CN112054938A

CN112054938A - BM software universal test method of 1553B bus

Info

Publication number: CN112054938A
Application number: CN202010892301.5A
Authority: CN
Inventors: 王青松; 所玉君; 崔建飞
Original assignee: Tianjin Jinhang Computing Technology Research Institute
Current assignee: Tianjin Jinhang Computing Technology Research Institute
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-12-08
Anticipated expiration: 2040-08-31
Also published as: CN112054938B

Abstract

The invention relates to a universal BM software testing method of a 1553B bus, belonging to the technical field of 1553B bus communication. The method adds software application layer coverage test items on the basis of testing the electrical performance of the BM and the effectiveness of a 1553B data link layer protocol, provides a universal test method for BM software, which comprises a single-type message monitoring test, a multi-type message combination test, a channel switching test and a load rate test, and analyzes and explains the implementation steps and reasons of each test method. The technical scheme of the invention makes up the defects of the existing BM effectiveness testing method, increases the coverage of software testing, and does not depend on the experience of testers, thereby effectively improving the efficiency of BM software testing and ensuring the quality of BM software testing.

Description

BM software universal test method of 1553B bus

Technical Field

The invention belongs to the technical field of 1553B bus communication, and particularly relates to a universal BM software testing method of a 1553B bus.

Background

The 1553B bus is a digital time division command/response type multi-path transmission data bus defined by the US army standard MIL-STD-1553B, the bus standard strictly defines the structure, the message organization form, the data transmission method, the hardware characteristic and the like of the bus, and the 1553B bus has the advantages of simple network structure, good reliability and real-time performance and the like, and is widely applied to the military fields of aviation, aerospace, ships and the like at present.

The 1553B bus can simultaneously support 1 bus controller BC, 30 remote terminals RT and a plurality of bus monitors BM, in order to ensure the reliability of communication, the 1553B bus applied in practice adopts a double redundancy mode, and at least one bus monitor BM is mounted to store all messages running on the bus so as to be used for analyzing and troubleshooting of post-test data. The national military standard provides a test method for testing the electrical performance and the protocol of the BM in two layers, including input and output characteristics, input waveform compatibility, rise and fall time, input impedance, common mode rejection, odd check, two-phase coding, synchronous head coding, noise rejection test and the like, but only covering whether the basic functions of a protocol chip and application software meet requirements or not, and not covering the complexity of logic and the diversity of messages realized by the application layer software.

Disclosure of Invention

Technical problem to be solved

The technical problem to be solved by the invention is as follows: how to solve the problem of insufficient coverage of the existing BM effectiveness testing method, fill the blank in the field of BM software testing methods, and provide a 1553B bus BM software universal testing method.

(II) technical scheme

In order to solve the technical problem, the invention provides a universal BM software testing method of a 1553B bus, which comprises the following steps:

step 1, performing single-type message monitoring test;

step 2, performing a multi-type message combination test based on the step 1;

step 3, channel switching test is carried out based on the step 1 and the step 2;

and 4, carrying out load rate test based on the step 3, and testing the receiving and processing capacity of the BM to the message under the condition of high load rate.

Preferably, in step 1, testing the monitoring receiving capability of the BM for a single type of message, including ten types of messages including BC to RT message, RT to BC message, RT to RT message, mode instruction without data, sending mode instruction with data word, receiving mode instruction with data word, broadcast message from BC to RTs, broadcast message from RT to RTs, broadcast mode instruction without data, broadcast mode instruction with data word;

preferably, step 1 specifically comprises the following steps:

step 1.1: normal message test, testing the ability of BM to correctly receive the normally transmitted effective message;

for five types of messages including BC to RT messages, RT to BC messages, RT to RT messages, BC to RTS broadcast messages and RT to RTS broadcast messages, wherein the RT address range is 1-30, the subaddress range is 1-30, the data word length is 1-32 and all RTs are configured with normal state responses; for broadcast messages, the received RT address is 31, and the sub-address is 1-30; for the remaining five mode instructions, the sub-address is set to be 0 or 31, and the specific mode instruction is sent in a traversing manner; the excitation environment of the test is realized by a 1553B monitoring card of a software control standard, the interval between messages is set to be shortest, when the word length is 1, the data content is incrementally filled by 0-0 xFFFF, 65536 messages are sent, when the word length is 2-32, the data content of each word is set to be incrementally increased by 1 compared with the last word, and the test is carried out by the same method;

the above process is repeated for 10 times, and the message stored in the tested BM is interpreted according to the above logic, so as to obtain the conclusion of the normal message test result of the BM to the above ten kinds of single-type messages; if the BM passes the test result of the step 1.1 to be normal, continuing to carry out the test of the following step, otherwise, carrying out troubleshooting according to the type and the content of the message which fails the test;

step 1.2: testing no response message, wherein the BC configures the test operation of the first six non-broadcast messages and the broadcast messages from RT to RTS in the step 1.1, but does not configure RT response, and verifies the message receiving condition of the BM;

for RT-to-RT type messages, each combination simulates 3 situations that a transmitting RT is not on-line, a receiving RT is not on-line and a transmitting and receiving RT is not on-line;

step 1.3: the redundancy bus receiving test is carried out, the steps in 1.1-1.2 are repeated, and the message receiving condition of another redundancy receiving channel B of the BM is respectively tested;

step 1.4: and testing the message filtering function, verifying whether the BM has the capability of rejecting the design unacceptable message, designing and sending the message combination of the BM filtering information section on the bus, and checking whether the BM receives the message. The design test refers to the content in step 1.1, but only the RT address and the sub-address are designed, the difference between the data length and the content is ignored, and the ability of the BM to reject messages that are not accepted by the design is verified.

Preferably, in step 2, the BM module developed by a manufacturer is tested by a black box test method to stimulate different types of message combinations and check whether the message reception is correct or not.

Preferably, step 1 specifically comprises:

step 2.1: two messages of each type in the step 1.1 are selected, 20 messages in total form a bus scheduling large period, and cyclic scheduling is carried out between the large periods at intervals of 40 ms; for five messages with unfixed data lengths, namely broadcast from BC to RT, broadcast from RT to BC, broadcast from RT to RT, broadcast from BC to RTS and broadcast from RT to RTS, the data length is respectively shortest 1 and longest 32, and the data content is sent by selecting the beginning of 0x55AA and subsequent cyclic left shift; traversing and sending the mode instruction for the rest mode instruction type messages;

numbering 1-20 messages, carrying out permutation and combination design on the messages to obtain 20 factorial sort permutation and combination, taking an element of each permutation and combination as a large cycle of bus scheduling, exciting all permutation and combination numbers by using software, and testing the receiving condition of BM to each type of message combination;

step 2.2: and (3) receiving and testing the multi-type message combination redundancy channel, and performing the multi-type message combination test on the other redundancy receiving channel of the BM according to the step in 2.1.

Preferably, step 3 specifically comprises:

step 3.1: a single-type message channel switching test, namely respectively carrying out switching sending of channels A to B and B- > A on the ten messages in the step 1.1, and verifying the receiving capability of the BM to the messages;

when a single-type message channel switching test is carried out, ignoring the difference of RT addresses, sub-addresses and data contents, carrying out switching tests from channel A to channel B and from channel B to channel A on the message types with variable data length in the step 1.1 when the data length is 1 and the data length is 32, continuously switching each type of message for 100 times, and if the BM receives the messages normally, passing the test;

step 3.2: multi-type message channel switching test, respectively carrying out switching sending from the channel A to the channel B and from the channel B to the channel A on the message combination in the step 2.1, and verifying the message receiving capability of the BM;

on the basis of step 2.1, channel switching is performed on the even numbered messages of the permutation and combination elements of each large period, that is, channel switching is performed on the 2 nd, 4 th, 6 th, 8 th and 10 … 20 th messages in the large period, and a factorial test of 20 is performed, and if BM can receive all the messages, the test is passed.

Preferably, in step 4, the scheduling period of each message in step 3.2 is changed, so that the load rate is increased to 95% for 30 minutes of operation, and if the load rate is not passed, the load rate is decreased to 90% for 30 minutes of test, and so on until the test is passed, and a performance index result is obtained.

Preferably, the validity test of the single-channel dual-redundancy BM is completed in the steps 1-4, for the multi-channel BM of the single-board card, considering the most extreme situation, the multi-channel BM is all accessed into the same 1553B bus structure, so that the message triggering and the channel switching on the multi-channel 1553B bus are all performed at the same time, and if the test can be passed under the situation, the multi-channel BM is considered to be respectively hung in different 1553B bus structures and the test can be passed.

Preferably, in step 1.1, the interval between messages is set to 4 us.

The invention also provides application of the method in the technical field of 1553B bus communication.

(III) advantageous effects

The method of the invention adds software application layer coverage test items on the basis of testing the electrical performance of the BM and the effectiveness of a 1553B data link layer protocol, provides a universal test method for BM software, which comprises a single-type message monitoring test, a multi-type message combination test, a channel switching test and a load rate test, and analyzes and explains the implementation steps and reasons of each test method. The technical scheme of the invention makes up the defects of the existing BM effectiveness testing method, increases the coverage of software testing, and does not depend on the experience of testers, thereby effectively improving the efficiency of BM software testing and ensuring the quality of BM software testing.

Drawings

FIG. 1 is a bus topology structure diagram in a BM software universal test method of a 1553B bus according to the invention.

Detailed Description

In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

Aiming at the problem of insufficient coverage of the existing BM effectiveness testing method, the invention adopts the technical scheme that: a universal BM software testing method of a 1553B bus. Firstly, according to the provisions in the GJB8595.6 bus monitor test method, testing the electrical performance and 1553B data link layer protocol of the BM, and on the basis, adding a software coverage test item to complete the test analysis of the BM effectiveness.

Referring to a common bus topology structure diagram in fig. 1, a test environment of a BM software general test method for a 1553B bus of the present invention relates to a bus controller BC and a plurality of terminals RT in the diagram, and here, communication and substitution logic between the bus controller and a backup controller are not considered, and only operation of a currently running bus controller is constrained, where the BM refers to a pure bus monitor MT without a response function, and for testing a bus monitor combined with RT/MT, besides the test method of the present invention, an effectiveness test method of RT is also required. Firstly, a BM to be verified and test environments BC and RT are accessed into the same 1553B bus structure, and then the test is carried out according to the method of the following steps:

step 1, single type message monitoring test

The BM is tested for its ability to monitor reception of a single type of message, including BC to RT messages, RT to BC messages, RT to RT messages, mode instructions without data, mode instructions with data words (send), mode instructions with data words (receive), broadcast messages BC to RTs, broadcast messages RT to RTs, broadcast mode instructions without data, broadcast mode instructions with data words, broadcast ten types of messages.

Step 1.1: and normal message testing, namely testing the capability of the BM to correctly receive the normally transmitted effective message.

Preferably, for five types of messages including BC to RT messages, RT to BC messages, RT to RT messages, BC to RTS broadcast messages and RT to RTS broadcast messages, wherein the address range of the RT is 1-30, the sub-address range is 1-30 and the data word length is 1-32 in non-broadcast messages, and all RTs are configured with normal state responses; for broadcast messages, the received RT address is 31, and the sub-address is 1-30; for the remaining five mode instructions, the sub-address is set to 0 or 31, and the specific mode instruction is sent in a traversal mode.

Preferably, the excitation environment of the test is realized by a 1553B monitoring card controlled by software, the shortest distance (4us) is set between messages, when the word length is 1, the data content is incrementally filled by 0-0 xFFFF, 65536 messages are sent, when the word length is 2-32, the data content of each word is set to be 1 increased compared with the last word, and the test is carried out by the same method.

Preferably, each type of message is tested, with message excitation occurring at 25ms periods, with 20 messages being sent each period until the test is completed.

The experimental design is shown in the following table:

the above process is repeated for 10 times, and the messages stored in the tested BM are interpreted according to the above logic, so as to draw the conclusion that the BM tests the normal messages of the ten single-type messages. And if the test result of the BM through the step 1.1 is normal, continuing to perform the test of the following step, otherwise, performing troubleshooting according to the type and the content of the message which fails the test.

Step 1.2: and (3) no response message testing, wherein the BC configures the test operation of the first six kinds of non-broadcast messages and the broadcast messages from RT to RTS in the step 1.1, but does not configure RT responses, and verifies the message receiving condition of the BM.

In particular, for RT to RT type messages, each combination simulates 3 cases where the sending RT is not online, the receiving RT is not online, and the sending and receiving RT is not online.

Step 1.3: and (3) receiving and testing the redundancy bus, repeating the steps of 1.1-1.2, and respectively testing the message receiving condition of another redundancy receiving channel B of the BM.

Step 2, multi-type message combination test

The BM receives the mixed ability of multi-type messages, the logic of message processing may be different for different manufacturers, the ability of BM to process mixed messages has different degree correlation with the rationality of hardware scheme and the logic rigor of software implementation, so for BM module developed by a certain manufacturer, the black box test method is used to stimulate different types of message combination and check the message receiving correctness.

Step 2.1: the multi-type message combination single-channel test can arrange the number of permutation combinations with different numbers according to the conditions of message intervals, message types, message word lengths, message contents, the number proportion of various types of messages and the like, obviously, a full experimental design scheme is not suitable, based on the difficulties, extreme conditions are selected for verification, and if the BM can pass the test under the worst condition, other conditions can also pass the test.

Preferably, two messages of each type in step 1.1 are selected, 20 messages in total form a bus scheduling large period, and cyclic scheduling is performed at intervals of 40ms between the large periods. For five messages with unfixed data lengths, namely broadcast from BC to RT, broadcast from RT to BC, broadcast from RT to RT, broadcast from BC to RTS and broadcast from RT to RTS, the data length is respectively shortest 1 and longest 32, and the data content is sent by selecting the beginning of 0x55AA and subsequent cyclic left shift; and for the rest mode instruction type messages, sending the mode instruction in a traversing way.

Preferably, 20 messages are numbered from 1 to 20, and are subjected to permutation and combination design to obtain 20 factorial permutation and combination, an element of each permutation and combination is used as a large cycle of bus scheduling, all permutation and combination numbers are excited by software, and the receiving condition of the BM to each type of message combination is tested.

Step 3, channel switching test

Step 3.1: and (3) a single-type message channel switching test, namely respectively carrying out switching sending from the channel A to the channel B and from the channel B to the channel A on the ten messages in the step 1.1, and verifying the message receiving capability of the BM.

Preferably, when performing the single-type message channel switching test, ignoring the difference between the RT address, the sub-address and the data content, performing the switching test of the channels a to B and the channels B to a when the data length of the message types with variable data length in step 1.1 is 1 and the data length is 32, continuously switching each type of message for 100 times, and if the BM receives the message normally, passing the test.

Step 3.2: and (3) multi-type message channel switching test, namely respectively carrying out switching sending from the channel A to the channel B and from the channel B to the channel A on the message combination in the step 2.1, and verifying the message receiving capability of the BM.

Preferably, on the basis of step 2.1, the even-numbered messages of the permutation and combination elements of each large cycle are subjected to channel switching, that is, 2/4/6/8/10 … 20 th message (with even sequence number) in the large cycle is subjected to channel switching, and a test of 20 factorial large cycle scheduling is performed, and if the BM can receive all the messages, the test is passed.

Step 4, load factor test

And (3) testing and verifying various message types, message combinations, channel switching and the like in the steps 1-3, and testing the receiving and processing capacity of the BM to the messages under the condition of high load rate in the step.

And (3) changing the scheduling period of each message in the step 3.2, increasing the load rate to 95% and running for 30 minutes, if the load rate does not pass through the scheduling period, reducing the load rate to 90% and testing for 30 minutes, and repeating the steps until the test is passed, so that a performance index result is obtained.

The validity test of the single-channel dual-redundancy BM is completed through the steps 1 to 4, for the multi-channel BM of the single-board card, the most extreme condition needs to be considered, the multi-channel BM is all connected into the same 1553B bus structure, so that the message triggering and the channel switching on the multi-channel 1553B bus occur at the same time, the specific test method is the same as the steps 1 to 4, and if the test can be passed under the condition, the multi-channel BM is considered to be respectively connected in different 1553B bus structures in a hanging mode and can pass the test.

Therefore, the technical scheme of the universal test method for BM software of the 1553B bus can make up for the defects of the existing test method, increase the coverage of software test, and does not depend on the experience of testers, thereby effectively improving the efficiency of BM software test and ensuring the quality of the software test.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A universal BM software testing method for a 1553B bus is characterized by comprising the following steps:

step 1, performing single-type message monitoring test;

step 2, performing a multi-type message combination test based on the step 1;

2. The method of claim 1, wherein in step 1, the BM is tested for monitoring reception capability for a single type of message, including BC to RT messages, RT to BC messages, RT to RT messages, mode without data instructions, send mode with data words instructions, receive mode with data words instructions, BC to RTs broadcast messages, RT to RTs broadcast messages, mode without data instructions broadcast, mode with data words instruction broadcast ten types of messages.

3. The method according to claim 2, wherein step 1 comprises in particular the steps of:

4. The method of claim 3, wherein in step 2, the ability of the BM to receive multiple types of messages in a mixed manner is examined, and for a factory-developed BM module, different types of message combinations are stimulated by a black-box test method, and whether the messages are received correctly or not is checked correspondingly.

5. The method according to claim 4, wherein step 1 specifically comprises:

6. The method according to claim 5, wherein step 3 specifically comprises:

7. The method of claim 6, wherein in step 4, the scheduling period of each message in step 3.2 is changed to increase the load rate to 95% for 30 minutes of operation, and if not, the load rate is decreased to 90% for 30 minutes of test, and so on until the test is passed, and a performance index result is obtained.

8. The method of claim 7, wherein the validity test of the single-channel dual-redundancy BM is completed in steps 1 to 4, and for a multi-channel BM of a single-board card, considering the most extreme case, the multi-channel BM is all accessed into the same 1553B bus structure, so that message triggering and channel switching on the multi-channel 1553B bus occur at the same time, and if the test can be passed under the condition, the multi-channel BM is considered to be respectively hung in different 1553B bus structures and the test can be passed.

9. A method according to claim 3, characterised in that in step 1.1 the interval between messages is set to 4 us.

10. Use of a method according to any one of claims 1 to 9 in the field of 1553B bus communication technology.