CN102437928A - Communication method capable of self-adaptively switching between two speeds of CAN (Controller Area Network) bus - Google Patents
Communication method capable of self-adaptively switching between two speeds of CAN (Controller Area Network) bus Download PDFInfo
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- CN102437928A CN102437928A CN2011104179093A CN201110417909A CN102437928A CN 102437928 A CN102437928 A CN 102437928A CN 2011104179093 A CN2011104179093 A CN 2011104179093A CN 201110417909 A CN201110417909 A CN 201110417909A CN 102437928 A CN102437928 A CN 102437928A
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Abstract
The invention belongs to the technical field of computer network communication, and in particular relates to a method for automatically adapting to speed change of a bus. The technical scheme of the invention provides a communication method capable of self-adaptively switching between two speeds of a CAN (Controller Area Network) bus and an intelligent instrument can automatically adapt to the bus speeds of different systems by two ways as follows: one way is that a No.0 intelligent instrument is used for setting bus speeds for other intelligent instruments; and the other way is that the bus speeds can be automatically indentified and configured by the other intelligent instruments, so that the artificial configuration is not needed.
Description
Technical field
The invention belongs to the computer network communication technology field, the method that particularly a kind of automatic adaptation Bus Speed changes.
Background technology
Measurement and control area often adopts the CAN bussing technique in modern times; Be characterized in that (numbering 0～M) is connected with the CAN bus a plurality of intelligent instruments; Each intelligent instrument all has address of oneself and function independently, transmits self check, data or real time information through the CAN bus, constitutes an incorporate TT&C system.In general, the CAN bus communication speed of system is fixed, and each intelligent instrument only need be arranged to a fixed value on request.
But in some particular application, different like the bus communication speed of two systems, be general but require the intelligent instrument of access bus, perhaps same system needs to adopt the A traffic rate in certain environment, and in another environment, needs to adopt the B traffic rate.If intelligent instrument has the interface of setting, the operator can carry out the speed setting before then being connected with system, if intelligent instrument does not have the interface, just is difficult to adapt to the variation of traffic rate.
Summary of the invention
The objective of the invention is: a kind of means of communication that self adaptation is switched between two kinds of traffic rates of CAN bus are provided, communicate speed when intelligent instrument is powered on automatically and switch.
Technical scheme of the present invention is: the means of communication that self adaptation is switched between two kinds of CAN Bus Speeds may further comprise the steps:
A. establish have in the system that adopts the CAN bus one be numbered 0 intelligent instrument with in addition M number the intelligent instrument that is respectively 1～M; Be numbered 0 intelligent instrument to set the CAN bus communication speed be A or be B by said;
B. make said 0 the intelligent instrument back that powers on that is numbered carry out following steps:
B1. make i=1;
B2. the traffic rate according to the CAN bus is set at A or is B, and the variable bLastSpeed of order expression intelligent instrument and system's success communication last time speed is 0 or is 1;
B3. the CAN bus is current traffic rate is set at A;
B4. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B5. waiting n Time time;
B6. then forward b9 to by return data as receiving; Otherwise carry out b7;
B7. the CAN bus is current traffic rate is set at B;
B8. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B9. make i=i+1, if i＜M then carries out b3; Otherwise carry out b10;
B10. the traffic rate with the CAN bus is set at the value corresponding with bLastSpeed;
B11. finish;
C. after making the said intelligent instrument that is numbered 1～M power on, before carrying out main program, carry out following steps:
C1. be 0 or be 1 according to the variable bLastSpeed of this intelligent instrument of expression, the current traffic rate of this intelligent instrument is set at A or is B with system's success communication last time speed;
C2. communicate by letter with said 0 the intelligent instrument of being numbered;
C3. waiting n Time time;
If c4. receive return data, then forward c5 to; Otherwise, bLastSpeed is put instead, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed;
C5. finish;
D. receive in the service routine at the said intelligent instrument that is numbered 1～M, increase following steps:
D1. judge whether received breath is to be numbered 0 the bLastSpeed assignment that intelligent instrument sent;
D2. as not, then carry out d3; In this way, then accomplish the bLastSpeed assignment of this intelligent instrument, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed, to said 0 the intelligent instrument return data that is numbered;
D3. continue to carry out and receive service routine.
The present invention realizes that in two ways intelligent instrument adapts to the different system Bus Speed automatically; The one, for other intelligent instrument Bus Speed is set by No. 0 intelligent instrument; The 2nd, discern and be provided with Bus Speed automatically by other intelligent instrument, thereby need not to carry out manual work setting.
Embodiment
Embodiment 1: the means of communication that self adaptation is switched between two kinds of CAN Bus Speeds may further comprise the steps:
A. establish have in the system that adopts the CAN bus one be numbered 0 intelligent instrument with in addition M number the intelligent instrument that is respectively 1～M; Be numbered 0 intelligent instrument to set the CAN bus communication speed be A or be B by said;
B. make said 0 the intelligent instrument back that powers on that is numbered carry out following steps:
B1. make i=1;
B2. the traffic rate according to the CAN bus is set at A or is B, and the variable bLastSpeed of order expression intelligent instrument and system's success communication last time speed is 0 or is 1;
B3. the CAN bus is current traffic rate is set at A;
B4. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B5. waiting n Time time;
B6. then forward b9 to by return data as receiving; Otherwise carry out b7;
B7. the CAN bus is current traffic rate is set at B;
B8. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B9. make i=i+1, if i＜M then carries out b3; Otherwise carry out b10;
B10. the traffic rate with the CAN bus is set at the value corresponding with bLastSpeed;
B11. finish;
C. after making the said intelligent instrument that is numbered 1～M power on, before carrying out main program, carry out following steps:
C1. be 0 or be 1 according to the variable bLastSpeed of this intelligent instrument of expression, the current traffic rate of this intelligent instrument is set at A or is B with system's success communication last time speed;
C2. communicate by letter with said 0 the intelligent instrument of being numbered;
C3. waiting n Time time;
If c4. receive return data, then forward c5 to; Otherwise, bLastSpeed is put instead, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed;
C5. finish;
D. receive in the service routine at the said intelligent instrument that is numbered 1～M, increase following steps:
D1. judge whether received breath is to be numbered 0 the bLastSpeed assignment that intelligent instrument sent;
D2. as not, then carry out d3; In this way, then accomplish the bLastSpeed assignment of this intelligent instrument, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed, to said 0 the intelligent instrument return data that is numbered;
D3. continue to carry out and receive service routine.
Embodiment 2: like the embodiment 1 described means of communication that self adaptation is switched between two kinds of speed of CAN bus, it is characterized in that: the variable bLastSpeed of said expression intelligent instrument and system's success communication last time speed is stored in the outage memory cell of each intelligent instrument.
Embodiment 3: like the embodiment 1 described means of communication that self adaptation is switched between two kinds of speed of CAN bus, it is characterized in that: the variable bLastSpeed of said expression intelligent instrument and system's success communication last time speed is stochastic variable when intelligent instrument powers on.
Claims (3)
1. the means of communication that self adaptation is switched between two kinds of CAN Bus Speeds may further comprise the steps:
A. establish have in the system that adopts the CAN bus one be numbered 0 intelligent instrument with in addition M number the intelligent instrument that is respectively 1～M; Be numbered 0 intelligent instrument to set the CAN bus communication speed be A or be B by said;
B. make said 0 the intelligent instrument back that powers on that is numbered carry out following steps:
B1. make i=1;
B2. the traffic rate according to the CAN bus is set at A or is B, and the variable bLastSpeed of order expression intelligent instrument and system's success communication last time speed is 0 or is 1;
B3. the CAN bus is current traffic rate is set at A;
B4. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B5. waiting n Time time;
B6. then forward b9 to by return data as receiving; Otherwise carry out b7;
B7. the CAN bus is current traffic rate is set at B;
B8. communicate by letter with the intelligent instrument that is numbered i, bLastSpeed is given the intelligent instrument that is numbered i;
B9. make i=i+1, if i＜M then carries out b3; Otherwise carry out b10;
B10. the traffic rate with the CAN bus is set at the value corresponding with bLastSpeed;
B11. finish;
C. after making the said intelligent instrument that is numbered 1～M power on, before carrying out main program, carry out following steps:
C1. be 0 or be 1 according to the variable bLastSpeed of this intelligent instrument of expression, the current traffic rate of this intelligent instrument is set at A or is B with system's success communication last time speed;
C2. communicate by letter with said 0 the intelligent instrument of being numbered;
C3. waiting n Time time;
If c4. receive return data, then forward c5 to; Otherwise, bLastSpeed is put instead, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed;
C5. finish;
D. receive in the service routine at the said intelligent instrument that is numbered 1～M, increase following steps:
D1. judge whether received breath is to be numbered 0 the bLastSpeed assignment that intelligent instrument sent;
D2. as not, then carry out d3; In this way, then accomplish the bLastSpeed assignment of this intelligent instrument, the traffic rate of this intelligent instrument is set at the value corresponding with bLastSpeed, to said 0 the intelligent instrument return data that is numbered;
D3. continue to carry out and receive service routine.
2. the means of communication that self adaptation is switched between two kinds of speed of CAN bus according to claim 1, it is characterized in that: the variable bLastSpeed of said expression intelligent instrument and system's success communication last time speed is stored in the outage memory cell of each intelligent instrument.
3. the means of communication that self adaptation is switched between two kinds of speed of CAN bus according to claim 1, it is characterized in that: the variable bLastSpeed of said expression intelligent instrument and system's success communication last time speed is stochastic variable when intelligent instrument powers on.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110417909.3A CN102437928B (en) | 2011-12-15 | 2011-12-15 | Communication method capable of self-adaptively switching between two speeds of CAN (Controller Area Network) bus |
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| CN201110417909.3A CN102437928B (en) | 2011-12-15 | 2011-12-15 | Communication method capable of self-adaptively switching between two speeds of CAN (Controller Area Network) bus |
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| CN102437928A true CN102437928A (en) | 2012-05-02 |
| CN102437928B CN102437928B (en) | 2014-04-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724144A (en) * | 2012-06-26 | 2012-10-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Self-adaptive gateway device and data transmission method thereof |
| CN104320221A (en) * | 2014-11-13 | 2015-01-28 | 福州瑞芯微电子有限公司 | Bus transfer rate control method and device for communication module |
| CN108933718A (en) * | 2017-08-30 | 2018-12-04 | 北京猎户星空科技有限公司 | The configuration method of traffic rate, device and the network equipment in CAN network |
| CN113726402A (en) * | 2021-07-20 | 2021-11-30 | 西安空间无线电技术研究所 | Satellite-borne RS 485-based dual-bus self-adaptive control method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724144A (en) * | 2012-06-26 | 2012-10-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Self-adaptive gateway device and data transmission method thereof |
| CN102724144B (en) * | 2012-06-26 | 2015-06-10 | 浙江吉利汽车研究院有限公司杭州分公司 | Self-adaptive gateway device and data transmission method thereof |
| CN104320221A (en) * | 2014-11-13 | 2015-01-28 | 福州瑞芯微电子有限公司 | Bus transfer rate control method and device for communication module |
| CN104320221B (en) * | 2014-11-13 | 2018-01-09 | 福州瑞芯微电子股份有限公司 | The bus transfer rate control method and device of a kind of communication module |
| CN108933718A (en) * | 2017-08-30 | 2018-12-04 | 北京猎户星空科技有限公司 | The configuration method of traffic rate, device and the network equipment in CAN network |
| CN108933718B (en) * | 2017-08-30 | 2021-05-14 | 北京猎户星空科技有限公司 | Method and device for configuring communication rate in CAN (controller area network) and network equipment |
| CN113726402A (en) * | 2021-07-20 | 2021-11-30 | 西安空间无线电技术研究所 | Satellite-borne RS 485-based dual-bus self-adaptive control method |
| CN113726402B (en) * | 2021-07-20 | 2022-08-12 | 西安空间无线电技术研究所 | Satellite-borne RS 485-based dual-bus self-adaptive control method |
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| CN102437928B (en) | 2014-04-16 |
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