JPH0561694A - Program stall generation detecting system - Google Patents

Abstract

PURPOSE:To detect a program stall by means of convensional software to which an external counter and a routine for monitoring the waiting time of interruption processing are added by providing this program stall generation detecting system with an interruption processing means, an interval timer processing means, a counter timer value setting means, a counter timer processing means, and a program stall detecting means. CONSTITUTION:The external counter is used as the counter timer processing means 4 to monitor time required from the rise of an interruption by the interval timer up to its drop and a maximum waiting time to be required from the rise of the interruption by the interval timer up to its drop is set up by the counter timer value setting means 3. The interval timer processing means 2 raises the interruption after the lapse of a fixed time, and when the interruption is raised, the interruption processing means 1 sets up an interval timer value to drop the interruption and the program stall detecting means 5 detects and processes a program stall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program stall occurrence detecting method, and more particularly to a program stall occurrence detecting method for detecting whether a stall occurs or not by using an interval timer.

[0002]

2. Description of the Related Art A program stall cannot be detected in a device without a watchdog timer.

In a device having a watchdog timer, the software had to have a routine for setting the value of the watchdog timer so that the interrupt of the watchdog timer would not be raised. It was necessary and required advanced technology.

The watchdog timer is a formal timer that raises the NMI when the next counter value is not set within a certain period of time, and the interval timer is a type of timer which raises an interrupt at regular time intervals.

[0005]

In the above-described program stall occurrence detection method, a watchdog timer is externally attached, and a routine for controlling the watchdog timer must be incorporated in conventional software, which is expensive and expensive. It was technically difficult.

[0006]

[Means for Solving the Problems] Counter timer processing means for monitoring the time until an interval timer raises an interrupt by using an external counter, and an interrupt after the interval timer raises the interrupt. Counter timer value setting means that can set the maximum waiting time that is considered to be required before dropping, interval timer processing means that raises the interrupt after a certain period of time, and set the interval timer value when the interrupt rises. It has an interrupt processing means for dropping the interruption and a program stall detecting means for detecting and processing the program stall.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 to 6 are each means 1, 2, 3, 4, 5 shown in FIG.
Is an execution flowchart of.

Referring to FIG. 1, one embodiment of the present invention comprises an interrupt processing means 1, an interval timer processing means 2, a counter timer processing means 3, a counter timer value setting means 4 and a program stall detecting means 5. ing.

When an interrupt occurs during normal processing, the interrupt processing means 1 is activated to output the interval timer value to the interval timer (step 21 in FIG. 2) and drop the interval timer interrupt signal.

The interval timer processing means 2 loads the interval timer value output by the interrupt processing means 1 (step 31 in FIG. 3) and starts counting of the interval timer. (Step 32 in FIG. 3) The interval timer counts until the interval timer value becomes 0 (step 33 in FIG. 3), and when the interval timer value becomes 0, the interval timer interrupt is raised.
(Step 34 in FIG. 3) Counter timer value setting means 3
Sets the maximum wait time, which is considered to be required from the interval timer raising the interrupt until the interrupt falls, to the counter timer value. (Step 41 in FIG. 4) When the interrupt of the interval timer occurs, the counter timer processing means 4 is activated and the counter timer value set by the counter timer value setting means 3 is loaded (step 5 in FIG. 5).
1), using a counter that monitors the waiting time of interrupt processing,
Start counting down the counter timer value. (Fig. 5
Step 52) of the counter counts until the counter timer value becomes 0 (Step 53 in FIG. 5) or the interval timer interrupts (Step 54 in FIG. 5). When the interrupt is dropped within the time set in the count timer value, the normal processing is returned to. If the interrupt does not fall within the time set in the counter timer value, an NMI is generated. (Step 55 in FIG. 5) When the program stall detecting means 5 detects the occurrence of NMI, it notifies the user of the stall of the program. (Step 61 in FIG. 6)

As described above, according to the present invention, an external counter is added by having the interrupt processing means, the interval timer processing means, the counter timer value setting means, the counter timer processing means, and the program stall detecting means. However, there is an effect that the stall of the program can be detected by the conventional software simply by adding the routine for monitoring the waiting time of the interrupt processing.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a detailed flowchart of an interrupt processing means in FIG.

FIG. 3 is a diagram showing a detailed flowchart of interval timer processing means in FIG.

FIG. 4 is a diagram showing a detailed flowchart of a counter timer value setting means in FIG.

5 is a diagram showing a detailed flowchart of the counter timer processing means of FIG.

FIG. 6 is a diagram showing a detailed flowchart of a program stall detection unit in FIG.

[Explanation of symbols]

 1 Interrupt Processing Means 2 Interval Timer Processing Means 3 Counter Timer Value Setting Means 4 Counter Timer Processing Means 5 Program Stall Detection Means

Claims (1)

[Claims] 1. A counter timer processing means for monitoring the time from when the interval timer raises an interrupt to when the interrupt drops using an external counter, and from the interval timer raising the interrupt until the interrupt drops. A counter timer value setting means that can establish the maximum waiting time considered necessary, an interval timer processing means that raises an interrupt when a certain period of time passes, and an interval timer value that sets an interval timer value when the interrupt rises and drops the interrupt. A program stall occurrence detection method comprising: an embedded processing unit; and a program stall detection unit that detects and processes a program stall.