CN101604270B - ARINC 429 communication redundancy method based on vxworks operation system - Google Patents
ARINC 429 communication redundancy method based on vxworks operation system Download PDFInfo
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- CN101604270B CN101604270B CN2009100232648A CN200910023264A CN101604270B CN 101604270 B CN101604270 B CN 101604270B CN 2009100232648 A CN2009100232648 A CN 2009100232648A CN 200910023264 A CN200910023264 A CN 200910023264A CN 101604270 B CN101604270 B CN 101604270B
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Abstract
The invention discloses an ARINC 429 communication redundancy method based on a vxworks operation system, mainly solving the problems of unreliability, low instantaneity and complex design of the redundancy method in the existing instant communication system. The method of the invention has the follow realizing procedures: in an upper computer and a CPU communication system, the upper computer communicates with CPU via two independent ARINC 429 channels, namely a main channel A and a spare channel B; the working sequence and the transmitted data of the two channels are identical; CPU stores data received from the two channels via two different circular buffer zones; before receiving data each time, CPU calls a channel choice function; firstly, the channel choice function judges the number of bytes in the two buffer zones, and detects and chooses a channel according to different situations of the number of bytes in the two buffer zones. The method fully utilizes the circular buffer zone operation function in vxworks, and simplifies the process of anomaly detection and information synchronization to treat faults in time, so that the reliability and the instantaneity of the system can be ensured in software.
Description
Technical field
The present invention relates to the communication technical field of real-time system, be specifically related to a kind of ARINC429 communication redundancy method based on vxworks.
Background technology
Vxworks operating system is a kind of embedded real-time operating system that U.S. Winder River company designed and developed in nineteen eighty-three, system provides good retractility when high-efficiency real-time multi-task is provided, promptly the critical piece of system can increase according to the requirement of application or delete.
ARINC429 is the special-purpose serial communication bus protocols of a kind of Aero-Space.Because the high speed and the reliability of the transmission information of ARINC429 own, it is applied in the avionics system of nearly all aircraft as a kind of general serial transmission bus standard.But various environmental factors on the aircraft, as shake, high low temperature, humidity and from the electromagnetic interference (EMI) of other equipment, the capital reduces the reliability of ARINC429 transmission information, so the high efficient and reliable communication at ARINC429 becomes very important, and redundancy is one of effective method that improves reliability of communication system.
At present, the normal the most simple and effective a kind of redundancy that adopts is exactly the hardware redundancy technology in the communication system, " dual-bus structure " in " serial port communication technology under the dual bus mode " literary composition, mentioned for example, be to come detection failure by fault test set, thereby realization communication redundancy, there is following technical bottleneck in this method: when break down when hardware detecting circuit self (1), can not monitor the state of principal and subordinate's passage, also can't finish the automatic switching function of principal and subordinate's passage; (2) owing to need the design hardware circuit, design of communication system and realization are complicated, have introduced additional insecure factor.
And for example in " the remaining design of aviation ARINC429 bus communication " literary composition, mention " design of redundant of information and realization ", it is the ARINC429 communication redundancy of realizing by Cyclic Redundancy Check, though this method has overcome the shortcoming of hardware redundancy, but coding is comparatively complicated, has increased the load of link.
Real-time is an important requirement in the communication technical field of real-time system in addition, and the above-mentioned redundancy approach of mentioning has all increased the complexity of system and the difficulty of design to a certain extent, thereby will inevitably reduce the real-time of system.
Summary of the invention
The objective of the invention is to overcome the many disadvantages of above-mentioned existing redundancy, a kind of ARINC429 communication redundancy method based on vxworks operating system is provided,, improve system real time to reduce the complicacy of hardware and coding.
In order to achieve the above object, technical scheme of the present invention may further comprise the steps:
(1) set up the ARINC429 communication channel of two independent communications between host computer and CPU, the cycle of carrying out is the cycle communication of period; Optional communication channel is as main channel A, and the communication port for giving tacit consent to, and selects an other channel B as alternate channel;
(2) calling the cycle that built-in function taskSpawn () creates based on operating system vxworks under the programmed environment of operating system vxworks is the periodic duty PCDeal of periodT, sends and handle the host computer data to receive; Create the first buffer circle RingAId and the second buffer circle RingBId is used for depositing the data that receive main channel A and alternate channel B respectively;
(3) write a channel selecting function C hoose429 () as follows:
3a) under the programmed environment of operating system vxworks, call among the operating system vxworks, obtain the byte number among buffer circle RingAId and the RingBId respectively the handling function rngNBytes () of buffer circle;
3b) create global variable NA as first counter, to byte number among the simultaneous RingAId be 0 and RingBId in byte number be not the inferior counting number of 0 this situation; Creating global variable NB as second counter, all is the inferior counting number that 0 this situation takes place to byte number among RingAId and the RingBId; If byte number is for being not 0 among RingAId and the RingBId, judge that then whether byte number if just adopt alternate channel B, otherwise adopts main channel A greater than byte number among the RingAId among the RingAId; If byte number takes place among the RingAId simultaneously is not 0 and RingBId in byte number be 0 this situation, then adopt main channel A;
3c) select a thresholding N, carry out abnormality detection,, switch to alternate channel B if the value of the first counter NA judges then that greater than this thresholding main channel A is unusual, otherwise rebound step 3a), writing of function C hoose429 () finished; If the value of the second counter NB judges then that greater than this thresholding two passages are all unusual, CPU does not receive data, enters secure operating mode, otherwise rebound step 3a), finish writing of function C hoose429 ().
(4) carry out creating of task PCDeal as follows by in the step (2):
4a) channel selecting function C the hoose429 () selector channel in the first invocation step (3) before each reception data;
4b) among the vxworks of call operation system to the operation built-in function rngBufGet () of buffer circle, read the data of this passage buffer circle, to finish reception to data.
In step (1), the work schedule of main channel A and alternate channel B and transmission data are identical, and the B passage is in the Hot Spare state.
In step (2), be the periodic duty that receives the host computer data by the mode of inquiry based on the task PCDeal of operating system vxworks, can require to change the period p eriodT of this task according to real-time.
At step 3b) in, the first counter NA adds at 1 o'clock, the second counter NB zero clearing; The second counter NB adds at 1 o'clock, the first counter NA zero clearing; When the situation outside any both of these case takes place, the first counter NA and second all zero clearings of counter NB.
At step 3c) described selection thresholding N, be that the communication cycle period according to host computer and CPU decides, promptly the execution time of N function C hoose429 () doubly equals the communication cycle period of host computer and CPU at least.
At step 4b) in, if the selected passage of task PCDeal call function Choose429 () is main channel A, from the second buffer circle RingBId, take out corresponding number when then task PCDeal peeks in the first buffer circle RingAId, and abandoning these data, realization main channel A and alternate channel B's is synchronous.
Combining information simultaneous techniques of the present invention and abnormality detection technology have following advantage:
(1) the present invention is because its task of receiving data is periodic duties, and the cycle can require to determine according to real-time, make communication system guarantee by redundancy on the basis of reliability, further satisfied the real-time requirement of system.
(2) periodic duty among the present invention is because advanced row of channels selection before each reception data; not only guaranteed to make corresponding processing timely when appearance is unusual; be switching channel or enter safe mode; also guaranteed after the abnormal restoring, in time reverted to automatically and adopt main channel communication.
(3) the present invention has simplified the processing to data owing to made full use of among the operating system vxworks the handling function of loop buffer.
(4) the present invention has realized detecting unusually to the synchronous of two channel transfer information with by gate method is set from software, has reduced the complicacy of system, has reduced the unreliable factor of system on hardware.
Description of drawings
Fig. 1 is realization flow figure of the present invention;
Fig. 2 is a process flow diagram of writing function C hoose429 () among the present invention;
Fig. 3 is the present invention makes different disposal according to the different situations of byte number among RingAId and the RingBId a process flow diagram;
Fig. 4 is that the present invention selects thresholding N to carry out the process flow diagram of abnormality detection.
Embodiment
Below in conjunction with accompanying drawing and program pseudo-code the specific embodiment of the present invention is elaborated:
In embodiment, the pseudo-code of the pairing function pcdeal of using of task PCDeal () is:
void?pcdeal()
{
……
while(1)
{
taskDelay(T)；
Choose429()；
……
}
……
}
The pseudo-code of the function C hoose429 () of the selector channel that uses is:
void?Choose429()
{
……
if()
{
……
NA＝0；NB＝0；
……
}
else?if()
{
NA++；NB＝0；
if(NA＜＝N)
{
Choose429()；
……
}
else
{
……
NA＝0；
}
}
else?if()
{
NB++；NA＝0；
if(NB＜＝N)
{
Choose429()；
……
}
else
{
……
NB＝0；
}
}
else
{
……
NA＝0；NB＝0；
}
……
}
With reference to Fig. 1, realization flow of the present invention is as follows:
Step 1 is set up communication port.
1a) from hardware, between host computer and CPU, set up the ARINC429 communication channel of two independent communications, the cycle of carrying out is the cycle communication of period;
1b) choose a communication channel wantonly as main channel A, and the communication port for giving tacit consent to, select an other channel B as alternate channel, the work schedule of main channel A and alternate channel B and transmission data are identical, and the B passage is in the Hot Spare state.
Step 2, creation task and buffer circle.
2a) calling the cycle that built-in function taskSpawn () creates based on operating system vxworks under the programmed environment of operating system vxworks is the periodic duty PCDeal of periodT, send and processing host computer data to receive, the concrete method of calling of function taskSpawn () is as follows:
taskSpawn(″PCDeal″，Priority，0，STACK_SIZE，(FUNCPTR)pcdeal，0，0，0，0，0，0，0，0，0，0)
Wherein, PCDeal is a task name, and Priority is the priority of this task, and STACK_SIZE is the storehouse size of Task Distribution, and pcdeal is the entry address of mission function.
Task PCDeal is that the mode by inquiry receives the periodic duty of host computer data, and requires to change the period p eriodT of this task according to real-time, changes periodT by the mode of calling the time-delay of built-in function taskDelay () change task;
2b) call built-in function rngCreate () and create the first buffer circle RingAId and the second buffer circle RingBId respectively, deposit the data that receive main channel A and alternate channel B respectively, when this function rngCreate () calls, there is an expression to receive the parameters R AM_VOLUME of the byte number of the needed buffer circle of host computer data, i.e. rngCreate (RAM_VOLUME).
Step 3 is write channel selecting function C hoose429 ().
With reference to Fig. 2, function C hoose429 () specifically to write flow process as follows:
3a) under the programmed environment of operating system vxworks, call among the operating system vxworks, obtain byte number among buffer circle RingAId and the RingBId respectively the handling function rngNBytes () of buffer circle;
3b),, do different processing with reference to Fig. 3 according to the different situations of byte number among the first buffer circle RingAId and the second buffer circle RingBId:
1. be that byte number is not 0 situation among the 0 and second buffer circle RingBId for byte number among the simultaneous first buffer circle RingAId, create the inferior counting number of global variable NA as first its generation of counter;
2. all be 0 situation for byte number among the first buffer circle RingAId and the second buffer circle RingBId, create the inferior counting number of global variable NB as second its generation of counter; Since the inferior counting number that the first counter NA and the second counter NB only recur corresponding situation, so the first counter NA adds at 1 o'clock, the second counter NB zero clearing; The second counter NB adds at 1 o'clock, the first counter NA zero clearing; When the situation outside any both of these case takes place, the first counter NA and second all zero clearings of counter NB;
3. 0 situation for byte number among the first buffer circle RingAId and the second buffer circle RingBId, judge that then whether byte number is greater than byte number among the first buffer circle RingAId among the second buffer circle RingBId, if just adopt alternate channel B, otherwise adopt main channel A; If byte number is not 0 among the first buffer circle RingAId and the second buffer circle RingBId, and the byte number of the number among the second buffer circle RingBId is greater than the byte number among the first buffer circle RingAId, represent that then data have appearred having lost unusually in A channel before this, discontinuous for the reception that prevents data, should adopt the B tunneling traffic;
4. be not that byte number is 0 situation among the 0 and second buffer circle RingBId for byte number among the first buffer circle RingAId takes place simultaneously, then adopt main channel A;
5. select a thresholding N to carry out abnormality detection, wherein thresholding N is that communication cycle period according to host computer and CPU decides, be the communication cycle period that equals execution time of N function C hoose429 () doubly host computer and CPU at least, the reason of doing like this is if passage does not all have data transmission in the time greater than the communication cycle period of host computer and CPU, then represents channel abnormal.
With reference to Fig. 4, above-mentioned steps 5. in the concrete grammar of abnormality detection as follows:
If, switch to alternate channel B, otherwise continue rebound step 3a if the value of the first counter NA judges then that greater than this thresholding main channel A is unusual), finish writing of function C hoose429 (); If the value of the second counter NB judges then that greater than this thresholding two passages are all unusual, CPU does not receive data, enters secure operating mode, otherwise rebound step 3a), finish writing of function C hoose429 ().
Step 4, carry out creating of task PCDeal as follows by in the step (2):
4a) channel selecting function C the hoose429 () selector channel in the first invocation step (3) before each reception data, so not only guaranteed to make corresponding processing timely when appearance is unusual, be switching channel or enter safe mode, also guaranteed after the abnormal restoring, in time reverted to automatically and adopt main channel communication;
4b) among the vxworks of call operation system to the operation built-in function rngBufGet () of buffer circle, read the data of this passage buffer circle, to finish reception to data.If the selected passage of task PCDeal call function Choose429 () is main channel A, from the second buffer circle RingBId, take out corresponding number when then task PCDeal peeks in the first buffer circle RingAId, and abandoning these data, realization main channel A and alternate channel B's is synchronous.If the communication channel of selecting is alternate channel B and since only in the first buffer circle RingAId byte number be just can select alternate channel B under 0 the situation, so need not guarantee synchronously from first buffer circle RingAId peek again.
Claims (6)
1. ARINC429 communication redundancy method based on vxworks operating system may further comprise the steps:
(1) set up the ARINC429 communication channel of two independent communications between host computer and CPU, the cycle of carrying out is the cycle communication of period; Optional communication channel is as main channel A, and the communication port for giving tacit consent to, and selects an other channel B as alternate channel;
(2) calling the cycle that built-in function taskSpawn () creates based on operating system vxworks under the programmed environment of operating system vxworks is the periodic duty PCDeal of periodT, sends and handle the host computer data to receive; Create the first buffer circle RingAId and the second buffer circle RingBId is used for depositing the data that receive main channel A and alternate channel B respectively;
(3) write a channel selecting function C hoose429 () as follows:
3a) under the programmed environment of operating system vxworks, call among the operating system vxworks, obtain the byte number among buffer circle RingAId and the RingBId respectively the handling function rngNBytes () of buffer circle;
3b) creating global variable NA as first counter, is that byte number is not the inferior counting number of 0 this situation among the 0 and second buffer circle RingBId to byte number among the simultaneous first buffer circle RingAId; Creating global variable NB as second counter, all is the inferior counting number that 0 this situation takes place to byte number among the first buffer circle RingAId and the second buffer circle RingBId; If byte number is not 0 among the first buffer circle RingAId and the second buffer circle RingBId, judge that then whether byte number is greater than byte number among the first buffer circle RingAId among the second buffer circle RingBId, if just adopt alternate channel B, otherwise adopt main channel A; Byte number is not that byte number is 0 this situation among the 0 and second buffer circle RingBId among the first buffer circle RingAId if take place simultaneously, then adopts main channel A;
3c) select a thresholding N, carry out abnormality detection, this thresholding N is that the communication cycle period according to host computer and CPU decides, if the value of the first counter NA is greater than this thresholding, judge that then main channel A is unusual, switch to alternate channel B, otherwise rebound step 3a), writing of function C hoose429 () finished; If the value of the second counter NB judges then that greater than this thresholding two passages are all unusual, CPU does not receive data, enters secure operating mode, otherwise rebound step 3a), finish writing of function C hoose429 ().
(4) carry out creating of task PCDeal as follows by in the step (2):
4a) channel selecting function C the hoose429 () selector channel in the first invocation step (3) before each reception data;
4b) among the vxworks of call operation system to the operation built-in function rngBufGet () of buffer circle, read the data of this passage buffer circle, to finish reception to data.
2. ARINC429 communication redundancy method as claimed in claim 1, in step (1), the work schedule of main channel A and alternate channel B and transmission data are identical, and the B passage is in the Hot Spare state.
3. ARINC429 communication redundancy method as claimed in claim 1, in step (2), task PCDeal based on operating system vxworks is the periodic duty that receives the host computer data by the mode of inquiry, can require to change the period p eriodT of this task according to real-time.
4. ARINC429 communication redundancy method as claimed in claim 1 is at step 3b) in, the first counter NA adds at 1 o'clock, the second counter NB zero clearing; The second counter NB adds at 1 o'clock, the first counter NA zero clearing; When the situation outside any both of these case takes place, the first counter NA and second all zero clearings of counter NB.
5. ARINC429 communication redundancy method as claimed in claim 1, at step 3c) described thresholding N is that communication cycle period according to host computer and CPU decides, promptly the execution time of N function C hoose429 () doubly is more than or equal to the communication cycle period of host computer and CPU.
6. ARINC429 communication redundancy method as claimed in claim 1, at step 4b) in, if the selected passage of task PCDeal call function Choose429 () is an A channel, from the second buffer circle RingBId, take out corresponding number when then task PCDeal peeks in the first buffer circle RingAId, and abandoning these data, realization main channel A and alternate channel B's is synchronous.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101770411B (en) * | 2009-12-31 | 2012-07-04 | 北京和利时系统工程有限公司 | Method for automatically selecting redundant data, analyzer and method for realizing non-interference switch |
| CN102137028B (en) * | 2011-05-06 | 2013-09-11 | 杭州华三通信技术有限公司 | Method and device for realizing 1+1 redundancy on synchronous serial port |
| JP5969689B2 (en) * | 2012-04-18 | 2016-08-17 | アクメ パケット インコーポレイテッドＡｃｍｅ Ｐａｃｋｅｔ， Ｉｎｃ． | Redundancy for real-time communication |
| CN104378796A (en) * | 2014-04-30 | 2015-02-25 | 许继电气股份有限公司 | Redundant network seamless switching method and device |
| CN106200527A (en) * | 2016-08-12 | 2016-12-07 | 中国航空工业集团公司西安飞行自动控制研究所 | A kind of airborne air data system data capture method based on double remainings |
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| US5261099A (en) * | 1989-08-24 | 1993-11-09 | International Business Machines Corp. | Synchronous communications scheduler allowing transient computing overloads using a request buffer |
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2009
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0413873A1 (en) * | 1989-08-24 | 1991-02-27 | International Business Machines Corporation | Fast scheduler allowing transient computing overloads |
| US5261099A (en) * | 1989-08-24 | 1993-11-09 | International Business Machines Corp. | Synchronous communications scheduler allowing transient computing overloads using a request buffer |
Non-Patent Citations (2)
| Title |
|---|
| 万风琴.智能化飞机燃油管理系统中的ARINC429通讯技术的研究.《航空精密制造技术》.2009,第45卷(第2期),39-42. * |
| 刘宗玉,王玮,陈明,田洪波.综合导航系统中的实时多任务软件设计.《计算机工程与应用》.2004,185-187. * |
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