CN109992534A - A kind of method and system of online fast search single wire device sequence number - Google Patents
A kind of method and system of online fast search single wire device sequence number Download PDFInfo
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- CN109992534A CN109992534A CN201910220559.8A CN201910220559A CN109992534A CN 109992534 A CN109992534 A CN 109992534A CN 201910220559 A CN201910220559 A CN 201910220559A CN 109992534 A CN109992534 A CN 109992534A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test buses, lines or interfaces, e.g. stuck-at or open line faults
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/10—Program control for peripheral devices
- G06F13/12—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor
- G06F13/124—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware is a sequential transfer control unit, e.g. microprocessor, peripheral processor or state-machine
- G06F13/126—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware is a sequential transfer control unit, e.g. microprocessor, peripheral processor or state-machine and has means for transferring I/O instructions and statuses between control unit and main processor
Abstract
The invention discloses a kind of method and system of online fast search single wire device sequence number, during the test, by generating a formal code, successively it is sent to bus, to obtain the sequence number of a device, formal code is exactly obtained sequence number, and while generating formal code, also generate a prepared code, preparation code is not the sequence number of device, but it can instruct the generation of next formal code, thus host only needs whole devices in the i.e. recognizable bus of few number, it is not required to carry out additional test i.e. to bus to can determine whether that search finishes, and sequence number can be automatically generated in search process, it is used for host, it artificially need not separately input, it thus can largely reduce the workload of manufacture and maintenance, practicability is high.
Description
Technical field
The present invention relates to single bus device networking application field more particularly to a kind of online fast search single wire device sequences
The method and system of row number.
Background technique
Single line (1-Wire) device is the product of American Dallas semiconductor company.It is realized mutually based on a signal wire
It is connected to the serial integrated circuit of letter.Single wire device is easily achieved the automation controls such as industry spot temperature acquisition, digital output modul
Net.By 2011, single wire device was more than 30 kinds existing, including DS1820 (temperature sensor), DS2405 (switch), DS2450
(A/D converter) etc..Single bus is a kind of simple handshake mode, it is between host and peripheral components by one
Route carries out two-way communication.All single bus devices have a common feature: each device has when leaving the factory
One with 64 2 system sequence numbers of the mutual unduplicated fixation of other any devices.That is, each device is unique
's.This allows for can choose out any one device in numerous devices for being connected to same bus.Once the sequence number of device
It is known that any device all can be selected uniquely for communicating by access sequence number.Single bus communication has route letter
The advantages that list, hardware spending are few, low in cost, convenient for extension and maintenance, is widely used to every field.
It is briefly described so that temperature measures as an example, the methods of temperature detecting resistance or single wire device, thermometric electricity can be used in temperature measurement
The resistance value of resistance varies with temperature, and corresponding temperature can be obtained by surveying its resistance value, but measures resistance value and need circuit kit, but
When there are many measurement point, then need more set circuits and a large amount of lines, overall structure extremely complex.Using single wire device DS1820, it
Front-end digital is completed, and multi-point temperature measurement can be realized with 3 lines, structure is simple, and temperature measurement accuracy is high, easy to connect, dimension
Shield is convenient.
When using single wire device networking, host needs to be communicated with the device of assigned serial number.The sequence number of device can
To be obtained by off-line test.In document 1, " the multi-point temperature supervising and controlling being made of single-chip microcontroller and multi-disc DS1820 is " external
Electronic component " the 1st phase in 2001, it wears in the " such as Rong, the method for off-line test is to hang DS1820 used with host one by one
It connects, to read its sequence number.After detecting sequence number, need for sequence number to be artificially input in application system.This is caused
It in production and use process, needs additionally to test, and safeguards inconvenience.It is online that Search ROM instruction can also be used in the sequence number of device
Test.But if identified using simple detection method by turn, the number for needing to detect is 264.According to device property,
Every detection is primary to need 13 milliseconds, then all detection needs 7,600,000,000 years, this is infeasible, thus needs to find quickly detection side
Method.
Summary of the invention
The technical problems to be solved by the present invention are: providing, a kind of search efficiency is high and logical operation is simple online quick
Search for the method and system of single wire device sequence number.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of method of online fast search single wire device sequence number, includes the following steps,
Step 1, host send Search ROM order；
Step 2, all single wire devices receive the data sent on its sequence number after order and read for host, according to
Single wire device search protocol, host first read the primary data of sequence number of all single wire devices, obtain primary differentiation
Code；
Step 3, host invocation bit processing subroutine generate the according to primary discrimination code and position processing subroutine
One formal code, and primary prepared code is generated according to position processing subroutine；
Step 4, host carry out selecting for sequence number according to first formal code of generation, pick out with first formally
The sequence number of the identical several single wire devices of code；
Step 5, host continue to repeat step 2 to four process, obtain next bit in remaining several single wire devices
Formal code and preparation code until completing all reading data and generating process of wheel, then obtain so on circulate
One group of formal code and preparation code, this organizes the sequence number that formal code is one of single wire device；
Step 6, host save one group of formal code and preparation code, and continue to repeat the process of step 1 to five, and raw
At the sequence number of remaining single wire device, the sequence number of all single wire devices is then searched.
Preferably, before calling institute's rheme processing subroutine, one group of prepared code is first generated by host in the step 3,
Its numerical value prepared in code bit is disposed as 0.
Preferably, the formal code generating method is, to each in coding, successively to proceed as follows: if
The discrimination code that host receives is " 01 ", then the formal code of this is 0；If the discrimination code that host receives is " 10 ", should
The formal code of position is 1；If the discrimination code that host receives is " 00 ", the preparation code of corresponding position is checked, if preparation code is 0,
Then the formal code of this is 0；If preparation code is 1, the formal code of this is 1, the data on complete all positions to be found generate
The sequence number of one formal code namely a certain single wire device.
Preferably, the prepared code generating method is, to each in coding, successively to proceed as follows: if
The discrimination code that host receives is " 01 ", then the preparation code of this is 0；If the discrimination code that host receives is " 10 ", the position
Preparation code be 0；If the discrimination code that host receives is " 00 ", the existing prepared code of corresponding position is checked, if existing preparation
Code is 0, then the preparation code of this is changed to 1, and by all before this preparation codes, is changed to the formal code of corresponding position, if
Existing preparation code is 1, then the preparation code of this is changed to 0.
Preferably, the election process of the sequence number is that host generates one formally in corresponding position in the step 4
Code data after, all single wire devices in bus read the data, if the present bit of its sequence number generated with host it is formal
Code data are identical, and the sequence number of this single wire device continues to hang in bus, and waiting is selected；If present bit and the master of its sequence number
The formal code data that machine generates are different, this sequence number exits bus communication, no longer data sent to bus, until host is sent out again
Reset pulse is sent to be waken up.
Preferably, the judgment criteria that the search process of all single wire device sequence numbers is completed is institute in the step 6
There are all positions all 0 of prepared code.
In order to achieve the above object, the invention also discloses a kind of systems of online fast search single wire device sequence number, including
Memory, processor and storage are on a memory and the computer program that can run on a processor, which is characterized in that described
Processor realizes the step in any the method for the claims 1 to 7 when executing the computer program.
Compared with prior art, usefulness of the present invention is: the side of the online fast search single wire device sequence number
Method and system, host is every to send a data to bus, and the sequence number of an online device can be obtained, thus host only needs pole
Few number is the whole devices that can recognize in bus, is not required to carry out additional test to bus to can determine whether to have searched for
Finish, and sequence number can be automatically generated in search process, is used for host, it is not necessary to artificially separately input, thus can be largely
Reduce the workload of manufacture and maintenance, practicability is high.
Detailed description of the invention
The following further describes the present invention with reference to the drawings:
Fig. 1 is to look for the flow diagram of a single bus device serial number；
Fig. 2 is to look for the flow diagram of all single bus device serial numbers；
Fig. 3 is the processing flow schematic diagram of a processing subroutine.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses:
A kind of method of online fast search single wire device sequence number, the course of work and working principle of single wire device
The working principle of single wire device in bibliography 2 " DALLAS company semiconductor handbook .1996 ", in the present embodiment, such as Fig. 1
To shown in Fig. 3, for searching for 64 bit sequence numbers, sequence number digit is set as n, n value range is 0-63, then described
Searching method includes the following steps,
Step 1, host send reset pulse to bus network, and then there are pulses for reading, then search to bus network transmission
Rope ROM order；
Step 2, all single wire devices are after receiving the Search ROM order of host, according to search protocol, by it
Corresponding sequence number successively sends the true form and radix-minus-one complement of present bit from a high position to low level, if the true form of present bit is " 1 ", then instead
Code is " 0 ", and if true form is " 0 ", radix-minus-one complement is " 1 ", and the true form and radix-minus-one complement of each position send out in two times, all single line devices
The true form and radix-minus-one complement of part are read after " line with " logical operation for host；Host is successively read the sequence of all single wire devices by turn
Row number corresponding all data on each after every reading a data, are identified according to the data of reading and self-defining data
Rule obtains a discrimination code, and in practical applications, host starts first read on sequence number first of all single wire devices
Data, then obtain primary discrimination code；
Step 3, host invocation bit processing subroutine generate the according to primary discrimination code and position processing subroutine
One formal code, and primary prepared code is generated according to position processing subroutine, in this actual application, if discrimination code
For a, the self-defining data recognition rule is set as, and first sets a as any one in " 00 ", " 01 ", " 10 ", " 11 ", if sentencing
Other code is " 00 ", then it represents that has single wire device to be connected to, in this data bit, their value is clashed, that is, all single lines
For the sequence number of device in this data bit, value thereon is existing " 1 ", also there is " 0 ", thus shows as value and clash；If differentiating
Code is " 01 ", then it represents that there is device to be connected to, in this data bit, their value is 0, similarly, the sequence of all single wire devices
Row number in this data bit, thereon all be " 0 "；If discrimination code is " 10 ", then it represents that there is device to be connected to, in this data bit
On, their value is 1, and similarly, for the sequence number of all single wire devices in this data bit, value thereon is all " 1 "；If differentiating
Code is " 11 ", then it represents that is connected without device with single bus device；
In addition, first generating one group of prepared code by host before calling institute's rheme processing subroutine, the number in code bit is prepared
Value is disposed as 0, and in processing subroutine in place, as shown in Figure 1, setting x (n) as formal code, y (n) is preparation code, and the value of n is 0
To 63.Institute's rheme processing subroutine includes that formal code generates program and preparation code generation program, wherein the formal code generates
The generating process of program is, to each in coding, successively to proceed as follows: if the discrimination code a that host receives is
" 01 ", then the formal code x (n) of this is 0；If the discrimination code a that host receives is " 10 ", the formal code x (n) of this is
1；If the discrimination code a that host receives is " 00 ", the preparation code for further checking corresponding position is needed, if preparation code y (n) is 0,
Then the formal code x (n) of this is 0；If preparation code y (n) is 1, the formal code x (n) of this is 1, on complete all positions to be found
Data, that is, generate the sequence number of a formal code namely a certain online device；The ready mode code generates the generation of program
Cheng Wei successively proceeds as follows each in coding: if the discrimination code a that host receives is " 01 ", this 's
Preparation code y (n) is 0.If the discrimination code a that host receives is " 10 ", the preparation code y (n) of this is 0.If host receives
The discrimination code a arrived is " 00 ", then needs the existing prepared code for further checking corresponding position, if existing preparation code is 0, by this 's
Y (n) preparation code is changed to 1, and by all before this preparation code y (n-1), is changed to the formal code x (t) of corresponding position, wherein t
The preparation code y (n) of this is changed to 0 if existing preparation code is 1 by=0,1,2 ... n-1.
Step 4, host carry out selecting for sequence number according to first of generation formal code data, pick out first with
The sequence numbers of the identical several single wire devices of first formal code data generated, the sequence number is selected in practical applications
Process is that, when host is after corresponding position generates first formal code data, all single wire devices in bus read the data, such as
The present bit of its sequence number of fruit is identical as first formal code data that host generates, and the sequence number of this single wire device will continue to hang
In bus, waiting is further selected；If the correspondence position of its sequence number is different from first formal code data that host generates,
This sequence number exits bus communication, no longer sends data to bus, is waken up until host sends reset pulse again, because
And largely improve the data screening efficiency of serial number present bit；
Step 5, host continue to repeat step 2 to four process in remaining several single wire devices, obtain next bit
Formal code and preparation code, until complete all reading data and generating process of wheel, then obtain one group of formal code with
Preparation code, this organizes the sequence number that formal code is one of single wire device；
Step 6, host save one group of formal code and preparation code, and continue to repeat the process of step 1 to five, and raw
At the sequence number of remaining single wire device, the sequence number of all single wire devices is then searched, when all single wire device sequence numbers
After the completion of search process, all positions all 0 of preparation code, as shown in Fig. 2, set preliminary preparatory code as y (t)=0, the value of t
It is 0 to 63, then invocation bit processing subroutine, searches single wire device sequence number, in the sequence number for finding out a single wire device
Later, when y (t) is not all 0, continue to return to search program, search the sequence number of next single wire device, and so on follow
Ring, until when y (t) is all 0, the search search procedure of end sequence number.
In order to achieve the above object, the invention also discloses a kind of systems of online fast search single wire device sequence number, including
Memory, processor and storage on a memory and the computer program that can run on a processor, the processor execution
The arbitrary steps in the above method are realized when the computer program.
It is illustrated below with reference to concrete application embodiment, in embodiment, to mount 6 12 bit sequences on single bus
Number single wire device for, to illustrate search process of the invention.
As shown in table 1, the sequence number of 6 single bus devices A, B, C, D, E, F are given in table, digit is 12
Position, in the present invention, the application of the technical solution are not limited to 12 bit sequence numbers, equally suitable for the sequence number of other digits
With.
After search process starts, host sends reset pulse, and there are pulses for reading, then sends Search ROM to bus network
Order, after 6 single bus devices receive the Search ROM order of host transmission, by being in bit address 1 on its sequence number
All data be sent to host, in the process, data are sent in two times, for the first time send, 6 single bus devices by its
The true form of all values on sequence number in bit address 1 is sent to host, and second of transmission, 6 single bus devices will
The radix-minus-one complement of all values on its sequence number in bit address 1 is sent to host, and host reads the data of transmission in two times, by
In in the present embodiment, the serial number bits of 6 single bus devices is in true form and the radix-minus-one complement not phase of all values in bit address 1
Together, value " 1 " and value " 0 " exist, thus according to self-defining data recognition rule, the discrimination code that host receives is " 00 ",
Preparation code is set to 0 first by then invocation bit processing subroutine entirely, and since pre-set prepared code is in bit address 1
Value is " 0 ", thus, according to the generating process of code formal in the processing subroutine of position, in first time reading process, host is in place
The data generated on location 1 are " 0 ", also the formal code as in bit address 1, further according to the generating process of preparation code, due to preset
Preparation code be 0, thus in first time reading process, the preparation code in bit address 1 is 1, in this way, then generating in bit address 1
Formal code and preparation code carry out the election process of sequence number thereafter, since the value in bit address 1 is 0, thus according to sequence
Number selection method, due in the sequence number of single bus device E, F be in bit address 1 on value be 1, with the life of corresponding position
It is not identical at data, thus, single bus device can exit bus communication, no longer to bus send data, until host again
Secondary transmission reset pulse is waken up, and host then will continue to read the sequence number in remaining A, B, C, D in bit address 2
All data, including true form and radix-minus-one complement, similarly, remaining single bus device A, B, C, D can be by being on its sequence number
All data in bit address 2 are sent to host, and in the process, data are sent in two times, send for the first time, and 4 single lines are total
The true form for all values being in bit address 2 on its sequence number is sent to host by line device part, second of transmission, 4 single lines
The radix-minus-one complement for all values being in bit address 2 on its sequence number is sent to host by bus device, and host reads hair in two times
Mode in the data sent, reading process and data generating mode bit address 1 as above is identical, then obtains bit address 2
In formal code and preparation code, and so on and by turn generate data, until 12-bit data all read and generate and finish, after
And the reading and generating process of first round data are completed, in the process, one group 12 formal codes and preparation code are formd,
This organizes the sequence number that formal code is wherein single bus device A, also as the smallest sequence number, and under this group preparation code is then
The reference preparation code of one wheel reading data.
In the reading data and generating process of the first round, when reading to bit address 3, due to single bus device C, D
Sequence number to correspond to position upper value be 1, it is not identical as the corresponding position data generated, thus after the reading of bit address 3 has generated,
Single bus device C, D can exit bus communication, no longer to bus send data, until host send again reset pulse by its
It wakes up, is 1 since the sequence number of single bus device B correspond to position upper value when reading value bit address 12 similarly, and it is corresponding
The data that position generates are not identical, thus after the reading of bit address 12 has generated, single bus device B can exit bus communication,
Data no longer are sent to bus, are waken up until host sends reset pulse again.
Mode is selected according to the method and sequence number of above-mentioned host reading data and generation data, carries out 5 wheel of remainder
Reading data and generating process, then obtain the sequence number of remaining 5 single bus devices, wherein the list that host is read
The sequence of wire bus device is A, B, D, C, F, E, and sequence number value is sequentially increased.
By 6 wheel operations, the sequence number of 6 devices is produced, it is identical as known sequence number.After 6 wheel search, preparation code
All become 0 again, shows that search terminates.
The following table 1 is the search process of sequence number:
Table 1
It is emphasized that: the above is only presently preferred embodiments of the present invention, not make in any form to the present invention
Limitation, any simple modification, equivalent change and modification to the above embodiments according to the technical essence of the invention,
All of which are still within the scope of the technical scheme of the invention.
Claims (7)
1. a kind of method of online fast search single wire device sequence number, it is characterised in that: include the following steps,
Step 1, host send Search ROM order；
Step 2, all single wire devices receive the data sent on its sequence number after order and read for host, according to single line
Device search protocol, host first read the primary data of sequence number of all single wire devices, obtain primary discrimination code；
Step 3, host invocation bit processing subroutine generate first according to primary discrimination code and position processing subroutine
Formal code, and primary prepared code is generated according to position processing subroutine；
Step 4, host carry out selecting for sequence number according to first formal code of generation, pick out and first formal code phase
The sequence number of same several single wire devices；
Step 5, host continue the process for repeating step 2 to four, are obtaining next bit just in remaining several single wire devices
Formula code and preparation code until completing the reading data and generating process of all an of wheel, then obtain one group so on circulate
Formal code and preparation code, this organizes the sequence number that formal code is one of single wire device；
Step 6, host save one group of formal code and preparation code, and continue to repeat the process of step 1 to five, and more than generation
The sequence number of lower single wire device, then searches the sequence number of all single wire devices.
2. a kind of method of online fast search single wire device sequence number according to claim 1, it is characterised in that: described
In step 3, before calling institute's rheme processing subroutine, one group of prepared code is first generated by host, the numerical value prepared in code bit is all provided with
It is set to 0.
3. a kind of method of online fast search single wire device sequence number according to claim 1, it is characterised in that: described
Formal code generating method is, to each in coding, successively to proceed as follows: if the discrimination code that host receives is
" 01 ", then the formal code of this is 0；If the discrimination code that host receives is " 10 ", the formal code of this is 1；If main
The discrimination code that machine receives is " 00 ", then checks the preparation code of corresponding position, if preparation code is 0, the formal code of this is 0；If
Preparation code is 1, then the formal code of this is 1, the data on complete all positions to be found, that is, generates a formal code namely a certain
The sequence number of single wire device.
4. a kind of method of online fast search single wire device sequence number according to claim 1, it is characterised in that: described
Preparation code generating method is, to each in coding, successively to proceed as follows: if the discrimination code that host receives is
" 01 ", then the preparation code of this is 0；If the discrimination code that host receives is " 10 ", the preparation code of this is 0；If host
The discrimination code received is " 00 ", then checks the existing prepared code of corresponding position, if existing preparation code is 0, by the preparation of this
Code is changed to 1, and by all before this preparation codes, is changed to the formal code of corresponding position, should if existing preparation code is 1
The preparation code of position is changed to 0.
5. a kind of method of online fast search single wire device sequence number according to claim 1, it is characterised in that: described
In step 4, the election process of the sequence number is, all in bus after host generates a formal code data in corresponding position
Single wire device reads the data, if the present bit of its sequence number is identical as the formal code data that host generates, this single wire device
Sequence number continue to hang in bus, waiting is selected；If the formal code data that the present bit of its sequence number and host generate are not
Together, this sequence number exits bus communication, no longer sends data to bus, is waken up until host sends reset pulse again.
6. a kind of method of online fast search single wire device sequence number according to claim 1, it is characterised in that: described
In step 6, the judgment criteria that the search process of all single wire device sequence numbers is completed is that all positions of all prepared codes are all
0。
7. a kind of system of online fast search single wire device sequence number, it is characterised in that: including memory, processor and deposit
Store up the computer program that can be run on a memory and on a processor, which is characterized in that the processor executes the calculating
The step in any the method for the claims 1 to 7 is realized when machine program.
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