CN101888250A - Key system and method thereof - Google Patents
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- CN101888250A CN101888250A CN2010101906551A CN201010190655A CN101888250A CN 101888250 A CN101888250 A CN 101888250A CN 2010101906551 A CN2010101906551 A CN 2010101906551A CN 201010190655 A CN201010190655 A CN 201010190655A CN 101888250 A CN101888250 A CN 101888250A
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Abstract
The invention relates to a key reading system and a method thereof. The key reading system comprises a key controller and a host machine. After a chip is energized, keys are scanned in a low frequency mode. When a key is pressed, the low frequency mode is switched to a high frequency mode for scanning and confirming the key. If the key is effective, the position of the output end of the chip is low, and the host machine outputs a reading pulse to read key information output by the output end of the chip. The position of the output end of the chip becomes high after reading is finished, and the chip recovers to the low frequency key scanning mode. In the key reading system, the chip only needs two wires to communicating with the host machine to read the keys; the system operates in the low frequency scanning mode when no key is pressed, and thus, the power consumption of the system is reduced.
Description
[technical field]
The present invention relates to chip field, particularly about a kind of button controller and button reading system and method.
[background technology]
Current more full keyboard mobile phone appearred on the market, number of keys is required than higher, generally need use the button about 40, hardware resource for cell phone platform is had relatively high expectations, and present domestic cell phone platform major part all is that MTK (Taiwan MediaTek Inc.) provides, and mainly contains 23,25,35 platforms, wherein the abundantest full keyboard of can realizing of 35 platform internal hardware resources is used, but cost is higher.And 23,25 platform costs are relatively low, and present most of mobile phone is all used this two platform developments, use extensivelyr, can not provide the full keyboard mobile phone required whole buttons but hardware resource is limited.Therefore a low-power consumption is being sought in most of mobile phone scheme commercial city, and it is few to take hardware resource, and is peripheral simple, presses bond number greater than 40 button expanded circuit.
I/O extended mode commonly used is in the market realized key-press matrix, chip commonly used has SN7325, PCA9535 etc., this scheme need be used 3 data lines, add an interrupt signal line with the I2C communication modes, be encapsulated as QFN24, can realize the expansion of 64 buttons at most, owing to be that the I/O extended mode is realized, therefore when reading button, need main frame that its port status is scanned and confirm key position, this button expansion is to realize by software mode that with general purpose I/O expanded circuit efficient is lower.
[summary of the invention]
The object of the present invention is to provide a kind of key system, it can support more keys, and low in energy consumption, occupying system resources is few.
Another object of the present invention is to provide a kind of button controller, it is low in energy consumption, it is few to take hardware resource, and is peripheral simple.
A further object of the present invention is to provide a kind of button read method, and it is low in energy consumption, and occupying system resources is few.
To achieve these goals, a kind of key system of the present invention, it comprises key board, button controller and CPU,
Described button controller comprises a data output and a control input end,
Described button controller scans keyboard with low frequency mode, when having detected button and press, described button controller switches to high frequency mode keyboard is scanned to obtain the key information data and the data output end of described button controller is changed to effectively;
When described CPU is effective at the data output end that detects button controller, control input end by button controller transmits control signal to button controller, described button controller under the control of described control signal from described data output end output key information data to CPU.
Further, described button controller comprises crystal oscillator clock unit and RC running clock unit, provides scan clock by the crystal oscillator clock unit when low frequency mode, provides scan clock by RC running clock unit when high frequency mode.
Further, described control signal is a clock signal.
Further, after key information data output finished, described button controller continued to carry out keyboard scan with high frequency mode, and after detecting button and unclamping, it is invalid that data output end is changed to, and switched to low frequency mode and carry out keyboard scan.
Further, described key board includes the plurality of keys array lines, described button controller comprises the plurality of keys link, and wherein each button link connects a push-button array line of described key board, and every push-button array line defines a button respectively with any other push-button array lines.
For reaching aforementioned another purpose, a kind of button controller of the present invention, it comprises:
Clock unit provides high frequency sweep clock and low-frequency sweep clock;
The key scan unit carries out keyboard scan and confirms the key information data;
Output unit has a data output and a control input end;
Control unit, control key scan unit carries out keyboard scan with the low-frequency sweep clock, when detecting button and press, control key scan unit, is exported described key information data according to the control signal of control input end input to obtain the key information data and data output end is changed to effectively with the keyboard scan of high frequency sweep clock by described data output end.
Further, described clock unit comprises crystal oscillator clock unit and RC running clock unit, by crystal oscillator clock unit provide clock signal during keyboard scan in the key scan unit under low frequency mode, the key scan unit provides clock signal by RC running clock unit during keyboard scan under high frequency mode.
Further, described RC running clock unit comprises resistance and electric capacity, and described electric capacity is arranged in the button controller, and described resistance is to be arranged at the outer outer meeting resistance of button controller.
For reaching an aforementioned purpose again, a kind of button read method of the present invention, it comprises:
Button controller scans button with low frequency mode;
Button controller switches to high frequency mode scanning and confirms button when button is pressed;
When button was pressed, the output of button controller was set to effectively;
When the output that CPU detects button controller is effective, send a control signal to button controller; The key information data of the button that button controller is pressed by described output output under the control of described control signal are to described CPU.
Further, after key information data output finished, described button controller continued to carry out keyboard scan with high frequency mode, and after detecting button and unclamping, it is invalid that data output end is changed to, and switched to low frequency mode and carry out keyboard scan.
Compared with prior art, key system of the present invention, its key board includes the plurality of keys array lines, button controller comprises the plurality of keys link, wherein each button link connects a push-button array line of described key board, every the push-button array line defines a button respectively with any other push-button array lines, can be with less input expansion more keys.When not having button to press, it is operated under the low-frequency sweep pattern by key control, when button is pressed, switches to high frequency mode scanning and confirms button, can save power consumption.The output of button controller when being effective CPU by the input input control signal of button controller, read key information from the button controller output, chip only needs two universal input and output port, it is few to take the host Central Processing Unit (CPU) hardware resource, periphery circuit is simple, the circuit pin is few, and main frame can be saved the system break resource by interrupting or the mode of regularly inquiry read button.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of key system of the present invention
Fig. 2 is the structured flowchart of button controller of the present invention
Fig. 3 is the pulse sequence figure of the key information data and the control signal that CPU sends of key system button controller output port output of the present invention.
Fig. 4 is the workflow schematic diagram of button expanding system of the present invention.
[embodiment]
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, all other embodiment that those of ordinary skills are obtained under the situation that does not break away from the present invention's essence and spirit belong to the scope that the present invention is open and protect.
Different local " embodiment " that occur refer to same embodiment in this specification, neither with repel mutually separate of other embodiment or embodiment optionally.
See also shown in Figure 1, it shows the structural representation of button reading system according to an embodiment of the invention, as shown in the figure, it host Central Processing Unit (CPU) (MCU) that comprises push-button array, button controller and link to each other of button reading system of the present invention with button controller.
As shown in Figure 1, in one embodiment of the invention, described button controller is an integrated button extended chip, it comprises 16 pins altogether, wherein the label of button extended chip is 1, totally 12 pins of 3-13 are the button input port, these 12 pins link to each other with a push-button array line respectively, push-button array of the common formation of these push-button array lines, wherein any two push-button array lines can define a button jointly, for example push-button array line that links to each other with pin 3 among the figure and the push-button array line that links to each other with pin 4 define a button that is encoded to " 01 " jointly, button that is encoded to " 39 " of push-button array line that links to each other with pin 6 and the common definition of the push-button array line that links to each other with pin 12,12 push-button array lines that such 12 pins link to each other intersect mutually can form 66 buttons altogether.When any one button was pressed, then two pins can be switched on, and made the level of input port of chip change, and can discern is which button is pressed.About the internal structure of described button extended chip, the back will describe in detail.
Described in one embodiment of the invention host Central Processing Unit (CPU) is the CPU of mobile phone, and described in other embodiments CPU also can be the CPU of electronic equipments such as MP3/MP4 or game machine certainly.Described CPU comprises that a push button signalling input port and a button read the control signal output ends mouth.
The label of described button extended chip is the outer meeting resistance R1 that 2 the external resistance of pin is 20K, and links to each other with the power supply of+3V by resistance R.
And the label of described button extended chip is 1 pin ground connection.
The label of described button extended chip is that 16 pin links to each other with the power supply of one+3V, is connected with the electric capacity of a 1uF between pin 16 and power supply.
The pin 15 of described button extended chip is an output port, and it links to each other with the push button signalling input port of the CPU of described main frame, the pull-up resistor R2 that to be connected with a resistance between the output port of+3V power supply and button controller be 10K.The pin 14 of described button extended chip reads the signal input end mouth for button, and its button with the CPU of described main frame reads the control signal output ends mouth and links to each other.
See also shown in Figure 2ly, it shows the inner function module structured flowchart of button controller of the present invention.As shown in the figure, button controller of the present invention, it comprises clock unit, control unit, key scan unit, parallel serial conversion unit and serial output unit etc.
Clock unit is that other unit for button controller provide clock pulse, in an embodiment of button controller of the present invention, described clock unit comprises provides the crystal oscillator of low-frequency clock pulse clock pulse unit and the RC running clock pulse unit that high-frequency clock pulse is provided.The resistance R of described RC running clock pulse unit can be shown in Figure 1 as described above, adopts outer meeting resistance R1, and external so different resistance can produce different RC running clock pulses, regulates more flexible.
The input of key scan unit is 12 button input ports of button controller, when the key scan unit is not pressed at button, the low-frequency clock pulse that provides according to clock unit is exported a string scan code and is come whole button is scanned, for example 11111111111 a string like this scan codes are exported in the key scan unit, when wherein certain button is pressed, then the value of key scan unit input port can change, for example may become 01111111111, then the key scan unit knows that according to the variation of input port value a button is pressed, and then the output scanning sign indicating number scans different row or row, determines it specifically is which button is pressed.Principle and detailed method the present invention about key scan no longer are described in detail.
Control circuit unit, it is used to control the switching of clock unit pulse, according to one embodiment of the invention, when button is not pressed, the key scan unit is ceaselessly button to be scanned with the low-frequency clock pulse period property that crystal oscillator clock pulse unit provides, when button is pressed, control circuit switches to RC running clock pulse unit with clock signal, and the key scan unit then carries out high frequency sweep to the button that is pressed and confirms under the high-frequency pulse signal that RC running clock pulse unit provides.
Parallel serial conversion unit is used for converting the key information of key scan unit output to serial signal.
Button controller of the present invention also comprises the serial output unit, can read control signal CS according to the button that host Central Processing Unit (CPU) shown in Figure 1 is imported by pin 14, under the control of described control circuit unit, by the output port serial output key information of pin 15.As shown in Figure 3, the dateout OUT of the output port of its display button controller and the pulse sequence that reads control signal CS.Button controller is output as 8 bit data of D7-D0, and the one digit number certificate is read in the pulse that host Central Processing Unit (CPU) output is 8 successively when the rising edge of each pulse.
See also shown in Figure 4ly, it shows the workflow diagram of key system of the present invention.
As shown in the figure, button controller of the present invention is after starting working, and the crystal oscillator clock unit by clock unit provides the low-frequency clock pulse to the key scan unit earlier, and button controller scans button, step 401 with low frequency mode.Step 402 pair button is judged, if there is not button to press, then returns continuation and carries out key scan with low frequency mode, and that does not so periodically stop carries out key scan.
Whether when high frequency mode carries out that key scan is confirmed can be that effective button is confirmed step 404 to button earlier, in one embodiment, if having two or more buttons to be pressed simultaneously then be judged to be invalid button.Perhaps in some embodiments, may need really to operate by two keys simultaneously, then also can be set at and allow to press simultaneously no longer detailed description herein with other button for some particular key.
Please in conjunction with shown in Figure 3, step 407, the control signal CS that reads that reads the output of control signal output ends mouth of host Central Processing Unit (CPU) is high level when not reading the dateout of button controller, when needs read the dateout of button controller, earlier the CS control signal is become low level, export 8 pulses then, wherein the output output one digit number certificate of control button controller when the trailing edge of each pulse.After the output that reads control signal control button controller of host Central Processing Unit (CPU) is exported the end of 8 bit data, the output of the output port of button controller becomes high level, and the CPU of main frame also reads the control output end with key information and is changed to high level at this moment.
Because button may the user be pinned always and is not unclamped sometimes, though this moment key information to read the control output end be high level, button controller still scans button with high frequency mode this moment.In one embodiment, can set button is scanned affirmation, step 408, after main frame reads key information through a key scan cycle, if when still having effective button, the output port of button controller can become low level once more, and main frame can not send button once more and read control signal CS at this moment.As long as OUT main frame when low still can continue to read, in some cycles, read continuously all be identical key assignments then think long by.。If button unclamps, then key information reads the control output end and is changed to high level, and button controller transfers low frequency mode to and carries out key scan.
Set in the aforementioned embodiment be if key information read finish after the output port of button controller become high level, if it is still effective at a key scan cycle button, then can be once more the output port of button controller be become low level, but main frame does not send button and reads control signal, unclamps or detects invalid button and button chip output mouth is put height up to button.In other embodiments, also can be if the user button is not loose always, then after reading end for the first time, the output port of button controller becomes high level, if through the case of a key scan cycle or predetermined quantity after the scan period button still effective, then once more the output port of button controller is become low level, main frame sent button once more and read control signal this moment, and button is read once more.Then can represent that for not loose always button the user thinks to import this button always, can repeatedly read, unclamp until button to this button.
In case button unclamps, then the output of button controller becomes high level again, and button controller enters the low-frequency sweep pattern of low-power consumption automatically.Main frame just can read button data in the time of can only being low at the output of button controller.If but the output port of button controller is output as low level, but the CPU of main frame do not export when reading control signal, then button continued scanning, button do not read yet.
Key system of the present invention, its key board includes the plurality of keys array lines, button controller comprises the plurality of keys link, wherein each button link connects a push-button array line of described key board, every the push-button array line defines a button respectively with any other push-button array lines, can be with less input expansion more keys.When not having button to press, it is operated under the low-frequency sweep pattern by key control, when button is pressed, switches to high frequency mode scanning and confirms button, can save power consumption.The output of button controller when being effective CPU by the input input control signal of button controller, read key information from the button controller output, chip only needs two universal input and output port, it is few to take the host Central Processing Unit (CPU) hardware resource, periphery circuit is simple, the circuit pin is few, and main frame can be saved the system break resource by interrupting or the mode of regularly inquiry read button.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (13)
1. key system, it comprises key board, button controller and CPU,
Described button controller comprises a data output and a control input end,
Described button controller scans keyboard with low frequency mode, when having detected button and press, described button controller switches to high frequency mode keyboard is scanned to obtain the key information data and the data output end of described button controller is changed to effectively;
When described CPU is effective at the data output end that detects button controller, control input end by button controller transmits control signal to button controller, described button controller under the control of described control signal from described data output end output key information data to CPU.
2. key system as claimed in claim 1, it is characterized in that: described button controller comprises crystal oscillator clock unit and RC running clock unit, when low frequency mode, provide scan clock, when high frequency mode, provide scan clock by RC running clock unit by the crystal oscillator clock unit.
3. key system as claimed in claim 1 is characterized in that: described control signal is a clock signal.
4. key system as claimed in claim 1, it is characterized in that: after key information data output finished, described button controller continued to carry out keyboard scan with high frequency mode, after detecting button and unclamping, it is invalid that data output end is changed to, and switch to low frequency mode and carry out keyboard scan.
5. key system as claimed in claim 1, it is characterized in that: described key board includes the plurality of keys array lines, described button controller comprises the plurality of keys link, wherein each button link connects a push-button array line of described key board, and every push-button array line defines a button respectively with any other push-button array lines.
6. button controller, it comprises:
Clock unit provides high frequency sweep clock and low-frequency sweep clock;
The key scan unit carries out keyboard scan and confirms the key information data;
Output unit has a data output and a control input end;
Control unit, control key scan unit carries out keyboard scan with the low-frequency sweep clock, when detecting button and press, control key scan unit, is exported described key information data according to the control signal of control input end input to obtain the key information data and data output end is changed to effectively with the keyboard scan of high frequency sweep clock by described data output end.
7. button controller as claimed in claim 6, it is characterized in that: described clock unit comprises crystal oscillator clock unit and RC running clock unit, by crystal oscillator clock unit provide clock signal during keyboard scan in the key scan unit under low frequency mode, the key scan unit provides clock signal by RC running clock unit during keyboard scan under high frequency mode.
8. button controller as claimed in claim 6 is characterized in that: described RC running clock unit comprises resistance and electric capacity, and described electric capacity is arranged in the button controller, and described resistance is to be arranged at the outer outer meeting resistance of button controller.
9. button read method, it comprises:
Button controller scans button with low frequency mode;
Button controller switches to high frequency mode scanning and confirms button when button is pressed;
When button was pressed, the output of button controller was set to effectively;
When the output that CPU detects button controller is effective, send a control signal to button controller;
The key information data of the button that button controller is pressed by described output output under the control of described control signal are to described CPU.
10. button read method as claimed in claim 9, it is characterized in that: after the output of key information data finishes, described button controller continues to carry out keyboard scan with high frequency mode, after detecting button and unclamping, it is invalid that data output end is changed to, and switch to low frequency mode and carry out keyboard scan.
11. a button read method, it comprises:
Button controller scans keyboard, and when having detected button and press, described button controller scans to obtain the key information data and the data output end of described button controller is changed to effectively keyboard;
When the data output end that detects button controller when being effective, CPU transmits control signal to button controller by the control input end of button controller, described button controller under the control of described control signal from described data output end output key information data to CPU.
12. method as claimed in claim 11 is characterized in that: when button was not pressed, described button controller scanned button with low frequency mode, and when button was pressed, described button controller switched to high frequency mode button is scanned.
13. a button controller, it comprises:
Clock unit provides the clock signal of button controller;
The key scan unit carries out keyboard scan and confirms the key information data;
Output unit has a data output and a control input end;
Control unit, control key scan unit carries out keyboard scan, when detecting button and press, control key scan unit obtains the key information data and data output end is changed to effectively, according to the control signal of control input end input described key information data is exported by described data output end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101906551A CN101888250A (en) | 2010-06-03 | 2010-06-03 | Key system and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101906551A CN101888250A (en) | 2010-06-03 | 2010-06-03 | Key system and method thereof |
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| CN101888250A true CN101888250A (en) | 2010-11-17 |
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| CN2010101906551A Pending CN101888250A (en) | 2010-06-03 | 2010-06-03 | Key system and method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102122961A (en) * | 2011-03-07 | 2011-07-13 | 惠州Tcl移动通信有限公司 | Key scanning method for electronic equipment |
| CN105549499A (en) * | 2016-03-03 | 2016-05-04 | 深圳市博巨兴实业发展有限公司 | Low-power-consumption MCU-SOC system for keyed application |
| CN105590428A (en) * | 2014-10-23 | 2016-05-18 | 国网辽宁省电力有限公司营口供电公司 | An intelligent information collecting device and a collecting method |
| CN107070460A (en) * | 2017-03-30 | 2017-08-18 | 天津中兴智联科技有限公司 | A kind of key scanning method and system |
| CN112558025A (en) * | 2020-11-30 | 2021-03-26 | 四川九洲空管科技有限责任公司 | Secondary radar inquiry and response function detection equipment |
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| CN102122961A (en) * | 2011-03-07 | 2011-07-13 | 惠州Tcl移动通信有限公司 | Key scanning method for electronic equipment |
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| CN105590428A (en) * | 2014-10-23 | 2016-05-18 | 国网辽宁省电力有限公司营口供电公司 | An intelligent information collecting device and a collecting method |
| CN105549499A (en) * | 2016-03-03 | 2016-05-04 | 深圳市博巨兴实业发展有限公司 | Low-power-consumption MCU-SOC system for keyed application |
| CN107070460A (en) * | 2017-03-30 | 2017-08-18 | 天津中兴智联科技有限公司 | A kind of key scanning method and system |
| CN107070460B (en) * | 2017-03-30 | 2021-02-09 | 天津中兴智联科技有限公司 | Key scanning method and system |
| CN112558025A (en) * | 2020-11-30 | 2021-03-26 | 四川九洲空管科技有限责任公司 | Secondary radar inquiry and response function detection equipment |
| CN112558025B (en) * | 2020-11-30 | 2022-09-13 | 四川九洲空管科技有限责任公司 | Secondary radar inquiry and response function detection equipment |
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Application publication date: 20101117 |