CN105446837B - The method, apparatus and system whether detection IIC interface device connects - Google Patents
The method, apparatus and system whether detection IIC interface device connects Download PDFInfo
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- CN105446837B CN105446837B CN201510155517.2A CN201510155517A CN105446837B CN 105446837 B CN105446837 B CN 105446837B CN 201510155517 A CN201510155517 A CN 201510155517A CN 105446837 B CN105446837 B CN 105446837B
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Abstract
The invention discloses a kind of method, apparatus and system whether detection IIC interface device connects, and belong to intelligent recognition field, which comprises issue initial signal；Issue the device address of slave；Judge whether the answer signal for receiving slave at the appointed time, if it is, successful connection is indicated, otherwise, it means that connection is failed；Issue termination signal.Compared with prior art, the method degree of testing the speed that whether detection IIC interface device of the invention connects is fast, and versatility is good, and real-time is good.
Description
Technical field
The present invention relates to intelligent recognition fields, particularly relate to a kind of method, apparatus whether detection IIC interface device connects
And system.
Background technique
When circuit design or system design, if there is IIC (also referred to as I2C or I2C and I2C etc.) interface
Device (hereinafter referred to as IIC device or slave), usually slave are connected on host that (so-called host refers to transmission by IIC interface
The equipment for issuing termination signal when issuing enabling signal when beginning, issuing clock signal and transmission termination, usual host are all
Processor (CPU), the equipment looked for by host are known as slave.), sometimes need to detect slave whether connect with host or
Welding, and whether secured connect or weld.As shown in Figure 1.Device A is welded on circuit board I；And device B is welded on electricity
It on the plate II of road, is connected on circuit board I by winding displacement, at this point, CPU is host, device A and device B are slave.
By taking Fig. 1 as an example, existing way is, if device A or device B are the IIC devices for having ID number, read its ID number and
Its true ID number is compared, if equal, indicates that device A or device B connect or weld with CPU, and connect or
That welds is very firm.
If device A or device B are the IIC devices of not ID number, be written into its some internal address or register
Then some value reads the value in the address or register again, whether with reading consistent, if unanimously also indicated that if comparing write-in
Device A or device B connect or weld with CPU, and connect or weld and is very secured.
Existing technology has the following problems:
The first, detection speed is slow；In the presence of IIC device, need to carry out multiple read-write operation to IIC device,
It could complete detection；In the case where IIC device is not present, after even more needing continuously to wait multiple time-out operations, ability
Complete detection.
The second, poor universality；Specific IIC device is also needed to consider with which kind of detection method；
Third, real-time are poor；One-time detection only is carried out to IIC device when equipment or system just power on, no
It is suitble to be measured in real time IIC device.
Summary of the invention
The present invention provides a kind of method, apparatus and system whether detection IIC interface device connects, this method detection speed
Degree is fast, and versatility is good, and real-time is good.
In order to solve the above technical problems, present invention offer technical solution is as follows:
A method of whether detection IIC interface device connects, comprising:
Issue initial signal；
Issue the device address of slave；
Judge whether the answer signal for receiving slave at the appointed time, if it is, indicate successful connection, conversely,
Then indicate that connection is failed；
Issue termination signal.
A kind of device whether detection IIC interface device connects, comprising:
First issues module, for issuing initial signal；
Second issues module, for issuing the device address of slave；
First judgment module, the answer signal for judging whether to receive slave at the appointed time, if it is, table
Show successful connection, otherwise, it means that connection is failed；
Third issues module, for issuing termination signal.
A kind of system whether detection IIC interface device connects, the dress whether connected including above-mentioned detection IIC interface device
It sets, and at least one the IIC device connected with the device whether the detection IIC interface device connect.
The invention has the following advantages:
Compared with prior art, in the method that whether detection IIC interface device of the invention connects, firstly, host is in IIC
Initial signal is issued in bus；Then, host issues the device address of slave on iic bus；The bus protocol of IIC interface is advised
It is fixed: " must be followed behind each byte transmitted one ' response bits ' ", accordingly it is found that slave is receiving host sending
Device address signal after, an answer signal can be issued；If host receives the answer signal of slave, then it represents that host with from
Otherwise machine successful connection indicates that host and slave are not connected with successfully that (including no slave, slave such as are not connected firmly at a variety of feelings
Condition)；After detection, termination detection process.
The method whether detection IIC interface device of the invention connects does not need to be written and read IIC device, not yet
Need multiple waiting-timeout, it is only necessary to which simple four step can be achieved with the purpose of detection, and detection speed is fast；
As long as the device of IIC interface, regardless of its type can be transferred through this regardless of it is either with or without the ID number of itself
Method detection, versatility are good；
The method whether detection IIC interface device of the invention connects do not need to the address of IIC device or register into
Row operation, no matter therefore IIC device configured and finished, IIC device will not all be impacted, not need first by address or to post
Numerical value in storage, which is read, to be saved, and after detection, is written back, therefore can be measured in real time at any time to IIC device,
Application scenarios are extensive and real-time is good.
Detailed description of the invention
Fig. 1 be one in the prior art include IIC interface circuit diagram；
Fig. 2 is clock signal figure of the iic bus when carrying out data transmission；
Fig. 3 is clock signal figure of the iic bus in starting and termination；
Fig. 4 is clock signal figure of the iic bus in response；
Fig. 5 is the clock signal figure of the answer signal of Host Detection IIC device；
Fig. 6 is the address format schematic diagram of IIC device；
Fig. 7 is the flow chart that data are written in iic bus；
Fig. 8 is the flow chart that iic bus reads data；
Fig. 9 is the flow chart one for the method whether detection IIC interface device of the invention connects；
Figure 10 is the flowchart 2 for the method whether detection IIC interface device of the invention connects；
Figure 11 is the structure chart one for the device whether detection IIC interface device of the invention connects；
Figure 12 is the structure chart two for the device whether detection IIC interface device of the invention connects；
Figure 13 is the structure chart three for the device whether detection IIC interface device of the invention connects；
Figure 14 is the structure chart for the system whether detection IIC interface device of the invention connects.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
On the one hand, the present invention provides a kind of method whether detection IIC interface device connects, as shown in Figure 9, comprising:
Step S101: initial signal is issued；
In this step, host issues initial signal on iic bus；
Step S102: the device address of slave is issued；
In this step, host issues the device address of slave on iic bus；
Step S103: judging whether the answer signal for receiving slave at the appointed time, if it is, indicating to connect into
Function, otherwise, it means that connection is failed；
Slave receive host sending device address information after, an answer signal can be issued, host according to whether
The answer signal is received to judge whether and slave successful connection；
Step S104: termination signal is issued.
After detection, termination signal is issued, the occupied state of bus, process in termination are discharged.
Iic bus is a kind of universal serial bus, and being includes bus ruling and high low speed devices needed for having multi-host system
The high performance serial bus of synchronizing function.
Iic bus only has two bidirectional signal lines.One is data line SDA, and another is clock line SCL.
Iic bus connects positive supply by pull-up resistor.When bus free, both threads are high level.It is connected in bus
Any device output low level, all the signal of bus will be made to be lower, i.e., the SDA and SCL of each device are wired AND relationships.
The device being each connected on iic bus has unique address.Data transmission between host and slave can be by
Host sends data to slave, and at this moment host is transmitter, and the slave that data are received in bus is then receiver.
When iic bus carries out data transmission, for clock line SCL signal between high period, the data on data line SDA are necessary
It keeps stablizing, high level or low level state of the only signal on clock line SCL between low period, on data line SDA
Just allow to change, clock signal is as shown in Figure 2.
For SCL line between high period, SDA line indicates initial signal from high level to low level variation；SCL line is high electricity
During flat, variation of the SDA line from low level to high level indicates termination signal, and clock signal is as shown in Figure 3.
Starting and termination signal are issued by host, and after initial signal generation, bus is at occupied shape
State；After termination signal generation, bus is at idle state.
Iic bus agreement regulation, it is 8 bit lengths that each byte, which must assure that,.When data transmission, highest order is first transmitted
(MSB), it must be followed behind each byte transmitted a response bits (i.e. a frame shares 9).If a period of time
The answer signal for not receiving slave inside then automatically considers slave and is correctly received data, and clock signal is as shown in Figure 4.
The process of iic bus reading and writing data is as follows:
By taking scene shown in FIG. 1 as an example, host is CPU in Fig. 1, and slave is device A and device B.
For IIC address of devices format as shown in figure 5, wherein MSB is highest order (the 7th), LSB is lowest order (the 0th), the
7 to the 1st addresses for equipment, the 0th is read and write control bit, carries out read or write to the device for indicating, wherein
0 indicates write operation, and 1 indicates read operation.
Assuming that the device address of device A is D1.
The process for writing data of iic bus, such as Fig. 6 are described in detail so that data DAT is written into the address D 2 of device A in CPU as an example
It is shown.
The process of the reading data of iic bus, such as Fig. 7 are described in detail for reading data DAT in the address D 2 of device A by CPU
It is shown.
The method whether existing detection IIC interface device connects is, in the case where IIC device is not present, if IIC
If device has the ID number of oneself, the ID number for just reading its ID number and being stored in host is compared；At this time, it may be necessary to IIC
Device carries out read operation, and read operation process is as shown in Figure 7；
If IIC device itself is without ID number, some numerical value just is written to some address of its inside or register,
Then the value in the address or register is read again, and the two is compared；At this time, it may be necessary to first be carried out to IIC device shown in fig. 6
Write operation, then carry out read operation shown in Fig. 7.
From Fig. 6 and Fig. 7 it is found that such detection method needs being written and read to IIC device for continuous several times, especially
" some numerical value is written to some register or address, then reads the method compared ", needs first to carry out the operation of Fig. 6, then again
The operation for carrying out Fig. 7, operates unusual very complicated.
Also, in the case where IIC device is not present, after needing multiple waiting-timeout, entire detection could be completed
Process is to waste a large amount of time, has greatly delayed the detection speed of IIC device.
In addition, Fig. 7 and read-write process shown in fig. 6 are a most basic operating process, for the equipment of IIC device
Address size is 10bit (i.e. 10 bits), and since the address format of iic bus must be 8 bit lengths, host is issued
The operation of device address will be completed in two steps, and every step requires to wait the operation of answer signal or time-out again；For being posted in equipment
Storage or address are 16bit, and the operation that host issues register or address in equipment will also be completed in two steps, and every step requires
Wait the operation of answer signal or time-out；It is 16bit for register in equipment or the data in address, host is posted to this
It when storage or address are written and read, to be also carried out in two steps, every step requires to wait answer signal.Or even some
IIC device needs other more complicated operations, could complete entire detection process.
Also, the method whether existing detection IIC interface device connects, since its detection speed is slow, poor universality,
Application scenarios are just greatly limited, and are usually only used in equipment or system just powers on when carries out one to IIC device
Secondary detection is not suitable for being measured in real time IIC device.Because there is the IIC device of ID number, need host to the multiple behaviour of slave
After work, its ID number could be read, and for the IIC device of not ID number, it needs to its some internal address or register
Some numerical value is written, then reads the method compared again and is detected, and after equipment or system behave, IIC device is
It is configured and finishes, it, may be to configured if some numerical value being written to its some internal address or register
IIC device impacts, this, which just needs first to read the numerical value in the present address or register, saves, after detection, then
It writes back, is so even more a cumbersome process, therefore the method whether existing detection IIC interface device connects, be not suitable for IIC
Device is measured in real time.
And to the real-time detection of IIC device, be very important sometimes, as shown in Figure 1, device B be by winding displacement and
CPU connection, connection is firm when equipment or system just power on, but inevitably will appear contact in use
Bad situation if can detect that its connection there is a problem at this time, and handles problem in time, that is probably
It can avoid the generation of bigger problem.And the device A for being welded on circuit board I, due in equipment or system operation
The cisco unity malfunction due to Pad off, device aging etc., and it is one in equipment or system most important
Device if its problem can be detected in time will be very valuable.
IIC serial bus protocol provides, must follow the response bits (response behind each byte transmitted
Position is that one end of reception signal issues, referred to slave).If not receiving the answer signal of slave in a period of time,
It automatically considers slave and is correctly received data ".Why iic bus agreement does regulation so, is in order to avoid " host "
The case where waiting " answer signal " always, and cannot jumping out appearance.
Compared with prior art, in the method that whether detection IIC interface device of the invention connects, firstly, host is in IIC
Initial signal is issued in bus；Then, host issues the device address of slave on iic bus；The bus protocol of IIC interface is advised
It is fixed: " must be followed behind each byte transmitted one ' response bits ' ", accordingly it is found that slave is receiving host sending
Device address signal after, an answer signal can be issued；If host receives the answer signal of slave, then it represents that host with from
Otherwise machine successful connection indicates that host and slave are not connected with successfully that (including no slave, slave such as are not connected firmly at a variety of feelings
Condition)；After detection, termination detection process.
The method whether detection IIC interface device of the invention connects does not need to be written and read IIC device, not yet
Need multiple waiting-timeout, it is only necessary to which simple four step can be achieved with the purpose of detection, and detection speed is fast；
As long as the device of IIC interface, regardless of its type can be transferred through this regardless of it is either with or without the ID number of itself
Method detection, versatility are good；
The method whether detection IIC interface device of the invention connects do not need to the address of IIC device or register into
Row operation, no matter therefore IIC device configured and finished, IIC device will not all be impacted, not need first by address or to post
Numerical value in storage, which is read, to be saved, and after detection, is written back, therefore can be measured in real time at any time to IIC device,
Application scenarios are extensive and real-time is good.
When detecting answer signal, the prior art be the 9th clock cycle of SCL high level some when
Between point detection SDA signal line on signal, judged whether to have received answer signal according to testing result this time, still
In fact, whether the answer signal on SDA signal line occurs, in the high level and the 9th clock of the 8th clock cycle of SCL
Low level between the high level in period has emerged from, as shown in Figure 4.
The prior art has greatly delayed the service speed to IIC device to the detection mode of answer signal, because SCL believes
Clock cycle on number line is that dynamic is adjustable in a certain range, if answer signal can be detected in advance, so that it may
Shorten the time of the 9th clock cycle on SCL signal line in certain range.So if can be shortened on SCL signal line the 9th
If clock cycle (i.e. answer signal period), the detection speed to IIC device will be improved on the whole.
Therefore, judging whether the answer signal (step S103) for receiving slave at the appointed time can also include:
Step S1031: slave is detected between the high level and the high level of the 9th clock cycle of the 8th clock cycle
Answer signal, detection number be at least once.
As shown in figure 5, the high level of 8th clock cycle of the present invention on SCL signal line and the 9th clock cycle
Answer signal is detected at low level between high level, it is preferred that three can be divided since this low level center
(or five) time point detects the signal on SDA signal line, can know whether answer signal in advance, and improve detection and answer
Answer the accuracy of signal.
Further, further includes:
Step S1032: if detecting the answer signal of slave, shorten the time of the 9th clock cycle；Shorten the 9th
The time of clock cycle improves detection speed.
As a kind of improvement for the method whether present invention detection IIC interface device connects, when connecting failed, repetition
It executes and issues initial signal (step S101), issue the device address (step S102) of slave and judge whether at the appointed time
Receive the certain number of answer signal (step S103) of slave.
When testing result is to connect failed, in order to keep testing result more accurate, host is needed to issue starting again
The device address of signal and slave, and judge whether that the answer signal for receiving slave at the appointed time (repeats to hold again
Row step S101, S102 and step S103), it is so repeated several times, after the answer signal for not receiving slave, just determines connection
Not successfully, it can be improved the accuracy rate of testing result in this way.
It, as shown in Figure 10, can be with as another the improving of the method that whether connects of present invention detection IIC interface device
Include:
Step S105: connection result is subjected to output display and/or warning note.Result is exported and is shown, is dodged by LED
The mode that bright, buzzer warning or LCD are shown prompts failure, for analyzing and determining.
On the other hand, the present invention provides a kind of (detection described herein of device 1 whether detection IIC interface device connects
The device whether IIC interface device connects is host above-mentioned, similarly hereinafter), as shown in figure 11, comprising:
First issues module 11, for issuing initial signal；
Second issues module 12, for issuing the device address of slave；
First judgment module 13, the answer signal for judging whether to receive slave at the appointed time, if it is,
Successful connection is indicated, otherwise, it means that connection is failed；
Third issues module 14, for issuing termination signal.
Corresponding with the above method, the device whether detection IIC interface device of the invention connects is not needed to IIC device
It is written and read, does not also need multiple waiting-timeout, it is only necessary to which simple four step can be achieved with the purpose of detection, detect speed
Fastly；
As long as the device of IIC interface, regardless of its type can be transferred through this regardless of it is either with or without the ID number of itself
Device detection, versatility are good；
The device whether detection IIC interface device of the invention connects do not need to the address of IIC device or register into
Row operation, no matter therefore IIC device configured and finished, IIC device will not all be impacted, not need first by address or to post
Numerical value in storage, which is read, to be saved, and after detection, is written back, therefore can be measured in real time at any time to IIC device,
Application scenarios are extensive and real-time is good.
As shown in figure 12, above-mentioned first judgment module 13 includes:
Detection unit 131, for being examined between the high level and the high level of the 9th clock cycle of the 8th clock cycle
The answer signal of slave is surveyed, detection number is at least once.
The high level and the high level of the 9th clock cycle of 8th clock cycle of the detection unit on SCL signal line it
Between low level at detect answer signal, can know whether answer signal in advance, and improve detection answer signal standard
True property.
Further, further includes:
Adjustment unit 132, if shortening the time of the 9th clock cycle for detecting the answer signal of slave.Adjustment
Unit shortens the time of the 9th clock cycle, improves detection speed.
As a kind of improvement for the device whether present invention detection IIC interface device connects, when connecting failed, repetition
It executes first and issues module 11, second issues module 12 and the certain number of first judgment module 13.
When testing result is to connect failed, in order to keep testing result more accurate, host is needed to issue starting again
The device address of signal and slave, and judge whether that the answer signal for receiving slave at the appointed time (repeats to hold again
Row first issues module 11, and second issues module 12 and first judgment module 13), it is so repeated several times, does not receive slave
Answer signal after, just determine that connection is failed, can be improved the accuracy rate of testing result in this way.
The another of device whether connected as present invention detection IIC interface device improves, and as shown in figure 13, also wraps
It includes:
Display module 15 is exported, for connection result to be carried out output display and/or warning note.Result output is aobvious
Show, for analyzing and determining.
In another aspect, the present invention also provides a kind of systems whether detection IIC interface device connects, and as shown in figure 14, packet
Include the device 1 whether above-mentioned detection IIC interface device connects, and the device connection 1 whether connecting with detection IIC interface device
At least one IIC device 2 (slave) of (host).
Corresponding with the above method and device, the present invention detects in the system whether IIC interface device connects, firstly, main
Machine issues initial signal on iic bus；Then, host issues the device address of slave on iic bus；IIC interface it is total
Wire protocol provides: " must be followed behind each byte transmitted one ' response bits ' ", accordingly it is found that slave is receiving
After the device address signal that host issues, an answer signal can be issued；If host judgement receives the answer signal of slave,
It then indicates host and slave successful connection, otherwise, indicates that host and slave be not connected with successfully that (including no slave, slave connect
A variety of situations such as insecure.)；After detection, termination detection process.What whether detection IIC interface device of the invention connected
System detection speed is fast, it is only necessary to which simple four operations can be achieved with the purpose of detection；Versatility is good, as long as IIC interface
Device regardless of it is either with or without the ID number of itself, can be transferred through present apparatus detection regardless of its type.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of method whether detection IIC interface device connects characterized by comprising
Issue initial signal；
Issue the device address of slave；
Judge whether the answer signal for receiving slave at the appointed time, if it is, successful connection is indicated, conversely, then table
Show that connection is failed；
Issue termination signal；
It is described to judge whether that the answer signal for receiving slave at the appointed time includes:
The response of low level detection slave between the high level and the high level of the 9th clock cycle of the 8th clock cycle
Signal, wherein since the low level center, point three or five time points detection answer signals；
The method also includes:
If detecting the answer signal of slave, shorten the time of the 9th clock cycle.
2. the method that whether connects of detection IIC interface device according to claim 1, which is characterized in that when connection not at
When function, the sending initial signal is repeated, the device address for issuing slave and described judge whether in the stipulated time
Inside receive the certain number of answer signal of slave.
3. the method whether detection IIC interface device according to claim 2 connects, which is characterized in that further include:
Connection result is subjected to output display and/or warning note.
4. a kind of device whether detection IIC interface device connects characterized by comprising
First issues module, for issuing initial signal；
Second issues module, for issuing the device address of slave；
First judgment module, the answer signal for judging whether to receive slave at the appointed time, if it is, the company of expression
It is connected into function, otherwise, it means that connection is failed；
Third issues module, for issuing termination signal；
The first judgment module includes:
Detection unit, for the low level inspection between the high level and the high level of the 9th clock cycle of the 8th clock cycle
Survey the answer signal of slave, wherein since the low level center, point three or five time point detection response letters
Number；
Described device further include:
Adjustment unit, if shortening the time of the 9th clock cycle for detecting the answer signal of slave.
5. the device whether detection IIC interface device according to claim 4 connects, which is characterized in that further include:
Display module is exported, for connection result to be carried out output display and/or warning note.
6. a kind of system whether detection IIC interface device connects, which is characterized in that including detection described in claim 4 or 5
The device whether IIC interface device connects, and at least the one of the device connection whether IIC interface device connect is detected with described
A IIC device.
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| CN106502167A (en) * | 2016-12-19 | 2017-03-15 | 郑州云海信息技术有限公司 | I is based in a kind of server2The temperature acquisition structure of C buses and method |
| CN109871342B (en) * | 2017-12-05 | 2024-02-09 | 炬芯科技股份有限公司 | Self-adaptive connection serial interface circuit and self-adaptive connection method thereof |
| CN109871344B (en) * | 2017-12-05 | 2021-08-31 | 炬芯科技股份有限公司 | Communication system, interface circuit and signal transmission method thereof |
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| CN102316356A (en) * | 2011-06-27 | 2012-01-11 | 深圳Tcl新技术有限公司 | Device and method for testing HDMI (high-definition multimedia interface) function of television (TV) |
| CN102288849A (en) * | 2011-06-29 | 2011-12-21 | 上海工业自动化仪表研究院 | Highway addressable remote transducer (HART) loop fault diagnosis instrument and method |
| CN102968351A (en) * | 2012-12-13 | 2013-03-13 | 中国航空无线电电子研究所 | External control method for BIT parameters |
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