JPH06119206A - Software processing time measuring instrument - Google Patents

Abstract

PURPOSE:To measure the processing time for an interruption processing routine without using an exclusive measuring equipment and without changing the interruption processing routine concerned of an object to be measured. CONSTITUTION:By the processing of S10, an interruption becomes enable, and the processing of S11 is looped until the value of an interruption counter becomes the value of 'number of times-1 of a target interruption whose measurement is desired'. By the processing of S12, the time when the loop of the processing of S11 is finished is read and stored. By the processing of S13, processings of S13-S15 are looped until the value of the number of times of the target interruption is detected. By the processing of S16, the time when the value becomes the value of the number of times of the target interruption is read, and by the processing of S17, the difference of timer values read by the processing of S12 and the processing of S16, respectively is calculated. From this difference of the timer values, the number of times of the loop of the processings of S13-S15, and the processing time of the processing being equal to the processings S13-S15 measured in a state that the interruption becomes disenable, the processing time of the target interruption processing is derived.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a software processing time measuring device, and more particularly to a method for measuring software processing time by reading a timer value with a microcomputer.

[0002]

2. Description of the Related Art Conventionally, in a microcomputer system, the processing time of software processed by the microcomputer is measured by a dedicated measuring device,
Alternatively, measurement is performed by adding a measurement instruction to the software, and the measured processing time is used for debugging the software.

When the processing time is measured by adding a measurement command, a command for reading a timer value is set before and after the software to be measured, and the difference between the timer values read by these commands is taken for processing. The time is calculated.
In this case, the measurement target software must be modified for measurement such as adding a measurement command.

A method of measuring the processing time of software to be measured by hardware is disclosed in Japanese Patent Laid-Open No. 64-050.
No. 136 publication. In this case, the processing time is calculated from the timer value when the processing start of the software to be measured is detected by the address or instruction content and the timer value when the processing end is detected by the address or instruction content or the number of instructions from start to end. Is being measured.

When an interrupt occurs in the software to be measured, the processing time of the interrupt is also measured by a dedicated measuring device, as in the case of measuring the software processing time, or Measurement is performed by adding a measurement instruction.

The operation when a measuring instruction is added to measure the interrupt processing time will be described below with reference to FIG. First, as shown in FIG. 5A, in the process of S30 of the main routine for measurement, the interrupt is enabled and the interrupt enabled state is set. When an interrupt occurs in this state, as shown in FIG. 5B, the timer values before and after the interrupt processing routine of S34 are read in the processes of S33 and S35.

In the main routine, when it is detected that there is an interrupt in the processing of S31, the processing of S32 causes the processing of S33 and S35.
Calculate the difference between the timer values read in the processing of and measure the interrupt processing time.

As a timer used for the above measurement,
As described in Japanese Examined Patent Publication No. 3-15773,
An interval timer is used which measures a preset fixed time, and outputs a time-up completion signal when the measured time exceeds a set value.

[0009]

In the above-described microcomputer system, a dedicated measuring device is used for the interrupt processing time used for software debugging, or a measuring instruction is added to the interrupt processing routine of the measuring object. It cannot be measured unless changes such as In particular, it is troublesome to add a measurement instruction or the like to the interrupt processing routine to be measured.

Therefore, an object of the present invention is to provide a software processing time measuring device capable of measuring the processing time of an interrupt processing routine without using a dedicated measuring device or modifying the interrupt processing routine of the measurement object. Is provided.

[0011]

A software processing time measuring device according to the present invention is a software processing time measuring device for measuring a processing time of an interrupt with respect to software processing by using a timer, wherein the interrupt is prohibited. First measuring means for measuring the processing time of the software processing, and second measuring means for measuring the processing time when the interrupt occurs in the software processing,
And means for calculating the interrupt processing time from the measurement results of the first and second measuring means.

[0012]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, the CPU 1 operates by using the RAM 3 as a work area and executing a program stored in the ROM 2. The ROM 2 stores application software for measuring the processing time of the interrupt processing routine to be measured.

The CPU 1 has a factor 5 indicating some external factor.
When an interrupt occurs, the program stored in the ROM 2 executes an interrupt processing routine. When executing this interrupt processing, the CPU 1 executes the application software in the ROM 2 and measures the processing time of the interrupt processing routine. During this measurement, CP
U1 can receive the current time as data by accessing the timer 4.

FIG. 2 is a flow chart showing the initial processing of the application software executed when measuring the processing time of the interrupt processing routine. FIG. 3 is a flowchart showing the measurement process of the application software. FIG. 4 is a flowchart showing an interrupt process by the application software. The operation of the embodiment of the present invention will be described with reference to FIGS.

First, when measuring the processing time of the interrupt processing routine to be measured, the initial processing shown in FIG. 2 is performed. In this initial process, after the initial process of each variable is performed in the process of S1, the interrupt vector to be measured in the process of S2 is rewritten.

As a result, when a target interrupt occurs, the interrupt counter is counted up in the process of S20 shown in FIG. 4 and then the process jumps to the interrupt process in S21 and the target interrupt process of S22 is executed.

After the target interrupt vector is rewritten, the interrupt is disabled in the process of S3,
Disables subsequent interrupts. In this state, the current time is read from the timer 4 by the process of S4 and the time is stored.

After that, the processing of S5 to S7 is looped for a preset number of unit times A. That is, after checking whether or not the value of the interrupt counter reaches the set value in the process of S5, the loop counter is counted up in the process of S6. The process of S7 is a process of checking whether or not the counted-up value of the loop counter has become the unit number A. If the value of the loop counter has not become the unit number A, the process returns to S5.

When it is detected in the process of S7 that the value of the loop counter has reached the unit number A, the current time is read from the timer 4 in the process of S8, and the processes of S4 and S8 are executed in the process of S9. The difference between the read timer values is calculated and stored. In this case, the difference between the timer values read in the processing of S4 and the processing of S8 indicates the loop time B for the unit number A when the interrupt does not occur.

Next, the measurement process shown in FIG. 3 is performed. In this measurement process, the interrupt is enabled in the process of S10 and the subsequent interrupts are permitted. In this state, S1
The interrupt counter is checked by the process of 1, and the process is looped until the value of the interrupt counter becomes the value of "the number of desired interrupts to be measured-1". Here, the target number of interrupts to be measured is a value that defines in advance how many interrupts are measured after the first interrupt occurs.

When it is detected in the processing of S11 that the interrupt immediately before the intended interrupt to be measured is detected, S12
The current time is read from the timer 4 and the time is stored by the process.

Thereafter, the processing of S13 to S15, that is, the processing similar to the processing of S5 to S7 in FIG. 2 is looped until the value of the interrupt counter is detected to be the value of the target number of times in the processing of S13. To do. During this period, S13 to S15
A loop counter C counts the number of loops of the process (1).

When it is detected in the process of S13 that the value of the interrupt counter is the value of the target number of times, the current time is read from the timer 4 in the process of S16, and the processes of S12 and S16 are executed in the process of S17. The difference between the timer values read in each is calculated and stored. In this case, the difference between the timer values read in the processing of S12 and the processing of S16 indicates the loop time D when one interrupt is input.

By performing the above-mentioned processes, the loop time per operation is B when the interrupt does not occur.
/ A is required. If no interrupt occurs during the measurement process, the loop time E of the processes of S13 to S15 is (B / A) × C.

On the other hand, in the above process, since the interrupt is generated once, the actually measured time is D, and the loop time D and the loop time E when the interrupt does not occur are Difference, that is, D−E = D− (B /
A) × C is obtained as the processing time of the target interrupt processing in S22.

If the interrupt to be measured can be repeatedly generated, the loop count C and the interrupt count of the processes of S13 to S15 are counted, and the target interrupt process of S22 is performed based on the count result. By obtaining the processing time of, it is possible to obtain a more accurate processing time of the target interrupt processing of S22.

As described above, in the state where the interrupt is prohibited in the process of S3, the process time of the software process used when measuring the interrupt process time, that is, the process of S5 to S7 when looping by the unit number A When the loop time B is measured and the interrupt is permitted in the process of S10, the number of loops C of the process of S13 to S15 when the interrupt occurs
And the loop time D are measured, and S2 is obtained from these measurement results.
By calculating the processing time of the target interrupt processing of No. 2, without using a dedicated measuring device or changing the target interrupt processing of S22, this S2
It is possible to measure the processing time of the second interrupt processing.

Therefore, the processing time of the interrupt processing routine can be measured only by executing the application software shown in FIGS. 2 to 4 without changing the interrupt processing routine. You can debug.

[0030]

As described above, according to the present invention, the processing time of software processing measured with interrupts disabled and the processing time measured when an interrupt occurs in the software processing By calculating the interrupt processing time, it is possible to measure the processing time of the interrupt processing routine without using a dedicated measuring device or changing the interrupt processing routine of the measurement target. .

[Brief description of drawings]

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

FIG. 2 is a flowchart showing initial processing of application software executed when measuring a processing time of an interrupt processing routine.

FIG. 3 is a flowchart showing a measurement process of application software executed when measuring a processing time of an interrupt processing routine.

FIG. 4 is a flowchart showing interrupt processing by application software executed when measuring a processing time of an interrupt processing routine.

FIG. 5A is a flowchart showing a main routine executed when measuring a processing time of an interrupt processing routine according to a conventional example, and FIG. 5B is a flowchart showing an interrupt processing routine executed when measuring a processing time of the interrupt processing routine. is there.

[Explanation of symbols]

 1 CPU 2 ROM 3 RAM 4 Timer 5 factors

Claims (3)

[Claims] 1. A software processing time measuring device for measuring a processing time of an interrupt for software processing by using a timer, and a first measuring means for measuring a processing time of the software processing in a state where the interrupt is prohibited. A second measuring means for measuring a processing time when the interruption occurs in the software processing;
And a means for calculating the interrupt processing time from the measurement result of each of the second measuring means. 2. The unit processing time of the software processing is measured from the measurement result and the predetermined number of times by the first measuring means to measure the processing time when the software processing is repeatedly executed a predetermined number of times. The software processing time measuring device according to claim 1, further comprising: a calculating unit and a counting unit that counts the number of times the software process is executed before the interrupt occurs. 3. The software processing time measuring device according to claim 2, further comprising means for counting the number of times the interrupt has occurred while the software processing is being executed.