CN105024680A - Data sending and button detection multiplexing circuit and processing method of program thereof - Google Patents
Data sending and button detection multiplexing circuit and processing method of program thereof Download PDFInfo
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- CN105024680A CN105024680A CN201510427621.2A CN201510427621A CN105024680A CN 105024680 A CN105024680 A CN 105024680A CN 201510427621 A CN201510427621 A CN 201510427621A CN 105024680 A CN105024680 A CN 105024680A
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Abstract
A data sending and button detection multiplexing circuit is composed of an MCU, a display screen module, a power supply, an STB signal wire, a CLK signal wire, a DATA signal wire, a button matrix circuit, a pull-down resistor and a filtering capacitor. A data sending circuit and a button detection circuit are multiplexed, and display data sending and button signal detection are realized by time sharing processing of software. By the improvement of the above structure, the number of MCU ports is effectively reduced, and the number of flexible flat cables is reduced, so that the material cost and the processing cost are lowered. The data sending and button detection multiplexing circuit is advantageous by being simple and reasonable in structure, reliable in performance, low in material cost, convenient to process, easy to produce, easy to realize and high in practicability.
Description
Technical field
The present invention relates to the transmission of a kind of data and detect multiplexing circuit and the processing method of program thereof with button.
Background technology
In the household electrical appliances of prior art and field of consumer electronics, it is generally essential that display driver and button detect.In the current age with keen competition, the cost pressure of enterprise is comparatively large, and as when MCU type selecting, sometimes in order to the how several port of needs, may will change the chip of another specification, result causes the wasting of resources, cost increase.In addition, in the application scenario that mainboard is separated with keypad, winding displacement is more, and process more complicated, cost also goes up thereupon, cannot meet the Production requirement of enterprise.Therefore, further improvement is necessary.
Summary of the invention
Object of the present invention aims to provide a kind of simple and reasonable, dependable performance, and Material Cost is low, easy to process, easily produces, and the data easily realized send and detect multiplexing circuit and the processing method of program thereof, to overcome weak point of the prior art with button.
A kind of data designed by this object send and detect multiplexing circuit with button, it is characterized in that: be made up of MCU, display screen module, power supply, STB holding wire, CLK holding wire, DATA holding wire, key-press matrix circuit, pull down resistor and filter capacitor.
Described power supply passes through+5V line and GND line is supplied and C4 and C5 be connected in order to steady voltage and filter out power clutter by mainboard;
Described STB holding wire, CLK holding wire, DATA holding wire are connected to the MCU port of mainboard respectively, and are connected to pull down resistor R4, R5, R6 and filter capacitor C1, C2, C3 respectively, with set key-press input signal as high level effective;
Described key-press matrix circuit is cross connected to STB holding wire, CLK holding wire, DATA holding wire respectively by R1, R2, R3 and D1, D2, D3, D4, D5, D6 and K1, K2, K3, K4, K5, K6;
Described filter capacitor is in order to eliminate the interference of key-press input signal.
A kind of data send and detect multiplexing circuit program processing method with button, comprise above-mentioned data transmission and detect multiplex circuit with button, it is characterized in that: data transmit circuit and key press detecting circuit multiplexing, realize the display transmission of data and the detection of push button signalling by software time-division processing.
Described software time-division processing is during scanning button, and in turn one of them port is set to delivery outlet respectively, and exports high level, another two ports are set to input port, and whether detection is high level, thus judges which button is pressed; After key scan, just perform data to send, when sending data to the LED drive chip of display screen module, the STB holding wire that MCU connects, CLK holding wire, DATA holding wire port are all set to delivery outlet, during sending data to display screen module, because each button have been connected a diode by the unified sense of current of specifying, so whether button is pressed also do not affect the level of holding wire, namely key-press status does not affect the transmission of data, actuation of keys is left in the basket, and does not namely now detect key-press status.
The present invention by the improvement of said structure, 1, reduce and take the hardware resource of MCU, and decrease the quantity of winding displacement, reduce Material Cost and processing cost; 2, software deals with simple and convenient, clear logic, neither affects the transmission of data, also accurately can detect the state of button; 3, the method is easy-to-understand, can not be designed person well and grasps and be applied in actual design.
The features such as it has simple and reasonable, dependable performance, and Material Cost is low, easy to process, easily produces, easy realization, practical.
Accompanying drawing explanation
Fig. 1 is the circuit frame figure of first embodiment of the invention.
Fig. 2 is the circuit theory diagrams of first embodiment of the invention.
Fig. 3 is the sequential chart of the software process of first embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
See Fig. 1, Fig. 2, notebook data sends and detects multiplexing circuit with button, is made up of MCU, display screen module, power supply, STB holding wire, CLK holding wire, DATA holding wire, key-press matrix circuit, pull down resistor and filter capacitor.
First, STB holding wire, CLK holding wire, DATA holding wire and+5V line, GND line directly dock with display screen module; Then, STB holding wire, CLK holding wire, DATA holding wire are connected to pull down resistor R4, R5, a R6 respectively, under setting button detected state, button is not pressed as low level, button is pressed as high level, STB holding wire, CLK holding wire, DATA holding wire are connected to filter capacitor C1, C2, C3 respectively, disturb in order to filtering clutter.
Key-press matrix circuit is cross connected to STB holding wire, CLK holding wire, DATA holding wire respectively by R1, R2, R3 and D1, D2, D3, D4, D5, D6 and K1, K2, K3, K4, K5, K6.
Specifically, STB holding wire, CLK holding wire, DATA holding wire connect successively in the following manner: a wherein holding wire is received in wherein one end (as push button signalling input) of two buttons, the other end (as push button signalling output) of these two buttons receives other two holding wires respectively, get off like this and have 3 to combination, namely can connect at most 6 buttons.And each button to be connected a diode by the unified sense of current of specifying, and when preventing two buttons from pressing, causes short circuit between two holding wires and cannot normally work simultaneously.
Filter capacitor is in order to eliminate the interference of key-press input signal.
Data send and detect multiplexing circuit program processing method, see Fig. 3 with button.
In the t1 moment, STB port is set to delivery outlet, and exports high level, CLK and DATA port is set to input state.Then read the input state of CLK and DATA port respectively, if CLK Port detecting is to high level, then K1 by under, if DATA Port detecting is to high level, then K2 by under.
In the t2 moment, CLK port is set to delivery outlet, and exports high level, STB and DATA port is set to input state.Then read the input state of STB and DATA port respectively, if STB Port detecting is to high level, then K3 by under, if DATA Port detecting is to high level, then K4 by under.
In the t3 moment, DATA port is set to delivery outlet, and exports high level, CLK and STB port is set to input state.Then read the input state of CLK and STB port respectively, if CLK Port detecting is to high level, then K5 by under, if STB Port detecting is to high level, then K6 by under.
To the t4 moment, STB, CLK and DATA port is all set to delivery outlet, press the agreement of the LED drive chip in display screen module, send chip to LED drive chip and instruction and display data are set, now key-press status is left in the basket, namely do not detect key-press status, after waiting pending data to be sent, repeat the process of above-mentioned t1 ~ t4.
Above-mentioned is preferred version of the present invention, and those of ordinary skill in the art, to its simple modification or transformation, all drop within protection scope of the present invention.
Claims (4)
1. data send and detect a multiplexing circuit with button, it is characterized in that: be made up of MCU, display screen module, power supply, STB holding wire, CLK holding wire, DATA holding wire, key-press matrix circuit, pull down resistor and filter capacitor.
2. data send and detect multiplexing circuit with button according to claim 1, it is characterized in that: described power supply passes through+5V line and GND line is supplied and C4 and C5 be connected in order to steady voltage and filter out power clutter by mainboard;
Described STB holding wire, CLK holding wire, DATA holding wire are connected to the MCU port of mainboard respectively, and are connected to pull down resistor R4, R5, R6 and filter capacitor C1, C2, C3 respectively, with set key-press input signal as high level effective;
Described key-press matrix circuit is cross connected to STB holding wire, CLK holding wire and DATA holding wire respectively by R1, R2, R3 and D1, D2, D3, D4, D5, D6 and K1, K2, K3, K4, K5, K6;
Described filter capacitor is in order to eliminate the interference of key-press input signal.
3. data send and detect multiplexing circuit program processing method with button, comprise data according to claim 2 transmission and detect multiplex circuit with button, it is characterized in that: data transmit circuit and key press detecting circuit multiplexing, realize the display transmission of data and the detection of push button signalling by software time-division processing.
4. data send and detect multiplexing circuit program processing method with button according to claim 3, it is characterized in that: described software time-division processing is during scanning button, in turn one of them port is set to delivery outlet respectively, and export high level, another two ports are set to input port, and whether detection is high level, thus judge which button is pressed; After key scan, just perform data to send, when sending data to the LED drive chip of display screen module, the STB holding wire that MCU connects, CLK holding wire, DATA holding wire port are all set to delivery outlet, during sending data to display screen module, because each button have been connected a diode by the unified sense of current of specifying, so whether button is pressed also do not affect the level of holding wire, namely key-press status does not affect the transmission of data, actuation of keys is left in the basket, and does not namely now detect key-press status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510427621.2A CN105024680A (en) | 2015-07-20 | 2015-07-20 | Data sending and button detection multiplexing circuit and processing method of program thereof |
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| CN201510427621.2A CN105024680A (en) | 2015-07-20 | 2015-07-20 | Data sending and button detection multiplexing circuit and processing method of program thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106027067A (en) * | 2016-02-29 | 2016-10-12 | 苏州达方电子有限公司 | Key matrix |
| CN108958090A (en) * | 2017-05-22 | 2018-12-07 | 比亚迪股份有限公司 | Circuit and control method, the household electrical appliance and consumer electronics device of multiplexing port |
| CN110190841A (en) * | 2019-06-06 | 2019-08-30 | 深圳市兆威机电股份有限公司 | I/O port multiplexing control circuit and electronic equipment |
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| CN101738951A (en) * | 2008-11-24 | 2010-06-16 | 苏州市职业大学 | Key input and display output dual-purpose circuit of singlechip |
| US20110102053A1 (en) * | 2008-07-31 | 2011-05-05 | Actions Semiconductor Co., Ltd. | Method and soc for implementing time division multiplex of pin |
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| CN204794958U (en) * | 2015-07-20 | 2015-11-18 | 广东格兰仕集团有限公司 | Data transmission detects multiplexing circuit with button |
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| CN2746454Y (en) * | 2004-11-25 | 2005-12-14 | 朱衡 | LED display device of computer main frame |
| US20110102053A1 (en) * | 2008-07-31 | 2011-05-05 | Actions Semiconductor Co., Ltd. | Method and soc for implementing time division multiplex of pin |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106027067A (en) * | 2016-02-29 | 2016-10-12 | 苏州达方电子有限公司 | Key matrix |
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| CN108958090A (en) * | 2017-05-22 | 2018-12-07 | 比亚迪股份有限公司 | Circuit and control method, the household electrical appliance and consumer electronics device of multiplexing port |
| CN110190841A (en) * | 2019-06-06 | 2019-08-30 | 深圳市兆威机电股份有限公司 | I/O port multiplexing control circuit and electronic equipment |
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