CN110941394A - Data reading and writing method and device for automatic train control system - Google Patents
Data reading and writing method and device for automatic train control system Download PDFInfo
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
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- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
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- G06F3/0619—Improving the reliability of storage systems in relation to data integrity, e.g. data losses, bit errors
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
Abstract
The embodiment of the invention provides a data reading and writing method and a device of an automatic train control system, wherein the method comprises the following steps: receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in the ferroelectric memory corresponding to the target data; determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address; executing read-write operation aiming at the target data based on the number of the target data block; the ferroelectric memory is divided into two large areas, namely a first area and a second area, and each large area is divided into at least three sub-areas, namely a first sub-area, a second sub-area and a third sub-area. According to the data reading and writing method and device for the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, the redundant backup and automatic repair functions of the data are realized under the condition of optimizing the data to be read and written quickly and reliably, and the performance and the availability of the system are improved.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a data reading and writing method and device for an automatic train control system.
Background
The automatic control ATC system of the train is an important component in a railway signal system and plays an important role in safe operation and automatic driving of the train. During the operation of the ATC system, a large amount of data needs to be stored and recorded, and the data mainly comprises the following types of data: software program data, device parameter data, device state data, and operation record data.
In the prior art, a Flash chip is generally used for storing software programs, an Electrically Erasable and Programmable Read Only Memory (EEPROM) is generally used for storing device parameter data, an additional recording board is generally used for storing device state data and operation recording data, and a storage medium of the recording board can be realized in various ways such as the Flash chip, a Solid State Disk (SSD), a hard disk drive (HD), a Compact Flash (CF) card and an SD card.
However, in practical engineering applications, since the performance indexes of each vehicle may not be completely the same, different train IDs are used to distinguish different trains, which results in that the device parameter data in each on-board ATC is different and is a set of parameters specific to each ATC device. At present, parameter data of storage equipment is stored in an EEPROM manner, but is limited by an EEPROM storage principle and serial communication protocol rates of SPI, I2C and the like, so that the parameter data are read and written slowly, and the starting speed, the storage efficiency and the user experience of the equipment are influenced. In addition, the train running condition is complex, and power supply or power failure can be frequently switched without signs, so that the parameter reading and writing are required to be reliable and fast, and the condition that the parameter data record is incomplete or lost due to power failure is avoided.
Disclosure of Invention
The embodiment of the invention provides a data reading and writing method and device for an automatic train control system, which are used for solving the technical problem of low data reading and writing speed of an ATC system in the prior art.
In order to solve the above technical problem, in one aspect, an embodiment of the present invention provides a data reading and writing method for an automatic train control system, including:
receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data;
determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address;
executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
Further, the determining, according to the target address, a number of a target data block corresponding to the target address in the ferroelectric memory specifically includes:
searching index identification in a first subarea of a first area of the ferroelectric memory, and determining the number of the target data block;
wherein the index identifier comprises a start address, an end address and a number of each data block in the second sub-area, and the target address is between the start address and the end address of the target data block.
Further, the executing, based on the number of the target data block, a read-write operation for the target data specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
Further, the executing, based on the number of the target data block, a read-write operation for the target data specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is different from the currently read check code, discarding the currently read target data and the currently read check code;
reading the target data block from the second subarea of the second area of the ferroelectric memory based on the number of the target data block again, and reading a check code corresponding to the target data block from the third subarea of the second area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
Further, the executing, based on the number of the target data block, a read-write operation for the target data specifically includes:
when the write operation is executed to the target data, the following steps are executed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block;
writing the target data to the ferroelectric memory based on the new data block.
Further, the writing the target data into the ferroelectric memory based on the new data block specifically includes:
storing new data blocks into a second sub-area of the first area and a second sub-area of the second area of the ferroelectric memory, respectively;
calculating a new check code according to the new data block;
and replacing the check codes corresponding to the target data block stored in the third subarea of the first area and the third subarea of the second area of the ferroelectric memory by using the new check codes, and returning a writing success mark.
Further, the writing the target data into the ferroelectric memory based on the new data block specifically includes:
calculating a new check code according to the new data block;
storing a new data block into a second sub-area of the first area of the ferroelectric memory, and replacing the check code corresponding to the target data block stored in a third sub-area of the first area of the ferroelectric memory with a new check code;
reading the new data block from the second sub-area of the first area of the ferroelectric memory and the new check code from the third sub-area of the first area of the ferroelectric memory;
and if the check code calculated according to the new data block read currently is the same as the new check code read currently, storing the new data block into a second subarea of the second area of the ferroelectric memory, replacing the check code corresponding to the target data block stored in a third subarea of the second area of the ferroelectric memory with the new check code, and returning a writing success mark.
On the other hand, an embodiment of the present invention provides a data read/write apparatus for an automatic train control system, including:
the receiving module is used for receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in the ferroelectric memory corresponding to the target data;
a determining module, configured to determine, according to the target address, a number of a target data block in the ferroelectric memory, where the target data block corresponds to the target address;
the read-write module is used for executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
In another aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.
In yet another aspect, the present invention provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above method.
According to the data reading and writing method and device for the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, the redundant backup and automatic repair functions of the data are realized under the condition of optimizing the data to be read and written quickly and reliably, and the performance and the availability of the system are improved.
Drawings
Fig. 1 is a schematic diagram of a data reading and writing method of an automatic train control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a data read/write logic flow of an automatic train control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a data verification logic flow of an automatic train control system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data read-write device of an automatic train control system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The vehicle-mounted ATC device has a high requirement on data security, and usually a cyclic redundancy check CRC check code is additionally stored in the data storage device to check and protect all stored parameter data. However, when the EEPROM is used to store data, the CRC check protection is performed on the data, and whether parameters are read or written, all the parameters must be completely read to perform the CRC check, which seriously affects the read/write speed and cannot perform the read/write operation on a certain parameter quickly. In addition, if any error exists in the stored parameters, all the parameters are in an unreliable state, and the system availability is affected.
The ferroelectric memory has a series of advantages of long service life, radiation resistance, high-speed random read-write, low power consumption, high reliability, no loss of power failure data and the like, and integrates the dual advantages of the RAM and the ROM.
The embodiment of the invention adopts the ferroelectric memory to replace the EEPROM, and can well solve the problem.
Fig. 1 is a schematic diagram of a data read-write method of an automatic train control system according to an embodiment of the present invention, and as shown in fig. 1, the embodiment of the present invention provides a data read-write method of an automatic train control system, and an execution main body of the data read-write method is data read-write of the automatic train control system. The method comprises the following steps:
step S101, receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data.
Specifically, in the embodiment of the present invention, a ferroelectric memory is used as a storage medium for data of an automatic train control system, the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is divided into at least three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, each sub-area in the first area is completely identical to data stored in a corresponding sub-area in the second area, so that the first area and the second area are backed up with each other, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block, such as a CRC check.
Table 1 shows a logical partition layout of a ferroelectric memory according to an embodiment of the present invention, and as shown in table 1, the table 1 takes a ferroelectric memory with a capacity of 256KByte as an example, and divides a ferroelectric memory with a capacity of 256KByte into two large areas, namely a first area (a area) and a second area (B area), so as to implement a data redundancy storage function, and then divides each large area into four sub-areas, namely an index identification area, a device parameter area, a key Log area, and a CRC check area, where the CRC check area stores CRC32 check codes of three data areas, namely the index identification area, the device parameter area, and the key Log area, and each of the three data areas separately generates a CRC32 check code for every 256Byte data, and so on, 504 CRC check codes are generated and sequentially stored in the CRC check area, and each CRC32 check code occupies a 4Byte space. The device parameter area and the key Log area are used for storing service data, wherein the device parameter area is used for storing device parameters, a user in the key Log area stores the key Log, and the service data in the two sub-areas are stored in a form of a data block with a preset size.
Table 1 is a layout of logical partitions of a ferroelectric memory according to an embodiment of the present invention
When reading and writing operation needs to be carried out on target data, reading and writing instruction information aiming at the target data is received, and the reading and writing instruction information comprises a target address in the ferroelectric memory corresponding to the target data.
For example, when a read/write operation is performed on the data1, and the address corresponding to the data1 in the ferroelectric memory is 0000H, the read/write command information for the data1 includes the address 0000H.
And step S102, determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address.
Specifically, service data such as device parameters and key logs are stored in the ferroelectric memory in the form of data blocks in the second sub-area, where one data block includes a plurality of bytes, for example, 256 bytes, and reading and writing of data is performed in units of the data block, and if it is necessary to perform a read/write operation on one Byte in a certain data block, it is necessary to perform a read/write operation on the data block as a whole.
Therefore, after the target address of the target data is determined, the number of the target data block corresponding to the target address in the ferroelectric memory needs to be determined according to the target address.
And step S103, executing read-write operation aiming at the target data based on the number of the target data block.
Specifically, after the number of the target data block is determined, a read-write operation for the target data is performed for the target data block.
And if the target data is read, the target data block contains the target data, the whole target data block is read, and the target data is extracted from the target data block.
And if the write operation is performed on the target data, reading the whole target data block, covering the data with the target address in the target data block by using the target data to obtain a new data block, and writing the new data block into a second subarea of the ferroelectric memory to complete the write operation on the target data.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the determining, according to the target address, a number of a target data block in the ferroelectric memory corresponding to the target address specifically includes:
searching index identification in a first subarea of a first area of the ferroelectric memory, and determining the number of the target data block;
wherein the index identifier comprises a start address, an end address and a number of each data block in the second sub-area, and the target address is between the start address and the end address of the target data block.
Specifically, after the target address of the target data is determined, the number of the target data block corresponding to the target address in the ferroelectric memory needs to be determined based on the target address.
The first subarea of the ferroelectric memory is used for storing index identification, the index identification comprises a starting address, an ending address and a number of each data block in the second subarea, when the number of a target data block corresponding to a target address in the ferroelectric memory is determined, the index identification in the first subarea of the ferroelectric memory is searched, the number of the target data block is determined, and the target address is between the starting address and the ending address of the target data block.
If the target address is between the start address and the end address of one data block, the determined target data block is one, and if the target address is between the start address and the end address of a plurality of data blocks, the determined target data block is a plurality.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the executing, based on the number of the target data block, the read-write operation on the target data specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
Specifically, fig. 2 is a schematic diagram of a data read/write logic flow of an automatic train control system according to an embodiment of the present invention, and as shown in fig. 2, when a read operation is performed on target data, a target data block is read from a second sub-area of a first area (area a in fig. 2) of a ferroelectric memory based on a number of the target data block, and a check code corresponding to the target data block is read from a third sub-area of the first area of the ferroelectric memory.
The CRC check is performed on the read data block.
And if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the executing, based on the number of the target data block, the read-write operation on the target data specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is different from the currently read check code, discarding the currently read target data and the currently read check code;
reading the target data block from the second subarea of the second area of the ferroelectric memory based on the number of the target data block again, and reading a check code corresponding to the target data block from the third subarea of the second area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
Specifically, as shown in fig. 2, when a read operation is performed on target data, the target data block is read from the second sub-area of the first area (area a in fig. 2) of the ferroelectric memory based on the number of the target data block, and a check code corresponding to the target data block is read from the third sub-area of the first area of the ferroelectric memory.
The CRC check is performed on the read data block.
And if the check code calculated according to the currently read target data block is different from the currently read check code, discarding the currently read target data and the currently read check code, and returning a fault reason code by fault processing.
Then, the target data block is read from the second sub-area of the second area (area B in fig. 2) of the ferroelectric memory again based on the number of the target data block, and the check code corresponding to the target data block is read from the third sub-area of the second area of the ferroelectric memory.
The CRC check is again performed on the read data block.
And if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
In this case, there is a possibility that an error occurs in the data block in the first area, and therefore, the target data block in the second area is backed up into the second area to secure the possibility of data.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the executing, based on the number of the target data block, the read-write operation on the target data specifically includes:
when the write operation is executed to the target data, the following steps are executed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block;
writing the target data to the ferroelectric memory based on the new data block.
Specifically, as shown in fig. 2, when a write operation is performed on target data, the target data block is read from the second sub-area of the first area (area a in fig. 2) of the ferroelectric memory based on the number of the target data block, and a check code corresponding to the target data block is read from the third sub-area of the first area of the ferroelectric memory.
The CRC check is performed on the read data block.
And if the check code calculated according to the currently read target data block is different from the currently read check code, the check fails, and the fault reason code is returned by fault processing. At this time, the target data block in the first area may have an error, acquire the B area use identifier, and perform the write operation again.
And if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block, and writing the target data into the ferroelectric memory based on the new data block.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the writing the target data into the ferroelectric memory based on the new data block specifically includes:
storing new data blocks into a second sub-area of the first area and a second sub-area of the second area of the ferroelectric memory, respectively;
calculating a new check code according to the new data block;
and replacing the check codes corresponding to the target data block stored in the third subarea of the first area and the third subarea of the second area of the ferroelectric memory by using the new check codes, and returning a writing success mark.
Specifically, when a write operation is performed on the target data, the target data block is read from the second sub-area of the first area of the ferroelectric memory based on the number of the target data block, and the check code corresponding to the target data block is read from the third sub-area of the first area of the ferroelectric memory.
The CRC check is performed on the read data block.
And if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block.
The new data blocks are stored in the second sub-area of the first area and the second sub-area of the second area of the ferroelectric memory, respectively.
And calculating a new check code according to the new data block, replacing the check codes which are stored in the third subarea of the first area and the third subarea of the second area of the ferroelectric memory and correspond to the target data block by using the new check code, and returning a writing success mark.
It should be noted that: in this embodiment, the new data block is stored first, and then the new check code is stored, but the actual application is not limited thereto, and the new check code may be stored first, and then the new data block is stored, or both of them may be performed simultaneously.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, further, the writing the target data into the ferroelectric memory based on the new data block specifically includes:
calculating a new check code according to the new data block;
storing a new data block into a second sub-area of the first area of the ferroelectric memory, and replacing the check code corresponding to the target data block stored in a third sub-area of the first area of the ferroelectric memory with a new check code;
reading the new data block from the second sub-area of the first area of the ferroelectric memory and the new check code from the third sub-area of the first area of the ferroelectric memory;
and if the check code calculated according to the new data block read currently is the same as the new check code read currently, storing the new data block into a second subarea of the second area of the ferroelectric memory, replacing the check code corresponding to the target data block stored in a third subarea of the second area of the ferroelectric memory with the new check code, and returning a writing success mark.
Specifically, as shown in fig. 2, when a write operation is performed on target data, the target data block is read from the second sub-area of the first area (area a in fig. 2) of the ferroelectric memory based on the number of the target data block, and a check code corresponding to the target data block is read from the third sub-area of the first area of the ferroelectric memory.
The CRC check is performed on the read data block.
And if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block.
In order to guarantee the reliability of writing the target data into the ferroelectric memory on the basis of the new data block, it is necessary to verify again:
first, a new check code is calculated from the new data block.
And then, storing the new data block into the second subarea of the first area of the ferroelectric memory, and replacing the check code corresponding to the target data block stored in the third subarea of the first area of the ferroelectric memory by using the new check code.
And reading the new data block which is just written from the second subarea of the first area of the ferroelectric memory, reading the new check code from the third subarea of the first area of the ferroelectric memory, checking the data, and if the check fails, processing the data by a fault and returning a fault reason code.
And if the check code calculated according to the currently read new data block is the same as the currently read new check code, updating the index of the index identification area, reading the index back, checking the index, and if the check fails, processing the fault and returning a fault reason code.
And if the index verification is successful, storing the new data block into the second sub-area of the second area of the ferroelectric memory, replacing the verification code corresponding to the target data block stored in the third sub-area of the second area of the ferroelectric memory by using the new verification code, and returning a writing success mark.
According to the data reading and writing method of the automatic train control system, provided by the embodiment of the invention, the data in the ferroelectric memory is verified and protected in a partition and block verification mode, so that the functions of redundancy backup and automatic repair of the data are realized under the condition of optimizing, fast and reliably reading and writing the data, and the performance and the availability of the system are improved.
Based on any of the above embodiments, when the program of the train automatic control system is started, all data in the ferroelectric memory may also be checked, fig. 3 is a schematic diagram of a data checking logic flow of the train automatic control system according to an embodiment of the present invention, as shown in fig. 3, the program first reads all data of the first area (area a) and the second area (area B) in the ferroelectric memory to a memory, and then checks the data sequentially in units of data of a preset size, for example, 256Byte, for example, by calculating a CRC check code and comparing the check code with a corresponding value of the CRC check area, if the areas A, B are all checked correctly, then checks the CRC data of the A, B area, if all the same, the data of the area a-device parameter area is used to assign values to program variables, and if different values exist, the system is down protected and fault recording is performed; if only the verification of the area A is correct, assigning values to the program variables by using the data of the area A and the equipment parameter area, and copying all the data of the area A to the area B; if only the B area is verified correctly, assigning values to the program variables by using the data of the B area and the equipment parameter area, and copying all the data of the B area to the A area; and if the AB areas are checked to be wrong, performing downtime protection and performing fault recording.
The method provided by the embodiment of the invention has the following advantages:
the vehicle-mounted ATC equipment adopts the ferroelectric memory to replace the EEPROM to record key operation parameters and data, and can effectively shorten the system initialization time.
Data and key operation logs sent to the ferroelectric at the moment of ATC power failure can still be stably recorded.
The data is checked in a blocking mode, and only the data of the data block (256 bytes/block) where the data is located needs to be updated, read back and checked when new data is written.
The data is stored in a mirror image redundancy mode in the AB area, and the AB area data respectively has a self-checking function and a bad area self-recovery function, so that the safety and the usability of the data are greatly improved.
By utilizing the high-speed read-write characteristic of the ferroelectric memory, the key operation Log of the ATC system is quickly recorded, the problem that the key operation Log is lost at the moment of power failure and downtime is effectively avoided, and the problem analysis and the troubleshooting after the fact are convenient.
The following is described with reference to three specific scenarios:
firstly, data of a certain bit in the area A of the ferroelectric memory has errors.
In the process of starting self-checking of an ATC system, if the CRC of a certain data block in the area A fails and the CRC of the data block in the area B is all correct, the correct data in the area B is used for covering the error data in the area A, and the operation parameter data stored in the area B is returned to an ATC call function, so that the ATC is started normally to operate, and the self-repairing of the error data in the area A is completed.
And secondly, writing data errors into the ferroelectrics in the ATC operation process, and restarting the operation after downtime protection.
And (4) making an error when data is written into the ferroelectric in the ATC operation process, and performing downtime protection. After the manual restart, when the data in the ferroelectric AB area is verified, one area is verified to be completely correct, and the other area is verified to be wrong, the ATC is operated by using the data in the area with the completely correct verification, and the self-repairing is automatically carried out on the other area.
And secondly, the hardware is in a fatal failure to cause downtime, and the related Log is not in time to be sent to a record board for recording.
The writing speed of the ferroelectric memory is comparable to that of a RAM memory, and the ferroelectric memory can be saved by power failure. At the moment of failure, the time of the onboard capacitor and the voltage drop of the power supply is enough to completely record the failure Log, so that great convenience is brought to the failure analysis after the failure.
Based on any of the above embodiments, fig. 4 is a schematic diagram of a data read-write device of an automatic train control system according to an embodiment of the present invention, and as shown in fig. 4, an embodiment of the present invention provides a data read-write device of an automatic train control system, including a receiving module 401, a determining module 402, and a read-write module 403, where:
the receiving module 401 is configured to receive read-write instruction information for target data, where the read-write instruction information includes a target address in the ferroelectric memory corresponding to the target data; the determining module 402 is configured to determine, according to the target address, a number of a target data block in the ferroelectric memory corresponding to the target address; the read-write module 403 is configured to execute a read-write operation on the target data based on the number of the target data block; the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
The data read-write device of the automatic train control system provided by the embodiment of the invention adopts a partition and block check mode to check and protect the data in the ferroelectric memory, realizes the functions of redundancy backup and automatic repair of the data under the condition of optimizing, quickly and reliably reading and writing the data, and improves the performance and the availability of the system.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device includes: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a communication bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the communication bus 504. The processor 501 and the memory 502 communicate with each other via a bus 503. The processor 501 may call logic instructions in the memory 503 to perform the following method:
receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data;
determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address;
executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
In addition, the logic instructions in the memory may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Further, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the steps of the above-described method embodiments, for example, including:
receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data;
determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address;
executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
Further, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above method embodiments, for example, including:
receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data;
determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address;
executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A data read-write method of an automatic train control system is characterized by comprising the following steps:
receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in a ferroelectric memory corresponding to the target data;
determining the number of a target data block corresponding to the target address in the ferroelectric memory according to the target address;
executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
2. The method for reading and writing data of an automatic train control system according to claim 1, wherein the determining the number of the target data block corresponding to the target address in the ferroelectric memory according to the target address specifically comprises:
searching index identification in a first subarea of a first area of the ferroelectric memory, and determining the number of the target data block;
wherein the index identifier comprises a start address, an end address and a number of each data block in the second sub-area, and the target address is between the start address and the end address of the target data block.
3. The method for reading and writing data of an automatic train control system according to claim 1, wherein the performing of the reading and writing operation on the target data based on the number of the target data block specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
4. The method for reading and writing data of an automatic train control system according to claim 1, wherein the performing of the reading and writing operation on the target data based on the number of the target data block specifically includes:
when a read operation is performed on the target data, the following steps are performed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is different from the currently read check code, discarding the currently read target data and the currently read check code;
reading the target data block from the second subarea of the second area of the ferroelectric memory based on the number of the target data block again, and reading a check code corresponding to the target data block from the third subarea of the second area of the ferroelectric memory;
and if the check code calculated according to the currently read target data block is the same as the currently read check code, extracting the target data from the currently read target data block, and returning a reading success mark.
5. The method for reading and writing data of an automatic train control system according to claim 1, wherein the performing of the reading and writing operation on the target data based on the number of the target data block specifically includes:
when the write operation is executed to the target data, the following steps are executed:
reading the target data block from a second subarea of the first area of the ferroelectric memory based on the number of the target data block, and reading a check code corresponding to the target data block from a third subarea of the first area of the ferroelectric memory;
if the check code calculated according to the currently read target data block is the same as the currently read check code, writing the target data into the position of the target address in the target data block to obtain a new data block;
writing the target data to the ferroelectric memory based on the new data block.
6. The method for reading and writing data of an automatic train control system according to claim 5, wherein writing the target data into the ferroelectric memory based on the new data block specifically comprises:
storing new data blocks into a second sub-area of the first area and a second sub-area of the second area of the ferroelectric memory, respectively;
calculating a new check code according to the new data block;
and replacing the check codes corresponding to the target data block stored in the third subarea of the first area and the third subarea of the second area of the ferroelectric memory by using the new check codes, and returning a writing success mark.
7. The method for reading and writing data of an automatic train control system according to claim 5, wherein writing the target data into the ferroelectric memory based on the new data block specifically comprises:
calculating a new check code according to the new data block;
storing a new data block into a second sub-area of the first area of the ferroelectric memory, and replacing the check code corresponding to the target data block stored in a third sub-area of the first area of the ferroelectric memory with a new check code;
reading the new data block from the second sub-area of the first area of the ferroelectric memory and the new check code from the third sub-area of the first area of the ferroelectric memory;
and if the check code calculated according to the new data block read currently is the same as the new check code read currently, storing the new data block into a second subarea of the second area of the ferroelectric memory, replacing the check code corresponding to the target data block stored in a third subarea of the second area of the ferroelectric memory with the new check code, and returning a writing success mark.
8. A data read-write device of an automatic train control system is characterized by comprising:
the receiving module is used for receiving read-write instruction information aiming at target data, wherein the read-write instruction information comprises a target address in the ferroelectric memory corresponding to the target data;
a determining module, configured to determine, according to the target address, a number of a target data block in the ferroelectric memory, where the target data block corresponds to the target address;
the read-write module is used for executing read-write operation aiming at the target data based on the number of the target data block;
the ferroelectric memory is divided into two large areas, namely a first area and a second area, each large area is at least divided into three sub-areas, namely a first sub-area, a second sub-area and a third sub-area, data stored in each sub-area in the first area and data stored in the corresponding sub-area in the second area are completely the same, so that the first area and the second area are mutually backed up, the first sub-area is used for storing an index identifier, the second sub-area is used for storing a data block with a preset size, and the third sub-area is used for storing a check code corresponding to the index identifier and a check code corresponding to the data block.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and operable on the processor, wherein the processor executes the computer program to implement the steps of the method for reading and writing data of the automatic train control system according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method for reading and writing data of an automatic train control system according to any one of claims 1 to 7.
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