JPH03154132A - In-circuit emulator - Google Patents

Abstract

PURPOSE:To improve the development efficiency of a program by comparing the result of output expected by executing the program and the actual result of output, and controlling the execution of the program by the result of comparison. CONSTITUTION:To a conventional in-circuit emulator 18, a storage device 1 for storing in advance the result of output expected by executing a program, and a comparing device 3 for comparing the output signal 7 of the storage device 1 and a program address 13 are added, and the output signal of the comparing device 3 is inputted to a stop device 4. When the program is executed, and the value of the program address 13 outputted actually, and an expected output result stored in advance in the storage device 1 are different from each other, a signal 17 for instructing the stop of the execution of the program is outputted to a CPU 9, and the execution of the program is stopped. In such a manner, the detection of the case when the actual output result by executing the program is different from the expected output result is facilitated, and the development efficiency of the program is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-circuit emulator used for developing programs to be executed on a microcomputer.

[Summary of the Invention J This invention provides an in-circuit emulator used for developing a program to be executed on a microcomputer, and a storage device that stores in advance the output results expected from program execution, and the contents of the storage device. , a means for comparing the actual output results of program execution, and a means for controlling the program execution and controlling the device based on the comparison results. This improves the development efficiency of programs to be executed.

[Prior Art] Conventionally, as shown in FIG. 2, a program is executed using a CPU 9 for an in-circuit emulator, a program address 13 which is an output signal of the in-circuit emulator, and a program memory 10 addressed by the program address 13 and outputting program data 14. Also, the program address 13 and
A comparison device 12 that compares the output signal 15 of the storage device 11 that stores the value of the program address to be stopped in advance.
An in-circuit emulator has been known which includes a stop device 4 to which an output signal 16 of the comparison result is connected and outputs a signal 17 instructing the in-circuit emulator CPU 9 to stop program execution.

[Problems to be Solved by the Invention] However, the conventional in-circuit emulator with the configuration shown in FIG. The disadvantage is that it is difficult to detect.

[Means for Solving the Problems] In order to solve the above problems, the present invention compares the expected output result of program execution with the actual output result of program execution, as shown in FIG. However, the configuration is such that it is possible to control program execution and control the device based on the comparison results.

[Function] As shown in Figure 1, the expected output result from program execution and the actual output result from program execution are compared, and based on the comparison result, program execution and device control can be performed. An in-circuit emulator with a possible configuration can easily detect when the actual output result of program execution differs from the expected output result, which improves the efficiency of program development using the in-circuit emulator. .

[Embodiment 1] An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a configuration diagram of an in-circuit emulator. In FIG. 1, a conventional in-circuit emulator 18 includes a storage device 1 for storing in advance output results expected by program execution, a device 2 for outputting a signal 6 to control the output results, and a device 2 for outputting a signal 6 to control the output results expected by program execution. A comparator 3 is added that compares the output signal 7 of the storage device, which stores the output result in advance, with the program address 13. The control I device 2 is connected to the in-circuit emulator CPU 9 via a control signal 5, and the output signal 8 of the comparator 3 is connected to the stop device 4.

Below, more detailed embodiments of the present invention will be described based on FIGS. 3 and 4. FIG. 3 is a diagram of an in-circuit emulator. FIG. 3 shows FIG. 1 in detail. In FIG. 3, it is assumed that the program memory 1o stores a program as shown in FIG. When the program is executed from address 0, the value of program address 13 is 0, l, 2.3.4.0.1.2.
It is expected that... This expected output result is stored in advance in the storage device l.

Each content 2 for address 19 of storage device 1
0 is the expected output result.

The address of the storage device I is addressed by the output signal 6 of the control device 2. The control device 2 is composed of an up counter or the like whose contents increase by 1 when the program executes one step. Pulse 5 for counting is output from the in-circuit emulator CPU 9.

The comparison device 3 compares the output signal 7 of the storage device I with the program address 13. The output signal 8 of the comparison circuit is
Together with the output signal 16 of the comparison device 12 of a conventional in-circuit emulator, it is input to the stop device 4. A stop device 4 and a signal 17 instructing to stop execution are output to the in-circuit emulator CPU 9.

In the in-circuit emulator shown in FIG. 3 configured in this way, if there is an error in the content of the program, the program is executed and the value of the program address 13 actually output and the value stored in advance in the storage device l are If the expected output result differs, a signal 17 instructing to stop program execution is output to the in-circuit emulator CPU 9, and the program execution is stopped.

〔Effect of the invention〕

As explained above, the in-circuit emulator of the present invention can detect when the actual output result of program execution differs from the expected output result when developing a program to be executed on a microcomputer. It is easy and has the effect of improving program development efficiency.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an in-circuit emulator according to the present invention, FIG. 2 is a block diagram of a conventional in-circuit emulator, and FIG. 3 is a detailed illustration of the in-circuit emulator according to the present invention. The emulator diagram, FIG. 4, is a diagram of the contents of the program memory, by way of example. 11 ・ 12 ・ l 5 ・ l 6 ・Storage device・Storage device control device・Comparison device stop device・Count pulse・Output signal of control device・Output signal of storage device・Output signal of comparison device・For in-circuit emulator CPU Figure 1 Figure 2 Program memory Program address Program data Program execution stop signal Conventional in-circuit emulator 19...Storage device address 20...Storage device address More than content

Claims (1)

[Claims] It has a storage device that stores in advance the output results expected from program execution, and it has means for comparing the contents of the storage device with the actual output results from program execution, and controls the program execution based on the comparison results. An in-circuit emulator characterized by having a device and a means for controlling the device.