JPS60120453A - Processing system of received data - Google Patents

Abstract

PURPOSE:To reduce the time required for waiting data reception, by inputting a character string until a delimiter code into a buffer regardless of other processes of a processor and fetching in them at once when the delimiter code is detected. CONSTITUTION:When characters from S1 to S6 are successively fetched in and a delimiter code is inputted at the position of S7, the code is fetched into a receiving buffer after it is converted into a code and, at the same time, the counted output value of a delimiter counter becomes ''1'' and the value of ON COM GOSUB flag also becomes ''1''. Character data is fetched into the receiving buffer thereafter and two delimiter codes are inputted at the position of S9. When the two delimiter codes are inputted, the counted output value of the delimiter counter becomes ''2''. If ON COM GOSUB instruction is executed at the processor at the position of S10, a received character data inputting program is driven and a character string until the first CR code ''AB1345'' is read.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a received data processing method for inputting serial data transferred from an external processing device into a computer.

[Prior art]

With the rapid development of microcomputers, etc.

Data transfer between microcomputers and other external processing devices has become easier. For example, character data may be transferred from a large computer to a terminal microcomputer via a telephone line.

In such a case, the transfer data is serially transferred based on the R5-232C standard or the like. As a conventional example of the above received data processing method, the first @th serial data (one character)
The BASIC program is interrupted and the ONC
A common method is to jump to a branch destination defined by an OM GO3UB statement or the like and capture a specific number of character data.

An example of the operation of the conventional system will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram of a conventional received data processing system.

The serial data transferred via the serial transfer data line D1 is converted into parallel data in units of one character (one byte) at the interface section 1.
It joins the processor 2 via the data bus line B1.

A signal indicating that data for one character has been received is outputted from the I10 interface section 1, and is inputted to the received data number counter 5 via the control signal line C2, and also inputted to one input terminal of the AND gate 3.

The calculation output of the received data number counter 5 is applied to the comparator 6 via the data bus line. The comparator 6 compares the reception data setting value set by the processor 2 and butt-springed to the reception data setting value buffer 7 via the data bus line with the count output of the reception data number counter 5. If there is a match, a match output signal from the comparator 6 is input to the processor 2 via the control signal line C6.

In addition, the other input terminal of the AND gate 3 is connected to the processor 2.
The control signal line c1 from
The output signal of the gate 3 is input to the cent input terminal S of the flip-flop 4 via the control signal line C3. Further, a control signal line C5 from the processor 2 is connected to the reset input terminal R of the flip-flop 4, and the output signal of the flip-flop 4 is input to the processor 2 via the control signal line C4.

In the above system, as shown in Figure 2, A
The operation when the SIC program is executed by the processor 2 and character data is input from the outside will be explained.

First, by the COM ON command of sentence number 10, the signal output from the processor 2 to the control signal line C1 becomes high level, and is input to the AND gate 3.
Turn on D gate 3.

This makes it possible to take in serial transfer character data from the outside. Next, sentence number 20, ON COM
By executing the command GO3UB 100, the signal on the control signal line C4, which is the output of flip-flop 4, is set as a flag, and when this signal becomes high level, it jumps to statement number 100 and starts inputting the transferred character data. do. That is, when serial transfer character data is input to the I10 interface unit 1 via the serial transfer data line, and data for the first character (byte) is output from the I10 interface unit 1 to the data bus line B1, the control signal is A pulse signal is output to line C2 to notify that data for one character has been received, and
The flip-flop 4 is sent through the ND gate 3. Note that the flip-flop 4 has been reset in advance by the processor 2 via the control signal line c5. As a result, the output of the control signal line c4 goes high, so the program jumps to statement number 100 and takes in the data for the first 5- characters output to the data bus line B1. Then, the flip-flop 4 is reset via the control signal line C5. Statement number 100 A$-INPUT$ (12B,
#1) I10 port # to the character variable defined by A$
This is a command to input 128 characters of serially transferred two-character data from the outside that is inputted first. When the first character is taken in as described above in the second sentence number 100, the flip-flop 4 is immediately reset by the control signal line c5 and enters a state of waiting for the input of the third character.

Next, when two characters of serial data are input to the I10 interface unit 1 and one byte of data is output to the data bus line B1, two characters are input to the control signal line C2.
The th pulse signal is output, l'1. , AND gate 3
The output becomes high level.

Set flip-flop 4 again. This results in 2
The character data of the character is taken into the character variable A$, and the flip-flop 4 is reset again by the control (l line c5).

6- Import 128 character data while repeating the above operations. On the other hand, the AND gate 5 counts the number of character data taken in by the pulse outputted to the control signal line C2 for each character, and the received data setting value buffer 7 contains the data to be taken in specified by statement number 100. For example, the value "128" representing the number of characters is stored as a binary number. As a result, when the 128th character is fetched, a match signal is provided from the comparing section 6 to the processor 2 via the control signal line C6.

The process of importing 128 character data according to sentence number 100 is completed. And RETUR of sentence number 110
The N command returns to the second sentence number 30 and performs the next process.

[Problems with conventional technology]

In the method described above, the required number of data, for example, 12B data, is captured in units of characters. Therefore, since the signal input from the control signal line C4 is detected during the execution of this import, even if the data transfer speed of character data transferred from the outside via the serial transfer data line D1 is relatively slow (300 ~9
．． 600 bit/sec), and other processing cannot be performed until the specified number of characters (128 in the above example) has been input.

There is a problem in that the efficiency of program execution in the processor 2 deteriorates. Furthermore, if the specified number of characters is one, the ON COM GO3UB command must be executed for each input, which causes the problem that programming becomes complicated.

Furthermore, BASIC programs use delimiters such as carriages to separate character strings, but
In the conventional method as described above, the only condition for the character string to be imported is the number of characters, so a new program for determining the delimiter code must be added, resulting in a problem that the program becomes complicated.

[Purpose of the invention]

In order to eliminate the above-mentioned problems, the present invention does not import the necessary characters one character at a time, but inputs multiple character strings up to the delimiter code into a buffer regardless of other processing by the processor, and detects the delimiter code. The purpose is to reduce unnecessary data reception waiting time and increase the execution efficiency of the main program by importing all the character strings up to that point at once.

[Structure of the Invention] A feature of the present invention is that in a computer that has a serial data transfer means and executes a basic language, a detection means for detecting specific data inputted from the serial data transfer means is used to detect specific data input from the serial data transfer means. O
The present invention is a received data processing method characterized by executing an N COM branch.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below.

FIG. 3 is an overall configuration diagram of the received data processing method according to the present invention.

The serial data transferred via the serial transfer data line D1 is converted into parallel data in units of one character (one byte) by the I10 interface 9 part 1, and is output to the data bus line B5. Data bus line B5 is connected to reception code determination section 8.

A delimiter code, ie, an end code, is stored from the processor 2 into the delimiter code buffer 14 via the data bus line B9. Brimisoku Code Buffer 1
4 connects the aforementioned delimiter code to the data bus line BI.
It is added to the received code discriminator 8 via O. The reception code determination section 8 compares the aforementioned delimiter code with the reception data input from the data bus line B5, and further inputs the data input from the data bus line B5 to the reception buffer 9 via the data bus line B6. do. Further, the output of the reception buffer 9 is input to the buffer transfer control unit 10 via the data bus line B7, and the output of the buffer transfer control unit 1° is input to the processor 2 via the data bus line B8. On the other hand, if the character data code input via the data bus line B5 matches the delimiter code in the received code discriminator 8, a match signal is output to the control signal line C8, and this signal causes the delimiter counter to The count value of 12 is increased by +1. Further, a control signal from the buffer transfer control unit 10 is inputted to a count input for setting the count value of the delimiter counter 12 to -1 via a control signal line CIO, and also inputted to one input terminal of the OR gate 16. The counting output of the delimiter counter 12 is input to the "0" detection section 13 via the data bus line Bll, and the 1MO" detection section 13 detects that the counting output of the delimiter counter 12 has become zero.

The output signal of the "0" detection section 13 is input to the received code discrimination section 8 via the control signal line C14. Furthermore, the OR output of that signal and the coincidence signal from the received code discriminator 8 is input as a cent signal to the cent input terminal S of the flip-flop 11 via the control signal line C7. On the other hand, a control signal from the processor 2 is input to the buffer transfer control section 10 via the control signal line C9. Further, a set signal from the processor 2 is input to the other input terminal of the OR gate 16 via the control signal line C15.

The output of the OR gate 16 is input to the positive input terminal of the flip-flop 11. The output signal of the flip-flop 11 is input to one input terminal of the AND gate 15 via the control signal line C1l. AND gate 15
The control signal line C12 from the processor 2 is input to the other input terminal of the AND gate 15, and the output of the AND gate 15 is input to the processor 2 via the control signal line C13.

The operation of the system configured as above will be explained according to the flowchart shown in FIG. still.

In the following explanation, numbers [1] to [22] correspond to the respective processing units fa) and fbl in FIG. 4. first.

Before receiving the serial transfer character data from the serial transfer data line D1, the user sets the primordial code (1 code from 00-FF) of the received data in the delimiter code buffer 14 from the processor 2. This is done, for example, by executing an initial routine (initial setting) of the processor 2. or C described below.
This is done by executing the OM ON instruction. Similarly to FIG. 2 (conventional example), a high level signal is applied to one input terminal of the AND gate 15 via the control signal line CI2 in response to a COM ON command to turn on the AND gate 15 and make it ready for loading.

At the same time, the flip-flop 11 is reset in advance by a reset signal from the processor 2 provided via the control signal line C15 and the control signal line C16.

[1] When serial transfer character data is input from the outside via the serial transfer data line D1.

Serial data is 1 in I10 interface section 1
The data is converted into parallel data in units of characters, and transferred to the reception code determination unit 8 via the data bus line B5.

[2] The received code discriminator 8 compares the delimiter code buffered in the delimiter code buffer 14 with the transferred code 13-.

(3) (4) (5) As a result of process [2], if the received character code is not a delimiter code, transfer that character code to the reception buffer 9 and set the reception buffer address +1 for the primary input. .

The above processes [1] to [5] are repeated as long as the delimiter code is not received, and the serially transferred character data is sequentially stored into the reception buffer 9 one character at a time. During these processes, the processor 2 can continue executing the main program.

(6) (7) (8) If the received character code is determined to be a delimiter code as a result of process [2], the received code discriminator 8 converts the delimiter code to CR (
It is converted into a career turn) code, transferred to the reception buffer 9, and the reception buffer address is incremented by 1 for secondary input.

(9) (10) (11) Following the above processing, the delimiter counter 12 is sent via the control signal line C8.
+1 and sets the flip-flop 11 via the control signal 14- line C7. As a result, the output of the flip-flop 11 is changed to the control signal line C1l and the control signal line C1.
3 (AND gate 15 is turned on by a COM ON command given in advance from control signal line CI2), ON COM GO3UB
(See FIG. 2) is given to the processor 2 as a flag to enable reception, and notifies the processor 2 that reception up to the delimiter code has been completed. If the control signal line C13 is used as an interrupt line, if the control signal line C15 is on, this signal causes the processor 2 to execute the data block reception program.

Even after the delimiter code is transferred to the reception buffer 9 as an OR code through the processes in [6] to [11] above, the received character code is again transferred from the output transfer data line D1 to the I
10, the same process is repeated from process [1], and the data is stored following the above OR code.

Also, during the processing of [6] to [11] above, the processor 2 can continue to execute the processing of the main program.

While the above processing continues, the main program is
When the N COM GO3UB instruction is executed, the flag of flip-flop 11 is set, so GO3UB
Jump to the address defined next. That is, at this time, the aforementioned AND gate 15 is turned on, and the control signal line C13 notifies the processor 2 that the reception of the reception block has been completed, and the reception program of the data program is executed. When the received character data input command is executed in the subroutine starting from that address, the processor 2 executes the processing routine shown in FIG. 4(b). The operation will be explained step by step below.

[12] When the command to input received character data is executed in the processor 2, a command to transfer the data in the receive buffer is given to the buffer transfer control unit 10 via the control signal line C9.

[13] By process [12], the flip-flop 11 is reset via the control signal line CIO, the OR gate 16 and the control signal line C16, and the O
N COM GO3UB7 Reset the lag.

(14) Data bus line BT, buffer transfer control unit 10. Then, one character (byte) of data is transferred from the reception buffer 9 to the processor 2 via the data bus line B8.

(15) (16) At this time, the buffer transfer control unit 10 determines whether the above transfer data is an OR code, and if it is not an OR code, the buffer address is increased by 1 and the process returns to step [14] for the next one character. The data for 20 minutes is transferred to the processor 2.

By the above processes [12] to [16], the character data string up to the delimiter code is transferred from the reception buffer 9 to the processor 2.

(17) (1B) If it is determined that the transferred data is an OR code by processing [15], then the one-delimited (up to the delimiter) statement 17- ends the string data transfer and sets the buffer address. At the same time, the character data remaining in the reception buffer 9 is moved forward by the amount of the transferred character string.

[19] In addition to the above processing, the delimiter counter 12 is decremented by 1 by the signal outputted to the control signal line CIO in the processing [12].

(20) (21) (22) As a result of process [19], the count output of the delimiter counter 12 is “0” detection unit 13
If it is determined that it is not O in .

It is determined that the character string up to the next delimiter has already been received in the reception buffer 9, and the control signal line C is
14. Received code determination unit 8. and setting the ONCOM GO5UB flag to 1 by sending flip-flop 11 through control signal line C7.
A state is created in which the received character data input command following the next ON COM GO3UB command can be executed immediately. If the counting output of the delimiter counter 12 is determined to be 0 by the "0" detection section, it is determined that the character string up to the next delimiter has not been completely received in the reception buffer 9. By skipping process [21], ON COM performed in process [13]
Finish inputting 1-section character string data while leaving the GO3UB flag reset.

Since the above operations are performed independently of the flow shown in Figure 3 fa), the serial transfer character data is buffered one after another in the reception buffer 9 during the processing of [12] to [22] above, and the delimiter is When the code appears, the received code discriminator 8 increments the delimiter counter 12 by 1 by the number of input delimiter codes. Therefore, if the count output does not become 0 even if the delimiter counter 12 is decremented by 1 in process [19], the received code discriminator 8 again sets the ON COM GO3UB flag (flip-flop 1
1) cents. This is to notify processor 2 that the character string data up to the next delimiter code has already been received, and the primary ON COM GO3UB
When the AND gate 15 is turned on by a command, the processor 2 inputs it.

FIG. 5 shows how external character data is buffered in the reception buffer 9, the count output value of the delimiter counter 12, and the ON COM GO3UB flag value (output of the flip-flop 11).

FIG. 3 is a diagram illustrating an example of how character string data is input by the processor 2. FIG. First, at 31, the character "A" is taken into the reception buffer 9. At this time, the count output value of the delimiter counter 12 and the ON COM GO3U
Since the B flag values are both O', data input by the processor 2 is not performed. Then, characters are read one after another from 82 to S6. Then, when a delimiter code is input in S7, that code is converted to a CR code and is read into the reception buffer 9, and the counted output value of the delimiter counter 12 becomes 1'', ON by
Since the COM GO3UB flag value becomes "1", data can be input to the processor 2. Since the ON COM GO3UB instruction is not being executed at this time, processor 2 does not accept it. Thereafter, character data is taken into the reception buffer 9 one after another, and two delimiter codes are input in S9.

The count output value of the delimiter counter 12 becomes "2". Next, in S10, the processor 2 turns ON COM
When the GO3UB command is executed, the received character data input program is activated, the character string "AB1345" up to the first CR code is read, and the character string remaining in the receive buffer 9 is packed to the left end. . At this point ONC
The OM GO3UB flag value becomes O first. and S1
At 1, the delimiter counter 12 is decremented by 1, and its count output becomes "1". Since the value is not 0, ON COM
The GO3UB flag value is again set to 1". Then, when the second ONCOM GO3UB instruction is executed in the program, the character string "XX..." up to the next delimiter is
・X" is taken into the processor 2, and the reception buffer 9 becomes empty. At this time, the count output value of the delimiter counter 12 becomes "0", and the ON COM GO3UB7 lag becomes "'0'' and the secondary ON COM GOS U B instruction is executed, the signal applied to the AND gate 15 via the control signal line C11 is at a low level, so the received character data input program is not driven. .

If the control signal line C13 is used as an interrupt for the processor 2.

The received data input program becomes the interrupt processing program. At this time, the received data input program corresponds to sentence numbers 100 and 110 shown in FIG. 2, for example.

FIG. 6 is a diagram showing the timing at which received data is taken into the processor in the conventional method and the method according to the present invention. The received character data X$1 to X$11 are shown in the same figure (
When inputting through the I10 interface at a constant transfer rate as shown in A), in the conventional method, each character inputted manually is input into the processor, and the transfer rate remains constant as shown in (B) of the same figure. Since the import processing continues until data for the number of characters has been input, the processor cannot perform other processing in the main routine during that time (from ts to 22-te). In contrast, in the method according to the present invention, the input character string is stored in the receive buffer until the delimiter code (converted to an OR code) is input, and the processor performs other processing in the main routine during that time. , and once the delimiter code is input, the character string up to the OR code buffered in the receive buffer can be input in sequence at any time after that, so the interrupt time for that purpose is as shown in the figure ( As shown in C) tp+, tp2°tp3, it takes only a short time. (Note that the data transfer speed from the receive buffer to the processor is generally much faster than the serial transfer speed from the outside, so the characteristics are as shown in Figure (C).) Although one delimiter code is used, the same effect can be obtained even if the determination is made for a plurality of delimiter codes. Also, instead of simply specifying the specified code, specify the number of received characters, and when the specified number of characters is received, ON C
It is also possible to OM GO3 UB. In addition, by extracting the delimiter code and converting only that delimiter code to an OR code, etc., the conventional BA
It is also possible to import data using the SIC statement.

Furthermore, although the data input from the outside to the I10 interface section is serial transfer data based on the R3-232C standard, the same effect can be obtained even if parallel data is input in units of bytes, for example. Furthermore, CO
1 by enabling interrupts in character units with the M ON command.
The received character data is stored in the memory buffer of the processor character by character, and the received character data is enabled to drive the manual task by receiving a specific number of data or a delimiter code.
By driving the aforementioned received character data input task with the GO3UB command, it is possible to use the received data in a BASIC program and to simplify the reception control circuit, etc. Furthermore, this embodiment is applicable not only to the BASIC language but also to other high-level languages such as FORTRAN.

〔Effect of the invention〕

According to the present invention, it is no longer necessary to search for the valid data break code (delimiter code) in the received data, so there is no need for a special program for this, and when reading serial data, it is always done in units of valid data strings. can be imported.

Also, ON COM GO3UB is no longer performed in units of characters, and one interrupt time can be shortened because each delimiter is imported at a time.

It is possible to improve the execution efficiency of programs other than the reception processing routine. In addition, the processor can perform other processing of the Ikeno main program while receiving data up to the delimiter code.

[Brief Description of the Drawings] Fig. 1 is a block diagram of an embodiment of a conventional received data processing method, Fig. 2 is an example of the creation of a conventional received data processing program 25-ram, and Fig. 3 is a diagram of an example of the creation of a conventional received data processing program 25-ram. FIG. 4 (fan, fb) is an operational flowchart of the received data processing device shown in FIG. 1, FIG. 5 is an explanatory diagram of the operation of the received data processing device shown in FIG. 1, and FIG. 6 is a conventional It is a timing chart of received data acquisition time in an example and this invention. 1... I10 interface unit 2... Processor 3.15... AND gate 4.11... Flip-flop 5... Received data number counter 6... Comparison unit 7... Received data setting value buffer 8... Reception code determination section 9... Reception buffer 10... Buffer transfer control section 12... Delimiter counter 13... R0 Detection section 14... Delimiter code buffer 16... O R gate Dl...Serial transfer data line B1.B2.B3゜26- B4.B5.B6.B7.B8.B9.BIO.Bll...Data bus line CI, C2, C3, C4, C5, C6 ,C7°C8,C
9, CIO, C1l, C12, C13° C14, C15
... Control signal line patent applicant Casio Computer Co., Ltd. Representative Patent Attorney Yoshiyuki Osuga 27- Figure 2 to C0M0N 20 ON COM GO8 3゜Co Figure 3 UB to○ (+28.I1) Figure 5 ON COM GO5UB FLAG (1'/F Shiriki)

Claims (4)

[Claims] (1) In a computer that has a serial data transfer means and executes a basic language, an ON COM branch of the basic language is executed by a detection means that detects specific data input from the serial data transfer means. received data processing method. (2) The received data processing method according to claim 1, wherein the serial data transfer means transfers bit serial data. (3) The received data processing according to claim 1, wherein the serial data transfer means has a buffer for storing a plurality of data, and reads the data stored in the buffer by the ON COM branch. method. (4) The detection means includes data number detection means. 2. The received data processing method according to claim 1, wherein an ON COM branch is executed when at least one of specific data or a specific number of data is detected.