CN106295432A - The data detection method of a kind of SD card and system and the draw-in groove of external SD card - Google Patents
The data detection method of a kind of SD card and system and the draw-in groove of external SD card Download PDFInfo
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- CN106295432A CN106295432A CN201610645097.0A CN201610645097A CN106295432A CN 106295432 A CN106295432 A CN 106295432A CN 201610645097 A CN201610645097 A CN 201610645097A CN 106295432 A CN106295432 A CN 106295432A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0013—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers
- G06K7/0047—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers for reading/sensing record carriers having edge contacts
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0013—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers
- G06K7/0056—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers housing of the card connector
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- Computer Vision & Pattern Recognition (AREA)
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- Credit Cards Or The Like (AREA)
Abstract
The present invention provides the data detection method of a kind of SD card and system and the draw-in groove of external SD card, including: it is in running order that step S10 utilizes I/O control to open external SD card；Step S20 obtains the working clock frequency that user presets to the input of described external SD card；The described default working clock frequency that step S40 inputs according to user, to the data message of the capacity that described external SD read-write is preset；Step S50 detects the data message concordance of described external SD card read-write；When consistent, perform step S60；Step S60 utilizes described I/O control to close the duty of external SD card.Original detection pattern is changed by the present invention, by SD card draw-in groove controls the innovation of interface, simulates and opens SD card and disconnect, it is achieved that the automatic test that SD card sampling time sequence postpones, save manpower and time cost, shorten the research and development of products cycle.
Description
Technical field
The present invention relates to the technical field of integrated circuit detection, particularly relate to the data detection method of a kind of SD card and be
System and the draw-in groove of external SD card.
Background technology
Along with enriching of various multimedia recreation contents, the storage volume of electronic product used is required more to come by consumer
The highest, SD card has been widely used in various electronic equipment as storage device, itself otherwise as product built-in storage dress
Put；Extend storage device as it, on the body of electronic product, be i.e. provided with SD interface, as needed electronic product to set with outside
When standby interchange of data or the increase storage volume of electronic product own, it is possible to directly SD card is inserted the SD clamping on electronic product
Mouthful.
Stable and reliable in work in order to ensure SD card, during production, SD card sampling time sequence typically will be surveyed by production firm
Examination, is all to directly utilize SD card insertion to connect product and test to the test of SD card interface in the market.This mode is for research and development
And finished product stage all Shortcomings:
First, the read-write frequency of different its systems of electronic product is different, occurs when accessing external SD card existence read-write data
The phenomenon of mistake；Secondly, research and development and finished product acceptance phase, figure plugs in test card slot difference, causes the easily abrasion of SD card
Or burn, increase testing cost；Again, owing to SD card volume is the least, tester operates very inconvenient, not manageability.
Summary of the invention
It is an object of the present invention to provide data detection method and the system of a kind of SD card, its objective is to be capable of in research and development or
The data message read-write automatic test that SD card sampling time sequence is postponed by person's finished product stage, it is possible to save testing cost, be easy to pipe
Reason, safe and reliable.
The technical scheme that the present invention provides is as follows:
A kind of data detection method of SD card, including:
It is in running order that step S10 utilizes I/O control to open external SD card；
Step S20 obtains the working clock frequency that user presets to the input of described external SD card；
The described default working clock frequency that step S40 inputs according to user, the appearance preset to described external SD read-write
The data message of amount；
Step S50 detects the data message concordance of described external SD card read-write；When consistent, perform step S60.
Step S60 utilizes described I/O control to close the duty of external SD card.
It is further preferred that also include before described step S40:
The described default working clock frequency that step S30 inputs according to user, arranges described external SD card read-write data
The sequential delay parameter of information.
It is further preferred that described step S50 includes:
Step S51 extracts sample number in the described data message in the byte section preset of write from described external SD card
According to；
Step S52 extracts the described sample data in the described default byte section of reading from described external SD card；
Described step S51 is extracted and is write described sample data and the described step S52 extraction described sample of reading by step S53
Data are compared；
When at least write with read sample data comparison described in corresponding byte section inconsistent time, return performs step
Rapid S30.
It is further preferred that include when to described external SD card read-write data message:
When reading data message to described external SD card, stop writing data message to described external SD；
When writing data message to described external SD card, stop reading data message to described external SD.
It is further preferred that also include:
Utilize external SD card duty described in the Automatic level control that the GPIO of described I/O control exports.
A kind of detecting system of the data detection method of SD card, including:
SD card opening module, is used for utilizing I/O control to open external SD card in running order；
Frequency acquisition module, when described external SD card is in running order, is used for obtaining user to described external SD card
The working clock frequency that input is preset；
Data read-write module, the working clock frequency preset obtained according to described frequency acquisition module, for described
The data message of the capacity that external SD read-write is preset；
Data detection module, for judging that the data message that described data read-write module is read and write is the most consistent；
Module closed by SD card, when described data detection module detection data message is consistent, utilizes described I/O control to close
Close the duty of external SD card.
It is further preferred that include:
Information arranges module, electrically connects with described frequency acquisition module, described data read-write module respectively, is used for arranging institute
State the sequential delay parameter of external SD card read-write data message.
It is further preferred that described data detection module includes:
First sample data extracts submodule, in the byte section preset extracting write from described external SD card
Sample data in described data message；
Second sample data extracts submodule, for extracting the described default byte section of reading from described external SD card
Interior described sample data；
Sample data comparer module, for extracting, by described first sample data, sample data and the institute that submodule extracts
The described sample data stating the second sample data extraction submodule extraction is compared；
When the result of described sample data comparison is inconsistent, described information arranges module and is once again set up described sequential time delay
Parameter.
A kind of draw-in groove of external SD card, including: external SD card is arranged in special external SD card draw-in groove, at described draw-in groove
Connection contact, the frequency contact all the time that respectively works electrically connected with described external SD card, reading and writing data contact are inside set；
The DET contact of described external SD card controls to electrically connect with IO, for controlling the duty of described external SD.
The data detection method of a kind of SD card provided by the present invention and system and the draw-in groove of external SD card, it is possible to bring
At least one beneficial effect below:
1, the present invention is by the setting to external SD working clock frequency, judges that data energy read and write by SD card with this understanding
Power, judges concordance according to the data of write with the data of reading, with the running parameter that this judges SD card the most to be detected is
No coupling is correct, it is achieved that the automatic test of SD card.
2, for the detection of data message of SD card read-write in the present invention, be according to set in the range of delay parameter right
Answer the detection of byte, when the contrast of at least one byte is inconsistent, stops at detection work under this delay parameter, reset and prolong
Parameter late, and the setting of delay parameter is to carry out according to order from small to large, has the delay of maximum when ensureing SD card work
Property, ensure the safe and reliable of reading and writing data simultaneously.
3, original detection pattern is changed by the present invention, and by SD card draw-in groove controls the innovation of interface, simulation is to SD
Card is opened and disconnects, it is achieved that the automatic test that SD card sampling time sequence postpones, and saves manpower and time cost, shortens
The research and development of products cycle, and after the encapsulation using level of abstraction, there is the highest safety, will not be due in automatic test
Unconscious mistake causes system crash to cause the destruction of software and hardware.
Accompanying drawing explanation
Below by the way of the most understandable, accompanying drawings preferred implementation, the Data Detection to a kind of SD card
Above-mentioned characteristic, technical characteristic, advantage and the implementation thereof of the draw-in groove of method and system and external SD card are further described.
Fig. 1 is the flow chart of the embodiment of the data detection method of the present invention a kind of SD card；
Fig. 2 is the flow chart of another embodiment of the data detection method of the present invention a kind of SD card；
Fig. 3 is the flow chart of another embodiment of the data detection method of the present invention a kind of SD card；
Fig. 4 is the structure chart of the embodiment of the data detection system of the present invention a kind of SD card；
Fig. 5 is the structure chart of another embodiment of the data detection system of the present invention a kind of SD card；
Fig. 6 is the structure chart of another embodiment of the data detection system of the present invention a kind of SD card；
Fig. 7 is the circuit diagram of the embodiment of the draw-in groove of the present invention a kind of SD card；
Fig. 8 is the circuit diagram of another embodiment of the draw-in groove of the present invention a kind of SD card.
Detailed description of the invention
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will comparison accompanying drawing explanation
The detailed description of the invention of the present invention.It should be evident that the accompanying drawing in describing below is only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing, and obtain other embodiment.
For making simplified form, only schematically show part related to the present invention in each figure, they do not represent
It is as the practical structures of product.It addition, so that simplified form readily appreciates, some figure has identical structure or function
Parts, only symbolically depict one of them, or have only marked one of them.In this article, " one " not only represents
" only this ", it is also possible to represent the situation of " more than one ".
The present invention provides the embodiment of the data detection method of a kind of SD card, with reference to shown in Fig. 1；Including:
It is in running order that step S10 utilizes I/O control to open external SD card；
Step S20 obtains the working clock frequency that user presets to the input of described external SD card；
The described default working clock frequency that step S40 inputs according to user, the appearance preset to described external SD read-write
The data message of amount；
Step S50 detects the data message concordance of described external SD card read-write；When consistent, perform step S60.
Step S60 utilizes described I/O control to close the duty of external SD card.
Concrete, in the present embodiment, utilize the low and high level of the I/O port of CPU to control the duty of external SD card, when
When entering test pattern, the IO of CPU controls to send high level, arranges the source operating frequency of SD card, according to the work frequency set
Rate sticks into the read-write operation of row data to SD, and the quantity setting read-write data is stored in the storage folder of SD card, works as root
After completing read-write operation according to the information of preset capacity, further checking its under the conditions of this operating frequency, the data of reading and writing
The data entered are the most consistent, verify the accuracy to the running parameter that SD card is arranged with this, when the number reading in and writing after checking
According to when being uniform data information, utilize cpu controller IO to send low level, close the duty of SD card, namely be equivalent to not
SD card is had to carry out verifying work.
Preferably, also include before described step S40:
The described default working clock frequency that step S30 inputs according to user, arranges described external SD card read-write data
The sequential delay parameter of information.
Concrete, with reference to shown in Fig. 2；The present embodiment increases on the basis of a upper embodiment step S30；According to SD
The operating frequency of the setting of card, further according to being arranged under this operating frequency the sampling time sequence produced during reading and writing data
Retardation parameter.
Preferably, described step S50 includes:
Step S51 extracts sample data in the described data message in the byte section preset of write from described external SD card；
Step S52 extracts the described sample data in the described default byte section of reading from described external SD card；
Described step S51 is extracted and is write described sample data and the described step S52 extraction described sample of reading by step S53
Data are compared；
When at least write with read sample data comparison described in corresponding byte section inconsistent time, return performs step
Rapid S30.
Concrete, with reference to shown in Fig. 3；The present embodiment is continued on the basis of above example；At the work clock set
During frequency under conditions of the sequential time delay amount of further setting data read-write, detect the SD card correctness to reading and writing data；Specifically
Detection method be that frequency is 20ns as 12M, the retardation concurrently set when setting when；To external SD card write 512
The data of individual byte, are saved in after write in the temporary file folder of SD card, read further and write in the temporary file of SD card presss from both sides
512 byte datas entered, when the data volume being stored in is excessive, takes the extracting mode of sample formula, take it in the inside of system
In the data message of a certain byte end, compare, read 25-366 byte section data message, equally when reading sample data
In the range of the sampling parameter postponed, read 25-366 byte section data message；Each corresponding byte is compared, as
Really comparison the most so proves under the frequency that SD is stuck in setting, and it is correct for setting the read-write of data under delay parameter, the most right
Detect successfully in SD card；As long as oneself one of them appearance of comparison is abnormal, then prove that set data under delay parameter reads at this
Write inconsistent, reset delay parameter further, again verify.Delay parameter starts checking from minimum parameter, takes maximum
Delay parameter.
Preferably, include when to described external SD card read-write data message:
When reading data message to described external SD card, stop writing data message to described external SD；
When writing data message to described external SD card, stop reading data message to described external SD.
Concrete, when checking reads and writes data message to external SD card, read or write and can only single carry out, this avoid
Detection process causes the entanglement of information.
Preferably, also include:
Utilize external SD card duty described in the Automatic level control that the GPIO of described I/O control exports.
The present invention also puies forward the embodiment of the data detection method of a kind of SD card, with reference to shown in Fig. 3；Including:
Utilize external SD card duty described in the Automatic level control that the GPIO of described I/O control exports；
It is in running order that step S10 utilizes I/O control to open external SD card；Step S20 obtains user to described external
The working clock frequency that the input of SD card is preset；The described default working clock frequency that step S30 inputs according to user, arranges institute
State the sequential delay parameter of external SD card read-write data message；The described default work clock that step S40 inputs according to user
Frequency, to the data message of the capacity that described external SD read-write is preset；Step S50 detects the data letter of described external SD card read-write
Breath concordance；When consistent, perform step S60；Step S51 is extracted in the byte section preset of write from described external SD card
Described data message in sample data；When reading data message to described external SD card, stop writing data to described external SD
Information；Step S52 extracts the described sample data in the described default byte section of reading from described external SD card；When to institute
State external SD card when writing data message, stop reading data message to described external SD；Described step S51 is extracted and is write by step S53
Enter described sample data to compare with the described step S52 extraction described sample data of reading；When an at least write and reading
Go out correspondence byte section described in sample data comparison inconsistent time, return perform step S30.
The present invention also provides for the embodiment of the data detection system of a kind of SD card, with reference to shown in Fig. 4, including:
SD card opening module 10, is used for utilizing I/O control to open external SD card in running order；
Frequency acquisition module 20, when described external SD card is in running order, is used for obtaining user to described external SD
The working clock frequency that card input is preset；
Data read-write module 40, the working clock frequency preset obtained according to described frequency acquisition module, for institute
State the data message of the capacity that external SD read-write is preset；
Data detection module 50, for judging that the data message that described data read-write module is read and write is the most consistent；
SD card close module 60, when described data detection module 50 detect data message consistent time, utilize described IO to control
Device cuts out the duty of external SD card.
Concrete, in the present embodiment, utilize the low and high level of the I/O port of SD card opening module 10CPU to control external SD card
Duty, when entering test mode, the IO of CPU controls to send high level, and frequency acquisition module 20 arranges the source of SD card
Head operating frequency, sticks into the read-write operation of row data, and sets according to the operating frequency set to the SD of data read-write module 40
The quantity of read-write data is stored in the storage folder of SD card, after completing read-write operation according to the information of preset capacity, enters
One step utilize data detection module 50 verify its under the conditions of this operating frequency, the data of reading and the data of write whether
Cause, verify the accuracy to the running parameter that SD card is arranged with this, when the data read in and write after checking are uniform data letters
During breath, utilize cpu controller IO to send low level, close the duty of SD card, namely be equivalently employed without SD card and verify
Work.
Preferably, including:
Information arranges module 30, electrically connects with described frequency acquisition module 20, described data read-write module 40 respectively, is used for
The sequential delay parameter of described external SD card read-write data message is set.
Concrete, with reference to shown in Fig. 5；The information that increases on the basis of a upper embodiment in the present embodiment arranges module 30；
According to the operating frequency of the setting to SD card, further according to being arranged on generation during reading and writing data under this operating frequency
Sampling time sequence retardation parameter.
Preferably, described data detection module 50 includes:
First sample data extracts submodule 51, in the byte section preset extracting write from described external SD card
Described data message in sample data；
Second sample data extracts submodule 52, for extracting the described default byte of reading from described external SD card
Described sample data in Duan；
Sample data comparer module 53, for by described first sample data extract submodule extract sample data with
Described second sample data is extracted the described sample data of submodule extraction and is compared；
When the result of described sample data comparison is inconsistent, described information arranges module the most described sequential time delay ginseng
Number.
Concrete, with reference to shown in Fig. 6；The present embodiment is continued on the basis of above example；At the work clock set
During frequency under conditions of the sequential time delay amount of further setting data read-write, data detection module 50 is utilized to detect SD card to data
The correctness of read-write；Concrete detection method is, when setting when, frequency is 20ns as 12M, the retardation concurrently set；To
The data of external SD card 512 bytes of write, the temporary file folder being saved in SD card after write is interior, further temporary from SD card
Read 512 byte datas of write in depositing file, when the data volume being stored in is excessive, take sample formula in the inside of system
Extracting mode, take the data message of the most a certain section of byte, compare, utilize first sample data extract submodule 51 from
Write 25-366 byte section data message is extracted, equally when reading sample data at the sampling parameter postponed in temporary file folder
In the range of, utilize the second sample data to extract submodule 52 in temporary file presss from both sides, extract the 25-366 byte section data read
Information；Sample data comparer module 53 is utilized to compare, each corresponding byte if comparison the most so proves SD
Being stuck under the frequency of setting, it is correct for setting the read-write of data under delay parameter, this time detects successfully for SD card；Comparison
As long as one of them appearance of byte is abnormal, then proves to set reading and writing data under delay parameter at this inconsistent, the most again set
Determine delay parameter, again verify.Delay parameter starts checking from minimum parameter, takes the delay parameter of maximum.
The present invention also provides for the draw-in groove of a kind of external SD card, including: external SD card is arranged on special external SD card draw-in groove
In, connection contact, the frequency contact all the time that respectively works electrically connected with described external SD card are set in described draw-in groove
(CLK), reading and writing data contact (DATAn)；
The DET contact of described external SD card controls to electrically connect with IO, for controlling the duty of described external SD.
Concrete, in the present embodiment, the CPU IO fly line idle by the selection one of the I/O port of CPU is built-in to removing
The DET pin of SD card draw-in groove of card detection sheet metal, controls external SD card duty, is a kind of to change original test hardware
Become；With reference to shown in Fig. 7 and Fig. 8, hardware plate 1, cpu2, cpu kernel 3, SD controller 4, I/O control 5, IO PAD 6；Cpu2 bag
Include cpu kernel 3, SD controller 4, I/O control 5；IO PAD 6 is on hardware plate 1.
The present invention also provides for the data detection system of a kind of SD card, with reference to shown in Fig. 7 and Fig. 8, including phase adjusted passage,
Drive layer interface, hardware interface model；Hardware interface model, it is provided that a hardware modifications mode, it is therefore an objective to by original TF clamping
Mouth detection pin is connected with IO PAD 6 on hardware plate, makes IO Automatic level control into, it is possible to change IO level by software and reaches
Process to simulation plug SD card；Drive layer interface upwards to provide for client layer and can directly control phase adjusted passage and fortune
The interface (providing the encapsulation of hardware interface model to client layer) of the module clock frequency of row state kernel, the most directly adjusts with phase place
It is mutual that joint passage carries out information；Its Main Function of phase adjusted passage is to accept to drive layer interface information, and controls CPU output
The sampling timing phase to SD card module；
Phase adjusted passage includes: SD controller, is suitable to the change accepting to carry out self-driven layer interface, and based on this to external
Storage device provides the sampling time sequence of specific delays amount；I/O control, is suitable to the storage device read-write requests initiated by processor
Bi-directional conversion is carried out with Digital Logic；SD controller and I/O control are packaged, for the user on upper strata in driving layer interface
There is provided and control interface；The IO control level sent by I/O control, is controlled the plug of SD card during each automatic test, passes through
Simulation plug resets SD controller internal state after each test loop, when making each test loop start in SD controller
Portion's state is all consistent, SD controller provide specific sampling time sequence to external SD card, and by storage control to external SD card
Read-write data, and judge the correctness of read-write under particular sample sequential time delay.
Driving layer interface includes: the clock bus of external SD card model, is suitable to provide external connection module under interior nuclear state
Sample timing frequency, external SD is stuck in initial phase and the most once accepts the setting of this sample timing frequency；Operating frequency attribute,
Be suitable to outside initial phase, dynamically change sample timing frequency and passage is provided；Abstract with SD controller, be suitable to client layer
Represent SD controller part details, such as the control depositor of sequential amount of delay, FREQUENCY CONTROL interface, data control interface etc.；With
And the effect to the change of SD controller reporting client layer；I/O control is abstract, is suitable to be controlled digital signal, is formed externally
Connect the plug signal of SD card detection pin.
Hardware interface model includes: the external SD card interface of improvement, for eliminating internal card detection sheet metal, and is examined
Test tube foot (shown in Fig. 7 and Fig. 8, middle DET pin) is connected with IO PAD, pin (CLK) and the data with CPU communication all the time
Reading and write pin (DATAn) of information are constant, it is ensured that the correct connection of signal of interest.
A kind of data detection system of the SD card of the present invention, before an automatic test cycle period starts, first
Carry out hardware modifications to prepare, select an idle CPU IO fly line to the SD card draw-in groove of removal internal card detection sheet metal
DET pin (this external SD card interface i.e. improved), the kernel in the cycle period that the software subsequently is tested oneself starts rank
Section, after external SD card inserts the external SD card draw-in groove improved, the clock bus work of the external SD card model in driving layer interface
Working frequency can be read by SD controller；After kernel starts, by driving, layer interface I/O control is abstract to be made client layer software
The level of IO PAD is high, now, CPU would consider that the external SD card draw-in groove of improvement already inserted into card, SD controller will be by
CPU resets (RESET), tests oneself the state in cycle, in then client layer software is by driving layer interface removing a upper software
Operating frequency attribute dynamically change frequency needed for external SD card work, and prolonged by SD controller its sampling time sequence of abstract change
The numerical value of amount late；Testing oneself the last of cycle at a software, system will carry out read-write operation to external SD card, if read-write contrast is lost
Lose, then enter next test loop after changing the numerical value of sampling time sequence retardation；If reading and writing successfully, then record this sampling time sequence
Retardation numerical value, and change the next test loop of entrance after the numerical value of sampling time sequence retardation, circulation is continued until numerical value
Increase to the maximum of sampling time sequence retardation numerical value, now loop ends, thus reach the purpose automatically tested.
It should be noted that, above-described embodiment all can independent assortment as required.The above is only the preferred of the present invention
Embodiment, it is noted that for those skilled in the art, in the premise without departing from the principle of the invention
Under, it is also possible to making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. the data detection method of a SD card, it is characterised in that including:
It is in running order that step S10 utilizes I/O control to open external SD card；
Step S20 obtains the working clock frequency that user presets to the input of described external SD card；
The described default working clock frequency that step S40 inputs according to user, reads and writes default capacity to described external SD
Data message；
Step S50 detects the data message concordance of described external SD card read-write；When consistent, perform step S60；
Step S60 utilizes described I/O control to close the duty of external SD card.
The data detection method of SD card the most according to claim 1, it is characterised in that also include before described step S40:
The described default working clock frequency that step S30 inputs according to user, arranges described external SD card read-write data message
Sequential delay parameter.
The data detection method of SD card the most according to claim 2, it is characterised in that described step S50 includes:
Step S51 extracts sample data in the described data message in the byte section preset of write from described external SD card；
Step S52 extracts the described sample data in the described default byte section of reading from described external SD card；
Described step S51 is extracted and is write described sample data and the described step S52 extraction described sample data of reading by step S53
Compare；
When at least write with read sample data comparison described in corresponding byte section inconsistent time, return execution step
S30。
The data detection method of SD card the most according to claim 3, it is characterised in that when reading and writing number to described external SD card
Include when it is believed that breath:
When reading data message to described external SD card, stop writing data message to described external SD；
When writing data message to described external SD card, stop reading data message to described external SD.
5. according to the data detection method of the arbitrary described SD card of claim 1-4, it is characterised in that also include:
Utilize external SD card duty described in the Automatic level control that the GPIO of described I/O control exports.
6. the detecting system of the data detection method that can perform the arbitrary described SD card of claim 1-5, it is characterised in that
Including:
SD card opening module, is used for utilizing I/O control to open external SD card in running order；
Frequency acquisition module, when described external SD card is in running order, is used for obtaining user and inputs to described external SD card
The working clock frequency preset；
Data read-write module, the working clock frequency preset obtained according to described frequency acquisition module, for described external
The data message of the capacity that SD read-write is preset；
Data detection module, for judging that the data message that described data read-write module is read and write is the most consistent；
Module closed by SD card, when described data detection module detection data message is consistent, outside utilizing described I/O control to close
Connect the duty of SD card.
The data detection system of SD card the most according to claim 6, it is characterised in that also include:
Information arranges module, electrically connects with described frequency acquisition module, described data read-write module respectively, be used for arranging described outside
Connect the sequential delay parameter of SD card read-write data message.
The data detection system of SD card the most according to claim 6, it is characterised in that described data detection module includes:
First sample data extracts submodule, described in the byte section preset extracting write from described external SD card
Sample data in data message；
Second sample data extracts submodule, in the described default byte section extracting reading from described external SD card
Described sample data；
Sample data comparer module, for extracting the sample data and described that submodule extracts by described first sample data
Two sample datas are extracted the described sample data of submodule extraction and are compared；
When the result of described sample data comparison is inconsistent, described information arranges module and is once again set up described sequential time delay ginseng
Number.
9. with the use of the draw-in groove of a kind of external SD card of data detection system for the SD card described in claim 6-8, its
It is characterised by, including: external SD card is arranged in special external SD card draw-in groove, arranges connection contact in described draw-in groove, with
The frequency contact all the time that respectively works of described external SD card electrical connection, reading and writing data contact；
The DET contact of described external SD card controls to electrically connect with IO, for controlling the duty of described external SD.
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