CN105045743B - A kind of multi protocol conversion method for possessing priority scheduling - Google Patents

A kind of multi protocol conversion method for possessing priority scheduling Download PDF

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Publication number
CN105045743B
CN105045743B CN201510444017.0A CN201510444017A CN105045743B CN 105045743 B CN105045743 B CN 105045743B CN 201510444017 A CN201510444017 A CN 201510444017A CN 105045743 B CN105045743 B CN 105045743B
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byte
arbitration
protocol conversion
agreement
carry out
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CN105045743A (en
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关新平
孙彦龙
袁亚洲
马巨海
张宇
李雨纯
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Yanshan University
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Yanshan University
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/382Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices

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  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

A kind of multi protocol conversion method for possessing priority scheduling, system set an arbitration byte and an arbitration byte renewal timer in initial phase;Arbitration byte renewal timer is updated to the every information for arbitrating byte, whether there is protocol conversion requirement in detecting system;After system initialization terminates, every information of detection arbitration byte, the protocol conversion in system is monitored and indicated according to from the superlative degree to the order of lowermost level by arbitrating byte, conversion is scheduled according to the priority of different agreement translation type, after converting, operation is zeroed out to the position that byte is arbitrated corresponding to the agreement, then system detects every information since the highest order of arbitration byte by high-low-position again.The present invention has the advantages that design is simple, processing is accurate, is widely used.

Description

A kind of multi protocol conversion method for possessing priority scheduling
Technical field
The present invention relates to a kind of communication technical field, especially a kind of multi protocol conversion method with priority scheduling.
Background technology
At this stage, the communication protocol that data transfer can use have it is a variety of, using a variety of logical in an embedded system Believe agreement transmission data in the case of, in order to make data in system real-time Transmission, it is necessary to carry out various types of agreements Conversion.
Because the time that various data arrive in embedded system has uncertainty, cause various types of protocol conversions It is required that the time carried out also has uncertainty.Simultaneously as the importance of different pieces of information is different, cause different types of agreement The priority of conversion is different, so needing a kind of simple and easy method, can detect and indicate in time what requirement was carried out Protocol conversion, and be scheduled according to the priority of different agreement translation type, ensure the high protocol conversion total energy of priority Carry out in time, avoid the transmission delay of significant data.
The content of the invention
Present invention aims at provide a kind of advantages of simple, the more associations for possessing priority scheduling suitable for embedded system Discuss conversion method.
To achieve the above object, it is as follows using the inventive method:
In embedded systems, the embedded system is made up of hardware and software, and hardware is by embedding for the conversion method operation Enter microsever, memory, generalized device interface, power supply composition, generalized device interface has serial communication interface, Ethernet to connect Mouth, USB, I2C interface, SPI interface and other interfaces, distinct interface are transmitted using different communication protocol Data;Running software is controlled in embedded microprocessor to whole system;
Embedded system initializes, and defines an arbitration byte in system initialisation phase and an arbitration byte renewal is fixed When device be system protocol conversion use, described arbitration byte occupancy one byte memory headroom, wherein the byte each A kind of protocol conversion type is represented, each protocol conversion type priority level represented from high to low of byte reduces successively, Highest order represents the protocol conversion type of highest priority;Wherein, a certain position for arbitrating byte is 1, and representative has corresponding to the position Protocol conversion needs to carry out or carry out;The a certain position for arbitrating byte is 0, and represent needs without protocol conversion corresponding to the position Carry out;
The arbitration byte renewal timer is a timer internal in embedded microprocessor, fixed by setting this When device register, the timer can be with the time interval circulation timing of needs;
After the completion of system initialization, monitoring is timed to total interface using byte renewal timer is arbitrated, it is determined that being It is no to there is protocol conversion to need to carry out or carry out, the every information for arbitrating byte is updated according to snoop results;Then System is scheduled according to protocol conversion of the arbitration byte information to different priorities;After the completion of some protocol conversion, system Operation is zeroed out to the position that byte is arbitrated corresponding to the agreement, after having performed clear operation, system is again from arbitration byte Highest order starts to detect every information by high-low-position.
Whether the method for being 1 is a certain position of system detectio arbitration byte:System generates a byte first, is defined as detecting Byte, described detection byte are made up of 8 bits, the correspondence position of this detecting position of the detection byte with arbitration byte For 1, other positions 0;By detecting byte and the progress of arbitration byte and computing, if operation result is 1, arbitration byte is represented The position is 1, and the protocol conversion representated by this of arbitration byte requires to carry out or carry out;If operation result is 0, represent It is 0 to arbitrate the byte position, and the protocol conversion representated by this of arbitration byte does not require to carry out;Highest of the system from arbitration byte Position starts, each using operation result detection with computing of the detection byte with arbitrating byte according to the order from a high position to low level Position information.
System is after protocol conversion corresponding to a certain position in performing arbitration byte, and system corresponding to the agreement to arbitrating byte Position be zeroed out operation, the method for clear operation is:Arbitrate byte detection byte corresponding with the position and carry out XOR, and Operation result is assigned to arbitration byte, the position 0 that this in byte detects is arbitrated, before other are still clear operation Value.
System perform non-limit priority protocol conversion perform before, system need to by judge one confirm byte and Whether arbitrate byte is 0 with the operation result of computing, is confirmed whether to have the protocol conversion requirement of higher priority to carry out.
The protocol conversion requirement for having higher priority before the corresponding protocol conversion of this is performed for anti-locking system is carried out, Need to carry out arbitration byte confirmation operation, system confirm that the method for operation is to arbitration byte expense highest order:It is first System one byte of generation, the byte is defined to confirm byte, the confirmation byte, the corresponding position with arbitration byte this detecting position is 0, before the position it is each it is high-order be 1, each low level is 0 after the position, then confirms that byte is carried out and computing with arbitration byte, if fortune It is not 0 to calculate result, represents that this is carved with the protocol conversion requirement of higher priority progress, system is again from the highest order of arbitration byte Detected;If operation result is 0, represent that protocol conversion can perform corresponding to the position this moment.
Compared with prior art, the invention has the advantages that:Design is simple, processing is accurate, is widely used, and can make more Individual task and agreement are handled and performed according to priority level in systems, improve protocol conversion efficiency and accuracy rate.
Brief description of the drawings
Fig. 1 is the system block diagram of the embodiment of the present invention 1.
Fig. 2 is the method for converting protocol flow chart of the embodiment of the present invention 1.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings:
The present invention is with the following method:
In embedded systems, the embedded system is made up of hardware and software, and hardware is by embedding for the conversion method operation Enter microsever, memory, generalized device interface, power supply composition, generalized device interface includes serial communication interface, Ethernet Interface, USB, I2C interface, SPI interface and other interfaces, distinct interface are passed using different communication protocol Transmission of data;Running software is controlled in embedded microprocessor to whole system;
Embedded system initializes, and defines an arbitration byte in system initialisation phase and an arbitration byte renewal is fixed When device be system protocol conversion use, described arbitration byte occupancy one byte memory headroom, wherein the byte each A kind of protocol conversion type is represented, each protocol conversion type priority level represented from high to low of byte reduces successively, Highest order represents the protocol conversion type of highest priority;Wherein, a certain position for arbitrating byte is 1, and representative has corresponding to the position Protocol conversion needs to carry out or carry out;The a certain position for arbitrating byte is 0, and represent needs without protocol conversion corresponding to the position Carry out;
The arbitration byte renewal timer is a timer internal in embedded microprocessor, fixed by setting this When device register, the timer can be with the time interval circulation timing of needs;
After the completion of system initialization, monitoring is timed to total interface using byte renewal timer is arbitrated, it is determined that being It is no to there is protocol conversion to need to carry out or carry out, the every information for arbitrating byte is updated according to snoop results;Then System is scheduled according to protocol conversion of the arbitration byte information to different priorities;After the completion of some protocol conversion, system Operation is zeroed out to the position that byte is arbitrated corresponding to the agreement, after having performed clear operation, system is again from arbitration byte Highest order starts to detect every information by high-low-position.
Here is how detailed narration system is detected and performed scheduling to arbitration byte:
(1) highest order of system detectio arbitration byte
Whether the method for being 1 is a certain position of system detectio arbitration byte, and system generates a byte first, is named as detection Byte, the detection byte, the correspondence position 1 with arbitrating this detecting position of byte, other positions 0, such as to detect arbitration byte Highest order, detection byte be 10000000, hexadecimal representation 0x80, then detects byte and the progress of arbitration byte and computing (operator is " & "), if operation result is 1, it is 1 to represent the arbitration byte position, if operation result is 0, represents arbitration word The position is saved as 0.
System is carried out using detection byte 0x80 with arbitration byte and computing, if arbitration byte highest order is 1, system is held The protocol conversion of row highest order corresponding types.
After converting, system is zeroed out operation, a certain position of the system to arbitration byte to the highest order for arbitrating byte The method for being zeroed out operation is that arbitration byte detection byte corresponding with the position carries out XOR (operator is " ⊕ "), And operation result is assigned to arbitration byte, the position 0 that this in byte detects so is arbitrated, other positions are still clear operation Value before.Here it is exactly to arbitrate byte to carry out XOR with 0x80 that operation is zeroed out to the highest order for arbitrating byte, and Operation result is assigned to arbitration byte.
After having performed clear operation, system detects since the highest order of arbitration byte again.
(2) if the highest order of arbitration byte is 0, a time high position for system detectio arbitration byte
System is using detection byte 0x40 and arbitration byte carries out and computing, is anti-if a time high position for arbitration byte is 1 The protocol conversion requirement that locking system has higher priority before the corresponding protocol conversion of this is performed is carried out, it is necessary to arbitrating word Section carries out confirmation operation, and system to the arbitration a certain position of byte (removing highest order) confirm that the method for operation is that system is given birth to first Into a byte, the byte is named to confirm byte, and the confirmation byte, the corresponding position with arbitration byte this detecting position is 0, is somebody's turn to do Each high position is 1 before position, and each low level is 0 after the position, such as to detect a time high position for arbitration byte, confirms that byte is 10000000, hexadecimal representation 0x80, then confirm byte and the progress of arbitration byte and computing, if operation result is not 0, Represent that this is carved with the protocol conversion requirement of higher priority progress, system is detected from the highest order of arbitration byte, protected again Demonstrate,prove the protocol conversion with high priority preferentially to carry out, if operation result is 0, represent protocol conversion corresponding to the position this moment It can perform.
If time high position for arbitrating byte is 1, system, which uses, confirms byte 0x80 with arbitrating byte progress and operation, if Operation result is not 0, and since system detect arbitrating byte highest order again, if operation result is 0, system performs a time high position Corresponding protocol conversion, after conversion end, operation is zeroed out to the secondary high position for arbitrating byte.
After having performed clear operation, system detects since the highest order of arbitration byte again.
(3) if a time high position for arbitration byte is 0, system is according to each below secondary high-order operating method detection arbitration byte Whether position is 1, is 1 until running into a certain position, and system carries out confirmation operation, and the position is read to save and carried out with arbitration byte with transporting really Calculate, if operation result is not 0, system is detected from the highest order of arbitration byte again, if operation result is 0, system Perform protocol conversion corresponding to the position, after conversion end, system is zeroed out operation to the position for arbitrating byte.
After having performed clear operation, system detects since the highest order of arbitration byte again.
(4) if the system detects that, the position all 0 that the conversion of certain type protocol is represented in byte is arbitrated, system returns Arbitration byte highest order restarts to be detected.
Embodiment 1:
There is many general equipment interface in embedded system, different interfaces transmits data using different communication protocol, System only includes 4 kinds of interfaces, respectively interface A, interface B, interface C, interface D, respectively using agreement A, agreement in the present embodiment B, agreement C and the types of agreement D tetra-, can also be according to being actually needed as shown in figure 1, can mutually be changed between four kinds of agreements Only carry out specific several types conversion, it is assumed here that only need to carry out agreement A to agreement D conversions, agreement B to agreement D conversions, association C to agreement D conversions are discussed, and agreement A to agreement D conversions have limit priority, agreement B to agreement D conversions have sub-priority, Agreement C to agreement D conversions have worst priority, and system realizes the scheduling of multiprotocol conversion by embedded microprocessor.
Fig. 2 is the flow chart of above-mentioned four kinds of method for converting protocol, the following detailed description of:
Step 1, system set an arbitration byte in initial phase, and the arbitration byte is represented using flag, arbitrates word Section flag initial value is represented in binary as 00000000, and arbitration byte flag mono- shares 8, according to order from left to right according to Secondary is the 7th, the 6th, the 5th, the 4th, the 3rd, the 2nd, the 1st, the 0th, and left side is a high position, and right side is low level.It is secondary Byte flag is cut out to be set as:
(1-1) specifies flag the 7th conversion for representing the agreement A to agreement D with limit priority;Specify flag's 6th conversion for representing the agreement B to agreement D with sub-priority;The 5th of flag is specified to represent with worst priority Conversions of the agreement C to agreement D;5th, the 4th, the 3rd, the 2nd, the 1st, the 0th does not represent any protocol conversion type.
The 7th of (1-2) arbitration byte flag, the 6th, a certain position of the 5th is when being 1, represent this corresponding types Protocol conversion requires to carry out or carry out;Arbitrate the 7th of byte flag, the 6th, a certain position of the 5th is when being 0, table Show that the protocol conversion of this corresponding types does not require to carry out.
Step 2, system set an arbitration byte renewal timer in initial phase, and the renewal timer can be at interval of A period of time detects whether that agreement A to agreement D conversion, agreement B to agreement D conversion and agreement C to agreement D conversion will Progress is asked, if so, system can be the position 1 of arbitration byte flag corresponding protocol conversion type, if not provided, under waiting One-time detection.
After step 3, initialization terminate, whether system detect arbitration byte flag first the 7th is 1, and detection method is Judge the detection byte 0x80 and arbitration byte flag of the 7th operation result with computing, if result is 1, show agreement A Conversion requirements to agreement D are carried out, and system performs following operate:
The conversion program that (3-1) system jumps to agreement A to agreement D at once is changed, until conversion end.
System is zeroed out operation, that is, arbitration byte flag and the 7th to arbitration byte flag after (3-2) conversion end The clearing byte 0x80 of position carries out XOR, and operation result is assigned into arbitration byte flag, so arbitrates byte flag The 7th clear 0, while retain the information of the 6th and the 5th, then system detects everybody from the 7th of arbitration byte again Information.
If step 4, the result for detecting the 7th are 0, whether detection the 6th is 1, and detection method is to judge the inspection of the 6th Glyphomancy section 0x40 and arbitration byte be flag's and operation result, if result is 1, shows that agreement B to agreement D conversion requirements enter OK, system carries out confirmation operation to arbitration byte, and method is the 6th section 0x80 (being represented in binary as 10000000) that reads really Carried out with arbitration byte flag and computing, operation result are as follows:
(4-1) if operation result is not 0, it is not 0 to show the 7th that arbitrates byte flag this moment, that is, has highest The agreement A of priority to agreement D conversion requirements are carried out, and system is detected from most 7 of arbitration byte again.
(4-2) if operation result is 0, representing the conversion of agreement B to agreement D this moment can perform, and system redirects at once Conversion program to agreement B to agreement D is changed, and after conversion end, system is zeroed out to the 6th that arbitrates byte flag Operation, that is, the clearing byte 0x40 progress XORs of arbitration byte flag and the 6th, and operation result is assigned to secondary Byte flag, so arbitrate byte flag the 6th clear 0 are cut out, while retains the information of the 7th and the 5th, then system weight Newly from the 7th every information of detection of arbitration byte.
If step 5, the result of detection the 6th are 0, whether the 5th of system detectio arbitration byte is 1, detection method To judge results with computing of the detection byte 0x20 of the 5th with arbitrating byte flag, if result is 1, show that agreement C is arrived Agreement D conversion requirements are carried out, and system carries out confirmation operation to arbitration byte flag, and method is confirmation byte 0xc0 (binary systems It is expressed as 11000000) carrying out with arbitration byte flag and computing, operation result is as follows:
(5-1) if operation result is not 0, it is not 0 to represent the 7th or the 6th that arbitrates byte flag this moment, yet It is the conversion requirements progress for agreement A to the agreement D conversion or agreement B of secondary high priority to agreement D for having limit priority, System is detected from most 7 of arbitration byte again.
(5-2) if operation result is 0, representing the conversion of agreement C to agreement D this moment can perform, and system redirects at once Conversion program to agreement C to agreement D is changed, and after conversion end, system is zeroed out to the 5th that arbitrates byte flag Operation, that is, the clearing byte 0x20 progress XORs of arbitration byte flag and the 5th, and operation result is assigned to secondary Byte flag, so arbitrate byte flag the 5th clear 0 are cut out, while retains the information of the 7th and the 6th, then system weight Newly from the 7th every information of detection of arbitration byte.
If step 6, detect arbitration byte flag the 7th, the 6th and the 5th all 0, system is again from secondary Cut out byte the 7th starts to detect.
By that analogy, it also can carry out conversion successively according to the method described above if there is further types of agreement in system and hold OK.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.

Claims (5)

  1. A kind of 1. multi protocol conversion method for possessing priority scheduling, it is characterised in that:The conversion method operates in embedded In system, the embedded system is made up of hardware and software, hardware by embedded microprocessor, memory, generalized device interface, Power supply forms;Generalized device interface includes serial communication interface, Ethernet interface, USB, I2C interface, SPI Interface and other interfaces, distinct interface use different communication protocol transmission data;Running software in embedded microprocessor, Whole system is controlled;
    Embedded system is initialized, and an arbitration byte and an arbitration byte renewal timer are defined in system initialisation phase Change and use for system protocol, described arbitration byte takes the memory headroom of a byte, wherein each equal generation of the byte A kind of protocol conversion type of table, each protocol conversion type priority level represented from high to low of byte reduce successively, highest Position represents the protocol conversion type of highest priority;Wherein, a certain position for arbitrating byte is 1, and representative has agreement corresponding to the position Conversion needs to carry out or carry out;The a certain position for arbitrating byte is 0, represent without protocol conversion corresponding to the position need into OK;
    The arbitration byte renewal timer is a timer internal in embedded microprocessor, by setting the timer Register, the timer can be with the time interval circulation timing of needs;
    After the completion of system initialization, monitoring is timed to total interface using byte renewal timer is arbitrated, it is determined whether have Protocol conversion is needed to carry out or carry out, and the every information for arbitrating byte is updated according to snoop results;Then system It is scheduled according to protocol conversion of the arbitration byte information to different priorities;After the completion of some protocol conversion, system is to this The position of arbitration byte is zeroed out operation corresponding to agreement, and after having performed clear operation, system is again from the highest of arbitration byte Position starts to detect every information by high-low-position.
  2. 2. a kind of multi protocol conversion method for possessing priority scheduling according to claim 1, it is characterised in that system is examined Surveying a certain position of arbitration byte, whether the method for being 1 is:System generates a byte first, is defined as detecting byte;Detect byte It is made up of 8 bits, the correspondence position of this detecting position of the detection byte with arbitration byte is 1, other positions 0;It is logical Detection byte and the progress of arbitration byte and computing are crossed, if operation result is 1, it is 1 to represent the arbitration byte position, and arbitrating byte should Protocol conversion representated by position requires to carry out or carry out;If operation result is 0, it is 0 to represent the arbitration byte position, secondary Protocol conversion representated by this of sanction byte does not require to carry out;System is since the highest order of arbitration byte, according to from a high position To the order of low level, operation result detection every information with computing of the detection byte with arbitrating byte is used.
  3. 3. a kind of multi protocol conversion method for possessing priority scheduling according to claim 1, it is characterised in that system exists Perform in arbitration byte after protocol conversion corresponding to a certain position, system is zeroed out behaviour to the position that byte is arbitrated corresponding to the agreement Make, the method for clear operation is:Arbitrate that byte is corresponding with the position to detect byte progress XOR, and by operation result assignment Arbitration byte is given, arbitrates the position 0 that this in byte detects, other are still the value before clear operation.
  4. A kind of 4. multi protocol conversion method for possessing priority scheduling according to claim 1, it is characterised in that:In system Perform non-limit priority protocol conversion perform before, system need to by judge one confirm byte with arbitration byte and fortune Whether the operation result of calculation is 0, is confirmed whether to have the protocol conversion requirement of higher priority to carry out.
  5. 5. a kind of multi protocol conversion method for possessing priority scheduling according to claim 4, it is characterised in that to prevent The protocol conversion requirement that system has higher priority before the corresponding protocol conversion of this is performed is carried out, it is necessary to arbitrating byte Confirmation operation is carried out, system confirm that the method for operation is to arbitration byte expense highest order:System generates a byte first, The byte is defined to confirm byte, the confirmation byte, the corresponding position with arbitration byte this detecting position is 0, each height before the position Position is 1, and each low level is 0 after the position, then confirms byte and arbitration byte carries out and computing, if operation result is not 0, table Show that this is carved with the protocol conversion requirement of higher priority progress, system is detected from the highest order of arbitration byte again;If Operation result is 0, represents that protocol conversion can perform corresponding to the position this moment.
CN201510444017.0A 2015-07-27 2015-07-27 A kind of multi protocol conversion method for possessing priority scheduling Expired - Fee Related CN105045743B (en)

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