CN201589802U - Oscilloscope with keyboard scanning circuit - Google Patents
Oscilloscope with keyboard scanning circuit Download PDFInfo
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- CN201589802U CN201589802U CN2009203507046U CN200920350704U CN201589802U CN 201589802 U CN201589802 U CN 201589802U CN 2009203507046 U CN2009203507046 U CN 2009203507046U CN 200920350704 U CN200920350704 U CN 200920350704U CN 201589802 U CN201589802 U CN 201589802U
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Abstract
The utility model discloses an oscilloscope with a keyboard scanning circuit, which comprises a control unit (1) for controlling keyboard scanning, a matrix keyboard (2) for key value reading, a scanning control module (3), a line scanning module (4) and a column scanning module (5). The control unit (1) provides a clock signal and a synchronizing signal to the scanning control module (3), the scanning control module (3) provide a gating signal to the line scanning module (4) and provides a gating signal to the column scanning module (5), the line scanning module (4) provides a line scanning signal to the matrix keyboard (2), obtains key value from the matrix keyboard (2) and transmits the key value to a data pin of the control unit (1), and the column scanning module (5) provides a column scanning signal to the matrix keyboard (2). The oscilloscope provided by the utility model utilizes one serial port of the control unit (1) to realize keyboard scanning, control and key value reading functions, and the keyboard array is extensible.
Description
Technical field
The utility model relates to a kind of device that shows electric variable or waveform, specially refers to oscillograph.
Background technology
Oscillograph is a kind of measurement mechanism commonly used, is a kind of graphic display device, and it is divided into analog oscilloscope and digital oscilloscope.The analog oscilloscope working method is direct measurement signal voltages, and describes voltage by the electron beam that from left to right passes the oscillograph screen in vertical direction.Different with analog oscilloscope, digital oscilloscope by analog to digital converter the measured numerical information that is converted to.What it was caught is a series of sample values of waveform, and sample value is stored, subsequently, and the digital oscilloscope reconfiguration waveform.One of great advantage of digital oscilloscope is that it can stored waveform, does observation subsequently again.Digital oscilloscope is divided into digital storage oscilloscope, digital fluorescence oscilloscope and sampling oscilloscope again.
In oscillograph, often need keyboard to carry out man-machine interaction, keyboard is made up of a plurality of buttons.When key number is more, all use matrix keyboard usually, also claim determinant keyboard.The principle of matrix keyboard is exactly that each line does not communicate with the place that intersects of each alignment, but connects a button, connects by button.The I/O mouth of general use control module is connected to above line and lists, and a I/O mouth can connect a line, and an other b I/O can connect b alignment, can form the keyboard of a * b button altogether.One 4 * 4 row-column structure can constitute a keyboard that contains 16 buttons.
With reference to Fig. 1, the matrix keyboard of prior art has 4 line ROW3 ~ ROW0, and 4 alignment COL3 ~ COL0 form 16 key boards from button s1 to button s16.Wherein line ROW3 ~ ROW0 receives four I/O mouth D3 ~ D0 last (marking among the figure) of control module, and alignment COL3 ~ COL0 is connected to four other I/O mouth D7 ~ D4 of control module last (marking among the figure).
The method line by line scan is adopted in prior art keyboard scan, is divided into for two steps to carry out, and the first step is carried out single pass simultaneously to all row of whole keyboard, sees if there is key and presses.If have, carried out for second step again and line by line scan, so that judge the key that is pressed at which, which row.According to keyboard place ranks, just can identify the key of pressing is any key then.Detailed process is as follows: at first, control module makes I/O mouth D3 ~ D0=0000, and control module reads keyboard I/O mouth D7 ~ D4 then, if be 1 entirely, then expression does not have key to press, if be not 1 entirely, then expression has key to press.For example: if the value of the I/O mouth D7 ~ D4 that reads is 1110,, wherein there is one to be 0, expression has key to press, because that " 0 " position correspondence is row COL0, the key that expression is pressed is at first row.Second step: keyboard is lined by line scan.When which control module need scan, as long as make these line output data be " 0 ", remaining row all was " 1 ".Control module reads row mouthful data then, if be " 1 " entirely, represents that this row does not have key to press, if be not " 1 " entirely, representing has key to press, and determines the row of this key according to the position of " 0 " in the data, knows that then the key of these these row of row is pressed.For example, during scanning first row, output D3 ~ D0=1110 is if the data D7 that reads ~ D4=1110 represents that the key S1 of first row, first row is pressed.
Prior art has the following disadvantages: because the I/O mouth that each is gone in the matrix keyboard, each row all will take control module respectively, cause the I/O of whole keyboard grabbing control module to make a slip of the tongue many, and keyboard quantity is many more, the I/O mouth resource that takies will be many more, so, in case think extended keyboard quantity, just need to consider I/O mouth resource problem, can not arbitrarily expand.
The utility model content
Technical problem to be solved in the utility model is: solve the deficiencies in the prior art, a kind of oscillograph with keyboard scanning circuit is provided.
For solving the problems of the technologies described above, the oscillograph that the utility model provides with keyboard scanning circuit, comprise a matrix keyboard, one is used for the control module that supervisory keyboard scans and key assignments reads, also comprise the one scan control module, delegation's scan module, one column scan module, described control module provides clock signal from the clock pin to the scan control module, described control module provides synchronizing signal from the frame synchronization pin to the scan control module, described scan control module provides gating signal to described line scanning module, described scan control module provides capable gating signal to described column scan module, described line scanning module provides line scan signals to described matrix keyboard, described line scanning module is obtained key assignments and is delivered to the data pin of control module from described matrix keyboard, and described column scan module provides column scan signal to described matrix keyboard.
Described scan control module comprises one first counter and one second counter, the input end of clock of described first counter connects the clock pin of described control module, the reset pin of described first counter and second counter is connected the frame synchronization pin of control module, the carry-out bit of described first counter is connected to the channel selecting input end of described line scanning module successively, the highest carry-out bit of described first counter connects the input end of clock of described second counter, and the carry-out bit of described second counter is connected to the channel selecting input end of described column scan module successively.
Described line scanning module can be made of multiway analog switch.
The capable pin of the passage input and output pin connection matrix keyboard of described multiway analog switch, public input and output pin connects the data pin of control module, the maximal value that the way of described analog switch is exported greater than first counter at least.
Described column scan module can be made of multiway analog switch.
The public input and output pin ground connection of described multiway analog switch, the row pin of the passage input and output pin connection matrix keyboard of multiway analog switch, the maximal value that the way of described analog switch is exported greater than second counter at least.
Described matrix keyboard can be a key board.
Described matrix keyboard can be the incremental encoder keyboard.
Described matrix keyboard can be the keyboard of button and incremental encoder combination.
The utility model compared with prior art has following beneficial effect: the utility model only utilizes clock pin, frame synchronization pin and the data pin of a serial ports of control module, just realized the function that scanning, control and key assignments to keyboard read, only taken the less resource of control module, and according to actual needs and arbitrarily expansion of keyboard array.
Description of drawings
Fig. 1 is the principle key diagram of prior art matrix keyboard
Fig. 2 is the oscillographic principle key diagram of the utility model
Fig. 3 is the schematic diagram of specific embodiment of the utility model 1
Fig. 4 is the schematic diagram of specific embodiment of the utility model 2
Fig. 5 is each pin output waveform of the utility model counter 31 sum counters 32 correspondences
Fig. 6 is the application synoptic diagram of the utility model incremental encoder 6
Fig. 7 is the output pulse diagram of the utility model incremental encoder 6
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
Embodiment 1:
With reference to Fig. 2, the utility model oscillograph comprises and is used for control module 1 and the matrix keyboard 2 that supervisory keyboard scanning and key assignments read, and also comprises scan control module 3, line scanning module 4, column scan module 5.Control module 1 provides clock signal from clock pin CLK to scan control module 3, control module 1 provides synchronizing signal from frame synchronization pin CLR to scan control module 3, and scan control module 3 provides gating signal, scan control module 3 to provide gating signal to column scan module 5 to line scanning module 4.Line scanning module 4 provides line scan signals to matrix keyboard 2, and line scanning module 4 is obtained key assignments and delivered to the data pin DATA of control module 1 from matrix keyboard 2, and column scan module 5 provides column scan signal to matrix keyboard 2.
With reference to Fig. 3, in the present embodiment, control module 1 adopts CPU, selects clock pin CLK, frame synchronization pin CLR and the data pin DATA of the serial port of control module 1 for use, realizes reading scanning, control and the key assignments of matrix keyboard 2.Scan control module 3 is made up of counter 31 sum counters 32, and counter 31 sum counters 32 adopt 4 binary counter 74HC393, and line scanning module 4, column scan module 5 are selected 8 path analoging switch 74HC4051 for use.The input end of clock of counter 31 connects the clock pin CLK of control module 1, the reset pin MR of counter 31 sum counters 32 connects the frame synchronization pin CLR of control module 1, in the present embodiment, 32 outputs of counter 31 sum counters are all used 3, carry-out bit Q0, the Q1 of counter 31, Q2 are connected respectively to channel selecting input end A, B, the C of line scanning module 4, the carry-out bit Q2 of counter 31 is the input end of clock CLK of linkage counter 32 simultaneously, and carry-out bit Q0, the Q1 of counter 32, Q2 are connected to channel selecting input end A, B, the C of column scan module 5 successively.
In the present embodiment, the passage input and output pin X0 of line scanning module 4～X7 is the capable pin ROW0～ROW7 of connection matrix keyboard 2 respectively, the public input and output pin X of line scanning module 4 connects the data pin DATA of control module 1, the passage input and output pin X0 of column scan module 5～X7 is the row pin COL0～COL7 of connection matrix keyboard 2 respectively, the public input and output pin X ground connection of column scan module 5.
In the present embodiment, owing to line scanning module 4, column scan module 5 are all selected 8 path analoging switch 74HC4051 for use, so can realize one 8 * 8 matrix.Reality has been used 48 buttons in the present embodiment, 1 incremental encoder 6, totally 51 key assignments.The capable pin ROW0 of matrix keyboard 2～ROW7 uses 10k resistance to be connected to power supply VCC, makes acquiescence be output as height.
The course of work is as follows:
The frequency of clock pin CLK is set, makes the time of the time of single pass, such as tens ms much smaller than people's button.The carry-out bit Q2 of counter 31 is the input end of clock CLK of linkage counter 32 simultaneously, makes counter 31 sum counters 32 become the counter of cascade.When counter 32 outputs changed 1 like this, counter 31 outputs changed one-period.With reference to Fig. 5, be each pin output waveform of counter 31 sum counters 32 correspondences, wherein counter 31 outputs are made as A1, A2, A3, and they form number is A, and counter 32 outputs are made as B1, B2, B3, and they form number is B.As we can see from the figure, B changes to 7 from 0, the numerical value of corresponding B, and A also changes to 7 from 0.
When counter 31 was output as 1, the 1st paths of gating line-scan module 4 even the 1st row ROW1 of keyboard is connected on the data pin DATA, was given control module 1, and scanning and the key assignments finished the 1st row read.When counter 1 output changes by 0～7, the 0th row ROW0～7th row ROW7 of keyboard is scanned with key assignments and reads.
Counter 32 is output as at 1 o'clock, makes column scan module 5 gatings the 1 tunnel, makes the 1st row COL1 ground connection of keyboard matrix, and all the other row are unsettled, promptly the 1st row scanned.When counter 32 outputs change by 0～7, the 0th of keyboard is listed as COL0～7th row COL7 scans.
The entire circuit course of work is: when counter 32 is output as 1, to the 1st column scan.Counter 32 is 1 o'clock, and counter 31 outputs are from 0～7 variation, and scanning and the key assignments finished the 0th row～the 7 row read.When counter 32 output when 0～7 changes, finish scanning to all row, the variation of integration counter 31 sum counters 32, thereby finish single pass process to all keys.
The value that occurs each key on the public input and output pin X of line scanning module 4 successively, frequency is the frequency of counter 31 carry-out bit Q0, it is the CLK frequency, line scanning module 4 has been finished a cataloged procedure to key assignments, the value of all keys is become a serial code with clock CLK frequency coding, and control module 1 can read above-mentioned serial code by data pin DATA.When control module 1 was received all key assignments, frame synchronization pin CLR can export a synchronizing pulse, and counter 31 sum counters 32 are resetted, and restarted the keyboard scan process of reading.
Button is can also to use incremental encoder 6 to matrix keyboard 2 except that using, and with reference to Fig. 6, incremental encoder 6 has comprised a knob and a button, between button pin S1 and button pin S2 be one by being good for.The code-disc of a contact is arranged between code-disc pin E1, E2, the E3, promptly rotate code-disc, conducting respectively between pin E1, E2, E3.
With reference to Fig. 3, the button pin S2 of incremental encoder 6 is connected on the row COL0, code-disc pin E1 is connected to capable ROW0 by diode D1 goes up, code-disc pin E3 is connected on the capable ROW1 by diode D2, diode D1, D2 have played the effect of unidirectional conducting, and row COL0 connects low level.With reference to Fig. 6, rotation waveform A, B occur during code-disc on the code-disc pin, leading 90 ° of A waveforms than B waveform, and the level that level of representing with the A waveform and B waveform are represented combines as binary code, then occurs 11,01,00,10 successively.If sense of rotation is opposite, then the B waveform is than A waveform leading 90 °, and then the level represented of level of representing with the A waveform and B waveform combines as binary code, occurs 11,10,00,01 successively.Incremental encoder 6 is added in the keyboard matrix 2, only need to judge above-mentioned binary code, just can identify sense of rotation.
For example: incremental encoder 6 takies capable ROW0～ROW1 in the matrix keyboard 2, take row COL0, when the button of incremental encoder 6 is pressed, row ROW1 and row COL0 short circuit are connected to ground, by line scanning module 4 and column scan module 5, the ROW1 that will go is that low level state is delivered on the data pin DATA, read by control module 1,, judge incremental encoder 6 and be pressed according to " 0 " position in frame data.
When incremental encoder 6 rotations, with reference to Fig. 7, A Signal representative row ROW0 goes up the level that occurs, the level that B Signal representative row ROW1 occurs, if scan present position D for the first time, the data pin DATA that control module 1 reads goes up corresponding line ROW0, row ROW1 position is " 11 ", keyboard constantly scans, instantly single pass is to next state A Signal " ON ", B Signal " OFF ", then the DATA that reads of control module 1 goes up and correspondingly " 01 " can occur, and next state corresponding data pin DATA goes up " 00 ", more corresponding " 10 ".That is: incremental encoder 6 is along the rotation of CW direction, and data pin DATA goes up corresponding line ROW0, and the data bit variation of row ROW1 is " 11 ", " 01 ", " 00 ", " 10 " in proper order.If incremental encoder 6 is along the rotation of CW reverse direction, then data pin DATA goes up corresponding line ROW0, and the data bit variation of row ROW1 is " 11 ", " 10 ", " 00 ", " 01 " in proper order.Control module 1 is gone up this data variation of two according to data pin DATA, and judging has rotation, according to the rule of data variation, judges sense of rotation.
Embodiment 2:
With reference to Fig. 4, in the present embodiment, control module 1 adopts CPU, selects clock pin CLK, frame synchronization pin CLR, the data pin DATA of the serial port of control module 1 for use, realizes reading scanning, control and the key assignments of matrix keyboard 2.Scan control module 3 is made up of counter 31 sum counters 32, and counter 31 sum counters 32 adopt 4 binary counter 74HC393, and line scanning module 4 selects for use 16 path analoging switch 74HC4067, column scan module 5 to select 8 path analoging switch 74HC4051 for use.The input end of clock of counter 31 connects the clock pin CLK of control module 1, the reset pin MR of counter 31 sum counters 32 connects the frame synchronization pin CLR of control module 1, in the present embodiment, the output of counter 31 is used 4, the output of counter 32 is used 3, the carry-out bit Q0 of counter 31, Q1, Q2, Q3 is connected to the channel selecting input end A of line scanning module 4 successively, B, C, D, the highest carry-out bit Q3 of counter 31 is the input end of clock of linkage counter 32 simultaneously, the carry-out bit Q0 of counter 32, Q1, Q2 is connected to the channel selecting input end A of column scan module 5 successively, B, C.
In the present embodiment, the passage input and output pin X1 of line scanning module 4～X9 is the capable pin ROW0～ROW8 of connection matrix keyboard 2 respectively, the public input and output pin X of line scanning module 4 connects the data pin DATA of control module 1, the passage input and output pin X0 of column scan module 5～X7 is the row pin COL0～COL7 of connection matrix keyboard 2 respectively, the public input and output pin X ground connection of column scan module 5.
In the present embodiment,, can realize one 16 * 8 matrix because line scanning module 4 has selected for use 16 analog switch 74HC4067, column scan module 5 to select 8 path analoging switch 74HC4051 for use.Used 27 buttons in the present embodiment, 12 incremental encoders 6, totally 63 key assignments are connected in wherein 8 row, 8 row.The capable ROW0 of matrix keyboard 2～ROW8 uses 10k resistance to be connected to power supply VCC, makes acquiescence be output as height.
The present embodiment course of work is identical with embodiment 1.
Explanation as an example, line scanning module 4 can be selected any analog switch for use,
Explanation as an example, column scan module 5 can be selected any analog switch for use,
Explanation as an example, matrix keyboard 2 can be a key board,
Explanation as an example, matrix keyboard 2 can be the incremental encoder keyboard,
Explanation as an example, matrix keyboard 2 can be the keyboards of button and incremental encoder combination.
From embodiment 1 and embodiment 2 as can be seen, the utility model only utilizes clock pin, frame synchronization pin and the data pin of (1) serial ports of control module, just realized the function that scanning, control and key assignments to matrix keyboard (2) read, only taken the less resource of control module (1), and the array of matrix keyboard (2) can be expanded according to actual needs.If the analog switch in the line scanning module is the N path analoging switch, the analog switch in the column scan module is the M path analoging switch, then can realize the scanning of the keyboard matrix of N * M at most, this moment analog switch way at least greater than the maximal value of counter output.Extended keyboard only needs the way of increase analog switch just can realize if desired.
Claims (7)
1. the oscillograph with keyboard scanning circuit comprises a matrix keyboard, and one is used for the control module that supervisory keyboard scans and key assignments reads, and it is characterized in that:
Also comprise one scan control module, delegation's scan module, a column scan module,
Described control module provides clock signal by a clock pin to the scan control module, and described control module provides synchronizing signal by a frame synchronization pin to the scan control module,
Described scan control module provides gating signal to described line scanning module, and described scan control module provides capable gating signal to described column scan module,
Described line scanning module provides line scan signals to described matrix keyboard, and described line scanning module is obtained key assignments and delivered to a data pin of control module from described matrix keyboard,
Described column scan module provides column scan signal to described matrix keyboard.
2. the oscillograph with keyboard scanning circuit according to claim 1, it is characterized in that: described scan control module comprises one first counter and one second counter, the input end of clock of described first counter connects the clock pin of described control module, the reset pin of described first counter and second counter is connected the frame synchronization pin of control module, the carry-out bit of described first counter is connected to the channel selecting input end of described line scanning module successively, the highest carry-out bit of described first counter connects the input end of clock of described second counter, and the carry-out bit of described second counter is connected to the channel selecting input end of described column scan module successively.
3. the oscillograph with keyboard scanning circuit according to claim 2, it is characterized in that: described line scanning module is made up of a multiway analog switch, the capable pin of the passage input and output pin connection matrix keyboard of described multiway analog switch, public input and output pin connects the data pin of control module, the maximal value that the way of described analog switch is exported greater than first counter at least.
4. the oscillograph with keyboard scanning circuit according to claim 2, it is characterized in that: described column scan module is made up of a multiway analog switch, the public input and output pin ground connection of described multiway analog switch, the maximal value that the row pin of the passage input and output pin connection matrix keyboard of multiway analog switch, the way of described analog switch are exported greater than second counter at least.
5. according to claim 1,2,3 or 4 described oscillographs with keyboard scanning circuit, it is characterized in that: described matrix keyboard is a key board.
6. according to claim 1,2,3 or 4 described oscillographs with keyboard scanning circuit, it is characterized in that: described matrix keyboard is the incremental encoder keyboard.
7. according to claim 1,2,3 or 4 described oscillographs with keyboard scanning circuit, it is characterized in that: described matrix keyboard is the keyboard of button and incremental encoder combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203507046U CN201589802U (en) | 2009-12-25 | 2009-12-25 | Oscilloscope with keyboard scanning circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203507046U CN201589802U (en) | 2009-12-25 | 2009-12-25 | Oscilloscope with keyboard scanning circuit |
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| CN201589802U true CN201589802U (en) | 2010-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009203507046U Expired - Lifetime CN201589802U (en) | 2009-12-25 | 2009-12-25 | Oscilloscope with keyboard scanning circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108874164A (en) * | 2016-01-05 | 2018-11-23 | 湖南工业大学 | A kind of matrix keyboard reversal process scan method |
| CN109407854A (en) * | 2018-10-09 | 2019-03-01 | 长沙幻音电子科技有限公司 | Computer keyboard with MIDI controller function |
| CN109656176A (en) * | 2018-12-26 | 2019-04-19 | 中电科仪器仪表有限公司 | A kind of oscillograph control panel circuit and its control method and oscillograph |
| CN109918179A (en) * | 2017-12-13 | 2019-06-21 | 合肥欣奕华智能机器有限公司 | A kind of button processing method, equipment and system |
-
2009
- 2009-12-25 CN CN2009203507046U patent/CN201589802U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108874164A (en) * | 2016-01-05 | 2018-11-23 | 湖南工业大学 | A kind of matrix keyboard reversal process scan method |
| CN108874164B (en) * | 2016-01-05 | 2021-03-16 | 湖南工业大学 | Matrix keyboard inversion method scanning method |
| CN109918179A (en) * | 2017-12-13 | 2019-06-21 | 合肥欣奕华智能机器有限公司 | A kind of button processing method, equipment and system |
| CN109407854A (en) * | 2018-10-09 | 2019-03-01 | 长沙幻音电子科技有限公司 | Computer keyboard with MIDI controller function |
| CN109656176A (en) * | 2018-12-26 | 2019-04-19 | 中电科仪器仪表有限公司 | A kind of oscillograph control panel circuit and its control method and oscillograph |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100922 |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Rigol Technologies, Inc. Document name: Notification of Expiration of Patent Right Duration |