JPS61259340A - Input output control device - Google Patents

Abstract

PURPOSE:To decrease the cost of a changing work by generating a program so as to be able to separate a code and a board number in a control device which applies the microcomputer, etc. CONSTITUTION:The device handles input and output port numbers used on the control program as logical numbers and is provided with an input output port number data table 11 to correspond to the logical number and the input and output port numbers. An input output instruction word is formed at a RAM area, in accordance with the necessity, an input output port number code is obtained from the input output port number data table 11, buried to an input output port number code part, and therefore, the input output instruction code is executed. Consequently, when the port number is changed, changing can be executed only by rewriting the input output port number corresponding to the logical number equivalent to the data table 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a central processing unit C such as a microcomputer.
The following description relates to an input/output side (2) device having a CPUJ (abbreviated as "CPUJ") and storing its control program in a read-only memory C (hereinafter referred to as "rRoMJ").

[Conventional technology]

In general, input/output sections using microcomputers, etc. 1
In this case, the interface circuits required for input or output are divided into units based on the number of processing bits of a microcomputer, etc., and each unit (hereinafter, input interface circuit unit is referred to as an "input port"). or,
Each output interface circuit unit (referred to as an "output port") is assigned a unique port number.

FIG. 7 shows a general configuration example of such an input/output control device. In the figure, (1) is a C that performs arithmetic processing.
PU, (2+ is ROM in which the control program is written, (
,? ) is a writable and readable memory (hereinafter abbreviated as l"'RAMJ) for temporarily storing various data necessary when the CPU executes arithmetic processing, (ku/)~
(Hiro-n) is an input port, (s-7') ~ (!;-m)
is an output port, and (AIH) is a signal path line for coupling these units.

Figure 3 shows an example of the configuration of a control program built into the ROM (21).
) shows the entire control program stored on (eO-
/) ~ (g0-n) are input command words included in the input clause j control program for executing the input operation, (10-/)
~(so-m) is an output instruction word included in an output control program for executing an output operation.

Here, the input command codes of each input command word (Hiro0-/) to (ao-n) are all the same, and only the input port number code is different depending on the input port number to be input. Also, each output command word (30-/) ~ (so-m
) are all the same, and only the output port number code differs depending on the output port number to which output is to be made. This is a general microcomputer input/output instruction word, with one input instruction word consisting of an input instruction code and an input port number code as its operand.

This is also because one output instruction word is composed of the output instruction code and the output port number code as its operand.

Futa. Between the input command word (llo-/) ~ (ao-n) and the output command word (!rO-/) ~ (!r 0 1!l), Fi, the input/output f1111@ device shown in Fig. 1 is connected. There are various programs necessary for operation, but they are omitted.

Further, arrow A in the figure indicates the basic flow of the control program.

Next, input/output operations in the conventional input/output control device will be explained with reference to FIG. 1 and FIG.

First, the input operation is performed by the CPU (where /l is an input instruction word (qθ-
/) to (da0-n) are extracted from the ROM and executed, and as a result, the input port number corresponding to the input port number is
) is read into the CPU (/l) via the signal path line (6). Next, the output operation is performed by the CPU (/l).
PU (1) is an output instruction word (!0-/) consisting of an output instruction code and an output port number code (!rO-m)
This is done by extracting the data from eROM (2) and executing it.

As a result, the output port (
s-/) ~ (tm), data from C'PU(/l is outputted via the signal path line (6)〇〇
Problems to be Solved by the Invention] The conventional input/output control device is configured as described above.

Control programs are used for reasons such as maintaining equipment reliability, physical form constraints, and reducing product prices.

Generally, the information is written in a ROM in advance and incorporated into the device. In such an input/output control device, if it becomes necessary to change the input or output port number connected to the device for some reason, the input port number code section or output port number in the input/output instruction word in the ROM The port number code section must be changed, but since there are generally multiple commands to activate seven input or output ports in the same control program, the corresponding command must be changed in the control program. I was spending a lot of time searching for which address it was in. In addition, if there are a large number of command words that need to be changed, human errors are likely to occur during the change process, and therefore a lot of time and money are spent on confirmation tests after changing the program, and it is necessary to write the program to ROM. There were problems such as the difficulty of changing the embedded machine language level.

Furthermore, in the conventional input/output control device VC, since the control program is embedded in the ROM, it is necessary to test whether the input/output control procedure and input/output values are correct during the development test stage of the control program. , special equipment and test programs that can fully simulate all input or output leg programs, or
It is necessary to perform a so-called actual machine test in which seven input and output side leg programs are operated and confirmed using the input/output control device in which the control program is actually implemented, and the control program alone cannot be confirmed. Testing also required a great deal of effort.

This invention was made in order to solve the problems of the conventional input/output control device as described above, and it is possible to change the control program due to changing the input or output port number, and to create input/output of the control program. The purpose of the present invention is to obtain an input/output control device that can easily and reliably perform confirmation tests on procedures and input/output values.

[Means for solving problems]

In a broad sense, the input/output control device according to the present invention activates each port by configuring an input instruction word and an output instruction word using an instruction code and a port number, respectively. It is equipped with a ROM'i that allows programs to be separably generated by code and port number.

an initialization program that generates an input command subroutine and an output command subroutine in a RAM area;

An input/output port number data table for converting an input or output port number given by a logical number into a physical input or output port number, and an input/output port number data table obtained from the input/output port number data table for the above input command subroutine or output command subroutine. An input control program and an output control program that call the subroutine after setting the physical input or output port number to be used are provided in the ROM area.

[For production]

In this invention, input/output? 1iIJ 1llllll
When the device is initialized, the initial setting program is started and
An input command subroutine and an output command subroutine are generated in a RAM area, and an input control program or an inter-output side program is activated, respectively, in response to an input request or an output request that occurs thereafter.

The input port number code section of the input command word included in the input command subroutine is converted by referring to the input/output port number data table to convert the input or output port number given as a logical number into a physical input or output port number. Alternatively, it is embedded in the output port number code section of the output command word included in the output command subroutine, and then all input commands or output commands are executed by calling the subroutine.

[lol example]

Figure tJcJ shows the configuration of a control program for an input/output control device which is one embodiment gA+ of the present invention. In fig.

(-b) is a control program stored in the ROM shown in FIG.
A program generated in M(,?) and RAM area f
(10) The i program is an initial setting program that is executed first after the input/output control device is reset, and (d) is an input side (goods) program.
is the output control program, and (l/) is the input for converting the logical numbers on the control program previously assigned to all input or output ports used in this device into actual physical input or output port numbers. In the output port number table, physical input or output port number codes corresponding to the logical numbers are set in ascending order of the logical numbers. Also, (/2) is set by the initial setting program (ri).
The input command subroutine (/, 7) is created by generating an input command code and a return command code, and generating an input port number code to be input every time the input control program (?) is executed. An output command subroutine that is realized by generating an output command code and a return command code by the initial setting program (jl) and by generating an output port number code to be output every time the output sidetracking program (10) is executed.

It is.

In addition, in figures W and C, only the parts necessary for a detailed explanation of this invention are described, and various information necessary for operating the input/output control device is also shown between each program described. There are programs for this, but they are omitted here. or,
In Figure 1, the input control program (?) and output control program (/Q) are.

Although only seven of these programs are listed, there are many input/output control programs that are completely the same or differ only in the logical number value in the process of setting the logical number of the input or output port to be input or output. Furthermore, the dashed arrows in Figure 1 indicate which programs generate the codes that make up the input command subroutine (/co) and the output command subroutine (/3), and the solid arrows indicate the flow of the control program. There is.

Next, the operation will be explained with reference to FIGS.

When the input/output control device is reset, the initial setting program (ri) first writes the input command code and return command code to a specific address in RAM (,7) to form the input command subroutine (/2). Write. Next, the initial setting program (fl writes the output command code and return command code to form the output command subroutine (/, 7) to another specific address in the RAM (, 71).The above initial setting operation After this is completed, the input control program (de) or the output control program (10) is activated when an input or swinging operation is required.

First, the input operation will be explained. When an input request occurs within the input/output control device, control is transferred to the input control program (te). Here, first, set the logical number of the input port to be input, and based on this logical number, refer to the input/output port number data table (//) and select the physical input port corresponding to the logical number. Extract the port number and input it to the RAM area input command subroutine (/co)'1 &
:Write to the configured input number code section. Next, the input command subroutine (/2) f is called and control @ is passed to the input command subroutine (/2) in the RAM area. Input command subroutine (in item B), an input command word consisting of an input command code and an input port number code is executed, and data is first transmitted from the input port specified by the input port number code via the signal path line (6). It is read from the outside. Next, a return instruction is executed, and control is returned to the instruction (instruction in the ROM area) following the instruction that called the input instruction subroutine.

On the other hand, in the case of output operation, when an output request occurs inside the input/output control device, control of the output control program (#7) K is transferred. Here, first, set the logical number of the output port to be output, and based on this logical number, refer to the input/output port number data table (//) and select the physical output corresponding to the logical number. Take the port number and put it in R
AM area output command subroutine (/3) ft Write to the output port number code section.

Next, call the output command subroutine (/J) to
Transfer control to the M area output command subroutine (/3).

In the output command subroutine (/3), an output command consisting of an output command code and an output port number code is executed, and data is first sent to the output port specified by the output port number code via the signal path line (6). is output to the outside. Next, a return instruction is executed, and control is returned to the instruction (instruction in the ROM area) following the instruction that called the output instruction subroutine.

Although not shown in FIG. 1, many other input or output control programs operate in exactly the same manner as described above.

In addition, in the explanation above, we explained about changing the input or output port number, but the initial setting program (wa)
Among the processing contents of ``r'', set the input instruction code to the input instruction subroutine [/2) in the RAM area''.
Set the instruction code to branch to the program that tests the input side. ”, and output the input port number code set in the input command subroutine (/2) to a general-purpose output device, such as a printer, and output any input port number code from the general-purpose input device 1, such as a keyboard. Added a program to test a simple input such as "branch to the return instruction code part of the input instruction subroutine (/2) after inputting data", and also added a program to test the opening of a simple input such as "branch to the return instruction code part of the input instruction subroutine (/2) after inputting data". The process of ``Set the output instruction code in the area's output instruction subroutine (/J)'' was changed to the process of ``Set the instruction code that branches to the program that tests output control.'' 3) Test simple output control such as "output the output port number code set in 3) and the output data at that time to a general-purpose output device 1, for example, a printer, and then branch to the return instruction code part of the output instruction subroutine (/3)." By adding a program that does this, it is possible to check whether the input/output control procedure and input/output truth of the control program are correct. In other words, by configuring as above, each time the input system program (te) is executed and the input command subroutine (/co) is called, the input port number at that time is output to the printer etc., and the input port number is output to the keyboard. Any data can be input from etc., the output section control program (10) is executed and the output command subroutine (/3
) is called, the output port number and output data contents at that time are output to a printer, etc., so even if there is no actual input/output control device on which the control program is implemented,
Using a general-purpose computer (1) equipped with a CPU, memory, keyboard, and printer, such as an ordinary personal computer, it is possible to easily and quickly perform a confirmation test that is almost equivalent to the actual machine without preparing a special test program. It can be carried out in

Furthermore, if a dummy port is provided in the input/output section 1 device that does not perform any operation even when input or output is activated, and does not cause a program error, the logical number in the input/output port number data table By changing the input or output port number corresponding to the dummy port to the port number corresponding to the dummy port, it is also possible to restore the input/output side (capital) to a specific input or output port after it has been disabled. becomes.

〔Effect of the invention〕

As described above, according to the present invention, the input or output port number used on the control program is handled as a logical number, and the input/output port number data associates the logical number with the physical input or output port number. A table is provided and input/output commands are formed in the t-RAM area, and if necessary, physical force or output port number codes are obtained from the input/output port number data table to obtain the input or output port number of the input/output command. After embedding it in the code part, if it becomes necessary to change the port number of one or more of the input or output ports used in the input/output control device because it is configured to execute the input/output command word, By simply rewriting the physical input or output port number of the entry corresponding to the corresponding logical number in the input/output port number data table, you can change the number of input control programs and output control programs and the ROM in which they are actually stored. completely unrelated to the address.

It becomes possible to change the input or output port number in the fftllall program. Therefore, the modification work can be completed in a short time, there is no need for confirmation tests after the modification as in the past, and the cost associated with the modification work can be reduced, and the modification work can be carried out without reducing reliability.

[Brief explanation of the drawing]

FIG. 7 is a block diagram of a general input/output control device used in both the present invention and the prior art, FIG. 1 is a block diagram of a control program according to the present invention, and FIG. 3 is a block diagram of a conventional control program. . In the figure, (C is the CPU, (21 is the ROM, (,71
is RAM. (II-/)~(darn) is an input port, (k-/)~
(s-m) is the output port, (7] and (71 are the initial setting program, (te) is the input control program, Cl0)
is the output part 1 program, (//) is the input/output port number data table, (/ko) is the input command subroutine,
(/, 7) is an output command subroutine. Figure 3

Claims (2)

[Claims] (1) In an input/output control device that configures an input instruction word and an output instruction word using an instruction code and a port number, respectively, and activates each port, the input instruction word and the output instruction word are respectively stored in a RAM area and the above code and port number are configured. An input/output control device characterized in that a ROM for storing a control program has a built-in means for separably generating a program. (2) The program generating means generates an initial setting program that generates an input instruction subroutine including an input instruction code and a return instruction code in the RAM area, and an output instruction subroutine including an output instruction code and a return instruction code in the RAM area. An initial setting program to be generated, an input/output port number data table that converts an input port number or output port number given by a logical number to a physical input port number or output port number, and the input/output port number data table. After setting the physical input port number obtained from the input command subroutine to the input command subroutine, an input control program executes the input command word by calling the input command subroutine; Claim 1, further comprising: an output control program that executes the output command by calling the output command subroutine after setting the physical output port number assigned to the output command subroutine. The input/output control device described.