CN111444034A - Method for preventing initialization failure of Dflash of instrument - Google Patents
Method for preventing initialization failure of Dflash of instrument Download PDFInfo
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- CN111444034A CN111444034A CN202010215616.6A CN202010215616A CN111444034A CN 111444034 A CN111444034 A CN 111444034A CN 202010215616 A CN202010215616 A CN 202010215616A CN 111444034 A CN111444034 A CN 111444034A
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- dflash
- initialization
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- failure
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000009191 jumping Effects 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0751—Error or fault detection not based on redundancy
- G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
- G06F11/076—Error or fault detection not based on redundancy by exceeding limits by exceeding a count or rate limit, e.g. word- or bit count limit
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0793—Remedial or corrective actions
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0238—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory
- G06F12/0246—Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory in block erasable memory, e.g. flash memory
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Instrument Panels (AREA)
Abstract
The invention discloses a method for preventing Dflash initialization failure of an instrument, which is characterized by comprising the following steps: the method for preventing the initialization failure of the Dflash of the instrument comprises the following steps: firstly, initializing Dflash; secondly, judging whether the Dflash mode flag bit is initialized successfully or not, if YES, entering a third step, and if NO, entering a fourth step; reading Dflash data and comparing whether preset flag bytes are consistent or not, if YES, entering a sixth step, and if NO, entering a fifth step; step four, judging whether the initialization is carried out for the Nth time or not, if NO, entering the step one, and if YES, entering the step three; fifthly, writing default data in the ROM into the RAM and writing Dflash once; after the fifth step is finished, entering a sixth step; and sixthly, jumping to work normally. The method for preventing the Dflash initialization failure of the instrument can obviously increase the fault tolerance of software and effectively prevent the instrument from displaying and indicating errors caused by the Dflash initialization failure.
Description
Technical Field
The invention relates to the technical field of automobile electronics, in particular to a method for preventing initialization failure of a Dflash of an instrument.
Background
Data Flash (Data memory, abbreviated as Dflash) is a memory chip used for storing important Data of a whole vehicle instrument in the instrument, and the stored Data comprises: ODO data, header data, configuration information, and some data that is required to be not lost upon power loss.
When the automobile instrument is powered on Battery, the initialization process including Dflash initialization, MCU clock initialization, port initialization, RTC clock initialization, timed interrupt initialization, ADC initialization, motor module initialization, L CD module initialization, CAN module initialization and the like exists in the instrument.
Generally speaking, the instrument initialization is to restore the data state and configuration information of the instrument before the whole vehicle is powered off. In the process of reading and writing the data memory, occasionally, data cannot be read or written, so that the Dflash initialization fails, and data before last power-off cannot be recovered, thereby causing data loss or confusion. Once the initialization of the Dflash fails, the RAM cannot read the data and configuration stored in the Dflash, and at this time, the Dflash can directly restore the default data and configuration information in the ROM, and the data state and configuration information after the initialization of the meter directly become the default information stored in the ROM, thereby causing the loss of the stored data and the error of the functional configuration. And then display the wrong information to the customer, resulting in a poor driving experience.
Disclosure of Invention
The invention aims to: the method for preventing the Dflash initialization failure of the instrument overcomes the defects in the prior art, solves the problems in the prior art, and provides the method for preventing the Dflash initialization failure of the instrument, so that the wrong display and indication caused by the Dflash initialization failure of the instrument are prevented from bringing bad impression to customers.
The technical scheme of the invention is as follows:
a method for preventing initialization failure of a Dflash of a meter is characterized by comprising the following steps: the method for preventing the initialization failure of the Dflash of the instrument comprises the following steps:
firstly, initializing Dflash;
secondly, judging whether the Dflash mode flag bit is initialized successfully or not, if YES, entering a third step, and if NO, entering a fourth step;
reading Dflash data and comparing whether preset flag bytes are consistent or not, if YES, entering a sixth step, and if NO, entering a fifth step;
step four, judging whether the initialization is carried out for the Nth time or not, if NO, entering the step one, and if YES, entering the step three;
fifthly, writing default data in the ROM into the RAM and writing Dflash once, and entering a sixth step after the fifth step is finished;
and sixthly, jumping to work normally.
As a further improvement of this solution, in N times in the fourth step, N is a natural number greater than or equal to 2.
As a further improvement of this solution, in N times in the fourth step, N is 3.
The method is further improved by judging whether the Dflash initialization frequency reaches 3 times, if not, the Dflash initialization is carried out again until the Dflash initialization is successful, the probability of failure of the Dflash initialization is very small, and if the 3 Dflash initialization fails, the internal block area of the instrument is damaged or the hardware has quality problems.
The invention has the advantages that:
1. the method for preventing the initialization failure of the Dflash of the instrument disclosed by the invention has the advantages that a logic judgment is added in the process after the initialization failure of the Dflash occurs, if the initialization failure of the Dflash occurs, the initialization step of the Dflash is returned to the initialization step of the Dflash, and the initialization step of the Dflash is carried out again, so that the fault tolerance of software can be obviously improved, and the condition of the initialization failure of the Dflash can be effectively prevented.
2. Therefore, the fault tolerance rate can be greatly increased, and the phenomenon that due to accidental factors, one Dflash initialization failure occurs, the default data in the whole instrument data recovery ROM is caused, and error display and indication occur. The error display and indication caused by the failure of Dflash initialization of the prevention meter bring bad impression to customers.
Drawings
The invention is further described with reference to the following figures and examples:
fig. 1 is a schematic diagram of a software flow for preventing Dflash initialization failure in the prior art.
FIG. 2 is a schematic diagram of the software flow for preventing Dflash initialization failure according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
As shown in fig. 2, the present invention discloses a method for preventing initialization failure of a meter Dflash, which comprises the following steps: firstly, initializing Dflash; secondly, judging whether the Dflash mode flag bit is initialized successfully or not, if YES, entering a third step, and if NO, entering a fourth step;
reading Dflash data and comparing whether preset flag bytes are consistent or not, if YES, entering a sixth step, and if NO, entering a fifth step; step four, judging whether the initialization is carried out for the Nth time or not, if NO, entering the step one, and if YES, entering the step three; fifthly, writing default data in the ROM into the RAM and writing Dflash once; after the fifth step is finished, entering a sixth step; and sixthly, jumping to work normally. The method for preventing the initialization failure of the Dflash of the instrument disclosed by the invention has the advantages that a logic judgment is added in the process after the initialization failure of the Dflash occurs, if the initialization failure of the Dflash occurs, the initialization step of the Dflash is returned to the initialization step of the Dflash, and the initialization step of the Dflash is carried out again, so that the fault tolerance of software can be obviously improved, and the condition of the initialization failure of the Dflash can be effectively prevented.
As a further improvement of this solution, in N times in the fourth step, N is a natural number greater than or equal to 2. Therefore, the fault tolerance rate can be greatly increased, and the phenomenon that due to accidental factors, one Dflash initialization failure occurs, the default data in the whole instrument data recovery ROM is caused, and error display and indication occur. The error display and indication caused by the failure of Dflash initialization of the prevention meter bring bad impression to customers.
As a further improvement of this solution, in N times in the fourth step, N is 3. And if the initialization is successful, the flag bit value is judged to be valid, and if the returned flag bit is not initialized successfully, the reinitialization judgment step is continuously executed. Because the Dflash initialization failure belongs to the sporadic phenomenon with extremely low probability, if the Dflash initialization failure exceeds 3 times, the hardware can be determined to generate faults/damages, so the Dflash initialization is repeatedly initialized twice (till initialization is carried out for three times) after the Dflash initialization failure, and the fault tolerance is increased. When N is 3, the method is most economical and effective, can prevent error display and indication caused by Dflash initialization failure of the instrument, and can reduce the running time.
The method is further improved by judging whether the Dflash initialization frequency reaches 3 times, if not, the Dflash initialization is carried out again until the Dflash initialization is successful, the probability of failure of the Dflash initialization is very small, and if the 3 Dflash initialization fails, the internal block area of the instrument is damaged or the hardware has quality problems. Therefore, the fault tolerance rate can be greatly increased, and the phenomenon that due to accidental factors, one Dflash initialization failure occurs, the default data in the whole instrument data recovery ROM is caused, and error display and indication occur. The error display and indication caused by the failure of Dflash initialization of the prevention meter bring bad impression to customers.
As shown in fig. 1, a software flow diagram for preventing the Dflash initialization failure is not added in the prior art. Initializing Dflash, judging whether the initialization of the Dflash mode flag bit is successful, if YES, entering the second step, and if NO, entering the third step; reading Dflash data and comparing whether preset flag bytes are consistent or not, if YES, entering a fourth step, and if NO, entering a third step; writing default data in the ROM into the RAM and writing the Dflash once; and fourthly, skipping to work normally. Therefore, if the Dflash initialization fails, the default data in the ROM is directly written into the RAM and the Dflash is written once, so that error display and indication caused by the Dflash initialization failure can occur, and bad impression is easily brought to a client. The method for preventing the initialization failure of the Dflash of the instrument disclosed by the invention adds a logic judgment in the process after the initialization failure of the Dflash occurs, and returns to the step of the initialization of the Dflash to perform the initialization step of the Dflash again if the initialization failure of the Dflash occurs.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention. The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.
Claims (4)
1. A method for preventing initialization failure of a Dflash of a meter is characterized by comprising the following steps: the method for preventing the initialization failure of the Dflash of the instrument comprises the following steps:
the first step, the initialization of the Dflash,
secondly, judging whether the Dflash mode flag bit is initialized successfully or not, if YES, entering a third step, and if NO, entering a fourth step;
reading Dflash data and comparing whether preset flag bytes are consistent or not, if YES, entering a sixth step, and if NO, entering a fifth step;
step four, judging whether the initialization is carried out for the Nth time or not, if NO, entering the step one, and if YES, entering the step three;
fifthly, writing default data in the ROM into the RAM and writing Dflash once; after the fifth step is finished, entering a sixth step;
and sixthly, jumping to work normally.
2. The method of claim 1 for preventing a Dflash initialization failure of a meter, comprising: in the fourth step, N is a natural number more than or equal to 2 in the N times.
3. The method of claim 1 for preventing a Dflash initialization failure of a meter, comprising: in the N times in the fourth step, N is 3.
4. The method of claim 1 for preventing a Dflash initialization failure of a meter, comprising: and judging whether the Dflash initialization frequency reaches 3 times, if not, performing the Dflash initialization again until the Dflash initialization succeeds, wherein the Dflash initialization has low failure probability, and if the 3 Dflash initialization fails, the internal block area of the instrument is damaged or the hardware has quality problems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215616.6A CN111444034A (en) | 2020-03-25 | 2020-03-25 | Method for preventing initialization failure of Dflash of instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010215616.6A CN111444034A (en) | 2020-03-25 | 2020-03-25 | Method for preventing initialization failure of Dflash of instrument |
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| CN111444034A true CN111444034A (en) | 2020-07-24 |
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| CN202010215616.6A Pending CN111444034A (en) | 2020-03-25 | 2020-03-25 | Method for preventing initialization failure of Dflash of instrument |
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Citations (7)
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|---|---|---|---|---|
| JP2008309069A (en) * | 2007-06-14 | 2008-12-25 | Fujitsu Ten Ltd | Electronic control device for vehicle, electronic control system for vehicle and starting method of electronic control device for vehicle |
| US20090112941A1 (en) * | 2007-10-31 | 2009-04-30 | Asustek Computer Inc. | Computer system and firmware recovery method for computer system |
| US20100242570A1 (en) * | 2009-03-25 | 2010-09-30 | Denso Corporation | Method for initializing indicating instrument for vehicle |
| CN108073474A (en) * | 2016-11-18 | 2018-05-25 | 大陆汽车电子(芜湖)有限公司 | Suitable for the data processing method of automobile instrument |
| US20180293121A1 (en) * | 2016-06-14 | 2018-10-11 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method, apparatus and system for processing data |
| CN109241800A (en) * | 2018-09-17 | 2019-01-18 | 苏州浪潮智能软件有限公司 | A kind of self-aided terminal and its operation method |
| US20190188084A1 (en) * | 2016-09-13 | 2019-06-20 | Psa Automobiles Sa | Device for controlling the reinitialization of a computer on board an automobile |
-
2020
- 2020-03-25 CN CN202010215616.6A patent/CN111444034A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008309069A (en) * | 2007-06-14 | 2008-12-25 | Fujitsu Ten Ltd | Electronic control device for vehicle, electronic control system for vehicle and starting method of electronic control device for vehicle |
| US20090112941A1 (en) * | 2007-10-31 | 2009-04-30 | Asustek Computer Inc. | Computer system and firmware recovery method for computer system |
| US20100242570A1 (en) * | 2009-03-25 | 2010-09-30 | Denso Corporation | Method for initializing indicating instrument for vehicle |
| US20180293121A1 (en) * | 2016-06-14 | 2018-10-11 | Hangzhou Hikvision Digital Technology Co., Ltd. | Method, apparatus and system for processing data |
| US20190188084A1 (en) * | 2016-09-13 | 2019-06-20 | Psa Automobiles Sa | Device for controlling the reinitialization of a computer on board an automobile |
| CN108073474A (en) * | 2016-11-18 | 2018-05-25 | 大陆汽车电子(芜湖)有限公司 | Suitable for the data processing method of automobile instrument |
| CN109241800A (en) * | 2018-09-17 | 2019-01-18 | 苏州浪潮智能软件有限公司 | A kind of self-aided terminal and its operation method |
Non-Patent Citations (1)
| Title |
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| 丁爱峰等: "某车型仪表Dflash数据篡改故障分析" * |
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