JP2008191024A - Waveform measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waveform measuring instrument capable of reporting the occurrence of an abnormality at the level of an application data obtained by giving a predetermined meaning to data transmitted via a serial bus in real time. <P>SOLUTION: The waveform measuring instrument 1 measures the waveform of the data transmitted via a transmission line such as the serial bus. The measuring instrument 1 includes a waveform analysis section 13 for determining a data value by applying waveform analysis according to the type of the serial bus to the data transmitted via the serial bus, a memory 16 for storing a conversion definition file F for defining a conversion rule of the data value according to the type of the serial bus, a conversion processing section 21 for converting the data value determined by the waveform analysis section 13 into the application data having the predetermined meaning according to the conversion definition file F stored in the memory 16, and a display control section 18 for displaying the application data on a display section 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a waveform measuring apparatus that measures the waveform of data transmitted via a serial bus.

  Waveform measuring devices such as digital oscilloscopes generally have a function to measure the waveform of data transmitted via a transmission path such as a serial bus. In recent years, however, analysis is performed to analyze the data value of the data. The one with the function is realized. The waveform measuring apparatus with such a function takes in data transmitted via the serial bus and displays the waveform, and binarizes the taken-in data when the analysis function is enabled Later, waveform analysis according to the type of serial bus is performed, and the data value obtained by waveform analysis is displayed. The displayed data value includes, for example, an ID that is an identifier indicating the type of the device connected to the serial bus, an ID that is an identifier indicating the type of data output from the device, a value of data output from the device, and the like. Yes, displayed in hexadecimal.

Here, the serial bus includes, for example, a PCI Express (registered trademark) bus, an IEEE 1394a bus, a FlexRay (registered trademark) bus, a CAN (Controller Area Network) bus, an I ² C (registered trademark) (Inter-Integrated Circuit) bus, and an SPI. (Registered trademark) (Serial Peripheral Interface) bus and the like.

The following Patent Document 1 discloses a conventional waveform measuring device for an IEEE 1394 bus, and the following Patent Documents 2 to 3 disclose a CAN bus, an I ² C (registered trademark) bus, or an SPI (registered trademark) bus. A conventional waveform measuring apparatus for use is disclosed.
JP 2000-349785 A JP 2002-158679 A JP 2002-311060 A JP 2005-164532 A

  By the way, when developing various devices connected to the serial bus, etc., whether there is an abnormality in the electrical signal level of various data transmitted via the serial bus from the data value obtained by the above analysis function It may be necessary to check whether there is an abnormality at the level of data (hereinafter referred to as application data) that has been given a predetermined meaning by converting the data based on a predetermined conversion rule. . Conventionally, whether or not there is an abnormality at the level of application data has been confirmed by performing the following procedure.

  First, the data transmitted via the serial bus is taken into the waveform measuring device over a certain period, and the data value of the data transmitted within that period is obtained by the above waveform analysis. Next, the data value obtained by the waveform measuring apparatus is transferred to a personal computer, and the user operates the personal computer to convert the transferred data value into application data. For example, when the data value is the ID described above, the data value is converted into the name of a device connected to the serial bus, or the name indicating the type of signal output from the device. Further, when the data value is a value of data transmitted from the device, the data value is converted into a physically meaningful value such as temperature, power, and rotation speed.

  Next, the application data is displayed on a display device included in the personal computer, and the user confirms the presence or absence of abnormal data from the display content. If necessary, predetermined processing such as statistical processing is performed on the application data before displaying the application data. Specifically, a graph (trend graph) showing a time change of the value of the application data, a histogram corresponding to the value of the application data, and the like are displayed to check whether there is abnormal data. When the abnormal data is confirmed, the user investigates the cause of the abnormality with reference to the time before and after the time when the abnormal data occurred.

  As described above, conventionally, the data value obtained by the waveform measuring apparatus over a certain period is transferred to a personal computer, and the data value is manually converted into application data, and then the presence / absence of abnormal data in the application data is checked. Since it was confirmed visually, there was a problem that it was impossible to immediately (in real time) know the abnormality that occurred at the application data level. For this reason, even if an abnormality occurs at the application data level, the cause of the abnormality cannot be immediately investigated and a countermeasure cannot be immediately taken. In addition, in order to obtain application data, it takes time and effort to transfer the data values obtained by the waveform measuring device to a personal computer, and it is necessary to visually detect abnormal data of application data. there were.

  The present invention has been made in view of the above circumstances, and is a waveform measurement capable of knowing in real time the occurrence of an abnormality at the level of application data having a predetermined meaning with respect to data transmitted via a serial bus. An object is to provide an apparatus.

In order to solve the above problems, a waveform measuring apparatus according to the present invention is a waveform measuring apparatus (1) for measuring a waveform of data transmitted via a serial bus, with respect to data transmitted via the serial bus. A waveform analysis unit (13) for obtaining a data value by performing waveform analysis according to the type of serial bus, and a conversion definition file (F) defining a conversion rule for the data value according to the type of serial bus. And a conversion processing unit (21) for converting the data value obtained by the waveform analysis unit into application data having a predetermined meaning according to the conversion definition file stored in the storage unit. And a display control unit (18) for displaying the application data on the display unit (19).
According to the present invention, the data transmitted through the serial bus is subjected to waveform analysis corresponding to the type of serial bus in the waveform analysis unit 13 to obtain the data value, which is converted by the conversion processing unit. The data is converted into application data having a predetermined meaning according to the definition file, and then displayed on the display unit by the display control unit.
Moreover, the waveform measuring apparatus of the present invention includes a statistical processing unit (22) that performs predetermined statistical processing on the application data converted by the conversion processing unit, and the display unit control unit includes the statistical processing The processing result of the part is displayed on the display part.
In the display control unit of the present invention, the data value includes an identifier indicating a type of data transmitted via the serial bus and the value of the data, and the conversion definition file includes at least the type of the data. It is a file that defines a name corresponding to an identifier to be indicated and a conversion formula of the data value.
Furthermore, the display control unit of the present invention is a detection unit that detects abnormal data included in the application data based on one of the application data converted by the conversion processing unit and the processing result of the statistical processing unit. (23).

  According to the present invention, since the data value subjected to waveform analysis by the waveform analysis unit is displayed after being converted into application data having a predetermined meaning by the conversion processing unit, an abnormality occurs at the level of the application data. There is an effect that can be known in real time. As a result, when an abnormality occurs at the application data level, it is possible to immediately investigate the cause of the abnormality and take immediate measures. Further, since it is not necessary to visually check for the presence or absence of abnormal data after a data value for a certain period is obtained as in the prior art, the user's usability is greatly improved.

  Hereinafter, a waveform measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a waveform measuring apparatus according to an embodiment of the present invention. As shown in FIG. 1, the waveform measuring apparatus 1 of the present embodiment includes an input terminal portion 2, a plurality of operation keys 3, and a display 4 on the front surface thereof.

  The input terminal unit 2 includes a plurality of input terminals, and a probe is connected to each input terminal as necessary. In the present embodiment, the tip of one probe connected to one of the input terminals of the input terminal unit 2 or a plurality of probes connected to each of the plurality of input terminals is connected to the serial bus to be measured. It shall be electrically connected. The operation key 3 is for inputting a user instruction to the waveform measuring apparatus 1 and includes a plurality of push buttons, a rotation key, and the like operated by the user.

  The display 4 is, for example, a liquid crystal display device or a CRT (Cathode Ray Tube). The measured waveform data, data values obtained by waveform analysis of the waveform data, and application data (given a predetermined meaning for the data values) Details will be described later), and various data such as processing results obtained by applying predetermined processing such as statistical processing to the application data is displayed. In FIG. 1, the waveform data WD indicating the waveform of data transmitted through a transmission path such as a serial bus, the data value DV corresponding to the waveform data WD, and the data value list displaying the data values in a list format. The case where DL is displayed on the display 4 is illustrated.

  FIG. 2 is a block diagram showing a main configuration of the waveform measuring apparatus according to the embodiment of the present invention. As shown in FIG. 2, the waveform measuring apparatus 1 of this embodiment includes an A / D converter 11, a waveform data memory 12, a waveform analyzer 13, a hard disk 14, a controller 15, a memory 16, an operation unit 17, and a display controller. 18 and a display unit 19.

  The A / D conversion unit 11 performs sampling and quantization on a signal input from the input terminal T1 which is one of the input terminals provided in the input terminal unit 2 illustrated in FIG. Convert to digital waveform data. Since signals may be input simultaneously from a plurality of input terminals provided in the input terminal unit 2 shown in FIG. 1, the A / D conversion units 11 are provided in a number corresponding to the number of input terminals. However, only one is shown in FIG.

  The waveform data memory 12 is a memory such as a RAM (Random Access Memory) that stores waveform data output from the A / D conversion unit 11. The waveform analysis unit 13 reads the waveform data stored in the waveform data memory 12 under the control of the control unit 15, performs waveform analysis according to the type of serial bus on the read waveform data, and outputs the data value. Ask. Specifically, the data transmitted via the serial bus is cut out for each large frame, and a data value corresponding to the bit sequence (sequence of values “0” and “1”) in the frame. Ask for. Here, as the data value obtained by the waveform analysis, for example, an ID that is an identifier indicating the type of the device connected to the serial bus, an ID that is an identifier indicating the type of data output from the device, and an output from the device There are data values.

  The hard disk 14 records various data such as data values obtained by the waveform analysis unit 13 and application data converted by a conversion processing unit 21 described later. The control unit 15 comprehensively controls the operation of the waveform measuring apparatus 1. For example, read control of waveform data stored in the waveform data memory 12 is performed, execution / non-execution of waveform analysis in the waveform analysis unit 13 is controlled, or read / write control of data to the hard disk 14 is performed.

  The control unit 21 includes a conversion processing unit 21, a statistical processing unit 22, and a detection unit 23. The conversion processing unit 21 converts the data value obtained by the waveform analysis unit 13 into application data having a predetermined meaning according to the conversion definition file F stored in the memory 16. For example, when the data value is an ID indicating the type of the device connected to the serial bus or an ID indicating the type of data output from the device, the conversion processing unit 21 converts the ID into the name or data of the device. Convert to the name. When the data value is a value of data output from the device, the data value is converted into a physically meaningful value such as temperature, power, and rotation speed.

  The statistical processing unit 22 performs predetermined statistical processing on the application data converted by the conversion processing unit 21. For example, a process of rearranging the application data in the order of measurement time is performed, and a graph (trend graph) showing the time change of the value is created. Alternatively, a process for obtaining the appearance frequency for each value of the application data is performed to create a histogram indicating the appearance frequency.

  The detection unit 23 detects abnormal data included in the application data converted by the conversion processing unit 21. Specifically, when a threshold value is set in advance by the user, when the application data exceeds the threshold value, the application data exceeding the threshold value is detected as abnormal data. When a certain condition is set by the user, application data when the condition is satisfied is detected as abnormal data. The application data exceeding a certain threshold and the application data when a certain condition is satisfied are not always “abnormal” data. However, in this specification, these application data are referred to as abnormal data for convenience. I will call it.

  The memory 16 is a memory for storing the conversion definition file F described above. Here, the conversion definition file F is a file that defines conversion rules for converting data values corresponding to the type of serial bus into application data. The conversion definition file F is a file that defines a name corresponding to at least the above-described ID (such as an ID indicating the type of data output from the device) and a data value conversion formula. In addition to these names and conversion formulas, the length of the data value, the upper and lower limit values of the converted value, the endian, and other information necessary for conversion can be appropriately defined.

  FIG. 3 is a diagram illustrating an example of the conversion definition file F. As illustrated in FIG. As shown in FIG. 3, a name (physical quantity) is associated with the ID, and a conversion formula for converting the physical quantity into a physical value is also associated. For example, the name “torque” is associated with the ID “0x0A”, and the name “electric power” is associated with the ID “0x0B”. The ID “0x0A” is associated with a conversion formula “× 0.85” to a physical value, and the ID “0x0B” is associated with a conversion formula “× 1.04”. In the conversion definition file F, such names and conversion formulas are provided for each type of serial bus.

  The operation unit 17 includes the operation keys 3 shown in FIG. 1 and inputs user instructions to the control unit 15. The display control unit 18 controls display contents displayed on the display unit 19 under the control of the control unit 15. For example, when waveform data is output from the control unit 15, the waveform data is displayed on the display unit 19. When a data value is output in addition to the waveform data, the waveform data WD, the data value DV, and the data value list DL are displayed as shown in FIG. Further, the display control unit 18 also causes the display unit 19 to display the application data converted by the conversion processing unit 21 and the processing result of the statistical processing unit 22 output from the control unit 15. The display unit 19 includes the display 4 shown in FIG. 1 and displays various data such as measured waveform data.

  Next, the operation of the waveform measuring apparatus 1 will be described. FIG. 4 is a flowchart showing the operation of the waveform measuring apparatus 1 according to one embodiment of the present invention. When measuring the data transmitted via the serial bus using the waveform measuring device 1, the user operates the operation key 3 (see FIG. 1) of the waveform measuring device 1 to make various initial settings (step S10). Specifically, the type of serial bus (IEEE 1394a bus, CAN bus, etc.) to be measured is set, whether or not waveform analysis is executed in the waveform analysis unit 13 (see FIG. 2), and the display contents displayed on the display unit 19 Make various settings such as. Setting contents input by the user operating the operation key 3 are input from the operation unit 17 to the control unit 15.

  When the above settings are completed, the user electrically connects the tip of the probe connected to the input terminal of the input terminal unit 2 provided in the waveform measuring apparatus 1 to the serial bus to be measured. Ingestion is started (step S11). A signal input from the input terminal T1 shown in FIG. 2 via the probe is sampled and quantized by the A / D converter 11 and binarized, and converted into waveform data which is a digital signal. The waveform data output from the A / D converter 11 is stored in the waveform data memory 12.

  The waveform data stored in the waveform data memory 12 is sequentially read out by the control unit 15 and output to the display control unit 18, and the display control unit 18 causes the display unit 19 to display the waveform data. With the above processing, waveform data indicating the waveform of data transmitted via the serial bus (for example, waveform data WD as shown in FIG. 1) is displayed on the display 4 (step S12).

  Next, the control unit 15 determines whether or not execution of waveform analysis is set in the initial setting in step S10 (step S13). When the waveform analysis execution is set (when the determination result is “YES”), the control unit 15 outputs a control signal to the waveform analysis unit 13 and stores the waveform data stored in the waveform data memory 12. The waveform data is copied by reading (step S14). It is assumed that the control signal output from the control unit 15 to the waveform analysis unit 13 includes information indicating the type of serial bus to be measured.

  Next, the waveform analysis unit 13 performs a waveform analysis corresponding to the type of serial bus on the copied waveform data to obtain a data value. Specifically, the waveform data is cut out for each frame that is a large break, and a data value corresponding to the bit sequence (sequence of values “0” and “1”) in the frame is obtained (step S15). Data values obtained by waveform analysis are stored in the hard disk 14.

  When the above waveform analysis is completed, the control unit 15 reads the data value stored in the hard disk 14, and the data value obtained by the waveform analysis unit 13 according to the conversion definition file F stored in the memory 16 by the conversion processing unit 21. Is converted into application data having a predetermined meaning (step S16). For example, when the data value is an ID indicating the type of the device connected to the serial bus or an ID indicating the type of data output from the device, the conversion processing unit 21 converts the ID into the name or data of the device. Convert to the name. When the data value is a value of data output from the device, the data value is converted into a physically meaningful value such as temperature, power, and rotation speed.

  The application data converted by the conversion processing unit 21 is output to the display control unit 18, and the display control unit 18 causes the display unit 19 to display the waveform data. The obtained application data may be displayed on the display unit 19 and stored in the hard disk 14. Through the above processing, the application data converted by the conversion processing unit 21 is displayed on the display 4 (step S17). Here, as shown in FIG. 1, the data value obtained by the waveform analysis 13 was displayed in hexadecimal notation for both the data value DV corresponding to the waveform data WD and the data value list DL. On the other hand, in the application data, physically meaningful names such as temperature, power, and rotation speed, and physical values thereof are displayed on the display 4. Note that the application data may be displayed in correspondence with the waveform data WD, similarly to the data value DV shown in FIG. 1, or may be displayed in a list format, similar to the data value list DL.

  The application data itself converted by the conversion processing unit 21 is not displayed as a numerical value, but a predetermined statistical process is performed on the application data by the statistical processing unit 22 and the result is displayed on the display unit 19. May be. FIG. 5 is a diagram illustrating a display example of application data. For example, when displaying the graph (trend graph) which shows the time change of application data on the display part 19, the statistical process part 22 performs the process which rearranges the data output from the conversion process part 21 in order of measurement time. When the data obtained by such processing is output to the display control unit 18, the display control unit 18 displays a trend graph as shown in FIG. In FIG. 5A, time is taken on the horizontal axis and data values are taken on the vertical axis, and a trend graph of the physical quantity “output” and the physical quantity “torque” is displayed.

  For example, when displaying a histogram corresponding to the value of the application data on the display unit 19, the statistical processing unit 22 performs a process of obtaining the appearance frequency for each value of the application data output from the conversion processing unit 21. When the data obtained by such processing is output to the display control unit 18, the display control unit 18 displays a histogram as shown in FIG. In FIG. 5B, the frequency (appearance frequency) is taken on the horizontal axis, and the value of the application data is taken on the vertical axis, and the histogram is displayed. The data obtained by the statistical processing unit 22 may be displayed on the display unit 19 and stored in the hard disk 14.

  Furthermore, the application data converted by the conversion processing unit 21 or the data obtained by performing predetermined statistical processing on the application data by the statistical processing unit 22 is not only displayed on the display unit 19 but also included in the application data. Abnormal data can be detected by the detection unit 23, and when abnormal data is detected, that fact can be displayed on the display unit 19. Specifically, the application data converted by the conversion processing unit 21 is constantly monitored by the detection unit 23. If there is a threshold set in advance by the user, the threshold is set when the application data exceeds the threshold. Exceeding application data is detected as abnormal data, and a message indicating that an abnormality has occurred is displayed on the display unit 19. If there is a condition set by the user, the application data when the condition is satisfied is detected as abnormal data, and a message indicating that an abnormality has occurred is displayed on the display unit 19.

  For example, as shown in FIG. 5C, when the application data becomes a value set by the user, the display of the application data can be stopped. In FIG. 5C, a trend graph similar to the trend graph with the physical quantity “torque” shown in FIG. 5A is displayed, but when the value of the application data becomes a value set by the user. After (time t1), the trend graph is not displayed. By performing such display, the user can immediately recognize that the application data has a value set at time t1 or that some abnormality has occurred.

  When the application data is displayed on the display 4, the control unit 15 determines whether or not another waveform data capture setting has been made (step S18). If another waveform data capture setting has been made (if the determination result is “YES”), the process returns to step S11, and another waveform data capture is started. On the other hand, when another waveform data acquisition setting is not made (when the determination result of step S18 is “NO”), a series of waveform data acquisition processing ends. The flowchart shown in FIG. 4 shows a series of processes from the acquisition of waveform data to its display. However, the processes of steps S14 to S17 are performed on the waveform data previously acquired in the waveform data memory 12. It is also possible to display application data and the like.

  The waveform measuring apparatus 1 of the present embodiment can display the application data on the display unit 19 by the above processing, but the processing described below can be performed in addition to the processing described above. FIG. 6 is a diagram for explaining an application example of the waveform measuring apparatus 1. Here, an example will be described in which the waveform measuring device 1 measures the rotational speed of a motor transmitted via a FlexRay (registered trademark) bus provided in a vehicle.

  FIG. 6A is a trend graph showing the number of rotations of the motor. The horizontal axis represents time and the vertical axis represents the number of rotations of the motor. In FIG. 6A, a curve indicated by reference sign D1 is a curve showing a time change of an actual data value (number of rotations of the motor) measured by the waveform measuring apparatus 1, and is indicated by reference sign D2. A curve is a figure which shows the time change of the application data obtained by performing the conversion process in the conversion process part 21. FIG.

  Moreover, the curve shown with the code | symbol D3 in FIG.6 (b) is a curve which shows the time change of the difference (rotational speed difference) between the curve D1 and the curve D2 in FIG. A curve indicated by TH is a threshold value of the rotational speed difference. In the example shown in FIG. 6, when the rotational speed difference indicated by the curve D3 exceeds the threshold value TH, the detection unit 23 provided in the control unit 15 detects abnormal data, and the display unit 19 displays that an abnormality has occurred. The Thereby, for example, operation verification of an actuator for operating a motor can be performed. As described above, the waveform measuring apparatus 1 according to the present embodiment not only detects abnormal data for only the application data, but also abnormal data for a predetermined calculation result between the application data and other data such as a data value. It can be detected.

  As described above, the waveform measuring apparatus 1 according to the present embodiment converts the data value subjected to waveform analysis by the waveform analysis unit 13 into application data having a predetermined meaning by the conversion processing unit 21. The occurrence of abnormalities at the level can be known in real time. As a result, when an abnormality occurs at the application data level, it is possible to immediately investigate the cause of the abnormality and take immediate measures. Further, since it is not necessary to visually check for the presence or absence of abnormal data after a data value for a certain period is obtained as in the prior art, the user's usability is greatly improved.

  The waveform measuring apparatus according to the embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and can be freely changed within the scope of the present invention. For example, in the above embodiment, the conversion processing unit 21, the statistical processing unit 22, and the detection unit 23 provided in the control unit 15 may be realized by hardware or may be realized by software. That is, you may implement | achieve by making a computer run the program which implement | achieves the conversion process part 21, the statistics process part 22, and the detection part 23. FIG.

It is a front view of the waveform measuring apparatus by one Embodiment of this invention. It is a block diagram which shows the principal part structure of the waveform measuring apparatus by one Embodiment of this invention. 6 is a diagram illustrating an example of a conversion definition file F. FIG. It is a flowchart which shows operation | movement of the waveform measuring apparatus 1 by one Embodiment of this invention. It is a figure which shows the example of a display of application data. 3 is a diagram for explaining an application example of the waveform measuring apparatus 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waveform measuring device 13 Waveform analysis part 16 Memory 18 Display control part 19 Display part 21 Conversion processing part 22 Statistical processing part 23 Detection part F Conversion definition file

Claims (4)

In a waveform measuring device that measures the waveform of data transmitted via a serial bus,
A waveform analysis unit that obtains a data value by performing waveform analysis according to the type of the serial bus for data transmitted via the serial bus; and
A storage unit that stores a conversion definition file that defines conversion rules for the data value according to the type of serial bus;
In accordance with the conversion definition file stored in the storage unit, a conversion processing unit that converts the data value obtained by the waveform analysis unit into application data having a predetermined meaning,
A waveform control apparatus comprising: a display control unit that displays the application data on a display unit. A statistical processing unit that performs predetermined statistical processing on the application data converted by the conversion processing unit;
The waveform measuring apparatus according to claim 1, wherein the display unit control unit displays the processing result of the statistical processing unit on the display unit. The data value includes an identifier indicating the type of data transmitted via the serial bus and the value of the data,
The waveform measurement according to claim 1, wherein the conversion definition file is a file that defines at least a name corresponding to an identifier indicating the type of the data and a conversion formula for the value of the data. apparatus.   3. A detection unit that detects abnormal data included in the application data based on one of the application data converted by the conversion processing unit and a processing result of the statistical processing unit. The waveform measuring apparatus described.

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