JPH05312837A - Waveform display method and its device - Google Patents

Abstract

PURPOSE:To enable display of many channels simultaneously by dividing waveform data of a plural number of taken-in channels into blocks per any number of channels and displaying them in the screen regions divided in the direction of time axis sequentially. CONSTITUTION:Waveform data of many channels taken in a measuring section 10 written in such a way that it is located on the lower side in longitudinal direction per channel sequentially in the condition that channel is taken in longitudinal direction and time T is taken in transverse direction in a virtual image memory section 5A by executing a virtual screen preparation processing program 2A of ROM2 by a CPU1 to prepare virtual screen. Next, when a real screen preparation processing program 2B is executed, data on virtual screen is divided into blocks per any n (integer of 2 or more) number of channels, developed in the direction of time axis, and written in a real screen memory section 5B to prepare real screen data. This real screen data is displayed on CRT display unit 7. When the screen division number in the direction of time axis is m, it is possible to display the number of channels m times the conventional number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform display device suitable for a logic analyzer using a microprocessor.

[0002]

2. Description of the Related Art A logic analyzer compares a signal from a circuit under test with a threshold voltage, converts the signal into a binary value of "0" or "1", samples the converted signal, and outputs a random access memory. After storing in the (RAM), a digital waveform as shown in FIG. 5 is displayed on the display screen. In this case, a time axis is set in the horizontal direction of the screen, the vertical direction of the screen is set as the channel direction, and digital waveforms for a plurality of channels are sequentially displayed so that a plurality of channels can be displayed at the same time. In this case, depending on the size of the display device and the display resolution, the number of channels that can be displayed on the screen at one time is about 16 channels.

By the way, in recent years, logic analyzers have been advancing toward multi-channels, and demands for more than 100 channels have been demanded. Therefore, conventionally, in the screen display in FIG. 5, a method of scrolling the display channels in the vertical direction of the screen so that all the channels can be viewed, or as shown in FIG. How to write (Japanese Patent Application No. 61-21987)
No. 0, Japanese Patent Application No. 63-295970, etc.) or by using special symbols as shown in FIG. 7, many channels are expressed by a display device having the same size and the same resolution. A method (see Japanese Patent Application No. 57-184978, etc.) has been proposed.

In a personal computer,
When performing various kinds of processing, in order to make the processing easy to understand, as shown in FIG. 8, there is a function called a multi-window that displays a plurality of processing screens at arbitrary positions and in arbitrary sizes at one time. There is also a method of using this to perform multi-channel display.

[0005]

However, among the methods for displaying multiple channels in the conventional waveform display device,
With the method of scrolling the display screen, the number of channels that can be observed at one time is determined, and many channels cannot be observed at one time. Further, in the case of the method of writing waveforms in a superposed manner, detailed measurement is difficult. Further, in the case of using the special symbol, it takes time to understand the actual data from the displayed waveform image.

On the other hand, when many channels are displayed by using the multi-window, the software becomes complicated and the actual operation becomes complicated.

The present invention eliminates the above-mentioned conventional drawbacks,
Another object of the present invention is to provide a waveform display device capable of displaying many channels at the same time with simple software.

[0008]

In order to solve this problem, the present invention provides a method of displaying waveforms of a plurality of channels side by side in a direction orthogonal to a time axis direction in one direction of the display screen. While dividing the screen in the time axis direction, the captured waveform data of the plurality of channels is divided into blocks for each arbitrary number of channels, and the waveforms of the plurality of channels of this divided block are divided into blocks.
The images are sequentially displayed in the screen area divided in the time axis direction.

Further, the waveform display device according to the present invention has a display means 7 for displaying waveforms of a plurality of channels side by side in a direction orthogonal to the time axis direction in one direction of the display screen.
A memory means 5 including a real screen memory section 5B into which data corresponding to the display contents of the display screen is written; and a virtual screen memory section 5A, a waveform data capturing means 10 for capturing waveform data of a plurality of channels, and The virtual screen creation processing unit 2A that sequentially writes the waveform data from the waveform data acquisition unit 10 to the virtual screen memory unit 5A of the memory unit 5 and the waveform data of a plurality of channels written in the virtual screen memory unit 5A are set to arbitrary channels. A real screen creation processing unit that divides each number into blocks and sequentially writes the waveforms of a plurality of channels of each divided block into an area of the real screen memory unit 5B divided in a direction corresponding to the time axis direction of the display screen. 2B and waveform data are read from the real screen memory section 5B of the memory means 5 and displayed on the display screen of the display means 7. And a display control unit 6 to perform.

[0010]

The waveform data for a plurality of channels captured by the capturing means 10 is processed by the virtual screen creation processing means 2A.
Thus, the virtual screen data is created by arranging them in a vertical line.

The real screen creation processing means 2B divides this virtual screen into blocks of an arbitrary number of channels, and rearranges the divided blocks from the vertical position to the horizontal direction, as shown in FIG. To create real screen data. With this configuration, if you scroll the waveform trace, if you scroll on the virtual screen, on the real screen,
All blocks scroll together.

When the cursor is moved on the virtual screen, the cursor on each block moves in conjunction on the real screen.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of a waveform display device according to the present invention, which is an example of a logic analyzer using a microcomputer.

In FIG. 2, 1 is a CPU, 2 is a program ROM, 3 is a work RAM, and 4 is a data bus.
Further, 5 is a video RAM, 6 is a CRT controller, and 7
Is a CRT display. In this example, waveforms are displayed side by side on the screen of the CRT display 7 with the horizontal direction of the screen as the time axis direction and the vertical direction orthogonal thereto as the array direction of the waveforms of a plurality of channels.

A keyboard 8 is connected to the data bus 4 via an interface 9. Reference numeral 10 is a waveform measuring unit, which is also connected to the data bus 4 via the interface 11.

The waveform measuring section 10 takes in a signal from the circuit under measurement, forms digital waveform data, and stores it in a data storage section (acquisition memory) 10M. Video ram
5 has a virtual screen memory unit 5A and an actual screen memory unit 5B. In the virtual screen memory unit 5A, waveform data of a plurality of channels are sequentially written in the vertical direction of the screen as in the conventional case. Data to be actually displayed on the screen of the CRT display 7, which will be described later, is written in the real screen memory section 5B.

The program ROM 2 includes a video RAM 5
Virtual screen creation processing program 2A for writing virtual screen data in the virtual screen memory unit 5A, and a video RAM
5, a real screen creation processing program 2B for creating real screen data from the virtual screen data in the virtual screen memory unit 5A and writing the real screen data in the real screen memory unit 5B.

FIG. 1 is a block diagram for functionally explaining the operation of the apparatus of the example of FIG. 2 focusing on the flow of waveform data and display control information. The operation of this example will be described below with reference to FIG.

That is, the multi-channel waveform data captured by the measuring unit 10 is stored in the waveform data storage unit (capture memory) 10M. The data in the capture memory 10M is recorded in the video RA by the CPU 1 executing the program 2A for the virtual screen creation processing in the ROM 2.
As shown in FIGS. 1 and 3A, the virtual screen memory unit 5A of the M5 is arranged such that channels are taken in the vertical direction and time is taken in the horizontal direction. Written to create a virtual screen.

In this case, when the number of screen divisions in the time axis direction, which will be described later, is m, and the waveform time that can be displayed in the horizontal direction of the display screen is T, as shown in FIG. / M time is written as data of the virtual screen. In the case shown in the figure, the time of T / 3 is written.

Next, the CPU 1 executes the program 2B for real screen creation processing. By this real screen creation processing, the data of the virtual screen is divided into blocks for each arbitrary n (n is an integer of 2 or more) channels. In the example of FIG. 1, it is divided into 3 blocks. Then, as shown in FIGS. 1 and 3B, in the horizontal direction of the screen which is the time direction, the waveform data of the block is next to the block, the waveform data of the block is next to the block, and so on. Written in. In this way, the blocks 1 to 3 arranged in a line in the vertical direction are expanded in the horizontal direction, and the actual screen data is created.

Next, the actual screen data is transferred to the CRT display 7 via the CRT controller 6 and displayed. The number of channels included in one block is
When the maximum number of display channels in the vertical direction of the screen is reached, it is possible to display the number of display channels that is m times the number of screen divisions of the maximum number of display channels in the vertical direction of the screen. Can be displayed. In addition,
When the number of channels included in one block is less than the maximum number of display channels in the vertical direction of the screen, the remaining portion in the vertical direction of the screen is similarly displayed in waveforms in block units divided in the time axis direction. be able to.

At the time of this waveform display, a command for channel scroll information, cursor information, and screen division information is input to the CPU 1 from the keyboard 8. The channel scroll information indicates the position (address) of the leading data to be fetched when fetching the data from the fetch memory 10M in the process of creating the virtual screen. That is, when the channels are scrolled, the channels captured on the virtual screen are scrolled, and the channels included in each divided block are sequentially changed. Therefore,
Even in the divided screen, when the channel is scrolled, the blocks, the blocks, and the contents of the blocks are scrolled in association with each other, as shown in FIG. 3C. Also,
Similarly, when the waveform is moved in the time direction, the waveform moves in the same way in each block.

The cursor information is used in the virtual screen creating process, and the cursor CU is added on the virtual screen data as shown by the broken line in FIG. As shown in FIGS. 3B and 3C, one cursor CU written on this virtual screen is displayed in each block on the real screen, respectively. Then, at this time, when the cursor CU is moved to CU ′ on the virtual screen as shown in FIG. 3A, the cursor CU of each block is linked to CU ′ on the real screen as shown in FIG. Will be moved to.

The screen division information is division information when virtual screen data is converted into real screen data, and represents data when no division is performed and an arbitrary division number m (m = 3 in this example).

In this way, many channels can be displayed simultaneously with simple software.

If there is not enough RAM area to create the virtual screen data, the virtual screen is not created and a plurality of screen data linked with the channel scroll and the time axis scroll are directly extracted from the waveform data to obtain the actual data. You may create screen data.

[0028]

As described above, according to the present invention, the display screen is divided in the time axis direction of the waveform, and
Since the waveforms of a plurality of channels are displayed in each divided screen area, the waveforms of many channels can be displayed simultaneously. Then, since the cursor information is added on the virtual screen, the cursors are displayed at the corresponding positions on the waveforms of the divided blocks on the real screen, and if the cursors are moved, they are linked in each block. The cursor moves. Moreover, according to the present invention, there is an advantage that the above waveform display device can be realized with simple software.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a waveform display device according to the present invention.

FIG. 2 is a functional block diagram for explaining the operation of the embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the present invention.

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a diagram for explaining an example (scroll) of a multi-channel display method of a conventional waveform display device.

FIG. 6 is a diagram for explaining another example (overwriting) of the multi-channel display method of the conventional waveform display device.

FIG. 7 is a diagram for explaining another example (special symbols) of the conventional multi-channel display method of the waveform display device.

FIG. 8 is a diagram for explaining a screen display method (multi-window) of a microcomputer.

[Explanation of symbols]

 1 CPU 2 Program ROM 2A Virtual screen creation process (program) 2B Real screen creation process (program) 5 Video RAM 5A Virtual screen memory unit 5B Real screen memory unit 6 CRT controller 7 CRT display 8 Keyboard 10 Waveform measurement unit

Claims (3)

[Claims] 1. A direction of a display screen is defined as a time axis direction,
In a method of displaying waveforms of a plurality of channels side by side in a direction orthogonal to this, the display screen is divided in the time axis direction, and the acquired waveform data of the plurality of channels is divided into blocks by an arbitrary number of channels. And divide the waveform of multiple channels of this divided block into
A waveform display method for displaying in a screen area divided in the time axis direction. 2. One direction of the display screen is defined as a time axis direction,
Display means for displaying waveforms of a plurality of channels side by side in a direction orthogonal to this, memory means having a real screen memory section in which data corresponding to display contents of the display screen is written, and a virtual screen memory section; Means for fetching the waveform data of, and a virtual screen creation processing means for sequentially writing the fetched waveform data of each channel into the virtual screen memory section of the memory means, and the waveforms of the plurality of channels written in the virtual screen memory section. The data is divided into blocks by an arbitrary number of channels, and the waveforms of a plurality of channels of each divided block are sequentially divided into regions of the real screen memory unit divided in a direction corresponding to the time axis direction of the screen. The real screen creation processing means for writing, and the waveform data read from the real screen memory section of the memory means, Waveform display apparatus and a display control means for performing waveform displayed on the display screen of the unit. 3. A means for generating a cursor for designating a time axis position on a waveform on the virtual screen data of the virtual screen memory section, and the waveform data with the cursor added is provided in the real screen memory section. The waveform display device according to claim 2, wherein the waveform display device is configured to be written in.