JP2002190059A - Controlling device for vending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controlling device for a vending machine capable of easily and flexibly performing rewriting of a control program or addition of a function. SOLUTION: A second interrupt table 32 describing a shift command to interrupt programs 34a and 34b is arranged in a ROM 3, while in a first interrupt table 31, an address of the second interrupt table 32 is described as a shift destination address of interrupt processing. The control program 34 is rewritten when the second interrupt table 32 is rewritten. In this way, the control program can be flexibly designated and developed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vending machine control device.

[0002]

2. Description of the Related Art A control device for a vending machine of this kind includes a memory storing a control program for driving a controlled device such as a compressor, and a CP for performing arithmetic processing on the control program.
U. The memory is provided with an interrupt table that stores the start address of an interrupt processing program that processes the interrupt when a hardware or software interrupt is requested to the CPU. FIG. 5 shows a memory map of a memory in the conventional control device. As shown in FIG. 5, the memory 100 stores an interrupt table 11
0 and a control program 120 are stored. The control program 120 includes a main program 121 and an interrupt processing program 122 for performing an interrupt processing. Some of the addresses stored in the interrupt table 110 are the head addresses of the respective interrupt programs 122. Note that the address stored in the head area of the interrupt table 110 indicates the head address of the main program 121. An interrupt referring to this address is generally called a reset interrupt, and when the control device is reset, the processing of the arithmetic unit is shifted to the address.

[0003]

Incidentally, there are cases where this kind of vending machine rewrites the control program 120 for adding functions or changing specifications after it is installed in the market. For this reason, an EEPROM that is an electrically rewritable nonvolatile storage device is used as the memory 100. In the memory 100, the storage area is divided into several blocks, and storage contents can be erased and written in block units.

[0004] However, rewriting of the memory 100 does not always succeed, and rewriting may fail. In particular, if the rewriting fails while rewriting the memory 100 so as to overwrite the already stored interrupt table 110, the control device may run away. For this reason, it is desirable that the rewriting of the interrupt table 110 is not performed as much as possible. However, without rewriting the interrupt table 110, the control program 12
If you try to rewrite only 0, the interrupt processing program 1
Since the arrangement of the 22 is fixed, there is a problem that the flexibility of rewriting is lacking.

On the other hand, there is a case where another program is stored in the memory 100 for a test or the like separately from the control program 120 and is executed. However, since it is difficult to rewrite the interrupt table 110 as described above, it is necessary to create a new program that does not use the interrupt processing, and there is still a problem of lack of flexibility.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vending machine control device that can easily and flexibly rewrite control programs and add functions. To provide.

[0007]

In order to achieve the above object, according to the present invention, a control program for driving a controlled device such as a compressor and an address including a transfer destination address of a calculation process for an interrupt request are provided. A storage device storing the first interrupt table and, when the control program is executed and an interrupt request is issued, the process is shifted to a destination address corresponding to the interrupt request based on the first interrupt table A control device for the vending machine having an arithmetic device for causing the storage device to store an instruction to shift processing to an address at which an interrupt processing program included in the control program is stored. With an interrupt table,
It is proposed that the transfer destination address of the first interrupt table includes the address of the second interrupt table.

According to the present invention, when an interrupt request occurs,
The arithmetic unit refers to the first interrupt table and shifts the processing to the destination address corresponding to the interrupt request. Here, the transfer destination address is an area in which the second interrupt table is stored. Since the second interrupt table describes an instruction to shift to the interrupt processing program, The processing of the device is transferred to the interrupt processing program. Therefore, when changing the storage address of the interrupt processing program, the second interrupt table can be changed without rewriting the first interrupt table.
Need only be rewritten. This allows
Without rewriting the storage area of the first interrupt table,
In addition, since the control program can be rewritten without worrying about the location of the interrupt processing program, the control program can be designed flexibly. Further, by storing a new interrupt processing program and rewriting the second interrupt table with the address of the interrupt processing program, it is possible to easily add functions and perform temporary processing. As described above, according to the present invention, it is possible to easily and flexibly rewrite the control program and add functions.

According to a second aspect of the present invention, in the control device for a vending machine according to the first aspect, the control program includes an interrupt processing program that includes a destination address included in the second interrupt table. Is included which includes an interrupt table rewriting program that rewrites the address to the stored address.

According to the present invention, by executing the interrupt table rewriting program at the time of initial operation of the control program or immediately after rewriting, the interrupt processing at the time of operation of the control program is performed by its own interrupt processing program. Therefore, the operation of the control program can be ensured.

According to a third aspect of the present invention, in the control device for a vending machine according to the second aspect, the interrupt table rewriting program is executed at an initial processing of the control program. We propose one that is characterized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for a vending machine according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a control device of a vending machine, and FIG. 2 is a memory map of the control device.

As shown in FIG. 1, a control device 1 includes a CPU 2 as a main processing unit, a ROM 3 as an electrically rewritable nonvolatile memory, and a RAM 4 as a volatile memory.
And an input / output unit 5 which is an interface unit with various devices
And a bus 6 connecting these. In the present embodiment, as the ROM 3, a flash memory capable of erasing and writing stored contents in block units is used. Further, a card interface 7 which is an interface with the memory card 11 is connected to the bus 6. A memory card 11 is detachable from the card interface 7. When the memory card 11 is mounted on the card interface 7, the memory card 11 forms a part of the memory space for the CPU 2. The input / output unit 5 is connected to devices such as the compressor 21 and the controller 22 that exchange various signals with the control device 1. In FIG. 1, devices other than the compressor 21 and the controller 22 are not shown.

As shown in the memory map of FIG.
3 includes a first interrupt table 31, a second interrupt table 32, a management program 33, and a control program 34.
Are stored.

The first interrupt table 31 stores a plurality of addresses to which processing for the interrupt is referred to when a hardware or software interrupt is requested to the CPU 2. I have. One of the transfer destination addresses is a transfer destination address for processing for a reset interrupt generated at the time of initializing the CPU 2, and the address is an execution start address of the management program 33. Some of the transfer destination addresses of the first interrupt table 31 indicate the addresses of the second interrupt table 32.

The second interrupt table 32 stores the CP transferred by referring to the first interrupt table 31 in response to the interrupt request.
A program for shifting the processing of U2 to interrupt programs 34b and 34c described below corresponding to the interrupt request is further described. Specifically, the interrupt program 34
A jump instruction including a destination address to b and 34c is described. If no processing is performed for the interrupt request, an interrupt return instruction is described. This is a preliminary program considering the case where the current control program 34 does not perform the process for the interrupt but wants to process the interrupt in the future.

The management program 33 includes a control program 3
This is a program for performing processing other than the processing performed in step 4, and mainly controls rewriting of the control program 34 and the like. Specifically, the management program 33 stores the control device 1
A function to check whether the control program 34 exists when a reset interrupt request is issued, such as during an initial operation of
If the control program 34 does not exist as a result of the check, or if the controller 22 instructs the control program 34 to be rewritten, the controller 22 has a function of reading the control program from the memory card 11 and storing it.

The control program 34 is a program for controlling each device of the vending machine.
4a and interrupt programs 34b and 34c.
The interrupt programs 34b and 34c are programs that are processed when a hardware interrupt or software interrupt is requested to the CPU 2, and each program ends with an interrupt return instruction. The main program 34a includes an interrupt table rewriting program 34d for rewriting the second interrupt table 32. The interrupt table rewriting program 34d rewrites a jump instruction to the interrupt program described in the second interrupt table 32 so as to be a jump instruction to the execution start address of the interrupt programs 34b and 34c. And operates as an initialization program in the main program 34a.

In such a control device 1, a control program 34 is normally operated. The control program 3
In the operation of the main program 34a, when a hardware interrupt or software interrupt request is issued to the CPU 2, the transfer destination address described in the first interrupt table 31 corresponding to the interrupt request is sent to the transfer destination address. Processing shifts. If the transfer destination is in the second interrupt table 32, the jump instruction described in the second interrupt table 32 is used to further process the interrupt programs 34b and 34c included in the control program 34. Is migrated. When the processes in the interrupt programs 34b and 34c are completed, the process returns from the interrupt and shifts to the process of the main program 34a.

Next, the control program 3 of the controller 1
4 will be described with reference to the flowchart of FIG. Here, a case will be described in which a new control program 11a is stored in the memory card 11 in advance, and the control program 34 currently stored in the ROM 3 is rewritten by the control program 11a. The new control program 11a includes a main program including an interrupt table rewriting program and an interrupt program, similarly to the control program 34.

First, when the memory card 11 is inserted into the card interface 7, a hardware interrupt occurs.
The CPU 2 refers to the first interrupt table 31 in response to this interrupt request and shifts the processing to the management program 33 (step S1).

Next, the management program 33 erases the block of the ROM 3 in which the control program 34 is stored, and then reads a new control program 11a from the memory card 11 and stores it in the area where the control program 34 is stored. The new control program 11a is written (step S2). As a result, the control program 34 is rewritten with a new one. And the management program 33
Transfers the process to the rewritten control program 34.

Next, the rewritten control program 34
Is an interrupt table rewriting program 34d
To rewrite the second interrupt table 32 (step S3). Hereinafter, the control program 34
By executing the main program 34a, the control of the vending machine is started.

As described above, in the control device 1 according to the present embodiment, the control program 34 is rewritten and the second interrupt table 32 is rewritten during the initial operation of the new control program 34. And the new control program 34 may have a different address of the interrupt program. That is, the new control program 34
When designing / developing, flexible design / development becomes possible without worrying about the size and arrangement of the main program and the interrupt program.

When the control program 34 is rewritten, it is not necessary to rewrite the first interrupt table 31, so that runaway of the CPU 2 can be prevented even if the rewriting fails. That is, even if the rewriting has failed, if the control device 1 is reset, a reset interrupt occurs and the management program 33 is executed, and a predetermined operation can be performed by the management program 33.

Next, the operation when the control device 1 executes the temporary program will be described with reference to the flowchart of FIG. Here, the execution of the temporary program includes, for example, a case where the operation of the improved interrupt program is confirmed in an actual control device.
In the present embodiment, a case will be described in which another interrupt program 11b obtained by improving the interrupt program 34b is stored in the memory card 11, and the operation of the interrupt program 11b is confirmed.

First, when the memory card 11 is inserted into the card interface 7, a hardware interrupt occurs.
The CPU 2 transfers the processing to the management program 33 with reference to the first interrupt table 31 in response to the interrupt request (step S11).

Next, the management program 33 reads another interrupt program 11b from the memory card 11 and
The data is written in the empty area of M3 (step S12).

Next, a second process for shifting the processing to the interrupt program 34b corresponding to the other interrupt program 11b
After having evacuated the interrupt table 32 once to an empty area,
The jump instruction to the interrupt program 34b in the second interrupt table 32 is rewritten to a jump instruction to the execution start address of another interrupt program 11b stored in the ROM 3 (step S13).

Then, the management program 33 shifts the processing to the control program 34 and starts the test (step S1).
4). Here, since the second interrupt table 32 is rewritten, when the control program 34 is executed, if there is an interrupt request for the interrupt program 34b, the other interrupt program 11b is executed instead of the interrupt program 34b. Is done. That is, it is possible to perform a process in which a part of the interrupt program 34b is replaced with another interrupt program 11b without modifying the control program 34 stored in the ROM 3.

Finally, when the test of the other interrupt program 11b is completed, an interrupt is generated by using the controller 22, the processing is transferred to the management program 33, and the second interrupt stored by the management program 33 is saved. The loading table 32 is returned.

As described above, in the control device 1 according to the present embodiment, the jump instruction to the address of the interrupt programs 34b and 34c included in the control program 34 is described in the second interrupt table 32. By rewriting this address, the interrupt programs 34b and 34c
Instead of this, another interrupt program 11b can be easily executed. As a result, it is possible to easily and reliably perform a test of the improved interrupt program, add a new function to the interrupt program, and the like.

As described above, according to the control device for the vending machine according to the present embodiment, the interruption program 34 can be used without rewriting the storage area of the first interruption table 31.
control program 3 without worrying about the arrangement of b and 34c
4 can be rewritten, the control program 34
Can be designed flexibly. Further, by newly storing the interrupt programs 34b and 34c and rewriting the second interrupt table 32 with the addresses of the interrupt programs 34b and 34c, it is possible to easily add functions and perform temporary processing. it can. That is, it is possible to easily and flexibly rewrite the control program 34 and add functions.

Although the embodiment of the present invention has been described above, the present invention is not limited to this. For example, in the present embodiment, the other interrupt program 11b is written from the memory card 11 to the free area of the ROM 3, but the jump instruction of the second interrupt table 32 is sent to the memory card 11 while the memory card 11 remains in the memory card 11. 11 may be rewritten as a jump instruction to the execution start address of another interrupt program 11b.

In this embodiment, a memory card which is a detachable storage medium and forms a part of a memory space for the CPU is used as a means for introducing a new control program or another interrupt program. However, the present invention is not limited to this. That is, a storage medium that does not form a part of the memory space and can be accessed via a predetermined interface may be used. Further, the storage medium may be another medium such as a floppy (registered trademark) disk. Furthermore, by providing a communication interface,
Various programs may be introduced from an external device such as a personal computer. In this case, by connecting the control device of the vending machine and the external device via a network, it is possible to operate from a remote place such as a management center.

[0036]

As described above in detail, according to the first aspect of the present invention, when the storage address of the interrupt processing program is changed, the first interrupt table can be rewritten without changing the first interrupt table.
Only the second interrupt table needs to be rewritten. Thus, the control program can be rewritten without rewriting the storage area of the first interrupt table and without worrying about the location of the interrupt processing program, so that the control program can be designed flexibly. it can. In addition, by storing a new interrupt processing program and rewriting the second interrupt table with the address of the interrupt processing program, it is possible to easily add functions and perform temporary processing. As described above, according to the present invention, it is possible to easily and flexibly rewrite the control program and add functions.

According to the second aspect of the present invention, the interrupt processing during the operation of the control program can be performed by executing the interrupt table rewriting program at the time of the initial operation of the control program or immediately after rewriting. Since the processing can be performed by the processing program, the operation of the control program can be ensured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control device of a vending machine.

FIG. 2 is a memory map in the control device.

FIG. 3 is a flowchart illustrating an operation at the time of rewriting a control program.

FIG. 4 is a flowchart illustrating an operation when a temporary program is executed.

FIG. 5 is a memory map in a conventional control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control device, 2 ... CPU, 3 ... ROM, 4 ... RAM,
5 input / output unit, 6 bus, 7 card interface,
11: memory card, 31: first interrupt table, 32
... second interrupt table, 33 ... management program, 34 ...
Control program, 34a... Main program, 34b, 34
c: Interrupt program, 34d: Interrupt table rewriting program

Claims (3)

[Claims] 1. A storage device storing a control program for driving a controlled device such as a compressor and a first interrupt table including a transfer destination address of an arithmetic process for an interrupt request, and a control program for storing the control program. A vending machine control device comprising: an arithmetic unit that executes the process and, when an interrupt request is issued, shifts processing to a destination address corresponding to the interrupt request based on the first interrupt table. The apparatus includes a second interrupt table storing an instruction for shifting processing to an address at which an interrupt processing program included in the control program is stored, and a transfer destination of the first interrupt table. The control device for a vending machine, wherein the address includes an address of the second interrupt table. 2. The control program according to claim 1, further comprising an interrupt table rewriting program for rewriting a transfer destination address included in said second interrupt table to an address storing an interrupt processing program included therein. The control device for a vending machine according to claim 1, wherein 3. The vending machine control apparatus according to claim 2, wherein said interrupt table rewriting program is executed at an initial processing of said control program.