only memory. The method can be executed by an EEPROM data reading device, which can be implemented in the form of software and/or hardware. Specifically, the method comprises the following steps:

S110: After the vehicle electronic control unit is powered on, a sector head corresponding to the current non-volatile memory data block is obtained.

Among them, the current non-volatile memory data block is the current Flash data block. The current Flash data block is 64Kb, then the EEPdata area simulated by the current Flash data block is 8Kb. There are 8 current Flash data blocks in total, which can be set to block0, block1, block2...block7 respectively. The length of each current Flash data block is 1024 words.

In the art, each track is cut into arcs of equal length, namely sectors. Each sector stores 512B of data and some other information, such as storage location identifiers: the cylinder (Cylinder) where the sector is located, the head (Header) and the sector (Sector).

The sector head is used to read the mask of the current non-volatile memory data block. It can be understood that each non-volatile memory data block corresponds to a mask, and the mask of each non-volatile memory data block is used to record the location information of the non-volatile memory data block.

In this embodiment, before the vehicle electronic control unit is powered on, the method further includes: writing a historical non-volatile memory data block, and updating the first address information of the historical non-volatile memory data block to the corresponding mask area.

Furthermore, before updating the historical address information of the historical non-volatile memory data block to the corresponding mask area, it also includes: calculating the checksum of the historical non-volatile memory data block and writing it into the first address of the historical non-volatile memory data block; determining the mask area of the historical non-volatile memory data block based on the checksum and the first address.

Specifically, obtaining the sector head corresponding to the current non-volatile memory data block includes: obtaining a four-dimensional array corresponding to the current non-volatile memory data block, and sequentially reading the sector heads corresponding to the four-dimensional array.

S120: Determine a sector range of a current active partition based on the sector head, and determine a target non-volatile memory data block according to the sector range.

Among them, the current active partition is the active disk in the hard disk partition.

The target non-volatile memory data block is data within a sector range. The target non-volatile memory data block is a plurality of data blocks divided from the current non-volatile memory data block. The number of target non-volatile memory data blocks is multiple, and the current non-volatile memory data block can be obtained by combining multiple target non-volatile memory data blocks. In this embodiment, by dividing a larger current non-volatile memory data block into multiple blocks, the EEPROM data reading time is shortened.

Specifically, after obtaining the four-dimensional array corresponding to the current non-volatile memory data block and sequentially reading the sector heads corresponding to the four-dimensional array, the sector range of the current active partition is determined by parsing the four-dimensional array according to the sector heads.

S130, determining address information corresponding to the target non-volatile memory data block, and copying the programmable read-only memory data to the random access memory according to the address information.

Based on the above embodiment, the address information corresponding to the target non-volatile memory data block is determined, including: parsing the target non-volatile memory data block to read the mask information of the target non-volatile memory data block, and determining the address information corresponding to the target non-volatile memory data block according to the mask information.

Furthermore, after determining the address information corresponding to the target non-volatile memory data block, it also includes: writing the address information into the NVM structure array in sequence; correspondingly, copying the programmable read-only memory data to the random access memory according to the address information, including: reading the address information from the NVM structure array by calling the read function of the programmable read-only memory, and copying the programmable read-only memory data corresponding to the address information to the random access memory.

The technical solution of the embodiment of the present invention is to obtain the sector head corresponding to the current non-volatile memory data block after the vehicle electronic control unit is powered on; determine the sector range of the current active partition based on the sector head, and determine the target non-volatile memory data block according to the sector range; determine the address information corresponding to the target non-volatile memory data block according to the address information, and copy the programmable read-only memory data to the random access memory according to the address information, thereby solving the problem that the existing vehicle ECU determines the valid data address position by sequential addressing, resulting in a long EEPROM data reading time, so as to shorten the determination time of the valid data address and improve the initial response time of the actuator.

Embodiment 2

FIG. 2 is a flow chart of a method for reading EEPROM data provided in a second embodiment of the present invention. This embodiment is optimized based on the above embodiment.

Accordingly, the method of this embodiment specifically includes:

S210, writing a historical non-volatile memory data block, and updating the first address information of the historical non-volatile memory data block to the corresponding mask area.

Furthermore, before updating the historical address information of the historical non-volatile memory data block to the corresponding mask area, it also includes: calculating the checksum of the historical non-volatile memory data block and writing it into the first address of the historical non-volatile memory data block; determining the mask area of the historical non-volatile memory data block based on the checksum and the first address.

The historical non-volatile memory data block is data pre-stored in a sector, and the sector information corresponding to the historical non-volatile memory data block may include a mask of the historical non-volatile memory data block and historical non-volatile memory data block information.

Specifically, the process of storing the historical non-volatile memory data block is to first write the historical non-volatile memory data block, calculate its checksum and write the first address of the historical non-volatile memory data block, check the mask to which the current checksum first address belongs, and update the mask position information of this historical non-volatile memory data block to the mask area corresponding to the historical non-volatile memory data block. Each historical non-volatile memory data block corresponds to a corresponding number of mask area positions with different numbers, which are updated in sequence.

S220. After the vehicle electronic control unit is powered on, obtain the four-dimensional array corresponding to the current non-volatile memory data block, and read the sector heads corresponding to the four-dimensional array in sequence.

S230: Determine the sector range of the current active partition by parsing the four-dimensional array according to the sector head, and determine the target non-volatile memory data block according to the sector range.

S240: parse the target non-volatile memory data block to read mask information of the target non-volatile memory data block, and determine address information corresponding to the target non-volatile memory data block according to the mask information.

Exemplarily, the current non-volatile memory data block is divided into 1024-byte blocks to obtain a target non-volatile memory data block. Accordingly, the current non-volatile memory data block is divided into 64 blocks, that is, 64 target non-volatile memory data blocks are obtained, and the mask information is marked in sequence as mask 0, mask 1, mask 2, mask 3...mask 63.

Furthermore, in this embodiment, a mask is used for mask recording, and only 64 bits, that is, 8 bytes, are needed to completely record the address information of the non-volatile memory data block, that is, the position information in the mask area.

For example, see Table 1 below, which is a table showing the correspondence between the non-volatile memory data block block and the mask. In combination with Table 1, it can be seen that in the solution of this embodiment, when the non-volatile memory data block block1 uses the third address block when storing, that is, bit 0-bit 2 is written from 1 to 0, and when the non-volatile memory data block block4 uses the 30th address block when storing, that is, bit 0-29 is written from 1 to 0. Since the address information of the non-volatile memory data block can only be written from 1 to 0, and is irreversible, the address can only become larger and larger, and the bit positions from 0 to 63 are all written as 0, which means that the current non-volatile memory data block is fully occupied.

Table 1 is a schematic diagram of the correspondence between non-volatile memory data blocks and masks

S250, writing the address information into the NVM structure array in sequence.

S260, reading the address information from the NVM structure array by calling a read function of the programmable read-only memory, and copying the programmable read-only memory data corresponding to the address information to a random access memory.

The technical solution of the embodiment of the present invention divides a large non-volatile memory data block into small address blocks, and uses a mask address to encode information, accurately encodes the specific location information of the non-volatile memory data block, and the ECU can quickly determine the valid data position of the current non-volatile memory data block by parsing the mask when it is powered on, and directly copy the valid data to the corresponding non-volatile memory data block address. This avoids the problem that when the non-volatile memory data block is too large, the ECU takes too long to address the valid data from top to bottom when it is powered on, and quickly determines the current valid data position without relying on a lot of time wasted by sequential address interpretation, shortening the time to determine the valid data address. At the same time, the non-volatile memory data is directly copied to the destination address without using a mirror random access memory, which reduces the program initialization running time, advances the actuator action time, and reduces the difference and excessive length of the controller initialization time.

Embodiment 3

FIG. 3 is a structural diagram of an EEPROM data reading device provided in a third embodiment of the present invention. This embodiment is applicable to the case of quickly reading data from a programmable read-only memory.

As shown in FIG3 , the reading device comprises: a sector head determination module 310, a target non-volatile memory data block determination module 320 and a data reading module 330, wherein:

The sector head determination module 310 is used to obtain the sector head corresponding to the current non-volatile memory data block after the vehicle electronic control unit is powered on;

A target non-volatile memory data block determination module 320, configured to determine a sector range of a current active partition based on the sector head, and determine a target non-volatile memory data block according to the sector range;

The data reading module 330 is used to determine the address information corresponding to the target non-volatile memory data block according to the target non-volatile memory data block, and copy the programmable read-only memory data to the random access memory according to the address information.

The EEPROM data reading device of the present embodiment obtains the sector head corresponding to the current non-volatile memory data block after the vehicle electronic control unit is powered on; determines the sector range of the current active partition based on the sector head, and determines the target non-volatile memory data block according to the sector range; determines the address information corresponding to the target non-volatile memory data block according to the address information, and copies the programmable read-only memory data to the random access memory according to the address information, thereby solving the problem that the existing vehicle ECU determines the valid data address position by sequential addressing, resulting in a long EEPROM data reading time, so as to shorten the determination time of the valid data address and improve the initial response time of the actuator.

Based on the above embodiments, before the vehicle electronic control unit is powered on, the method further includes:

The historical non-volatile memory data block is written, and the first address information of the historical non-volatile memory data block is updated to the corresponding mask area.

Based on the above embodiments, before updating the historical address information of the historical non-volatile memory data block to the corresponding mask area, the method further includes:

Calculating a checksum of the historical non-volatile memory data block and writing it into the first address of the historical non-volatile memory data block;

A mask area of the historical non-volatile memory data block is determined according to the checksum and the first address.

On the basis of the above embodiments, obtaining the sector head corresponding to the current non-volatile memory data block includes:

A four-dimensional array corresponding to the current non-volatile memory data block is obtained, and sector heads corresponding to the four-dimensional array are read in sequence.

On the basis of the above embodiments, determining the sector range of the current active partition based on the sector head includes:

The sector range of the current active partition is determined by parsing the four-dimensional array according to the sector head.

Based on the above embodiments, determining address information corresponding to the target non-volatile memory data block includes:

The target non-volatile memory data block is parsed to read mask information of the target non-volatile memory data block, and address information corresponding to the target non-volatile memory data block is determined according to the mask information.

On the basis of the above embodiments, after determining the address information corresponding to the target non-volatile memory data block, the method further includes:

Writing the address information into the NVM structure array in sequence;

Accordingly, copying the programmable read-only memory data to the random access memory according to the address information includes:

The address information is read from the NVM structure array by calling a read function of the programmable read-only memory, and the programmable read-only memory data corresponding to the address information is copied to the random access memory.

The EEPROM data reading device provided in the above embodiments can execute the EEPROM data reading method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the EEPROM data reading method.

Embodiment 4

Figure 4 is a schematic diagram of the structure of an electronic control device provided in Embodiment 4 of the present invention. As shown in Figure 4, the electronic control device includes a processor 410, a memory 420, an input device 430 and an output device 440; the number of processors 410 in the electronic control device can be one or more, and Figure 4 takes one processor 410 as an example; the processor 410, memory 420, input device 430 and output device 440 in the electronic control device can be connected via a bus or other means, and Figure 4 takes connection via a bus as an example.

The memory 420, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions/modules corresponding to the method for reading EEPROM data in the embodiment of the present invention (for example, the sector head determination module 310, the target non-volatile memory data block determination module 320 and the data reading module 330 in the device for reading EEPROM data). The processor 410 executes various functional applications and data processing of the electronic control device by running the software programs, instructions and modules stored in the memory 420, that is, realizes the above-mentioned method for reading EEPROM data.

The memory 420 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 420 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 420 may further include a memory remotely arranged relative to the processor 410, and these remote memories may be connected to the electric control device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The input device 430 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the electronic control device. The output device 440 may include a display device such as a display screen.

Embodiment 5

Embodiment 5 of the present invention further provides a storage medium including computer executable instructions, wherein the computer executable instructions are used to execute a method for reading EEPROM data when executed by a computer processor, the method comprising:

After the vehicle electronic control unit is powered on, the sector head corresponding to the current non-volatile memory data block is obtained;

Determining a sector range of a current active partition based on the sector head, and determining a target non-volatile memory data block according to the sector range;

The address information corresponding to the target non-volatile memory data block is determined according to the target non-volatile memory data block, and the programmable read-only memory data is copied to the random access memory according to the address information.

Of course, the computer executable instructions of a storage medium including computer executable instructions provided by an embodiment of the present invention are not limited to the method operations described above, and can also execute related operations in the EEPROM data reading method provided by any embodiment of the present invention.

Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

It is worth noting that in the embodiment of the above-mentioned EEPROM data reading device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (8)

1. A method of reading EEPROM data, comprising:

Writing a historical nonvolatile memory data block, and updating the head address information of the historical nonvolatile memory data block to a corresponding mask area;

Wherein before updating the history address information of the history nonvolatile memory data block to the corresponding mask area, the method further comprises: calculating the checksum of the historical nonvolatile memory data block and writing the checksum into the first address of the historical nonvolatile memory data block; determining a mask area of the historical nonvolatile memory data block according to the checksum and the head address;

After the vehicle electronic control unit is electrified, a sector magnetic head corresponding to a current nonvolatile memory data block is obtained;

Determining a sector range of a current active partition based on the sector head, and determining a target nonvolatile memory data block according to the sector range; the target nonvolatile memory data block is a plurality of data blocks divided by the current nonvolatile memory data block;

and determining address information corresponding to the target nonvolatile memory data block according to the target nonvolatile memory data block, and copying the programmable read-only memory data into a random access memory according to the address information.

2. The method of claim 1, wherein obtaining a sector head corresponding to a current nonvolatile memory block of data comprises:

And acquiring a four-dimensional number array corresponding to the current nonvolatile memory data block, and sequentially reading a sector magnetic head corresponding to the four-dimensional number array.

3. The method of claim 2, wherein determining the sector range of the current active partition based on the sector head comprises:

and determining the sector range of the current active partition by analyzing the four-dimensional number array according to the sector magnetic head.

4. The method of claim 1, wherein determining address information corresponding to the target nonvolatile memory data block from the target nonvolatile memory data block comprises:

and analyzing the target nonvolatile memory data block to read mask information of the target nonvolatile memory data block, and determining address information corresponding to the target nonvolatile memory data block according to the mask information.

5. The method of claim 1, further comprising, after determining address information corresponding to the target nonvolatile memory data block from the target nonvolatile memory data block:

Writing the address information into an NVM structure array in sequence;

Correspondingly, copying the programmable read-only memory data into the random access memory according to the address information comprises the following steps:

and reading the address information from the NVM structure body array by calling a read function of the programmable read-only memory, and copying the programmable read-only memory data corresponding to the address information into the random access memory.

6. An EEPROM data reading apparatus, comprising:

Writing a historical nonvolatile memory data block, and updating the head address information of the historical nonvolatile memory data block to a corresponding mask area;

Wherein before updating the history address information of the history nonvolatile memory data block to the corresponding mask area, the method further comprises: calculating the checksum of the historical nonvolatile memory data block and writing the checksum into the first address of the historical nonvolatile memory data block; determining a mask area of the historical nonvolatile memory data block according to the checksum and the head address;

The sector magnetic head determining module is used for acquiring a sector magnetic head corresponding to a current nonvolatile memory data block after the vehicle electronic control unit is electrified;

The target nonvolatile memory data block determining module is used for determining the sector range of the current active partition based on the sector magnetic head and determining a target nonvolatile memory data block according to the sector range; the target nonvolatile memory data block is a plurality of data blocks divided by the current nonvolatile memory data block;

and the data reading module is used for determining address information corresponding to the target nonvolatile memory data block according to the target nonvolatile memory data block and copying the programmable read-only memory data into the random access memory according to the address information.

7. An electronic control device, characterized in that the electronic control device comprises:

One or more processors;

a storage means for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method of reading EEPROM data as claimed in any one of claims 1 to 5.

8. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements a method of reading EEPROM data according to any one of claims 1-5.