CN109189242A - A kind of key board unit and working method based on PS2 agreement - Google Patents
A kind of key board unit and working method based on PS2 agreement Download PDFInfo
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- CN109189242A CN109189242A CN201811159111.1A CN201811159111A CN109189242A CN 109189242 A CN109189242 A CN 109189242A CN 201811159111 A CN201811159111 A CN 201811159111A CN 109189242 A CN109189242 A CN 109189242A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/023—Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
Abstract
A kind of key board unit based on PS2 agreement has 4 function buttons and logical value key more than 10；Wherein, two kinds of optional functions can be respectively set in 4 function buttons；Logical value key more than 10 includes Digital Logic and alphabetical logic；Key can carry out corresponding operation according to the state for pressing front and back；Multiple logical values can be represented with a key, so that technical staff is not needed to increase expand equipment setting to industrial personal computer input equipment function is can be realized, improve space utilization rate, save the design cost of hardware and structure.
Description
Technical field
The present invention relates to industrial personal computer standard input device technical field, especially a kind of key board unit based on PS2 agreement
And working method.
Background technique
The standard input device of current computer be keyboard and mouse, and customize industrial personal computer (industrial control computer, letter
Claim industrial personal computer) due to the various limitations of its operating condition, input equipment can be integrated on industrial personal computer.
In general, common keyboard has 104 keys (or 101 keys, 105 keys etc.), if by 104 keys (or 101 keys, 105 keys
Deng) be all integrated into industrial personal computer, then needing to be separately configured certain space is laid out, and influences the volume of industrial personal computer, increases it
Cost can also be affected and be limited to the space layout of industrial personal computer itself.
Currently, industrial personal computer, especially certain customization industrial personal computers, referring to Fig. 1, the input equipment (keyboard) of the industrial personal computer and defeated
Equipment (display screen) is integrated on front panel out.Keyboard wraps on keyboard frequently with conventional custom PS2 keyboard as shown in Figure 2
Control key and number key etc. are included.Customization keyboard on traditional industrial personal computer is single function type key, and a key can only represent one
A key value, if desired increasing key can only be according to space again planning and designing and increased quantity is limited by space.It realizes
The key of one physics can only correspond to a key assignments, consistent with common PS2 keyboard principle.
The scanning theory state process of conventional keyboard as shown in figure 3, timing diagram as shown in figure 4, by taking number key 9 as an example,
Scan process state timing chart is as shown in Figure 7.Conventional keyboard is being pressed using timing scan method using time T as the polling interval time
Under lift during generate 4 kinds of states, S1 is the free time, and S2 is to have a key pressing, and S3 is that key has been pressed, and S4 lifts for key.Simultaneously
Detect 2 kinds of trigger conditions, DH(key scan is high) and DL(key scan be low).
Status change is determined according to the level state that key different moments are scanned, and scanning transition process is as follows:
In S1 state, if key level value is height, continue to keep S1 state, if key level value be it is low, cut
Change to S2 state.
It is switched to S1 state if key level value is height in S2 state, this time to press shake, if key
Level value is low, then being switched to S3 state, expression has by key pressing really, sends make code at this time.
In S3 state, if key level value is height, be switched to S4 state, if key level value be it is low,
Keep S3 state.
It is switched to S1 state, has indicated that key lifts at this time, at this time if key level value is height in S4 state
Send short in size.If key level value be it is low, S3 state is switched to, this time to lift shake.
That is, the principle of common PS2 keyboard is the corresponding fixed keyboard scancode of a key, work as key pressing
Shi Jianpan sends make code and arrives PC industrial personal computer, sends short in size when key lifts, the foundation PS2 protocol realization transmission of make code and short in size,
The PS2 agreement of common keyboard is realized based on hardware chip, can not achieve the expanded application of key.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to propose a kind of key board unit and work based on PS2 agreement
Make method, structure is simple, and full-featured, scalability is strong, and method is easy to accomplish.
Technical solution of the present invention: a kind of key board unit based on PS2 agreement, including keyboard input devices, MCU single-chip microcontroller
Control unit and computer motherboard unit；It is characterized in that being provided with 4 function buttons and 10 on the keyboard input devices
More logical value keys；Wherein, 4 function buttons are F1/F2 key, F3/F4 key, F5/F6 key and F7/F8 key, each
The settable two kinds of optional functions of function key；Logical value key more than 10 be respectively 1ABC key, 2DEF key, 3GHI key,
4JKL key, 5MNO key, 6PQR key, 7STU key, 8VWX key, 9YZ key and 0+- key, each function key can be set
Set at least one logical value；The keyboard input devices are connect according to I/O port with MCU single chip control unit；The MCU monolithic
It is in be bi-directionally connected between machine control unit and computer motherboard unit.
The MCU single chip control unit is 128 chip of MCU ATMEL MEGA, the chip have the port P2, the port P3 and
The port P4, for handling push button signalling；It is also configured with the port P1.0 and the port P1.1, connect, is used for computer motherboard unit
Simulate PS2 clock signal；128 chip of MCU ATMEL MEGA has the power supply of+5V power supply terminal Yu computer motherboard unit
Connection；128 chip of MCU ATMEL MEGA has GND terminal to connect with the end GND of computer motherboard unit.
The computer motherboard unit is industrial control computer mainboard；Band+5V power supply on the industrial control computer mainboard, with MCU single-chip microcontroller
+ 5V the power supply terminal of control unit connects, and provides working power for MCU single chip control unit；Have on the industrial control computer mainboard
CLOCK terminal is connect with the output end of the port P1.0 of MCU single chip control unit；There is the end DATA on the industrial control computer mainboard
Son is connect with the input terminal of the port P1.1 of MCU single chip control unit.
A kind of working method of the key board unit based on PS2 agreement, it is characterised in that the core of this method is to key function
The scan process of energy；The state machine is made of two layers of state machine altogether, and first layer is conventional keyboard state machine, and the second layer is based on the
One layer of keypad state machine；The first layer state machine include 4 kinds of states, be respectively idle state S1, have key pressing state S2,
Key down state S3 and key lifting status S4；The second layer state machine includes three state and 3 kinds of trigger conditions, wherein institute
Stating three state includes idle state C1, even by middle state C2 and even by end state C3；3 kinds of trigger conditions include by having
Key pressing state S2 variation is the key condition SJ1 of down state S3, time-out generating state SJ2 and unconditional state SJ3；Specifically
The following steps are included:
(1) key pressing is pressed, first layer state machine is scanned the current state of key and previous execution state；
(2) if the current state scanned is the state S3 of first layer state machine, and previous execution state is first layer state machine
State S2, second layer state machine will be triggered by the condition SJ1 that has key pressing state S2 to change for key down state S3；
(3) if the second layer state of current key is idle state C1, receiving trigger condition is by there is key pressing state S2 change
Key is turned to after the condition SJ1 of down state S3, the second layer state of key is switched to even by middle state C2；If current key
The second layer state be even to press middle state C2, it is key down state S3 that receive trigger condition, which be by there is key pressing state S2 variation,
Condition SJ1 after, will continue keep C2 state；
(4) after the interval time pressed when 2 times is not less than the TO time, the state of second layer state machine is switched to even by end state
C3, even by end state C3 under send current record logical buttons pass through and short in size；It is arrived in next sweep interval
After reaching, then from even idle state C1 is unconditionally switched to automatically by end state C3, company is terminated by process；
(5) when pressing the button in the time interval in continuous several times to be less than TO, the logical value of key every time jump in order by circulation
Become primary, and be saved in the logical buttons variable of current record, the make code of the logic key is sent in the case where even pressing end state C3
And short in size, to realize that a physical button corresponds to multiple logical values.
The working principle of the invention: describing the working principle of the invention by taking 9YZ key as an example below, when key pressing is primary and lifts
Make code and the short in size that 9 are sent after consecutively press and (press interval and be less than TO) and then send after lifting the make code of Y twice and break
Code consecutively presses make code and the short in size (pressed interval three times and be less than TO) and send Z after lifting, consecutively presses four times (between pressing
Every make code and the short in size for then sending 9 less than TO) and after lifting, circuit sequentially.Break-through point of the invention is the logic to keyboard
Treatment process and processing to PS2 agreement.
Superiority of the invention: the cutting randomly property and good scalability that 2 keyboard of traditional PS cannot achieve are realized, is embodied
The novelty of software definition PS2 keypad function；One key can represent multiple logical values, and technical staff is made not need to increase extension
The setting to industrial personal computer input equipment function can be realized in press key equipment, improves space utilization rate；Multiple logical values can repair
Change software and reconfigure its function, save the design cost of hardware and structure, improves the competitiveness of product.
Detailed description of the invention
Fig. 1 is the PM prototype model for customizing industrial personal computer in the prior art.
Fig. 2 is the functional block diagram of conventional custom PS2 keyboard in the prior art.
Fig. 3 is the scanning theory state flow diagram of conventional keyboard in the prior art (double-round represents initial state).
Fig. 4 is the state timing chart of conventional keyboard in the prior art.
Fig. 5 is a kind of overall structure block diagram of the key board unit key board unit based on PS2 agreement involved by the present invention.
Fig. 6 is a kind of hardware circuit schematic block diagram of the key board unit key board unit based on PS2 agreement involved by the present invention.
Fig. 7 is a kind of process signal of the working method of the key board unit key board unit based on PS2 agreement involved by the present invention
Figure.
Fig. 8 shows for a kind of scanning theory state process of the key board unit key board unit based on PS2 agreement involved by the present invention
It is intended to (wherein, double-round represents initial state).
Fig. 9 is a kind of state timing of the course of work of the key board unit key board unit based on PS2 agreement involved by the present invention
Figure.
Specific embodiment
Embodiment: a kind of key board unit based on PS2 agreement, as shown in figure 5, including keyboard input devices, MCU single-chip microcontroller
Control unit and computer motherboard unit；It is characterized in that being provided with 4 function buttons and 10 on the keyboard input devices
More logical value keys；Wherein, 4 function buttons are F1/F2 key, F3/F4 key, F5/F6 key and F7/F8 key, each
The settable two kinds of optional functions of function key；Logical value key more than 10 be respectively 1ABC key, 2DEF key, 3GHI key,
4JKL key, 5MNO key, 6PQR key, 7STU key, 8VWX key, 9YZ key and 0+- key, each function key can be set
Set at least one logical value；The keyboard input devices are connect according to I/O port with MCU single chip control unit；The MCU monolithic
It is in be bi-directionally connected between machine control unit and computer motherboard unit.
The MCU single chip control unit is 128 chip of MCU ATMEL MEGA, as shown in fig. 6, the chip has the end P2
Mouth, the port P3 and the port P4, for handling push button signalling；It is also configured with the port P1.0 and the port P1.1, with computer motherboard list
Member connection, for simulating PS2 clock signal；128 chip of MCU ATMEL MEGA has+5V power supply terminal and calculates owner
The power supply of plate unit connects；128 chip of MCU ATMEL MEGA has the end GND of GND terminal and computer motherboard unit to connect
It connects.
The computer motherboard unit is industrial control computer mainboard, as shown in Figure 5；Band+5V power supply on the industrial control computer mainboard, with
+ 5V the power supply terminal of MCU single chip control unit connects, and provides working power for MCU single chip control unit；The industrial personal computer
There is CLOCK terminal on mainboard, is connect with the output end of the port P1.0 of MCU single chip control unit；On the industrial control computer mainboard
There is DATA terminal, is connect with the input terminal of the port P1.1 of MCU single chip control unit.
A kind of working method of the key board unit based on PS2 agreement, as shown in Figure 7, Figure 8, it is characterised in that this method
Core is the scan process to keypress function, scanning theory state machine as shown in figure 8, the state machine altogether by two layers of state unit
At first layer is conventional keyboard state machine, and the second layer is the keypad state machine based on first layer；The first layer state machine includes
4 kinds of states are idle state S1 respectively, have key pressing state S2, key down state S3 and key lifting status S4；Described second
Layer state machine includes three state and 3 kinds of trigger conditions, wherein the three state includes idle state C1, even by middle state C2
End state C3 is pressed with connecting；3 kinds of trigger conditions include by there is the item that key pressing state S2 variation is key down state S3
Part SJ1, time-out generating state SJ2 and unconditional state SJ3；Specifically includes the following steps:
(1) key pressing is pressed, first layer state machine is scanned the current state of key and previous execution state；
(2) if the current state scanned is the state S3 of first layer state machine, and previous execution state is first layer state machine
State S2, second layer state machine will be triggered by the condition SJ1 that has key pressing state S2 to change for key down state S3；
(3) if the second layer state of current key is idle state C1, receiving trigger condition is by there is key pressing state S2 change
Key is turned to after the condition SJ1 of down state S3, the second layer state of key is switched to even by middle state C2；If current key
The second layer state be even to press middle state C2, it is key down state S3 that receive trigger condition, which be by there is key pressing state S2 variation,
Condition SJ1 after, will continue keep C2 state；
(4) after the interval time pressed when 2 times is not less than the TO time, the state of second layer state machine is switched to even by end state
C3, even by end state C3 under send current record logical buttons pass through and short in size；It is arrived in next sweep interval
After reaching, then from even idle state C1 is unconditionally switched to automatically by end state C3, company is terminated by process；
(5) when pressing the button in the time interval in continuous several times to be less than TO, the logical value of key every time jump in order by circulation
Become primary, and be saved in the logical buttons variable of current record, the make code of the logic key is sent in the case where even pressing end state C3
And short in size, to realize that a physical button corresponds to multiple logical values.
With reference to the accompanying drawing and specific embodiment the present invention is further described.
Key board unit of the invention is the reformed AHP of conventional keyboard realization principle, and a physical button corresponds to multiple keyboards
Scan code, such as when a key corresponds to 9YZ, 9 make code and short in size are sent after key pressing is primary and lifts, consecutively presses two
Make code and short in size secondary and that Y is then sent after lifting consecutively press three times and send after lifting make code and the short in size of Z, consecutively press 4
Make code and short in size secondary and that 9 are then sent after lifting, circuit sequentially.Break-through point of the invention is the logical process process to keyboard
And the processing to PS2 agreement.
And key board unit functional block diagram of the invention corresponds to multiple logic keys as shown in figure 3, realizing a physical button
Value, greatly strengthens the input range of keyboard.It compares, traditional keyboard can not cover all letter inputs, serious to limit
The exploitation and use of application of industrial control computer software are made.And the present invention solves the problems, such as this and scalability is strong, it can be by soft
Part definition keyboard logical value, greatly enhances the flexibility of equipment.
The hardware block diagram of key board unit of the present invention is shown in Fig. 4, the port P2, P3 and P4 for handling push button signalling, P1.0 and
P1.1 is for simulating PS2 clock signal.The crucial treatment process of keyboard is by software realization.
The software flow of key board unit of the present invention is shown in Fig. 5, the core that key scan processing designs for whole device.Below
The scan process of detailed comparisons' tradition scan process and apparatus of the present invention, keyboard scan adoption status plane mechanism are realized.
After pressing key pressing, when first layer current state is S3 and first layer last state is S2, if the second layer
Current state is C1, then the second layer state is switched to C2, keeps C2 state if second layer current state is C2.It is pressed when 2 times
Under interval time not less than after the TO time, the second layer state is switched to C3, and the logic that current record is sent under C3 state is pressed
Key pass through and short in size.C3 is unconditionally switched to C1 automatically after the arrival of next sweep interval, and company is terminated by process.
When pressing the button in time interval of the continuous several times to be less than TO, the logical value of key every time jump in order by circulation
Become primary, and be saved in the logical buttons variable of current record, the make code of the logic key is sent under C3 state (second layer)
And short in size, to realize that a physical button corresponds to multiple logical values.
The present invention overcomes the complex process of two layers of state machine of continuous key-press scanning, can perfectly handle continuous
Event is pressed, switching when having reached the transmission of PS2 keyboard scancode breaches the limitation application of PS2 agreement.
Above embodiments are only to the present invention is based on the concrete applications of the device of the customization keyboard of PS2 agreement and implementation method
Example is not intended to limit the claim of this application.It is all to be carried out within the spirit and principle of the claim of this application technical solution
Any modification, equivalent replacement and non-intrinsically safe improve etc., within the scope of application right of the invention is claimed.
The present invention does not address place and is suitable for the prior art.
Claims (4)
1. a kind of key board unit based on PS2 agreement, including keyboard input devices, MCU single chip control unit and calculating owner
Plate unit；It is characterized in that being provided with 4 function buttons and logical value key more than 10 on the keyboard input devices；Wherein, 4
A function button is F1/F2 key, F3/F4 key, F5/F6 key and F7/F8 key, and settable two kinds of each function key can
Select function；Logical value key more than 10 be respectively 1ABC key, 2DEF key, 3GHI key, 4JKL key, 5MNO key,
6PQR key, 7STU key, 8VWX key, 9YZ key and 0+- key, the settable at least one logical value of each function key；Institute
It states keyboard input devices and is connect according to I/O port with MCU single chip control unit；The MCU single chip control unit and calculating owner
It is in be bi-directionally connected between plate unit.
2. a kind of key board unit based on PS2 agreement according to claim 1, it is characterised in that the MCU single-chip microcontroller control
Unit is 128 chip of MCU ATMEL MEGA, which has the port P2, the port P3 and the port P4, for handling push button signalling；
It is also configured with the port P1.0 and the port P1.1, is connect with computer motherboard unit, for simulating PS2 clock signal；The MCU
128 chip of ATMEL MEGA has+5V power supply terminal and the power supply of computer motherboard unit to connect；The MCU ATMEL MEGA
128 chips have GND terminal to connect with the end GND of computer motherboard unit.
3. a kind of key board unit based on PS2 agreement according to claim 2, it is characterised in that the computer motherboard
Unit is industrial control computer mainboard；Band+5V power supply on the industrial control computer mainboard connects with+5V the power supply terminal of MCU single chip control unit
It connects, provides working power for MCU single chip control unit；There is CLOCK terminal on the industrial control computer mainboard, with MCU single-chip microcontroller control
The output end of the port P1.0 of unit processed connects；There is DATA terminal on the industrial control computer mainboard, with MCU single chip control unit
The input terminal of the port P1.1 connects.
4. a kind of working method of the key board unit based on PS2 agreement, it is characterised in that the core of this method is to keypress function
Scan process；The state machine is made of two layers of state machine altogether, and first layer is conventional keyboard state machine, and the second layer is based on first
The keypad state machine of layer；The first layer state machine includes 4 kinds of states, is idle state S1 respectively, has key pressing state S2, key
Down state S3 and key lifting status S4；The second layer state machine includes three state and 3 kinds of trigger conditions, wherein described
Three state includes idle state C1, even by middle state C2 and even by end state C3；3 kinds of trigger conditions include by there is key
Down state S2 variation is the key condition SJ1 of down state S3, time-out generating state SJ2 and unconditional state SJ3；Specific packet
Include following steps:
(1) key pressing is pressed, first layer state machine is scanned the current state of key and previous execution state；
(2) if the current state scanned is the state S3 of first layer state machine, and previous execution state is first layer state machine
State S2, second layer state machine will be triggered by the condition SJ1 that has key pressing state S2 to change for key down state S3；
(3) if the second layer state of current key is idle state C1, receiving trigger condition is by there is key pressing state S2 change
Key is turned to after the condition SJ1 of down state S3, the second layer state of key is switched to even by middle state C2；If current key
The second layer state be even to press middle state C2, it is key down state S3 that receive trigger condition, which be by there is key pressing state S2 variation,
Condition SJ1 after, will continue keep C2 state；
(4) after the interval time pressed when 2 times is not less than the TO time, the state of second layer state machine is switched to even by end state
C3, even by end state C3 under send current record logical buttons pass through and short in size；It is arrived in next sweep interval
After reaching, then from even idle state C1 is unconditionally switched to automatically by end state C3, company is terminated by process；
(5) when pressing the button in the time interval in continuous several times to be less than TO, the logical value of key every time jump in order by circulation
Become primary, and be saved in the logical buttons variable of current record, the make code of the logic key is sent in the case where even pressing end state C3
And short in size, to realize that a physical button corresponds to multiple logical values.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111628781A (en) * | 2020-06-17 | 2020-09-04 | 玉林师范学院 | Matrix keyboard based on RS232 serial port communication |
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