JP3666933B2 - Facsimile device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a facsimile machine.
[0002]
[Prior art]
Conventionally, when a program is stored in a read-only memory, the checksum and the like are also stored at the same time, and the operator confirms the checksum to check whether the target program is stored. It is confirmed whether all the memory to store is installed.
[0003]
Also, in case of power up or some abnormal situation, the system will calculate the checksum of the program, and if the stored checksum and the calculated checksum value are different, the system will stop working, A facsimile machine having a function of notifying an operator of a system abnormality has also been proposed.
[0004]
[Problems to be solved by the invention]
However, in the above conventional example, the system calculates the checksum only when the power is turned on or some abnormal situation occurs. Usually, a control device such as a facsimile generally uses an optically erasable EPROM as a read-only memory. In this case, if the program area is erased or destroyed for some reason, the checksum is not performed unless it is determined that the system is particularly abnormal. If the power is not turned off, the program area is destroyed twice. There was a drawback that it was not checked.
[0005]
The present invention, in the user and to prevent troubles due to an error in the control program stored in the unrecoverable ROM.
[0006]
[Means for Solving the Problems]
To achieve the above object, the present invention includes a control unit for controlling the facsimile apparatus and a communication program for performing facsimile communication in the facsimile apparatus, wherein the control unit controls the facsimile apparatus by a multitask system. A ROM for storing a control program for performing error detection means for detecting an error in the control program, and when the control means detects an error in the control program by the error detection means, There is provided a facsimile apparatus characterized in that error notification of the control program is continuously performed as a task having the highest priority over other tasks in the facsimile apparatus, and other tasks in the facsimile apparatus cannot be operated .
[0009]
【Example】
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 is a block diagram showing the configuration of the facsimile apparatus in this embodiment. As shown in the figure, the system control unit 1 is composed of, for example, a CPU and its peripheral circuits, and stores a ROM 1A for storing a control procedure (program) of the CPU in advance and a checksum of the program stored in the ROM 1A. It includes a ROM 1B for storing, and a program for calculating a checksum of the source code of this control procedure.
[0011]
The reading unit 2 includes a CCD image sensor that reads a transmission document conveyed by the document conveyance roller 2B, a DS that determines whether a document is present, a DES that determines whether a document is at a reading position, or the like.
[0012]
The recording unit 3 records an image controlled by an image control unit (not shown) on a recording sheet, for example, electrophotographic thermal transfer.
[0013]
The operation unit 4 is provided with various operation keys. In the reset state used in this embodiment, the operation unit 4 is provided with a switch that notifies the operator when the checksum is different and selects whether to output a memory list or the like. .
[0014]
The display unit 5 displays a status display, an alarm display, and the like, and is also a notification means used in this embodiment. In addition, you may comprise the operation part 4 and the display part 5 as one operation display part.
[0015]
The non-volatile RAM 6A registers communication data such as its own phone number, user abbreviation, and destination phone number, and a checksum of these data is registered. The RAM 6A uses a volatile memory backed up by a battery.
[0016]
The volatile RAM 6B stores communication data at the time of reception. The volatile RAM 6C is an image memory for storing received or read image data. In this embodiment, a volatile RAM is used as the RAM, but a hard disk may be used.
[0017]
The modem (modulator / demodulator) 7 performs modulation / demodulation of transmission / reception signals. The NCU (network control unit) 8 has a function of sending a selection signal (pulse or tone dialer), and not only performs automatic incoming call operation and line control operation by detecting a ringing tone, but also controls the system control unit 1. Then, a selection signal is sent out to the telephone line 12.
[0018]
The reset circuit 9 is a watchdog timer circuit that operates when the system clock from the system control unit 1 is stopped, and outputs a reset signal to the system control unit 1 when the power is turned on or abnormally operated.
[0019]
FIG. 2 is a diagram illustrating an operation panel on which the operation unit 4 and the display unit 5 are arranged.
[0020]
Next, the operation for notifying when the checksum is different from the calculation of the checksum of the program area in this system will be described below.
[0021]
FIG. 3 is a flowchart showing the checksum task in this embodiment. First, in step S1, the CPU of the system control unit 1 turns on the ROM 1A in the lowest task set at the lowest priority of the multitask system operated by the control program stored in the ROM 1A after the power is turned on. Calculate the checksum of the stored control program source code.
[0022]
Next, in step S2, the checksum calculated in step S1 is compared with the checksum of the source code stored in the ROM 1B in advance. Here, if they are equal, the process proceeds to step S3, and the checksum task is put into a wait state for a predetermined time using the system call of the multitask system. Thereafter, when the wait time specified in step S3 has elapsed, the process returns to step S1 to calculate the checksum described above.
[0023]
In step S2, if the checksum calculated in step S1 is not equal to the checksum data stored in the ROM 1B, the process proceeds to step S4, and a checksum error task is displayed to display to the operator that a checksum error has occurred. Start up. After startup, the checksum task ends.
[0024]
Next, a checksum error task for displaying a checksum error to an operator set to the highest priority in the multitask system will be described below.
[0025]
FIG. 4 is a flowchart showing the checksum error task in this embodiment. After the checksum error task is activated, “ROM ERROR” is displayed on the display device in step S5. And this task becomes an infinite loop after executing step S5.
[0026]
This is because, in this multitask system, other tasks cannot operate while the task set with the highest priority is activated. Therefore, if this task is set to an infinite loop, it is stored in the ROM 1A. This is because even if the program is destroyed, it does not fall into abnormal operation.
[0027]
In the above-described embodiment, the operation when a checksum error occurs in the multitask system has been described. However, the present invention is not limited to this.
[0028]
For example, even in the case of a single task system, the lowest priority for executing the checksum of the source code stored in the ROM 1A at regular intervals using the interrupt function provided in the system control unit shown in FIG. When a checksum error is calculated in the priority interrupt program, the highest priority interrupt is generated, the checksum error is displayed on the display device, and then an infinite loop is set. The effect is obtained.
[0029]
The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device.
[0030]
Needless to say, the present invention can also be applied to a case where the present invention is achieved by supplying a program to a system or apparatus.
[0031]
【The invention's effect】
As described above, according to the present invention, when an error is detected in the control program stored in the ROM that cannot be recovered by the user, the error notification of the control program continues to be performed as the highest priority task. It is possible to prevent other tasks of the facsimile apparatus from operating even when an error occurs in the control program stored in the ROM and causing an abnormal operation.
[0032]
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a facsimile apparatus according to an embodiment.
FIG. 2 is a diagram illustrating a configuration of an operation panel in the present embodiment.
FIG. 3 is a flowchart showing a checksum task in the embodiment.
FIG. 4 is a flowchart showing a checksum error task in the embodiment.
[Explanation of symbols]
1 System controller 1A Program ROM
1B Checksum ROM
2 Reading unit 2B Document transport roller 3 Recording unit 4 Operation unit 5 Display unit 6A Non-volatile RAM
6B volatile RAM
6C volatile RAM
7 Modem 8 NCU
12 Telephone line

Claims (3)

In a facsimile machine,
Control means for controlling the facsimile apparatus;
Includes a communication program for performing facsimile communication, a ROM in which the control means stores a control program for controlling the multitasking system the facsimile apparatus,
And a error detection means for detecting an error of the control program,
When an error in the control program is detected by the error detection means , the control means continues to perform error notification of the control program as a task having the highest priority over other tasks in the facsimile apparatus. A facsimile machine that prevents other tasks from operating . 2. The facsimile apparatus according to claim 1, wherein the error detection means performs error detection by calculating a checksum of a control program stored in the ROM .   The facsimile apparatus according to claim 1, wherein the error detection unit periodically performs processing for error detection when the power is turned on and / or after the power is turned on.

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