JPS63204443A - Back-up device for development of software - Google Patents

Abstract

PURPOSE:To judge the program executing situation and to facilitate the software debug, the measurement of the executing time, etc., by performing the D/A conversion of the address signals extracted from an electronic computer and displaying successively these converted address signals with the time elapse. CONSTITUTION:An input circuit 8 sends the address and strobe signals to a selector 10 based on the internal signal extracted from an electronic computer 1. The selector 10 compares those received signals with the upper and lower limit addresses set by the setting switches SW12 and 13 respectively and sends the transferred addresses to a D/A converter 17 when these addresses are smaller than the upper limit address and larger than the lower limit address. Then the converted addresses are displayed successively by a display device 6 with the time elapse. Then the selector 10 compares the transferred addresses with the values of both setting switched SW15 and 16. 1st and 2nd reference signals are outputted via amplifiers 19 and 20 when said transferred addresses are equal to the value of the SW15 and the value of the SW16 respectively. These output signals are synthesized with the analog signals given from an amplifier 18 via switches SW21 and 22 and then displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a software development support device that supports software debugging, execution time measurement, etc.

[Conventional technology]

FIG. 3 is a block diagram showing a logic analyzer conventionally used as a software development support device. In the figure, 1 is an electronic computer on which the operating status of a program executed inside the computer is observed, 2 is an input circuit that takes out the internal signals of this computer 1 without affecting it, and 6 is this input circuit. a trace memory circuit that stores the internal signal inputted through the circuit 2; 4 a trigger condition setting circuit that issues an operation χ command to the trace memory circuit 3;
Reference numeral 5 indicates a processing device formed by, for example, a microcomputer, and extracts and processes the information stored in the trace memory circuit B; 6 indicates a display device such as a CRT display for displaying the processing results of this processing device 5; and 7 &! This is an operation switch connected to the processing device 5.

Next, the operation will be explained. Electronic computer 1 in input circuit 2
More internal signals beggar, that affects internal signals? The data is taken out without being given, and inputted to the trace memory circuit 3 and the trigger condition setting circuit 4. The trigger condition setting circuit 4 compares this input signal with the trigger condition instructed by the six-control device 5, and if the two match, it issues a command to the trace memory circuit B to capture the input signal. The trace memory circuit 6 takes in the input signal according to the command from the trigger condition setting circuit 4, and stores it in a predetermined area. Next, the processing device 5 retrieves the input signal stored in the trace memory circuit B, and executes the processing χ according to the built-in program according to the conditions instructed by the operation switch 7. The results of this processing are displayed on the display device 6 as characters and waveform data.

Further, the trigger condition instruction given by the processing device 5 to the trigger condition setting circuit 4&C is carried out in accordance with the condition instructed by the operation switch 7.

[Problem that the invention seeks to solve]

Logic analyzers used as conventional software development support devices are expensive and include many functions that are beyond the scope of this invention, and their operation is complicated. Furthermore, since the signal resulting from the processing is displayed on the display device 6 in the form of characters or waveform data, there are problems in that it is difficult to immediately determine the state of program execution by looking at this display.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an inexpensive and easy-to-operate software development support device that allows the execution status of a program to be immediately determined from the display on a display device. .

[Means to solve problems]

The software development support device according to the present invention includes a selection device that selects a necessary signal from address signals taken out from an electronic computer, and a digital-to-analog conversion (hereinafter referred to as D/A conversion) of the signal selected by the selection device. ), and a display device χ that sequentially displays the D/A converted signals.

[Effect]

The software development support device according to the present invention displays the execution status of a program to be executed inside the computer by sequentially displaying the movement of the address signal taken out from the computer in analog form on a display device as time passes. Supports analysis, execution time measurement, etc.

〔Example〕

Hereinafter, a χ diagram according to an embodiment of the present invention will be described. 1st
In the figure, 2 is an electronic computer such as an 8-pit microcomputer "8085" for observing the operating status, 6 is a display device such as a commercially available oscilloscope, and 8 is an internal signal monitor of the electronic computer 1. Take it out and
An input circuit generates an address signal and a strobe signal from these signals, 9 is a switch connected to this input circuit 8, and 10 is a selection device connected to the input circuit 8. Further, 11 is connected to the input circuit 8, and 14 is an address selection circuit which selects and takes out address signals in the range specified by the upper and lower limit addresses set in the attached setting switches 12 and 13. It is also connected to the input circuit 8, and when the address signal matches the value set in the attached setting switch 15, a first reference signal is output, and when it matches the value set in the setting switch 16, the second reference signal is output. The selection device 10 is constituted by a trigger generation circuit that outputs a reference signal.

Furthermore, 17 is a D/A converter that converts the digital signal output from the address selection circuit 11 into an analog signal;
18 is an amplifier that amplifies the output χ of this D/A converter 17 and sends it to the display device 6; 19.20 is an amplifier that amplifies the first reference signal or the second reference signal; 21.22 is the amplifier 19; Or, should the output of 20 be combined with the output of the amplifier 17? This is the switch to specify.

Next, the operation will be explained. Electronic computer 1 in input circuit 8
An address signal and a strobe signal are generated based on the internal signals taken out from the selector 10 and transferred to the selection device 10.

At this point, depending on the state of the switch 9, switching is performed between the read address of the address signal sound command and the data read address. Selection device 1
The address selection circuit 11 of No. 0 compares the transferred address signal with the upper limit address set in the setting switch 12 and the lower limit address set in the setting switch 16.
ru. As a result, if the transferred address signal is smaller than the upper limit address and larger than the lower limit address, it is output to the YD/A converter 18. D/A converter 1
Reference numeral 8 converts the input address signal χD/A and sends it to the display device 6, where the analogized address signal is sequentially displayed as time passes.

Further, the trigger generation circuit 14 of the selection device 10 compares the transferred address signal with the values set in the setting switches 15 and 16, and as a result, the transferred address signal is 15, it is output to the first reference signal amplifier 19, and when it is equal to the value of the setting switch 16, it is output to the second reference signal amplifier 20. These i@1 and the second reference signal (analogized address signal from the amplifier 18 via the switches 21 and 22v) are combined and displayed on the display device 6.

The wcz diagram is an explanatory diagram showing an example of the display. The vertical axis of the display screen shows the value of the address signal, and the horizontal axis shows the time χ. In the figure, 26 indicates the analog-converted address signal sequentially displayed over time. The obtained broken line 24 visually expresses the program execution status, 24 is the first reference signal additionally displayed on this broken line 23iC, and 24 is also the second reference No. 100. Here, if the first and second reference signals do not need to be displayed, they disappear from the display screen of the display device 6 by turning off the switches 21 and 22.

Although the above embodiment shows an independent device that is connected to a display device such as an oscilloscope, it may be incorporated into another device with other functions. .

Further, in the above embodiment, the case of an 8-bit microcomputer "8085' has been described, but the present invention may be applied to other microcomputers (the same effects as in the above embodiment can be obtained).

〔Effect of the invention〕

As described above, according to the present invention, the address signal taken out from the computer is VD/A converted and is sequentially displayed in analog form on the display device as time passes.
The execution status of the program can be immediately determined from the display on the display device, which not only facilitates software debugging and execution time measurement, but also provides an inexpensive and easy-to-operate software development support device.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a software development support device according to an embodiment of the present invention, Figure 2 is an explanatory diagram showing a display example of the display device, and Figure 3 is a diagram showing a software development support device conventionally used. FIG. 2 is a block diagram showing a logic analyzer χ. 1 is the 'I left child calculator, 6 is the display device, 8 is the input circuit, 1
0 is the selection device and 11 is what is needed from the air address signal?
14 is a function for generating a reference signal (trigger generation circuit); and 17 is a D/A converter. In the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation (2 others) Figure 2 1 → X 25: No. 2 Shimafutsuki

Claims (2)

[Claims] (1) Software development that extracts address signals that specify addresses in the computer's storage device and sequentially displays them on a display device in order to observe the operating status of programs executed inside the computer. The support device includes a selection device having a function of selecting a necessary one from the address signals taken out from the computer, converts the address signal selected by the selection device from digital to analog, and converts it into analog. A software development support device characterized in that the address signal is sequentially displayed on the display device as time passes. (2) The selection device has a function of generating a reference signal based on the address signal, and displays this reference signal on the display device together with an analog signal selected from the address signal. A software development support device according to claim 1.