CN103440187A

CN103440187A - Hardware script-based automated CAN (Controller Area Network) bus test method

Info

Publication number: CN103440187A
Application number: CN2013103550901A
Authority: CN
Inventors: 刘矗; 莫莽; 吴宝红
Original assignee: SHANGHAI GUTAI TECHNOLOGY Co Ltd
Current assignee: SHANGHAI GUTAI TECHNOLOGY Co Ltd
Priority date: 2013-08-15
Filing date: 2013-08-15
Publication date: 2013-12-11

Abstract

The invention relates to a hardware script-based automated CAN bus test system and a hardware script-based automated CAN bus test method which are aimed at CAN buses. The hardware script-based automated CAN bus test system comprises a microcontroller, at least two CAN controllers and a USB (Universal Serial Bus) module, and is characterized in that the microcontroller is connected with the CAN controllers, each CAN controller can be independently connected with a CAN bus, a test script is edited on an upper computer, the upper computer compiles and then downloads the test script into the memory of the microcontroller, and the test script is executed in the memory of the microcontroller to automatically test a related device with a CAN interface.

Description

A kind of CAN bus automated testing method based on the hardware script

Technical field

The present invention relates to the method for testing of electronic technology field, particularly a kind of method of testing for the CAN bus.

Background technology

The CAN bus, as the communication interface between each microcontroller, has a wide range of applications in automobile and industry, along with the complicacy of each microcontroller internal processes based on the CAN bus is more and more higher, just increasing problem may appear in actual applications, this just needs by the method based on the CAN bus test, send relevant message as test input to unit under test, and the response message that obtains unit under test feeds back as content measurement, and the content of feedback and expection are compared, come to the same thing and think that the performance index of current test reach requirement, otherwise be not up to standard, need to modify and carry out repetition measurement the logic of microcontroller, thereby find as early as possible and deal with problems, guarantee reliability and the robustness of corresponding microcontroller in actual moving process.

Based on the CAN bus, tested ECU (Electrical Control Unit) is carried out to automatic test, common way is to write one by one test case for the entry of needs test, and on host computer, carry out one by one, by corresponding interface (such as USB turns the equipment of CAN bus), the message that needs are sent is issued on the bus be connected with tested node, read the response of tested node from bus, thereby compare at host computer simultaneously.

At host computer operation test script, have the following disadvantages: 1, host computer is non-real-time system, and there is unpredictable time delay in system, thereby can not guarantee that the message of precise time sends, and receives and timing function; 2, by specific CAN translation interface, computing machine is connected with the CAN bus, making an event on the CAN bus pass to host computer has huge time overhead, be all usually Millisecond other, test macro can not be made response in time, testing efficiency is low.

Summary of the invention

Purpose of the present invention, exactly in order to overcome the defect of carrying out the real-time deficiency of CAN bus automatic test based on PC, a kind of scheme of hardware implement test script is provided, thereby has eliminated the non real-time property of host computer and the impact that transmission delay is brought, improved testing efficiency and precision.

Concrete technical scheme provided by the invention is as follows:

A kind of CAN bus automated testing method based on the hardware script, use microcontroller to be connected with at least two CAN controllers, each CAN controller is connected to respectively on the CAN bus, in the microcontroller internal memory, carries out test script, and the relevant device with CAN interface is carried out to automatic test.

A kind of CAN bus automated testing method based on the hardware script, comprise hardware circuit, program of lower computer and host computer procedure.

A kind of CAN bus automated testing method based on the hardware script, described hardware circuit is comprised of microcontroller, at least two CAN controllers, USB modules; Microcontroller is connected with at least two CAN controllers, and each CAN controller connects a CAN transceiver, and each CAN transceiver all is connected to one independently on the CAN bus.

A kind of CAN bus automated testing method based on the hardware script, after described CAN controller listens to CAN message or erroneous frame on bus, by the data feedback monitored to microcontroller, microcontroller reads in local message reception buffer zone by it, and the data in reception buffer zone are uploaded to PC by the USB module.

A kind of CAN bus automated testing method based on the hardware script, described local message reception buffer zone, will be read by microcontroller, and carry out the comparison in test process, and comparison result is uploaded to host computer by the USB module.

A kind of CAN bus automated testing method based on the hardware script, after receiving the order of host computer by described USB module, microcontroller is configured, comprises the configuration of carrying out test script, the configuration of CAN bus parameter, the startup of test and stopping etc.

A kind of CAN bus automated testing method based on the hardware script, described PC control can be controlled test process, by USB interface, the data of returning in test process is shown in Application Program Interface simultaneously.

A kind of CAN bus automated testing method based on the hardware script, described test script will be edited and be compiled in the Application Program Interface of host computer, and by USB interface, the content after compiling be downloaded to the slave computer preservation and carries out

A kind of CAN bus automated testing method based on the hardware script, its advantage is, 1, reasonable in design, clear in structure, given full play to the microcontroller real-time good, and host computer has stronger text editing ability and the advantage of display capabilities; 2, real-time performance is good, and in the test script implementation, response can be accomplished the microsecond rank, and delay and the control data transmission of having eliminated system responses postpone, and efficiency is greatly improved

The accompanying drawing explanation

Fig. 1 is CAN bus automatic test hardware general frame figure in the invention process method

The process flow diagram that Fig. 2 is slave computer in the invention process method

Fig. 3 is host computer process flow diagram in the invention process method

In Fig. 1, microcontroller (101), CAN controller (102), CAN transceiver (103), CAN bus CANH(104), CAN bus CANL(105), USB module (106), PC (109), lower computer hardware circuit (110), USB line (111), tested node (112)

In Fig. 2, CAN controller reception buffer zone (201), the CAN controller sends buffer zone (202), and local CAN sends buffer zone (203), local CAN reception buffer zone (204), testing engine (205), the dependent event in test process (206), the test script compiled (207), test data reception buffer zone (208), test data sends buffer zone (209), computer CPU (211), test configurations application program (212)

In Fig. 3, USB driver (301), USB reception buffer zone (302), data processor (303), USB sends buffer zone (304), configuration data (305), script compile program (306), test script editing machine (307), test process display routine (308)

Embodiment

In Fig. 1, lower computer hardware circuit (110) comprises microcontroller (101), USB module (106) and CAN transceiver (103), lower computer hardware circuit (110) is connected to PC (109) by USB cable (111), simultaneously by CAN bus CANH(104) and CANL(105) be connected to tested node (112).

The inner integrated CAN transceiver of tested node (112) (103).

Microcontroller (101) connects at least two CAN controllers (102), the TX pin of each CAN controller and RX pin are connected respectively TX pin and the RX pin of CAN transceiver (103), the CANH of CAN transceiver is connected to CAN bus CANH(104), the CANL of CAN transceiver is connected to the CANL(105 of CAN bus).

Microcontroller (101), inner integrated CPU and internal memory, be connected with one or more independently CAN controllers; Or inner integrated one or more CAN controllers; What Fig. 1 showed is the situation of inner integrated two the CAN controllers of microcontroller (102).

CAN controller (102), as the protocol conversion chip of CAN bus, be responsible for the information such as the message on the CAN bus and erroneous frame are fed back to microcontroller, and each CAN controller has TX and the RX pin be connected with the CAN transceiver.

In Fig. 2, lower computer hardware circuit (110) is connected to PC (109) by USB cable (111), and PC (109) comprises at least one central processing unit (211), PC (109) internal operation test configurations application program (212).

Lower computer hardware circuit (110) is by connecting CAN bus CANH(104) and CAN bus CANL(105) with tested node, communicate.

The flow process that lower computer hardware circuit (110) receives the message of tested node is, after its CAN controller (102) listens to the CAN message by CAN transceiver (103), by its buffer memory to inner CAN reception buffer zone (201), and notice microcontroller (101), microcontroller (101) is submitted to testing engine (205) by calling receiver function (204) by the message of receiving, testing engine (205) judges according to received telegraph literary composition whether test case is passed through; Simultaneously microcontroller is saved in test data buffer zone (209) by it, by USB module (106) by these data upload to PC (109).

The testing process of lower computer hardware circuit (110) is, slave computer microcontroller (101) reads the relevant test data from USB module (106) from test data reception buffer zone (208), these test datas configure and issue by PC (109), microcontroller (101) always extracts the test script (207) compiled in the test data of self-test data reception buffer zone (208), and flow to testing engine (205), the test script (207) of testing engine based on having compiled, the message (204) returned according to current state-event (206) and tested node determines that current testing procedure is success or failure, and generation sends to the message of tested node, by sending function (203), will send to the message of tested node to put into the CAN transmission buffer zone of CAN controller (102), send to the CANH(104 of CAN bus by CAN transceiver (103) via CAN controller (102)) and CANL(105) on.

In Fig. 3, the test configurations application program (212) of host computer internal operation is connected to USB cable (111) by USB driver (301), thereby and sets up usb communication between lower computer hardware circuit (110).

Host computer test configurations program (212) shows that the flow process of current test mode is, the usb data that to upload from slave computer is put into USB reception buffer zone (302), reading out data from USB reception buffer zone (302) again, and, after processing by data processor (303), via test process display routine (308), show.

The process that host computer test configurations program (212) transmits test configurations to lower computer hardware is, the test script of use test script-editor (307) compiles user, and compile it as corresponding configuration data (305) by script compile program (306), and transfer data in USB transmission buffer zone (304), be issued to slave computer via USB driver (301).

Claims

1. the CAN bus automated testing method based on the hardware script, it comprises microcontroller, at least two CAN controllers, a USB module, it is characterized in that, use microcontroller to be connected with at least two CAN controllers, each CAN controller is connected to respectively on the CAN bus, at host computer editor test script, at host computer compiler test script, and by USB interface, the test script compiled is downloaded to slave computer, and carry out test script in the microcontroller internal memory of slave computer, the relevant device with CAN interface is carried out to automatic test.

2. a kind of CAN bus automated testing method based on the hardware script according to claim 1, is characterized in that, system comprises hardware circuit, program of lower computer and host computer procedure.

3. a kind of CAN bus automated testing method based on the hardware script according to claim 2, is characterized in that, the hardware circuit of system is comprised of microcontroller, at least two CAN controllers, USB modules; Microcontroller is connected with at least two CAN controllers, and each CAN controller connects a CAN transceiver, and each CAN transceiver all is connected to one independently on the CAN bus.

4. a kind of CAN bus automated testing method based on the hardware script according to claim 3, it is characterized in that, after the CAN controller of system listens to CAN message or erroneous frame on bus, by the data feedback monitored to microcontroller, microcontroller reads in local message reception buffer zone by it, and the data in reception buffer zone are uploaded to PC by the USB module.

5. a kind of CAN bus automated testing method based on the hardware script according to claim 4, it is characterized in that, microcontroller reads described local message reception buffer zone, and carries out the comparison in test process, and comparison result is uploaded to host computer by the USB module.

6. a kind of CAN bus automated testing method based on the hardware script according to claim 5, after receiving the order of host computer by described USB module, program of lower computer is configured, comprise the configuration of carrying out test script, the configuration of CAN bus parameter, the startup of test and stopping etc.

7. a kind of CAN bus automated testing method based on the hardware script according to claim 2, it is characterized in that, described host computer procedure can be controlled test process, by USB interface, the data of returning in test process is shown in Application Program Interface simultaneously.

8. a kind of CAN bus automated testing method based on the hardware script according to claim 7, it is characterized in that, described test script will be edited and be compiled in the Application Program Interface of host computer, and by USB interface, the content after compiling be downloaded to the slave computer preservation and carries out.