JPH07200364A - Real time program measuring device - Google Patents

Abstract

PURPOSE:To display an execution operating state of a program in real time and easily understandable visually by displaying an address for program execution while revising a luminance, a display width and a color or the like depending on the frequency of execution of the address when the address is displayed on an longitudinal axis of a monitor screen. CONSTITUTION:An address signal 3a is latched by an address latch 5 to be an address signal 5b and converted into an analog signal by an Y axis D/A converter 10 to be a Y axis signal 10a of a CRT display device 11 and given to the CRT display device 11. An X axis signal 9a of the CRT display device 11 is a prescribed value X0. When a program is executed, the position on the Y axis of the display screen of the CRT display device 11 corresponding to the address is lighted to recognize the address executed at present. When the program is executed at a high speed, since the luminance of display changes depending on the frequency of the address at which the program is executed, the address executed by the program at present is measured in real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring instrument for displaying the operating state of a program such as a microcomputer in real time.

[0002]

2. Description of the Related Art Conventionally, a program tracer, a logic analyzer or the like has been used as a measuring instrument for analyzing a program execution operation of a microcomputer. The program tracer stores the program executed by the microcomputer in the trace memory, stops the program execution later, and reads and displays the contents of the trace memory, which is useful for analyzing the program execution operation. is there. Further, the logic analyzer is intended to analyze digital signals in the first place, but it is also possible to analyze programs by observing signals on the address bus, data bus, etc. of the microcomputer.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There is a drawback that the operation of the program cannot be monitored in real time. It is an object of the present invention to eliminate these drawbacks, display the execution operating state of a program in real time, and display it in a visually easy-to-understand manner.

[0004]

In order to achieve the above object, the present invention, when displaying an address during execution of a program at a corresponding vertical axis position on a monitor screen, according to the frequency of execution of the address, The real-time program measuring instrument is configured so that at least one of the brightness, display width, color, etc. is changed and displayed. Also, when the display moves from the display position on the vertical axis corresponding to the current address to the display position on the vertical axis corresponding to the next address, only the amount proportional to the difference between the next address value and the current address value. The real-time program measuring device is configured so as to display a locus passing through positions separated in the X-axis direction. further,
A real-time program measuring instrument is configured so that a part of the display address is enlarged and displayed by changing the display position on the horizontal axis.

[0005]

As a result, the brightness, display width, color and the like change depending on the frequency of the addresses executed by the program, so that the address currently executed by the program can be measured in real time. In addition, when the address jumps in the + direction, a display is drawn that draws a path passing through the right side position in the X axis direction, and when the address jumps in the-direction, a path that passes through the left side position in the X axis direction. In order to display the drawing, it is possible to display the flow chart that the program is executing in real time. In addition, the whole flow chart display that the program is executing,
It is possible to display both a flow chart display in which a part of the address is enlarged.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the first exemplary embodiment of the present invention. The device under test 1 comprises a microcomputer 2 and a ROM 3 in which a program for controlling the microcomputer 2 is stored. Here, by sandwiching the ROM 3 with a test clip or the like, the address signal (A ₀ ~
The A _n ) 3a, the chip enable signal (CE) 3b, and the output enable signal (OE) 3c are read from the device under test 1. Reference numeral 4 denotes the program measuring device of the present invention. The address signal 3a is latched by the address latch 5 to become the latched address signal 5b, and the Y-axis D / A converter 10
Is converted into an analog value, becomes the Y-axis signal 10a of the CRT display 11, and is input to the CRT display 11. Here, the X-axis signal 9a of the CRT display 11 is set to a predetermined constant value X ₀ .

First, the operation of FIG. 1 will be described with reference to FIG.
When the program is executed, the C corresponding to that address
The position on the Y-axis of the display screen of the RT display 11 illuminates, and the address currently being executed can be known. Further, when the program is executed at high speed, the display brightness changes according to the frequency of the addresses executed by the program, so that the address currently executed by the program can be measured in real time. In this embodiment, the brightness changes according to the frequency of the address executed by the program, but various means such as a change in the display width and a change in the display color can be considered.

Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG. 3 and the timing chart of FIG. The address latch 5 latches the address signal 3a and becomes the latched address signal 5b, which is the same as in FIG. Latched address signal 5
The address b is re-latched by the address latch signal 6a whose phase is further delayed in the address latch 6, and becomes the latched address signal 6b which is further delayed in phase. When the subtracter 7 subtracts the address signal 6b from the address signal 5b, a difference address signal 7a is generated as shown in the timing chart of FIG. When the difference address signal 7a passes through the delay circuit 8, it becomes the delayed address signal 8a, and the X-axis D
The / A converter 9 produces the X-axis signal 9a. Further, the latched address signal 6b becomes a Y-axis signal 10a by the Y-axis D / A converter 10 and is input to the CRT display 11.

The screen display state by the operations of FIGS. 3 and 4 will be described with reference to FIG. When the address jumps in the + direction due to a jump command, etc., in order to display a trace passing through a position separated in the X-axis direction in proportion to the difference between the current address value and the previous address value, X When an address jumps in the-direction by drawing a locus passing through a distant position on the right side of the axis, a locus passing through a distant position on the left side of the X axis is drawn, and the greater the difference between the jumping addresses, the greater the In order to draw a locus away from the X axis, it is possible to display the execution state of the program in a flow chart in real time.

Further, a third embodiment of the present invention will be described with reference to the block diagram of FIG. 6 and the detailed block diagram of the display range expanding means 12 in the block of FIG. The address signal 6b (represented by the symbol A _IN ) inputted to the display range expanding means 12 is a display range setting coefficient 12d (A _ST1 , A _WD1 , A).
Depending on which range of the range determined by _ST2 , A _WD2 , A _ST3 , and A _WD3 is entered, the display range enlarging means 12 causes the display range enlarging means 12 to output three kinds of output values (a coefficient K for enlarging the X-axis jump trajectory). : 12a, movement amount X _PULSE : 12b indicating the position in the X-axis direction for displaying the Y-axis enlarged signal, and Y-axis enlarged address signal D _OUT : 12C). That is,
The following processing is performed. If A _ST1 ≦ A _IN <A _ST1 + A _WD1 , then D _OUT = (A _IN −A _ST1 ) × K K = 10000 H / A _WD1 X _PULSE = X ₁ If A _ST2 ≦ A _IN <A _ST2 + A _WD2 , if D _OUT = (A _IN −A _ST2 ) × K K = 10000H / A _WD2 X _PULSE = X ₂ If A _ST3 ≦ A _IN <A _ST3 + A _WD3 , then D _OUT = (A _IN -A _ST3 ) × K K = 10000H / A _WD3 X _PULSE = X ₃

The screen display state by the operations of FIGS. 6 and 7 will be described below with reference to FIG. Address signal (A _IN ) 6b
Is included in range 1 (range of 0000H to FFFFH, but excluding range 2 5000H to 5FFFH),
The position in the X direction is displayed at the position X ₁ . Address signal
When (A _IN ) 6b is included in range 2 (5000H to 5F)
Except range FFH, except the 5C00H~5CFFH range 3), the position of the X-direction is displayed at the position of X _2. When the address signal (A _IN ) 6b is included in the range 3 (5C00
The range from H to 5 CFFH) and the position in the X direction are displayed at the position of X ₃ . This makes it possible to observe the entire flow chart of the program and the detailed flow chart at the same time.

[0012]

According to the present invention, since the operation of the program can be displayed in a flow chart in real time, the program is easy to understand visually. Therefore, the efficiency of program analysis is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a CRT display screen showing the operation of FIG.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a timing chart showing the operation of FIG.

5 is a schematic diagram of a CRT display screen showing the operation of FIG.

FIG. 6 is a block diagram showing a third embodiment of the present invention.

7 is an explanatory diagram of an operation of the display range expanding means 12 of FIG.

FIG. 8 is a schematic view of a CRT display screen showing the operation of FIG.

[Explanation of symbols]

 1 device under test 2 microcomputer 3 ROM (read only memory) 4 program measuring device 5, 6 address latch 7 subtractor 8 delay circuit 9 X-axis D / A converter 10 Y-axis D / A converter 11 CRT Display 12 Display range expanding means 13 Multiplier 14 Adder 15 Display range setting means

Claims (3)

[Claims] 1. When displaying an address during execution of a program at a corresponding vertical axis position on a monitor screen, at least one of brightness, display width, color, etc. is changed according to the frequency of executing the address. A real-time program measuring instrument characterized by displaying. 2. The next address value and the current address value according to claim 1, when the display moves from the display position on the vertical axis corresponding to the current address to the display position on the vertical axis corresponding to the next address. A real-time program measuring instrument characterized by displaying a locus passing through positions separated in the X-axis direction by an amount proportional to the difference between 3. The real-time program measuring device according to claim 2, wherein a display obtained by enlarging a part of the display address is displayed while changing the display position on the horizontal axis.