CN102143073A - Data transmission method and system - Google Patents
Data transmission method and system Download PDFInfo
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- CN102143073A CN102143073A CN201110070410XA CN201110070410A CN102143073A CN 102143073 A CN102143073 A CN 102143073A CN 201110070410X A CN201110070410X A CN 201110070410XA CN 201110070410 A CN201110070410 A CN 201110070410A CN 102143073 A CN102143073 A CN 102143073A
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Abstract
The embodiment of the invention discloses a data transmission method and a data transmission system. The method comprises that: a first terminal splits data information to be transmitted to a second terminal, and packs the data information into data packets, wherein the data packet comprises a packet header and a packet body; the first terminal transmits the data packet to the second terminal, and waits for a receiving response fed back by the second terminal; if receiving the receiving response fed back by the second terminal in a preset time limit, the first terminal transmits the next data packet to the second terminal until all the data packets are transmitted to the second terminal; and if not receiving the receiving response or a retransmission request fed back by the second terminal in the preset time limit, the first terminal retransmits the latest transmitted data packet to the second terminal until the number of retransmission times exceeds a preset threshold. By the data transmission method and the data transmission system provided by the invention, errors can be rapidly and effectively corrected and remedied in a serial communication process so as to improve the quality of serial communication.
Description
Technical field
The present invention relates to field of data transmission, relate in particular to a kind of data transmission method and system.
Background technology
In the communications field, two kinds of data communication modes are arranged: parallel communications and serial communication.Compare the parallel communications mode, serial communication uses that circuit is few, cost is low, particularly when remote transmission, has avoided the inconsistent of many line characteristics, thereby is widely used in various occasions such as the communications field.Especially at industrial control field, serial communication mode Chang Zuowei information gathering, data transmission medium.
Present standard for serial communication has a lot, and the standard that people were familiar with has EIA-232, EIA-422 and EIA-485, just former alleged RS-232, RS-422 and RS-485.But these standards all can not be made very definite judgement to the correctness of data that sent or the data that receive, and can not be in the transmission course, and the situation of makeing mistakes is remedied.
In the serial communication operating process of reality, often because of factors such as electromagnetic interference or voltage instabilities, cause Serial Data Transfer Mode failure or error in data, traditional processing method is all data that will send are resend or manually to restart data transmission procedure, and in large-scale volume production product process, this wastes time and energy undoubtedly very much.At this situation, be necessary to propose a kind of error correction fast and effectively and mistake is carried out the remediation method, to improve the quality of serial communication.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of data transmission method and system are provided, can be in the serial communication process, and error correction fast and effectively and mistake carried out the remediation method is to improve the quality of serial communication.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of data transmission method, comprising:
First terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion;
First terminal sends packet to second terminal, and waits for the reception response of described second terminal feedback;
If first terminal receives the reception response of second terminal feedback in the time limit of presetting, then send next packet, until all packets being sent to described second terminal to described second terminal;
If first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback in the time limit of presetting,, surpass the threshold value that presets until retransmitting number of times then to the last packet that sends of described second terminal re-sends.
Wherein, described first terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as respectively before the packet, also comprises:
Described first terminal sends the handshake data sequence to second terminal, and waits for the handshake response of described second terminal;
If described first terminal receives the handshake response of second terminal feedback in the time limit of presetting, and the information that described handshake response is carried is correct, judge that then described first terminal is connected normally with serial ports between second terminal; Otherwise, judge that described first terminal is connected unusually with serial ports between second terminal, first terminal is suspended and is handled the data message that described needs send to second terminal.
Wherein, the attribute of described packet comprises: the type of packet, length, sequence number, effect value.
Wherein, first terminal sends packet to second terminal, and waits for after the reception response of described second terminal feedback, also comprises:
Second terminal receives the packet that first terminal sends, and resolves the packet header of described packet, judges that according to it its sequence number, effect value judge whether the data message in the described packet inclusion is correct;
If described being judged as is that then second terminal sends to described first terminal and receives response, and prepares to receive next packet that first terminal sends, until receiving all packets;
If described being judged as not, then second terminal sends re-send request may to described first terminal, and prepares to receive the packet of first terminal re-sends, surpasses the threshold value that presets until retransmitting number of times.
Wherein, described second terminal receives response to described first terminal transmission, and prepares to receive after next packet of first terminal transmission, also comprises:
If described second terminal is after described first terminal sends the reception response, in the time limit of presetting, do not receive next packet that described first terminal sends, then second terminal sends re-send request may to described first terminal, and the packet of preparation reception first terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Correspondingly, the embodiment of the invention also provides data transmission system, comprising: first terminal and second terminal;
First terminal, the data message that is used for needs are sent to second terminal is split as packet, sends to second terminal, and waits for the reception response of second terminal feedback; If first terminal receives described reception response in the time limit of presetting, then send next packet to second terminal, otherwise, to the last packet that sends of second terminal re-sends;
Second terminal is used to receive the packet that first terminal sends, and judges whether the data message in the described packet is correct; Be then to send and receive response, and prepare to receive next packet that first terminal sends if be judged as to first terminal; Otherwise, send re-send request may to first terminal, and prepare to receive the packet of first terminal re-sends.
Wherein, described first terminal comprises:
Data split module, and the data message that is used for needs are sent to second terminal splits, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion;
Data transmission blocks is used for the packet after second terminal sends described data fractionation resume module;
The transmission process module is used in described data transmission blocks after second terminal sends packet, waits for the reception response of second terminal feedback; If in the time limit of presetting, receive the reception response of second terminal feedback, then notify described data transmission blocks to send next packet, until all packets being sent to described second terminal to second terminal; Otherwise, notify described data transmission blocks to the last packet that sends of second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Wherein, described transmission process module comprises:
The serial ports detecting unit is used in first terminal sending the handshake data sequence by data transmission blocks to second terminal before second terminal sends packet, and waits for the handshake response of second terminal; If receive the handshake response of second terminal feedback in the time limit of presetting, and handshake response information is correct, it is normal to judge that then serial ports connects; Otherwise it is unusual to judge that serial ports connects;
The threshold value preset unit is used to preset from data transmission blocks and sends packet to second terminal, to the time limit that the reception that receives second terminal feedback responds, and the threshold value that allows to carry out the number of times of data packet retransmission;
Transmission processing unit is used in described data transmission blocks after second terminal sends packet, judges whether to receive in the time limit of presetting the reception response of second terminal feedback; If in the time limit of presetting, receive the reception response of second terminal feedback, then notify described data transmission blocks to send next packet, until all packets being sent to described second terminal to second terminal; If in the time limit of presetting, do not receive the reception response of second terminal feedback or receive the re-send request may that second terminal is fed back, then notify described data transmission blocks to the last packet that sends of second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Wherein, described packet comprises: packet header and inclusion, the attribute of the described packet of record in the described packet header; Recording section data message in the described inclusion; The attribute of described packet comprises: the type of packet, length, sequence number, effect value.
Wherein, described second terminal comprises:
Detection module is used to receive the packet that first terminal sends, and resolves the packet header of described packet, judges that according to it its sequence number, effect value judge whether the data message in the described packet inclusion is correct;
Respond module is used for when the data message of described detection module decision data bag inclusion is correct, sends to first terminal and receives response, and notify described detection module to prepare to receive next packet that first terminal sends, until receiving all packets; When the data message in described detection module decision data bag inclusion is incorrect, send re-send request may to first terminal, and the packet of notifying described detection module to prepare to receive first terminal re-sends, the threshold value that presets surpassed until retransmitting number of times;
The information synthesis module is used for after detection module is received all packets, and the partial data information that each packet is carried respectively reconfigures and is complete data message.
Wherein, described respond module also is used for: send to first terminal in described respond module and receive response, and when described detection module does not receive next packet of first terminal transmission in the time limit of presetting, then described respond module sends re-send request may to first terminal, and the packet of notifying described detection module to prepare to receive first terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Implement data transmission method and system that the embodiment of the invention provides, can be in the serial communication process, error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the data transmission method first embodiment schematic flow sheet provided by the invention;
Fig. 2 is the data transmission method second embodiment schematic flow sheet provided by the invention;
Fig. 3 is data transmission method the 3rd an embodiment schematic flow sheet provided by the invention;
Fig. 4 is first and second example structure schematic diagram of data transmission system provided by the invention;
Fig. 5 is the structural representation of first terminal in the data transmission system provided by the invention;
Fig. 6 is the structural representation of second terminal in the data transmission system provided by the invention.
Embodiment
Implement data transmission method and system that the embodiment of the invention provides, can be in the serial communication process, error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Referring to Fig. 1, be the data transmission method first embodiment schematic flow sheet provided by the invention, as shown in Figure 1, this data transmission method comprises:
At step S100, first terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion.
At step S101, first terminal sends packet to second terminal, and waits for the reception response of described second terminal feedback.
At step S102, whether first terminal judges has the reception response that receives second terminal feedback in the time limit of presetting, if first terminal receives the reception response of second terminal feedback, then execution in step S103 in the time limit of presetting; If first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback, then execution in step S104 in the time limit of presetting.
At step S103, first terminal receives the reception response of second terminal feedback in the time limit of presetting, send next packet to described second terminal, until all packets being sent to described second terminal.
At step S104, first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback in the time limit of presetting, to the last packet that sends of described second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Implement the data transmission method that present embodiment provides, can be in the serial communication process, error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Referring to Fig. 2, be the data transmission method second embodiment schematic flow sheet provided by the invention, in the present embodiment, will be from the flow process of detailed this data transmission method of description of data message transmitting terminal.As shown in Figure 2:
At step S200, described first terminal sends the handshake data sequence to second terminal, and waits for the handshake response of described second terminal; If described first terminal receives the handshake response of second terminal feedback in the time limit of presetting, and the information that described handshake response is carried is correct, judge that then described first terminal is connected normally with serial ports between second terminal; Otherwise, judge that described first terminal is connected unusually with serial ports between second terminal, first terminal is suspended and is handled the data message that described needs send to second terminal.
More specifically, handshake operation be used to detect first terminal is connected with the serial ports of second terminal whether can operate as normal.During with set-top box (second terminal) upgrading KEY file, handshake sequence " P0123456789 " is an example, and PC (first terminal) sends ASCII character value ' P ', and set-top box is successfully returned ' P '; PC sends ASCII character value ' 0 ', and set-top box successfully returns ' 0 '; PC sends ASCII character value ' 1 ', and set-top box successfully returns ' 1 ' ... all sequences success, illustrates that then PC is connected operate as normal with serial ports between the set-top box, can enter the transfer of data of essence, the KEY function of promptly upgrading.Different transfer of data can be detected by different handshake data sequences, and in this example, what character ' P ' representative entered is " upgrading KEY " function, and " 0123456789 " represents the cycle tests of shaking hands.
If the handshake operation of first terminal and second terminal is repeatedly unsuccessful, surpassed the frequency of failure of shaking hands (for example 5 times) that presets, then on terminal, provide the user this connection failure.
At step S201, first terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion.The attribute of described packet comprises: the type of packet, length, sequence number.
More specifically, on the basis of existing standard for serial communication, the data message that needs are sent does not carry out package processing, just directly apply to data transmit-receive, when communication made mistakes, the reason that is difficult to locate errors can not in time be carried out relevant treatment at mistake.
In order to solve the present situation that to restart transfer of data when the Serial Data Transfer Mode that causes because of objective factor is interrupted, the method that the embodiment of the invention provides is split as plurality of sections with the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as packet respectively, in the subsequent transmission process, these packets of transmission one by one in case its advantage is to occur mistake in the transmission course, are promptly retransmitted the packet of makeing mistakes automatically, under the situation of not makeing mistakes, normal transmission.This mode can improve production efficiency greatly in industrial processes.
Preferably, in the present embodiment, add cyclic redundancy check (CRC) code (CRC, Cyclic Redundancy Check) in packet header of packet and inclusion respectively, so as second terminal of receiving terminal in view of the above the judgment data transmission whether make mistakes.
At step S202, first terminal sends packet to second terminal, and waits for the reception response of described second terminal feedback.
At step S203, whether first terminal judges has the reception response that receives second terminal feedback in the time limit of presetting, and first terminal can not send packet before receiving the reception response.If first terminal receives the reception response of second terminal feedback, then execution in step S204 in the time limit of presetting; If first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback, then execution in step S205 in the time limit of presetting.
At step S204, first terminal receives the reception response of second terminal feedback in the time limit of presetting, send next packet to described second terminal, until all packets being sent to described second terminal.
More specifically, the described time limit of presetting is to determine by the both sides of transceive data information or according to standard agreement, first terminal receives the reception response of second terminal feedback in the time limit of presetting, show that second terminal received packet, and the data message that packet carries is correct, then first terminal then sends next packet to second terminal, until all packets being sent to described second terminal.
At step S205, first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback in the time limit of presetting, then, surpass the threshold value that presets until retransmitting number of times to the last packet that sends of described second terminal re-sends.
More specifically, mistake appears in first terminal does not receive second terminal feedback in the time limit of presetting reception response descriptive information in transmission course, and for example this data-bag lost does not arrive second terminal; Or second terminal received packet, but the reception of its feedback response loses in transmission course, do not arrive first terminal etc.If what first terminal received is re-send request may, illustrate that then second terminal received packet, but mistake etc. appears in the data message in the packet.Occurring under the abnormal situation of above-mentioned transmission, first terminal can be to the last packet that sends of described second terminal re-sends.
Preferably, for fear of because second terminal fault, the retransmission data bag that reasons such as serial communication route interruption are not stopped first terminal always, the waste resource, retransmit frequency threshold value (for example 10 times) so preset one, when the number of times of the same packet of first terminal re-sends surpasses threshold value, judge that first terminal is connected interruption with serial ports between second terminal, stop the repeating transmission of packet, until user or system start-up handshake operation next time.
Implement the data transmission method that present embodiment provides, data sending terminal splits all data that will send according to the length of data length and individual data bag.According to the attribute that sends data, transmitting terminal adds header packet information for each packet, and adds crc value.Then whole bag is sent to data receiver.After above process is finished, data sending terminal will enter the wait acknowledge state.If under not overtime situation, receive correct replying, just transmitting terminal sends next packet, otherwise resend this packet, this method is in the serial communication process, and error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Referring to Fig. 3, be data transmission method the 3rd embodiment schematic flow sheet provided by the invention, in the present embodiment, will be from the flow process of detailed this data transmission method of description of data message receiving terminal.As shown in Figure 3:
At step S300, second terminal receives the handshake data sequence that first terminal sends, and sends the handshake response of response to described first terminal; After the handshake operation success, illustrate that first terminal is connected normally the packet of second terminal preparation reception, first terminal transmission with serial ports between second terminal.
At step S301, second terminal receives the packet that described first terminal sends, and it is stored in the serial data buffering area.
At step S302, second terminal reads header data and CRC check is carried out in packet header from buffering area, if reading of data is overtime or the effect failure, then second terminal sends re-send request may to first terminal, and prepares to receive again this packet; If effect is passed through, then execution in step S303.
At step S303, second terminal guarantees that according to the sequence number in the packet header packet receiving order is correct, if incorrect, return re-send request may and gives first terminal, and abandon other data in the serial data buffering area; If correct, execution in step S304 then.
At step S304, second terminal reads the data message in the inclusion from the serial data buffering area, and inclusion is carried out CRC check; If effect is passed through, then execution in step S305; Otherwise second terminal sends re-send request may to first terminal.
At step S305, second terminal is carried out respective handling to the bag data, and after receiving all packets, the partial data information that each packet is carried respectively reconfigures and is complete data message.
Preferably, in the present embodiment, for fear of because first terminal fault, reasons such as serial communication route interruption make that second terminal do not stop always receives abnormal packet and causes second terminal constantly to send re-send request may, the waste resource, retransmit frequency threshold value (for example 10 times) so preset one, when second terminal pins surpasses threshold value to the re-send request may number of times of a certain packet, judge that first terminal is connected interruption with serial ports between second terminal, stop to send re-send request may, initiate next time handshake operation to second terminal until first terminal.
Implement the data transmission method that present embodiment provides, data sending terminal splits all data that will send according to the length of data length and individual data bag.According to the attribute that sends data, transmitting terminal adds header packet information for each packet, and adds crc value.Then whole bag is sent to data receiver.After above process is finished, data sending terminal will enter the wait acknowledge state.If under not overtime situation, receive correct replying, just transmitting terminal sends next packet, otherwise resend this packet, this method is in the serial communication process, and error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Referring to Fig. 4, be the data transmission system first example structure schematic diagram provided by the invention, as shown in Figure 4, this system comprises: first terminal 1 and second terminal 2.
First terminal 1, the data message that is used for needs are sent to second terminal 2 is split as packet, sends to second terminal 2, and waits for the reception response of second terminal, 2 feedbacks; If first terminal 1 receives described reception response in the time limit of presetting, then send next packet to second terminal 2, otherwise, retransmit the last packet that sends to second terminal 2.
Second terminal 2 is used to receive the packet that first terminal 1 sends, and judges whether the data message in the described packet is correct; If be judged as be, then send and receive response, and prepare to receive next packet that first terminal 1 sends to first terminal 1; Otherwise, send re-send request may to first terminal 1, and prepare to receive the packet that first terminal 1 is retransmitted.
Implement the data transmission system that present embodiment provides, can be in the serial communication process, error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
Referring to Fig. 4, be the data transmission system second example structure schematic diagram provided by the invention equally, in the present embodiment, with the structure and the function of first terminal and second terminal in this data transmission system of more detailed description.As shown in Figure 4, this system comprises equally: first terminal 1 and second terminal 2.
First terminal 1, the data message that is used for needs are sent to second terminal 2 is split as packet, sends to second terminal 2, and waits for the reception response of second terminal, 2 feedbacks; If first terminal 1 receives described reception response in the time limit of presetting, then send next packet to second terminal 2, otherwise, retransmit the last packet that sends to second terminal 2.
More specifically, as shown in Figure 5, this first terminal 1 comprises:
Data split module 11, and the data message that is used for needs are sent to second terminal splits, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion.The attribute of described packet comprises: the type of packet, length, sequence number.
On the basis of existing standard for serial communication, the data message that needs are sent does not carry out package processing, just directly applies to data transmit-receive, and when communication made mistakes, the reason that is difficult to locate errors can not in time be carried out relevant treatment at mistake.
In order to solve the present situation that to restart transfer of data when the Serial Data Transfer Mode that causes because of objective factor is interrupted, data in the embodiment of the invention split module 11 data message that needs send to second terminal are split as plurality of sections, and the each several part data message after will splitting is packaged as packet respectively.In the subsequent transmission process, these packets of data transmission blocks 12 transmission one by one in case its advantage is to occur mistake in the transmission course, can be retransmitted the packet of makeing mistakes automatically, under the situation of not makeing mistakes, and normal transmission.Preferably, in the present embodiment, data split module 11 and add cyclic redundancy check (CRC) code (CRC, Cyclic Redundancy Check) at the packet header and the inclusion of packet respectively, so as second terminal of receiving terminal in view of the above the judgment data transmission whether make mistakes.
Data transmission blocks 12 is used for the packet after second terminal sends 11 processing of described data fractionation module.Data transmission blocks 12 is received before the reception response of second terminal transmission in transmission process module 13, can not sent packet.
More specifically, transmission process module 13 receives the reception response of second terminal feedback in the time limit of presetting, show that second terminal received packet, and the data message that packet carries is correct, then transmission process module 13 notification data sending modules 12 send next packet to second terminal, until all packets being sent to described second terminal.
Mistake appears in transmission process module 13 does not receive second terminal feedback in the time limit of presetting reception response descriptive information in transmission course, for example this data-bag lost does not arrive second terminal; Or second terminal received packet, but the reception of its feedback response loses in transmission course, do not arrive first terminal etc.If what transmission process module 13 received is re-send request may, illustrate that then second terminal received packet, but mistake etc. appears in the data message in the packet.Occurring under the abnormal situation of above-mentioned transmission, transmission process module 13 meeting notification data sending modules 12 are to the last packet that sends of described second terminal re-sends.
Further, this transmission process module 13 comprises:
Serial ports detecting unit 131 is used in first terminal sending the handshake data sequence by data transmission blocks 12 to second terminal before second terminal sends packet, and waits for the handshake response of second terminal; If receive the handshake response of second terminal feedback in the time limit of presetting, and handshake response information is correct, it is normal to judge that then serial ports connects; Otherwise it is unusual to judge that serial ports connects.
Threshold value preset unit 132 is used to preset from data transmission blocks 12 and sends packet to second terminal, to the time limit that the reception that receives second terminal feedback responds, and the threshold value that allows to carry out the number of times of data packet retransmission.The meaning that the data packet retransmission frequency threshold value is set is, avoid because second terminal fault, the retransmission data bag that reasons such as serial communication route interruption are not stopped first terminal always, the waste resource, retransmit frequency threshold value (for example 10 times) so preset one, when the number of times of the same packet of first terminal re-sends surpasses threshold value, judge that first terminal is connected interruption with serial ports between second terminal, stop the repeating transmission of packet, until user or system start-up handshake operation next time.
Transmission processing unit 133 is used in described data transmission blocks 12 after second terminal sends packet, judges whether to receive in the time limit of presetting the reception response of second terminal feedback; If in the time limit of presetting, receive the reception response of second terminal feedback, then notify described data transmission blocks 12 to send next packet, until all packets being sent to described second terminal to second terminal; If in the time limit of presetting, do not receive the reception response of second terminal feedback or receive the re-send request may that second terminal is fed back, then notify described data transmission blocks 12 to the last packet that sends of second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
More specifically, as shown in Figure 6, this second terminal 2 comprises:
Detection module 21 is used to receive the packet that first terminal sends, and resolves the packet header of described packet, judges that according to it its sequence number, effect value judge whether the data message in the described packet inclusion is correct.
More specifically, detection module 21 receives the packet that described first terminal sends, and it is stored in the serial data buffering area, read the data of carrying in packet header and CRC check is carried out in packet header, if reading of data is overtime or the effect failure, then push-notification-answer module 22 sends re-send request may to first terminal, and prepares to receive again this packet; If effect is passed through, detection module 21 guarantees that according to the sequence number in the packet header packet receiving order is correct, if incorrect, then push-notification-answer module 22 sends re-send request may to first terminal, and abandons other data in the serial data buffering area; If correct, read the data message in the inclusion in the detection module 21 further serial data buffering areas, and inclusion is carried out CRC check; If effect is passed through, receive this data message; Otherwise push-notification-answer module 22 sends re-send request may to first terminal.
Respond module 22, be used for when the data message of described detection module 21 decision data bag inclusions is correct, send the reception response to first terminal, and notify described detection module 21 to prepare to receive next packet that first terminal sends, until receiving all packets.When the data message in described detection module 21 decision data bag inclusions is incorrect, send re-send request may, and notify described detection module 21 to prepare to receive the packet of first terminal re-sends, surpass the threshold value that presets until retransmitting number of times to first terminal.
Preferably, this respond module 22 also is used for: send to first terminal in described respond module 22 and receive response, and when described detection module 21 does not receive next packet of first terminal transmission in the time limit of presetting, then described respond module 22 sends re-send request may to first terminal, and notify described detection module 21 to prepare to receive the packet of first terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
Information synthesis module 23 is used for after detection module 21 is received all packets, and the partial data information that each packet is carried respectively reconfigures and is complete data message.
Implement the data transmission system that present embodiment provides, data sending terminal splits all data that will send according to the length of data length and individual data bag.According to the attribute that sends data, transmitting terminal adds header packet information for each packet, and adds crc value, then whole bag is sent to data receiver.After above process is finished, data sending terminal will enter the wait acknowledge state.If under not overtime situation, receive correct replying, just transmitting terminal sends next packet, otherwise resend this packet, this method is in the serial communication process, and error correction fast and effectively and mistake carried out remediation is to improve the quality of serial communication.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (11)
1. a data transmission method is characterized in that, comprising:
First terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion;
First terminal sends packet to second terminal, and waits for the reception response of described second terminal feedback;
If first terminal receives the reception response of second terminal feedback in the time limit of presetting, then send next packet, until all packets being sent to described second terminal to described second terminal;
If first terminal does not receive the reception response of second terminal feedback or receives the re-send request may of second terminal feedback in the time limit of presetting,, surpass the threshold value that presets until retransmitting number of times then to the last packet that sends of described second terminal re-sends.
2. data transmission method as claimed in claim 1 is characterized in that, described first terminal splits the data message that needs send to second terminal, and the each several part data message after will splitting is packaged as respectively before the packet, also comprises:
Described first terminal sends the handshake data sequence to second terminal, and waits for the handshake response of described second terminal;
If described first terminal receives the handshake response of second terminal feedback in the time limit of presetting, and the information that described handshake response is carried is correct, judge that then described first terminal is connected normally with serial ports between second terminal; Otherwise, judge that described first terminal is connected unusually with serial ports between second terminal, first terminal is suspended and is handled the data message that described needs send to second terminal.
3. data transmission method as claimed in claim 2 is characterized in that, the attribute of described packet comprises: the type of packet, length, sequence number, effect value.
4. data transmission method as claimed in claim 3 is characterized in that, first terminal sends packet to second terminal, and waits for after the reception response of described second terminal feedback, also comprises:
Second terminal receives the packet that first terminal sends, and resolves the packet header of described packet, judges that according to it its sequence number, effect value judge whether the data message in the described packet inclusion is correct;
If described being judged as is that then second terminal sends to described first terminal and receives response, and prepares to receive next packet that first terminal sends, until receiving all packets;
If described being judged as not, then second terminal sends re-send request may to described first terminal, and prepares to receive the packet of first terminal re-sends, surpasses the threshold value that presets until retransmitting number of times.
5. data transmission method as claimed in claim 4 is characterized in that, described second terminal receives response to described first terminal transmission, and prepares to receive after next packet of first terminal transmission, also comprises:
If described second terminal is after described first terminal sends the reception response, in the time limit of presetting, do not receive next packet that described first terminal sends, then second terminal sends re-send request may to described first terminal, and the packet of preparation reception first terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
6. a data transmission system is characterized in that, comprising: first terminal and second terminal;
First terminal, the data message that is used for needs are sent to second terminal is split as packet, sends to second terminal, and waits for the reception response of second terminal feedback; If first terminal receives described reception response in the time limit of presetting, then send next packet to second terminal, otherwise, to the last packet that sends of second terminal re-sends;
Second terminal is used to receive the packet that first terminal sends, and judges whether the data message in the described packet is correct; Be then to send and receive response, and prepare to receive next packet that first terminal sends if be judged as to first terminal; Otherwise, send re-send request may to first terminal, and prepare to receive the packet of first terminal re-sends.
7. data transmission system as claimed in claim 6 is characterized in that, described first terminal comprises:
Data split module, and the data message that is used for needs are sent to second terminal splits, and the each several part data message after will splitting is packaged as packet respectively, and described packet comprises: packet header and inclusion, write down the attribute of described packet in the described packet header; Recording section data message in the described inclusion;
Data transmission blocks is used for the packet after second terminal sends described data fractionation resume module;
The transmission process module is used in described data transmission blocks after second terminal sends packet, waits for the reception response of second terminal feedback; If in the time limit of presetting, receive the reception response of second terminal feedback, then notify described data transmission blocks to send next packet, until all packets being sent to described second terminal to second terminal; Otherwise, notify described data transmission blocks to the last packet that sends of second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
8. data transmission system as claimed in claim 7 is characterized in that, described transmission process module comprises:
The serial ports detecting unit is used in first terminal sending the handshake data sequence by data transmission blocks to second terminal before second terminal sends packet, and waits for the handshake response of second terminal; If receive the handshake response of second terminal feedback in the time limit of presetting, and handshake response information is correct, it is normal to judge that then serial ports connects; Otherwise it is unusual to judge that serial ports connects;
The threshold value preset unit is used to preset from data transmission blocks and sends packet to second terminal, to the time limit that the reception that receives second terminal feedback responds, and the threshold value that allows to carry out the number of times of data packet retransmission;
Transmission processing unit is used in described data transmission blocks after second terminal sends packet, judges whether to receive in the time limit of presetting the reception response of second terminal feedback; If in the time limit of presetting, receive the reception response of second terminal feedback, then notify described data transmission blocks to send next packet, until all packets being sent to described second terminal to second terminal; If in the time limit of presetting, do not receive the reception response of second terminal feedback or receive the re-send request may that second terminal is fed back, then notify described data transmission blocks to the last packet that sends of second terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
9. as each described data transmission system in the claim 6 to 8, it is characterized in that described packet comprises: packet header and inclusion, the attribute of the described packet of record in the described packet header; Recording section data message in the described inclusion; The attribute of described packet comprises: the type of packet, length, sequence number, effect value.
10. data transmission system as claimed in claim 9 is characterized in that, described second terminal comprises:
Detection module is used to receive the packet that first terminal sends, and resolves the packet header of described packet, judges that according to it its sequence number, effect value judge whether the data message in the described packet inclusion is correct;
Respond module is used for when the data message of described detection module decision data bag inclusion is correct, sends to first terminal and receives response, and notify described detection module to prepare to receive next packet that first terminal sends, until receiving all packets; When the data message in described detection module decision data bag inclusion is incorrect, send re-send request may to first terminal, and the packet of notifying described detection module to prepare to receive first terminal re-sends, the threshold value that presets surpassed until retransmitting number of times;
The information synthesis module is used for after detection module is received all packets, and the partial data information that each packet is carried respectively reconfigures and is complete data message.
11. data transmission system as claimed in claim 10, it is characterized in that, described respond module also is used for: send to first terminal in described respond module and receive response, and when described detection module does not receive next packet of first terminal transmission in the time limit of presetting, then described respond module sends re-send request may to first terminal, and the packet of notifying described detection module to prepare to receive first terminal re-sends, surpass the threshold value that presets until retransmitting number of times.
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| CN201110070410XA CN102143073A (en) | 2011-03-23 | 2011-03-23 | Data transmission method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110070410XA CN102143073A (en) | 2011-03-23 | 2011-03-23 | Data transmission method and system |
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| CN201110070410XA Pending CN102143073A (en) | 2011-03-23 | 2011-03-23 | Data transmission method and system |
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Application publication date: 20110803 |