JPS6339018A - Data input unit - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data input device, and particularly to a device for inputting data into a computer or the like using a rotary knob.

[Prior Art and Problems to be Solved by the Invention] Many electronic measuring instruments have built-in microprocessor (μP) systems to improve signal measurement capabilities. In such i-devices, key switches are often used to set measurement conditions, control scrolling of data displays, and input alphanumeric data. Sometimes one or more key switches (eg, increment and decrement keys) are used to control parameter settings, data value changes, and scrolling operations. A disadvantage of such key switches is that they must display predetermined next data values, parameter settings, scrollable data columns, etc. 9
When the user holds the key switch in the down position, changes in data, parameter values, positions in scrollable data columns, etc. proceed continuously at a predetermined constant speed. This often results in passing over a desired data value, parameter setting, or position in a scrollable data column. The user has to start over again and adjust more slowly towards the desired point.

The disadvantage of this kind of adjustment is that if the setting progression speed is selected too slowly, it is inconvenient to set large settings or long scrollable data columns, and if it is too fast, it is difficult to accurately set each data value or each data column. This means that it will no longer be recognized. In general, such measuring instruments are very complex, so it is desired to realize a control system that can more easily perform data input and parameter setting operations. The system described in U.S. Patent No. 4.561.049 [Control System J Adopting Rotary Knob (Registered December 24, 1985) controls scrolling display, measurement condition setting, alphanumeric data input, etc. Therefore, it is driven by the operation of the manual rotation knob. This rotary knob is used to drive a mechanical switch that generates a two-pin alternating binary code in response to rotation of the knob.

This alternating binary code is applied to a regulating circuit which generates a direction signal and a clock signal for the counter.

This direction signal represents the rotation direction of the knob, and the frequency of the clock signal represents the rotation speed of the knob. The count value of the counter increases or decreases with each pulse of the clock signal depending on the state of the direction signal to represent the correct amount of rotation of the knob. The counted value of this counter is periodically read out to μP, reset, and used as the amount of change given to the stored data value. This accumulated data may represent values of setting parameters, alphanumeric input values, values for controlling scroll display, and the like.

The speed at which data is changed, ie, the speed at which new data values are entered in conventional systems, is proportional to the speed at which the user rotates the knob, making it convenient to change data values over a wide range. If the user wants to check each input value or each display position, they can simply turn the knob slowly. Furthermore, if the user already knows the desired value or wants to scroll the displayed data at high speed, the rotation speed of the knob can be increased.

Generally, while the system is operating as a data input device, the μP must constantly monitor the counter count to detect changes in knob position. This monitoring requires considerable processing time even if the knob is not in use. In many cases, control knobs are used only occasionally, so much of the μP's processing time is wasted monitoring the output of the counter. This is a problem in systems having a plurality of rotary knob input devices, and it is often necessary to provide a dedicated μP for such monitoring and control.

[Purpose of the invention]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a computer input device using a rotary knob that minimizes waste in computer processing efficiency.

SUMMARY OF THE INVENTION A system according to the present invention operates in response to actuation of a manual rotary knob to control the value of stored data.

This rotary knob is used to drive or position a mechanical switch (or photoelectric switch) that generates a 2-bit alternating binary code in response to rotation of the knob. This alternating binary code includes a direction signal and an interrupt signal. The direction signal represents the rotational direction of the knob, and the frequency of the interrupt signal represents the rotational speed of the knob. This direction signal becomes the launch's data input number δ, while the interrupt signal becomes the launch's clock input signal, so that each time the interrupt signal occurs, the current state of the direction signal is determined by the computer bus accessed by μP. latched up.

When an interrupt signal is input as an interrupt input, μP reads the direction focus data launched on the bus every time the interrupt signal is input, and changes the total displacement of the rotation control knob according to the state of the data of the direction bit. Increase or decrease the stored data representing 4. The μP reads the latched direction data in response to an interrupt signal only when the rotation control knob is driven, so there is no need to waste time monitoring the input device when the rotation control knob is not driven. do not have.

[Embodiment] FIG. 1 is a block diagram of a signal measurement system using a preferred embodiment of the present invention. The switch .alpha..omega. is a conventional mechanical switch or photoelectric switch that generates a 2-bit alternating binary code in response to rotation of a rotary knob (not shown). Switch Q[l+, shown in FIG. 1 as a mechanical switch with two contacts, operates to generate an alternating binary code in response to control of a rotary knob. The adjustment circuit side receives the alternating binary code output from switch 0 and generates a 1-bit direction signal indicating the rotation direction of the rotary knob, and generates a clock signal when the rotary knob rotates to the right or left by a predetermined angle or more. Occur. The clock signal output from the adjustment circuit becomes the clock input of latch a, which launches the state of the direction signal onto computer bus 019. The switch Om, the adjustment circuit @, and the latch (14) constitute a knob device (32). The switch α1 and the adjustment circuit are well known as disclosed in Japanese Patent Application No. 54-36194 and Utility Model Application No. 57-67435.

A measuring device such as a logic analyzer (2) measures the input signal under the control of a command signal from the computer bus αQ and outputs the measurement result to the computer bus 0[9. Control circuit (22), μP (24), continuous memory (ROM)
(26) and random access memory (RIIM)
) (28). The display control circuit (22) controls the CRT (30) in order to display the measurement results and set the values of the measuring device (211).
μP (24) is operated by software stored in ROM (26) and temporarily stores data in RAM (28).

The clock No. 13 output from the adjustment circuit is μP (24)
When this interrupt signal is input, μP (24) reads the directional focus state latched to the computer bus OI by launch 041. FIG. 2 is a signal flow diagram of the software that operates in response to the operation of the knob device (32). Tsumami ra (3
The knob interrupt processing routine (34) is called by the clock signal output in step 2). This knob interrupt processing routine (34) reads the state of the direction signal on the computer bus ae latched by latch 0 in FIG.
The value of the temporary rotational displacement data (36) of the knob written in the RAM (28) in FIG. 1.

increase or decrease. The value of the temporary rotational displacement data (36) is initially set to O at the start of this system, and this value is the relative angular displacement of the rotation knob since D was last set to O. ri, represents. The value of this temporary rotational displacement data (36) is increased or decreased depending on the state of the direction bit each time an interrupt signal is input, so the value of the temporary rotational displacement data (36) is increased or decreased depending on the state of the direction bit. The value of this temporary rotational displacement data (36) indicates the rotation angle of . When the value D1 of the temporary rotational displacement data changes from 0 to a positive or negative value as a result of driving the knob, a status update message is transferred from the knob interrupt processing routine (34) to the net displacement data update task (38), It is shown that the net rotational displacement of the knob is not zero.

When the processing of the interrupt processing routine (34) is completed, μP (24)
) resumes normal operation performing various tasks in response to messages sent to the Net Displacement Data Update Task (38). When μP (24) executes the net displacement data update task (38) in response to the status update message from the interrupt processing routine (34), the net displacement data update task (
38), the counting request message is sent to the data reading task (4).
0). After that, the net displacement data update task (
μP (24) in response to a counting request message from (38)
) executes the data reading task (40), the current value of the temporary rotational displacement data (36) is read.

is read from the RAM (28), this value is sent as a counting message to the net displacement data update task (38),
The value of the temporary rotational displacement data (36) in the RAM (28) is reset to zero. The total displacement of the knob since the start of this system is represented by the value of net displacement data (42) stored in RAM (-28).

This value D1 is initially set to O at the time of starting this system, and then when the net displacement data update task (38) is executed in response to the counting message from the data reading task (40), the net displacement data (42 ) value D7 is adjusted by the value D of the temporary rotational displacement data sent as a count message, and then the update message is sent to the output task (44
) will be sent to. This output task (44) is the task (38
), the value of the net displacement data (42) is read from the RAM (28); is used as a function control parameter of the measurement system, for example, to control scroll display, setting of measurement conditions, input of alphanumeric data, etc.

A pseudocode table for the knob interrupt processing routine (34) is shown below.

Routine (1) If Di=O, (2) Execute the following (3) Send status update message to net displacement data update task (4) End (5) Read direction signal (DIR) -(6) If DIR=1, execute the following (7) (8) Add 1 to Di (9) End (101 If DIR≠1, execute the following 0υ D, subtract 1 from (b) End α difference When the knob interrupt processing routine (34) is called by an interrupt signal from the knob device (32) that returns to normal processing, the value D8 of the temporary rotational displacement data is confirmed in the above line (1). , D8
If (21-(41 lines), the status update message is sent from the knob interrupt processing routine (34) to the net displacement update task (38) in FIG. 2. In line (5), the knob interrupt processing routine (34) reads the value DIR of the direction bit, and if the value DIR of the direction bit is in the logic state 1 in line f6) -+91, it adds 1 to the value of 1 is subtracted from the value of line 1. This knob interrupt processing routine ends at line θ1.

Below is a table of pseudocode for the net displacement data update task (38) in FIG.

Correct data Task (21) Initial setting: DR=0 (22) If the status update message is input (2
3) Execute the following (24) Send a counting request message to the data reading task (25) Wait for the counting message from the data reading task (26) Add D to D (27) Send an update message to the output task (28
) End (29) Task End The net displacement data update task (38) is the initial operation of the system, that is, the value D1 of the net displacement data is initialized to O in line (21). After that, in lines (22) to (28), the net displacement data update task checks whether a status update message is input, and if a status update message is input,
It sends a counting request message to the data reading task (40) in FIG. 2 and waits until a counting message is input from the data reading task (40). Upon receiving a count message indicating the current value of the temporary displacement data, the net displacement data update task is loaded into RAM (28). Take the value of D8, replace it with the sum of the values of l, and then execute the output task (4
4) Send an update message to. At line (29), this net displacement data update task ends.

Next, a table of pseudocode for the data reading task (40) in FIG. 2 is shown.

i2W Fake Tomohisa (31) Initial setting: D, = 0 (32) If a counting request message is input (3
3) Execute the following (34) Read D, (35) Send a counting message to the net displacement data update task (36) Setting: D, = 0 (37) End (3 days) Task end At the time the system starts The data reading task (40) is (3
1) Starting from row, initialize the value D of temporary displacement data to 0. After that, when the counting request message is input and the data reading task is called, (32) - (37)
When the row is executed, the data reading task reads the value of the temporary displacement data, sends a count message containing the value of this value to the net displacement data update task (38), and then R
Set the value D in AM(28) to 0. This task (
40) ends at line (38).

Thus, although the rotary knob-driven computer input system of the present invention allows an operator to rotate the knob to control stored data values in the computer system, the computer system detects whether the knob has been rotated. There is no need to constantly monitor stored data on counters or other external devices to do this.

Although preferred embodiments of the present invention have been described above, it will be obvious to those skilled in the art that various changes can be made without departing from the gist of the invention.

〔Effect of the invention〕

According to the input device of the present invention, since the μP operates as an input device only when the μP receives a clock signal generated by the rotation of the knob as an interrupt signal, the μP does not need to constantly monitor the rotation of the knob. Since wasteful processing time as in the conventional method can be eliminated, there is no need to provide a dedicated processor for the input device, which greatly improves the processing efficiency of μP and significantly contributes to cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a measurement system using a preferred embodiment of the present invention, and FIG. 2 is a flow diagram of the μP software that controls the value of stored data in response to the output signal of the knob device of FIG. 001, (2) is a rotation detection circuit, Q41. (24) is a processing means, and (28) is a storage means.

Claims (1)

[Claims] A rotation knob, a rotation detection circuit that generates a rotation direction signal and a clock signal according to the rotation direction and rotation angle of the rotation knob, a storage means for storing data, and a rotation detection circuit that receives the clock signal as an interrupt input every clock. and processing means for adjusting the data stored in the storage means according to the rotation direction.