CN108073462A - A kind of SD card reads abnormal repositioning method and system - Google Patents
A kind of SD card reads abnormal repositioning method and system Download PDFInfo
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- CN108073462A CN108073462A CN201610998935.2A CN201610998935A CN108073462A CN 108073462 A CN108073462 A CN 108073462A CN 201610998935 A CN201610998935 A CN 201610998935A CN 108073462 A CN108073462 A CN 108073462A
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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
- G06F11/0706—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 the processing taking place on a specific hardware platform or in a specific software environment
- G06F11/0736—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 the processing taking place on a specific hardware platform or in a specific software environment in functional embedded systems, i.e. in a data processing system designed as a combination of hardware and software dedicated to performing a certain function
- G06F11/0739—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 the processing taking place on a specific hardware platform or in a specific software environment in functional embedded systems, i.e. in a data processing system designed as a combination of hardware and software dedicated to performing a certain function in a data processing system embedded in automotive or aircraft systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
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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
- G06F11/0793—Remedial or corrective actions
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Electronic Switches (AREA)
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- Devices For Checking Fares Or Tickets At Control Points (AREA)
Abstract
Reading abnormal repositioning method and system, method the invention discloses a kind of SD card includes：SD card reset circuit detects that SD card is inserted into vehicle electronic device, sends low level signal to CPU；CPU reads SD card data, and the data of the SD card of reading are compared with inner buffer, when judging that data do not update, sends low level reset signal to SD card reset circuit；SD card reset circuit powers off SD card；SD card reset circuit sends high level signal to CPU；CPU sends high level signal to SD card reset circuit；SD card reset circuit powers on SD card, and judges that SD card is inserted into vehicle electronic device.The present invention is in a manner that software and hardware is combined, software triggering is carried out by CPU, control SD card reset circuit performs to realize actually enters presence and power supply is normal in SD card, and analog physical plug SD card re-recognizes, data are read, improve the antijamming capability of SD card.
Description
Technical field
The present invention relates to storage card resetting technique field, more particularly to a kind of SD card reads abnormal repositioning method and is
System.
Background technology
Vehicle electronic device at present on automobile is more and more, and function is increasingly abundanter.Many automobiles, passenger car dispatch from the factory all
Equipped with a variety of car-mounted terminals, dispatch from the factory the driving recording equipped with law enforcement Tachographs, passenger car car owner oneself installation such as commercial car
Instrument and the video monitoring recorder of commercial car operator oneself installation etc..These equipment largely have SD card interface, are used for
Broadcast audio-video document, storage monitor video data, storage car body state parameter etc..In order to easy to operate, these interfaces are past
Toward the place that human hand can be touched is placed on, when winter or relatively dry weather, human body touches interface
When usually generate stronger Electro-static Driven Comb.SD card may can be caused to fail there are many factor in vehicle environment, but SD exists
It is present with one kind that exception is most serious after being hit by electrostatic, will causes equipment can not normal read data.Again do not pulling out
In the case of plug-in card, even if equipment is re-recognized or re-powered to SD card in software view, due to SD card in itself
Through being in abnormality, so equipment still cannot carry out SD card normally to identify and read.Such as CN201110453027.2
It is only re-powered in start-up phase use and improves SD card discrimination, be effectively to weigh particularly with an electrostatic strike reset power
New identification SD card.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, propose that a kind of SD card reads abnormal repositioning method and is
System in a manner that software and hardware is combined, carries out software triggering, control SD card reset circuit performs to realize by CPU
Presence being actually entered in SD card and power supply being normal, analog physical plug SD card re-recognizes, and reads data, improves
The antijamming capability of SD card.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of SD card reads abnormal repositioning method, includes the following steps：
1) test side of SD card reset circuit detects that SD card is inserted into vehicle electronic device, and low level is sent by output terminal
Signal is to CPU；
2) CPU receives the low level signal that SD card reset circuit output terminal is sent；SD card data are read, and by the SD of reading
The data of card are compared with inner buffer, when judging that data do not update, send low level reset signal to SD card reset circuit
Reset terminal；
3) reset terminal of SD card reset circuit receives the low level reset signal that CPU is sent, and SD card is powered off；SD card resets
Circuit judges that SD card is not inserted into vehicle electronic device, and high level signal is sent to CPU by output terminal；
4) CPU receives the high level signal that the output terminal of SD card reset circuit is sent；High level signal to SD card is sent to answer
The reset terminal of position circuit；
5) reset terminal of SD card reset circuit receives the high level signal that CPU is sent, and SD card is powered on；SD card reset circuit
Judge SD card insertion vehicle electronic device.
Preferably, the reading SD card data, and the data of the SD card of reading and inner buffer are carried out in comparison step,
The number for reading SD card data and being compared is to pre-set.
Preferably, the SD card reset circuit includes：
First switch circuit, the first switch circuit include a triode, and the base stage of the triode passes through reset terminal
It is connected with CPU, emitter is connected by test side with SD card, and collector is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor and the triode
Collector be connected, source electrode is connected with system power supply, drain electrode be connected with SD card power end.
Preferably, the first switch circuit further includes：First pull-up resistor, the second current-limiting resistance and the 3rd pull-up electricity
Resistance；First pull-up resistor and the second current-limiting resistance are series between system power supply and the base stage of the triode；It is described multiple
Position end is connected by second current-limiting resistance with the base stage of the triode；The collector of the triode passes through the described 3rd
Pull-up resistor is connected with system power supply.
Preferably, the first switch circuit further includes：First filter capacitor, second current-limiting resistance and described first
Filter capacitor is series between the reset terminal and ground.
Preferably, the system power supply is 3.3V.
Preferably, a kind of SD card reads abnormal reset system, including：Be arranged on CPU inside vehicle electronic device and
SD card reset circuit and the SD card that can be plugged on the vehicle electronic device；The SD card reset circuit with it is described
SD card connects to detect the plug state of the SD card；The CPU is connected to receive with the SD card reset circuit described
The plug state of SD card；The CPU is connected to read SD card data with the SD card, and is according to data update condition adjudgement
It is no to read the SD card data exception, so to SD card reset circuit triggering reset signal make SD card again lower electricity or on
Electricity.
Preferably, the SD card reset circuit includes：
First switch circuit, the first switch circuit include a triode, and the base stage of the triode passes through reset terminal
It is connected with CPU, emitter is connected by test side with SD card, and collector is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor and the triode
Collector be connected, source electrode is connected with system power supply, drain electrode be connected with SD card power end.
Preferably, the first switch circuit further includes：First pull-up resistor, the second current-limiting resistance and the 3rd pull-up electricity
Resistance；First pull-up resistor and the second current-limiting resistance are series between system power supply and the base stage of the triode；It is described multiple
Position end is connected by second current-limiting resistance with the base stage of the triode；The collector of the triode passes through the described 3rd
Pull-up resistor is connected with system power supply.
Preferably, the first switch circuit further includes：First filter capacitor, second current-limiting resistance and described first
Filter capacitor is series between the reset terminal and ground.
The advantageous effect that technical solution provided by the invention is brought is：
1st, the mode that the present invention is combined by using software and hardware improves the antijamming capability of SD；
2nd, the present invention is sent to SD card reset circuit to simulate the physics plug shape of SD card by CPU triggerings reset signal
Formula improves the discrimination of SD card and resets success rate, can effectively solve the problem that the digital independent abnormal problem of SD during use,
Also improve the Experience Degree of client；
3rd, the present invention controls the power supply state of SD card by the insertion detection foot of SD card, saves system resource, avoids
Circuit damage caused by wrong plug card or card damage；
4th, the present invention gives SD card power supply using system 3.3V power supplys, and reasonably avoiding SD card caused by abnormity of power supply is abnormal.
The present invention is described in further detail with reference to the accompanying drawings and embodiments, but a kind of SD card reading of the present invention is different
Normal repositioning method and system is not limited to embodiment.
Description of the drawings
Fig. 1 is the main flow chart of the method for the present invention；
Fig. 2 is that the CPU of the method for the present invention embodiment judges to read the flow chart of SD card data exception；
Fig. 3 is the circuit diagram of the embodiment of the present invention.
Specific embodiment
Referring to Fig. 1, a kind of SD card of the invention reads abnormal repositioning method, includes the following steps：
Step 101, the test side of SD card reset circuit detects that SD card is inserted into vehicle electronic device, is sent by output terminal
Low level signal is to CPU；
Step 102, CPU receives the low level signal that SD card reset circuit output terminal is sent；SD card data are read, and will be read
The data of the SD card taken are compared with inner buffer, when judging that data do not update, are sent low level reset signal to SD card and are answered
The reset terminal of position circuit；
Step 103, the reset terminal of SD card reset circuit receives the low level reset signal that CPU is sent, and SD card is powered off；SD
Card reset circuit judges that SD card is not inserted into vehicle electronic device, and high level signal is sent to CPU by output terminal；
Step 104, CPU receives the high level signal that the output terminal of SD card reset circuit is sent；Send high level signal extremely
The reset terminal of SD card reset circuit；
Step 105, the reset terminal of SD card reset circuit receives the high level signal that CPU is sent, and SD card is powered on；SD card is answered
Position circuit judges SD card insertion vehicle electronic device.
Further, wherein, the reading SD card data and compare the data of the SD card of reading with inner buffer
In step, the number for reading SD card data and being compared is to pre-set.Specifically, sentence as described in Figure 2 for the CPU of the present embodiment
The disconnected flow chart for reading SD card data exception, is as follows：
Step 201, vehicle electronic device powers on；
Step 202, it is inserted into SD card or SD is already inserted into vehicle electronic device；
Step 203, SD card reset circuit powers on SD card after detecting SD card insertion；
Step 204, CPU reads SD card data；
Step 205, the SD card data of reading and inner buffer data are compared CPU；
Step 206, CPU judges whether data update；If updated, return to step 204；If do not updated, step is performed
Rapid 207；
Step 207, CPU reads SD card data；
Step 208, the SD card data of reading and inner buffer data are compared CPU；
Step 209, CPU judges whether data update；If updated, return to step 204；If do not updated, step is performed
Rapid 210；
Step 210, judge that CPU can not read SD card data, CPU sends reset signal.
Further, as shown in figure 3, the SD card reset circuit includes：
First switch circuit, the first switch circuit include a triode Q1, and the base stage B of the triode passes through reset
End is connected with CPU, and emitter E is connected by test side with SD card, and collector C is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor Q2, the grid G of the metal-oxide-semiconductor and three pole
The collector C of pipe is connected, and source S is connected with 3.3V system power supplies, and drain D is connected with SD card power end.
Further, the first switch circuit further includes：On first pull-up resistor R1, the second current-limiting resistance R2 and the 3rd
Pull-up resistor R3；The first pull-up resistor R1 and the second current-limiting resistance R2 is series at 3.3V system power supplies and the triode Q1's
Between base stage B；The reset terminal is connected by the second current-limiting resistance R2 with the base stage B of the triode Q1；Three pole
The collector C of pipe Q1 is connected by the 3rd pull-up resistor R3 with 3.3V system power supplies.
Further, the first switch circuit further includes：First filter capacitor C1, the second current-limiting resistance R2 and institute
The first filter capacitor C1 is stated to be series between the reset terminal and ground.
Further, a kind of SD card reads abnormal reset system, including：The CPU being arranged on inside vehicle electronic device
With SD card reset circuit and the SD card that can be plugged on the vehicle electronic device；The SD card reset circuit and institute
SD card connection is stated for detecting the plug state of the SD card；The CPU is connected with the SD card reset circuit for receiving
State the plug state of SD card；The CPU is connected to read SD card data with the SD card, and according to data update condition adjudgement
Whether read the SD card data exception, so to SD card reset circuit triggering reset signal make SD card again lower electricity or on
Electricity.
The SD card reset circuit includes：
First switch circuit, the first switch circuit include a triode Q1, and the base stage B of the triode passes through reset
End is connected with CPU, and emitter E is connected by test side with SD card, and collector C is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor Q2, the grid G of the metal-oxide-semiconductor and three pole
The collector C of pipe is connected, and source S is connected with 3.3V system power supplies, and drain D is connected with SD card power end.
Further, the first switch circuit further includes：On first pull-up resistor R1, the second current-limiting resistance R2 and the 3rd
Pull-up resistor R3；The first pull-up resistor R1 and the second current-limiting resistance R2 is series at 3.3V system power supplies and the triode Q1's
Between base stage B；The reset terminal is connected by the second current-limiting resistance R2 with the base stage B of the triode Q1；Three pole
The collector C of pipe Q1 is connected by the 3rd pull-up resistor R3 with 3.3V system power supplies.
Further, the first switch circuit further includes：First filter capacitor C1, the second current-limiting resistance R2 and institute
The first filter capacitor C1 is stated to be series between the reset terminal and ground.
Specifically, the principle that the SD card reads abnormal reset system is as follows：
The test side of SD card reset circuit detects that SD card is inserted into vehicle electronic device；The emitter E of triode Q1 is drawn
Low to arrive low level, triode Q1 is turned on, and the collector C of triode Q1 is pulled down to low level by high level 3.3V；The grid of metal-oxide-semiconductor Q2
Pole G is pulled low, and metal-oxide-semiconductor conducting, system power supply is powered by drain D to SD card power supply；The collector C of triode Q1 passes through output
End sends low level signal to CPU；
CPU receives the low level signal that SD card reset circuit output terminal is sent, and judges there is SD card insertion, starts and reads SD
Card data, and the data of the SD card of reading are compared with inner buffer, when judging that data do not update, send low level and reset
Signal to SD card reset circuit reset terminal；
After the reset terminal of SD card reset circuit receives the low level reset signal that CPU is sent, the base stage B of the triode Q1
Low level, the triode Q1 cut-offs are pulled down to, triode Q1 collectors C is driven high；The metal-oxide-semiconductor Q2 grid Gs are driven high,
Metal-oxide-semiconductor Q2 ends, and 3.3V system power supplies stop powering to SD card power supply；At this point, SD card reset circuit judges that SD card is not inserted into vehicle
Electronic equipment is carried, high level signal is sent to CPU by output terminal；
CPU receives the high level signal that the output terminal of SD card reset circuit is sent；High level signal to SD card is sent to reset
The reset terminal of circuit；The reset terminal of SD card reset circuit receives the high level signal that CPU is sent, the emitter E quilt of triode Q1
Low level, triode Q1 conductings are pulled down to, the collector C of triode Q1 is pulled down to low level by high level 3.3V；Metal-oxide-semiconductor Q2's
Grid G is pulled low, and metal-oxide-semiconductor conducting, system power supply is powered by drain D to SD card power supply；The collector C of triode Q1 passes through defeated
Outlet sends low level signal to CPU.
So far, it is engaged by the software triggering of CPU with the control of SD card reset circuit, completes once reading SD card data
Reset when abnormal is realized when SD card is hit by electrostatic, and SD card exception CPU can not normally read SD card data, and detect
Foot is again effective, the process of analog physical plug SD card when power supply supply is normal.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of SD card reads abnormal repositioning method, which is characterized in that includes the following steps：
1) test side of SD card reset circuit detects that SD card is inserted into vehicle electronic device, and low level signal is sent by output terminal
To CPU；
2) CPU receives the low level signal that SD card reset circuit output terminal is sent；SD card data are read, and by the SD card of reading
Data are compared with inner buffer, when judging that data do not update, send low level reset signal answering to SD card reset circuit
Position end；
3) reset terminal of SD card reset circuit receives the low level reset signal that CPU is sent, and SD card is powered off；SD card reset circuit
Judge that SD card is not inserted into vehicle electronic device, high level signal is sent to CPU by output terminal；
4) CPU receives the high level signal that the output terminal of SD card reset circuit is sent；It sends high level signal to SD card and resets electricity
The reset terminal on road；
5) reset terminal of SD card reset circuit receives the high level signal that CPU is sent, and SD card is powered on；SD card reset circuit judges
SD card is inserted into vehicle electronic device.
2. SD card according to claim 1 reads abnormal repositioning method, which is characterized in that the reading SD card data,
And carry out the data of the SD card of reading and inner buffer in comparison step, the number for reading SD card data and being compared is pre-
It sets.
3. SD card according to claim 2 reads abnormal repositioning method, which is characterized in that the SD card reset circuit bag
It includes：
First switch circuit, the first switch circuit include a triode, and the base stage of the triode passes through reset terminal and CPU
It is connected, emitter is connected by test side with SD card, and collector is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor, the collection of the grid of the metal-oxide-semiconductor and the triode
Electrode is connected, and source electrode is connected with system power supply, and drain electrode is connected with SD card power end.
4. SD card according to claim 3 reads abnormal repositioning method, which is characterized in that the first switch circuit is also
Including：First pull-up resistor, the second current-limiting resistance and the 3rd pull-up resistor；First pull-up resistor and the second current-limiting resistance string
It is coupled between system power supply and the base stage of the triode；The reset terminal passes through second current-limiting resistance and the triode
Base stage be connected；The collector of the triode is connected by the 3rd pull-up resistor with system power supply.
5. SD card according to claim 4 reads abnormal repositioning method, which is characterized in that the first switch circuit is also
Including：First filter capacitor, second current-limiting resistance and first filter capacitor are series between the reset terminal and ground.
6. SD card according to claim 3 reads abnormal repositioning method, which is characterized in that the system power supply is
3.3V。
7. a kind of SD card reads abnormal reset system, which is characterized in that including：The CPU being arranged on inside vehicle electronic device
With SD card reset circuit and the SD card that can be plugged on the vehicle electronic device；The SD card reset circuit and institute
SD card connection is stated for detecting the plug state of the SD card；The CPU is connected with the SD card reset circuit for receiving
State the plug state of SD card；The CPU is connected to read SD card data with the SD card, and according to data update condition adjudgement
Whether read the SD card data exception, so to SD card reset circuit triggering reset signal make SD card again lower electricity or on
Electricity.
8. SD card according to claim 7 reads abnormal reset system, which is characterized in that the SD card reset circuit bag
It includes：
First switch circuit, the first switch circuit include a triode, and the base stage of the triode passes through reset terminal and CPU
It is connected, emitter is connected by test side with SD card, and collector is connected by output terminal with CPU；
Second switch circuit, the second switch circuit include a metal-oxide-semiconductor, the collection of the grid of the metal-oxide-semiconductor and the triode
Electrode is connected, and source electrode is connected with system power supply, and drain electrode is connected with SD card power end.
9. SD card according to claim 8 reads abnormal reset system, which is characterized in that the first switch circuit is also
Including：First pull-up resistor, the second current-limiting resistance and the 3rd pull-up resistor；First pull-up resistor and the second current-limiting resistance string
It is coupled between system power supply and the base stage of the triode；The reset terminal passes through second current-limiting resistance and the triode
Base stage be connected；The collector of the triode is connected by the 3rd pull-up resistor with system power supply.
10. SD card according to claim 9 reads abnormal reset system, which is characterized in that the first switch circuit
It further includes：First filter capacitor, second current-limiting resistance are series at the reset terminal and ground with first filter capacitor
Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610998935.2A CN108073462B (en) | 2016-11-14 | 2016-11-14 | Reset method and system for SD card read exception |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610998935.2A CN108073462B (en) | 2016-11-14 | 2016-11-14 | Reset method and system for SD card read exception |
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| Publication Number | Publication Date |
|---|---|
| CN108073462A true CN108073462A (en) | 2018-05-25 |
| CN108073462B CN108073462B (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610998935.2A Active CN108073462B (en) | 2016-11-14 | 2016-11-14 | Reset method and system for SD card read exception |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109147088A (en) * | 2018-07-17 | 2019-01-04 | 苏州车付通信息科技有限公司 | Intelligent driving behavioral data collector and acquisition method |
| CN114844179A (en) * | 2022-06-30 | 2022-08-02 | 荣耀终端有限公司 | Electronic device and electricity meter resetting method |
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| US6271675B1 (en) * | 1996-06-21 | 2001-08-07 | Kabushiki Kaisha Toshiba | Terminal contact-type IC card having terminal contact fault detector, IC card system using the IC card, and IC for the IC card |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109147088A (en) * | 2018-07-17 | 2019-01-04 | 苏州车付通信息科技有限公司 | Intelligent driving behavioral data collector and acquisition method |
| CN114844179A (en) * | 2022-06-30 | 2022-08-02 | 荣耀终端有限公司 | Electronic device and electricity meter resetting method |
| CN114844179B (en) * | 2022-06-30 | 2022-11-22 | 荣耀终端有限公司 | Electronic device and electricity meter resetting method |
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| Publication number | Publication date |
|---|---|
| CN108073462B (en) | 2022-05-03 |
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