JP2013003966A - Data writing device and data writing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent processing capacity and processing speed of writing processing for data having different priorities from decreasing and write data having high priority to a non-volatile memory more quickly.SOLUTION: A writing data priority determination unit 6 determines priority that is added to data, and outputs data having high priority to a first queue 2a corresponding to the high priority and also outputs data having low priority to a second queue 2b corresponding to the low priority. Then, a writing data selection processing unit 11 sequentially selects all data having high priority that is firstly registered in the first queue 2a to write the data in an EEPROM 3. Also, when no data exists in the first queue 2a, the writing data selection processing unit 11 sequentially selects all data having low priority that is registered in the second queue 2b to write the data in the EEPROM 3.

Description

  TECHNICAL FIELD The present invention relates to a technical field of a data writing device and a data writing method for writing various data having different priorities, such as information on a vehicle, etc., into a nonvolatile memory used for an electronic control device mounted on the vehicle, for example. It is about.

  Conventionally, many electronic control units (ECUs) are used for various controls such as vehicle engine control, transmission control, clutch control, and change lever control. As this ECU, an ECU using a non-volatile memory (EEPROM) is known (for example, see Patent Document 1). The EEPROM used in the ECU described in Patent Document 1 stores information data such as a learned value acquired during control and a failure code (diag code) for determining a system failure. .

  On the other hand, in order to store various data in the EEPROM, many data writing devices for writing the data in the EEPROM have been proposed. As this data writing device, importance is given to a plurality of data, and the data is listed in the order of importance in advance, and when writing each data to the EEPROM, the order of listing (that is, the order of importance) The method of writing to the EEPROM and assigning the importance to a plurality of data are listed, and when writing each data to the EEPROM, the data is rearranged in order of importance and rearranged in order (that is, the importance A method of writing data to the EEPROM in descending order has been proposed (see, for example, Patent Document 2).

FIGS. 5A and 5B are diagrams for explaining the data writing method described in Patent Document 2, respectively.
In the data writing method shown in FIG. 5 (a), a plurality of data write requests 101, 102, and 103 each having a degree of importance are listed, and at the same time listed (that is, write requests 101, 102, and 103). In this order, each data is written to the EEPROM.

  In addition, the data writing method shown in FIG. 5B has a plurality of data write requests 201, 202, 202 each having a different importance 1, 3, 4 (importance 1 <importance 3 <importance 4). 203 is listed, and when writing each data to the EEPROM, the write requests 201, 202, and 203 are switched in the order of importance (that is, the order of the write request 203, the write request 201, and the write request 202). In this method, the data is written in the EEPROM in the order described.

Japanese Patent No. 4281222. Japanese Patent Application Laid-Open No. 2008-122793.

  However, when the data writing order is controlled as described above, new control is required due to the difference in importance, and the data writing process becomes complicated. As a result, there is a possibility that the processing capability of the data writing process and the processing speed may be reduced.

  The present invention has been made in view of such circumstances, and the purpose of the present invention is to prevent higher-priority data while preventing a decrease in processing performance and a decrease in processing speed of data writing processing with different priorities. To provide a data writing device and a data writing method capable of quickly writing to a nonvolatile memory.

  In order to solve the above-described problem, the data writing device according to the present invention corresponds to the priority given to the data, to which one of the priorities classified into a plurality of different ones is given. The same number of queues as the plurality of priorities provided to be registered, and the writing to determine the priority given to the data and output the data to the queue corresponding to the determined priority A data priority determination unit, and among the plurality of queues, the data is registered in the order of data registered in a queue in which low priority data is registered from data registered in a queue in which high priority data is registered. And a write data selection processor that writes the selected data to the nonvolatile memory in the order of selection.

  In the data writing device according to the present invention, the plurality of queues are lower than a first queue in which data with high priority is registered and a priority of data registered in the first queue. The write data priority determination unit outputs data with a high priority to the first queue and has a low priority. The given data is output to the second queue, and when the write data selection processing unit has at least data registered in the first queue, all of the data registered in the first queue first Is selected and written to the nonvolatile memory, and when there is no data registered in the first queue, the data registered in the second queue is selected and the data is It is characterized in that writing to the volatile memory.

  On the other hand, the data writing method according to the present invention uses the same number of queues as a plurality of different priorities assigned to data, determines the priority of the data to which the priority is assigned, and determines the priority for which the data is determined. In the order corresponding to the data registered in the queue in which the low priority data is registered from the data registered in the queue in which the high priority data is registered among the plurality of queues. The data is selected and written to a nonvolatile memory.

  According to the data writing apparatus and the data writing method of this example according to the present invention configured as described above, the same number of queues as the priorities classified into a plurality of different ones are used. In that case, among the plurality of queues, data to which any one of the plurality of priorities is assigned is registered in a queue corresponding to the priority assigned to the data. Then, the write data priority determination unit determines the priority of the data to which the priority is given and outputs this data to the queue corresponding to the determined priority. Further, the write data selection processing unit selects the data from the plurality of queues in the order of the data registered in the queue in which the high priority data is registered to the data registered in the queue in which the low priority data is registered. At the same time, the selected data is written to the nonvolatile memory in the selected order.

Therefore, when data with high priority is input after data with low priority is first registered in one queue as in the conventional case, the priority with which data with high priority is registered first is input. It is possible to eliminate the need to control the data writing order according to the priority by moving the data before the lower data (the data extracting side). This eliminates the need for new control and simplifies the data writing process. As a result, it is possible to effectively improve the processing capability and the processing speed of the data writing process. Thus, high priority data can be written to the nonvolatile memory more quickly.

It is a block diagram showing typically an example of an embodiment of a data writing device concerning the present invention. It is a block diagram which shows typically the control part of the data writing apparatus shown in FIG. It is a figure which shows the flow for performing the registration process to the queue of the data written in EEPROM. It is a figure which shows the flow for performing the selection process of the data written in EEPROM. (A) is a diagram schematically showing a conventional data writing device, and (b) is a diagram for explaining the operation of the conventional data writing device shown in (a).

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram schematically showing an example of an embodiment of a data writing apparatus according to the present invention, and FIG. 2 is a block diagram schematically showing a control unit of the data writing apparatus shown in FIG. The same components as those of the data writing apparatus shown in FIGS. 5A and 5B described above are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 1 and FIG. 2, the data writing apparatus 1 of this example includes two first and second queues (QUEUE) 2a and 2b, which are write matrices, and a non-volatile memory (EEPRO).
M) 3, and a control unit (electronic control unit; ECU) 5 that controls writing of data 4 given priority to the EEPROM 3. In the data writing apparatus 1 of this example, the priority given to data is classified into two, high and low. The two first and second queues 2a and 2b are arranged in the same number as the number of the two classified priorities. In addition, when the number of classified priorities is classified into a plurality of three or more, the same number of queues as the number of classified priorities is provided. In this example, the priority is classified into two as described above, and the queue is provided with two first and second queues 2a and 2b.

  Each of the first and second queues 2a, 2b has n data portions (1), (2), (3), (4), (5),..., (N). Of the first and second queues 2a and 2b, one of the first queues 2a is a queue provided corresponding to data to which high priority is given, and the other second queue 2b is This is a queue provided corresponding to data to which a low priority is given. That is, data with high priority is registered in the first queue 2a, and data with high priority is registered in the first queue 2a. Therefore, in the data writing device 1 of this example, the data 4 is classified into one of high priority data and low priority data. As an example, the priority of the data 4 is given to the data 4 determined to be higher than the reference value based on a predetermined reference value of the priority. Low priority is assigned to data 4 determined to be lower than this reference value.

  The ECU 5 includes a write data priority determination unit 6, a first registration pointer 7, a second registration pointer 8, a first extraction pointer 9, a second extraction pointer 10, and a write data selection processing unit 11.

The write data priority determination unit 6 determines whether the priority of the input data 4 is high or low when the data 4 to which the priority is given is input to the data writing device 1. When the write data priority determination unit 6 determines that the input data is data with high priority, the write data priority determination unit 6 outputs the data 4 to the first queue 2a, and the input data has priority. If it is determined that the data is low, the data 4 is output to the second queue 2b.

  The first registration pointer 7 stores the high-priority data 4 output from the write data priority determination unit 6 in the data portions (1), (2), (3), (4), (5),..., (N) are sequentially moved and input, respectively, and high priority data (a1), high priority data (b1), high priority data ( c1),... are registered in the first queue 2a (FIG. 1 shows a state where data up to high priority data (d1) is registered).

In addition, the second registration pointer 8 indicates that the low priority data 4 output from the write data priority determination unit 6 and the data parts (2), (3) of the second queue 2b in the order of the data output previously. ), (4), (5),..., (N) are sequentially moved and input, and data (a2) having low priority,
Registered in the second queue 2b as low priority data (b2), low priority data (c2),... (FIG. 1 shows a state where data up to low priority data (d2) is registered. Have been).

The first fetch pointer 9 is used for each data part (1), (2), (3), (
4), (5),..., (N) to move to each data part (1), (2), (3), (4), (5),.
The high priority data (a1), high priority data (b1), high priority data (c1),... Registered in (n) are extracted and output to the write data selection processing unit 11. The second fetch pointer 10 is used for each data part (1), (2), (3), (4) of the second queue 2b.
), (5),..., (N) to move to each data part (1), (2), (3), (4), (5),.
The low priority data (a1), low priority data (b1), low priority data (c1),... registered in n) are extracted and output to the write data selection processing unit 11.

The write data selection processing unit 11 first determines whether data 4 is registered in the first queue 2a having a high priority. When the write data selection processing unit 11 determines that the data 4 is registered in the first queue 2a, the high priority data (a1) and the high priority data are obtained from each data unit of the first queue 2a. Data (b1), high priority data (c1),..., First-in first-out (FIFO; First In First Out)
), And the high-priority data 4 is written in the EEPROM 3 in order. If the write data selection processing unit 11 determines that the data 4 is not registered in the first queue 2a, the write data selection processing unit 11 determines whether the data 4 is registered in the second queue 2b having a low priority. When the write data selection processing unit 11 determines that the data 4 is registered in the second queue 2b, the low-priority data (a2) and the low-priority data are received from each data unit of the second queue 2b. Similarly, the data (b2), the low priority data (c2),... Are sequentially extracted by the FIFO, and the extracted low priority data 4 are sequentially written in the EEPROM 3.

  Next, a data writing method by the data writing apparatus 1 of this example will be described. In this data writing method, processing for registering data to be written to the EEPROM into a queue and processing for selecting data to be written to the EEPROM are performed. FIG. 3 is a diagram illustrating a flow for performing registration processing of data to be written to the EEPROM in a queue, and FIG. 4 is a diagram illustrating a flow for performing processing for selecting data to be written to the EEPROM.

In the data writing method of this example, first, registration processing of queued data to be written to the EEPROM is performed. As shown in FIG. 3, when data 4 to which priority is given is input to the data writing device 1, it is determined whether or not the priority of the data 4 to which priority is given in step S <b> 1 is high. The determination unit 6 determines. If the write data priority determination unit 6 determines that the priority of the data 4 is high, the data 4 is registered in the first queue 2a in step S2. If the write data priority determination unit 6 determines in step S1 that the priority of the data 4 is not high (that is, the priority is low), the data 4 is registered in the second queue 2b in step S3. The Thus, the registration process of the data 4 in the first and second queues 2a and 2b of the data writing device 1 for one data 4 is completed. The data 4 after the next data 4 is processed in the same manner, and the data 4 with high priority is registered in order in each data part of the first queue 2a, and the data 4 with low priority is registered with the second queue. Registered in order in each data part 2b.

  Next, in the data writing method of this example, selection processing of data to be written to the EEPROM is performed. As shown in FIG. 4, in step S11, it is determined whether or not there is data 4 registered in the first queue 2a in which data 4 with high priority is registered. If it is determined that there is data 4 in the first queue 2a, the data 4 in the first queue 2a is selected in step S12, and the high priority data 4 selected in step S13 is written to the EEPROM 3. It is. Thereafter, the process proceeds to step S11 again, and the processes after step S11 are performed.

  If it is determined in step S11 that there is no data 4 in the first queue 2a, it is determined in step S14 whether or not there is data 4 registered in the second queue 2b in which low priority data 4 is registered. Is done. If it is determined that there is data 4 in the second queue 2b, the data 4 in the second queue 2b is selected in step S15, and the low priority data 4 selected in step S16 is written to the EEPROM 3. It is. Thereafter, the process proceeds to step S11 again, and each process after step S11 is performed. If it is determined in step S14 that there is no data 4 in the second queue 2b, the process of selecting data to be written to the EEPROM is completed.

  As described above, in the data writing method of this example, the high priority data 4 is registered in the first queue 2a for registering the high priority data, and the low priority data 4 is the low priority data. Is registered in the second queue 2b. Further, in the data writing method of this example, first, the high priority data 4 of the first queue 2a is selected, taken out in the order of registration, and written to the EEPROM 3. Then, when there is no data 4 registered in the first queue 2a, or when there is no data 4 registered in the first queue 2a, the low-priority data 4 in the second queue 2b is selected for the first time, and They are taken out in the order of registration and written to the EEPROM 3. That is, in the data writing method of this example, all the data 4 with high priority is written to the EEPROM 3 before the data 4 with low priority.

  According to the data writing device 1 and the data writing method of this example, there are two queues, a first queue 2a in which high priority data 4 is registered and a second queue 2b in which low priority data 4 is registered. A queue is used. Therefore, when the data 4 with high priority is input after the data 4 with low priority is first registered in one queue 2 as in the prior art, the data 4 with high priority is registered first. It is possible to move the data prior to the lower priority data 4 (on the data extraction side) without having to control the data writing order according to the priority. This eliminates the need for new control and simplifies the data writing process. As a result, it is possible to effectively improve the processing capability and the processing speed of the data writing process. Thus, high priority data can be written to the EEPROM 3 more quickly.

  In addition, this invention is not limited to the above-mentioned example, A various design change is possible. For example, in the above-described example, the priority is classified into two, high and low, but this priority can be classified into an arbitrary plurality including three, high, medium and low. In that case, the same number of queues as the number of classified priorities are used, and the data is registered in the queue corresponding to the priority assigned to the data. In short, the present invention can be modified in various ways within the scope of the technical matters described in the claims.

  A data writing device and a data writing method according to the present invention include, for example, data for writing various data having different priorities, such as information on a vehicle, in a non-volatile memory used in an electronic control device mounted on the vehicle or the like. The present invention can be suitably used for a writing device and a data writing method.

DESCRIPTION OF SYMBOLS 1 ... Data writing apparatus, 2a ... 1st queue | queue (QUEUE), 2b ... 2nd queue | queue (QUEUE), 3 ... Nonvolatile memory (EEPROM), 4 ... Data, 5 ... Control part (ECU), 6 ... Write Data priority determination unit, 7 ... first registration pointer, 8 ... second registration pointer, 9 ... first extraction pointer, 10 ... second extraction pointer, 11 ... write data selection processing unit

Claims (3)

The same number as the plurality of priorities provided so that data to which any one of the priorities classified into a plurality of different priorities is assigned is registered corresponding to the priority given to the data Queue and
A write data priority determination unit that determines the priority assigned to the data and outputs the priority to the queue corresponding to the priority determined for the data;
Among the plurality of queues, the data is selected in the order of data registered in a queue in which low priority data is registered from data registered in a queue in which high priority data is registered, and the selected data A write data selection processing unit for writing to the non-volatile memory in the order selected.
A data writing apparatus comprising: In the plurality of queues, a first queue in which data having a high priority is registered and data having a priority lower than that of data registered in the first queue are registered. A second queue,
The write data priority determination unit outputs data given a high priority to the first queue and outputs data given a low priority to the second queue,
When there is at least data registered in the first queue, the write data selection processing unit first selects all the data registered in the first queue and writes it to the nonvolatile memory; The data writing apparatus according to claim 1, wherein when there is no data registered in the first queue, the data registered in the second queue is selected and written to the nonvolatile memory. Use the same number of different priority queues assigned to the data,
Determining the priority of the data to which the priority is given, registering the data in the queue corresponding to the determined priority;
Among the plurality of queues, the data is selected in the non-volatile memory by selecting the data in the order of the data registered in the queue in which the low priority data is registered from the data registered in the queue in which the high priority data is registered. A data writing method characterized by writing.

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