KR100319576B1 - Multi Signal Input Device - Google Patents

Abstract

In the portable communication terminal, a plurality of key signal inputs having a matrix structure can be detected through a single port of the main processor. A key for generating a voltage drop according to the selection of a contact and outputting a voltage level corresponding to the selected contact Converts the voltage level of the analog state applied from the selection input means, the key detection input means, and outputs an interrupt signal when the voltage change is detected from the key selection input means by selecting the key signal; The analog-to-digital converting means and the voltage detecting means are connected to a single input port, the analog-digital converting means are connected to a single input port, and are determined as key selection when an interrupt signal is applied from the voltage detecting means. Enable the next voltage detected Recognizing the position of the key selected from the level of the voltage applied from the access to the control data, characterized in that the main processor for outputting a function control signal, it is possible to efficiently use the limited input port of the main processor, By minimizing the processor's input port, the product can be made smaller and lighter.

Description

Multi Signal Input Device

The present invention relates to a signal input device, and more particularly, to a multiple signal input device for detecting a plurality of key signal inputs having a matrix structure in a portable communication terminal through a single port of a main processor.

A multiple signal input device for inputting and detecting a key signal for selecting a function desired by a user in various conventional electronic devices, portable communication terminals, and the like, as shown in FIG. 2, is a key selection for executing a user desired operation. A key selection input unit 10 for inputting a signal and a main processor 20 for executing a corresponding operation according to the input key selection signal, wherein one terminal is connected to the power supply terminal (Vcc), the other terminal A switching contact of a switch S / W having one terminal connected to ground is connected, a resistor R10 for dropping a supply voltage of the power supply terminal Vcc to a set level to a predetermined value, and the switch S / W. A key select input unit 10 composed of a capacitor C10 which connects the switching contact of W) and the ground in parallel to generate a voltage drop by the charge / discharge operation when the switch S / W is switched on. The GPIO (General Purpose I / O) of the resistor (R10) the main processor 20 is connected to the output terminal of the one-to-one correspondence with each input port.

Therefore, as the key selection input unit 10 increases, the GPIO input port of the main processor 20 also increases.

The operation of the conventional multi-signal input device having the technical configuration as described above is as follows.

When an arbitrary key is selected to execute a function required by a user in any electronic device or portable terminal having a matrix of N × M, the switch (S / W) of the key selection input unit 10 having the structure of FIG. Since the contact of is switched on, the power supply terminal (Vcc) and ground are formed in a closed circuit.

Accordingly, since the supply voltage of the power supply terminal Vcc generates a potential difference by the resistor R10, and the generated potential difference is input as an interrupt signal to the GPIO port of the main processor 20, the main processor 20 receives an interrupt input. A program corresponding to the signal is accessed from the internal memory means to execute the corresponding function through the function execution means not shown.

In the conventional multi-signal input apparatus as described above, the GPIO interrupt port of the main processor which analyzes the input means of the key selection signal and the selected function and executes the corresponding function has a one-to-one correspondence. Since the input port of the processor is increased, a problem arises in that the use of the limited input / output port of the main processor occurs.

In addition, when the function of the electronic device or the portable terminal is added, the GPIO interrupt port of the main processor is also increased due to an increase in the corresponding key selection input means, thereby increasing the size of the main processor.

This is presented as a difficulty in hybridizing various internal components hardware for compactness, light weight, and slip in order to meet user's desires and provide convenience for carrying and using, and it is possible to reduce various sizes of electronic devices and portable terminals. Produces a problem that cannot be manufactured with.

In addition, since the structure of the key selection input unit is complicated, there is a problem in that repair and recovery are difficult when a failure occurs, and a problem arises in that the limited space of the case cannot be used efficiently.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a multi-key selection signal of a key selection input means consisting of N × M to execute a function desired by a user in various electronic devices or portable terminals. Interrupt through to execute various functions corresponding to the selection, and to minimize the input port of the main processor to provide a compact, lightweight and slip of the product.

In addition, it provides an efficiency in the use of the input port of the main processor, and simplified the structure of the key input means to efficiently use the limited space of the product.

1 is a block diagram illustrating a multiple signal input apparatus according to an embodiment of the present invention.

2 is a block diagram illustrating a conventional multiple signal input device.

According to an aspect of the present invention, there is provided a portable electronic device comprising: key selection input means for outputting a voltage level corresponding to a selected contact by generating a voltage drop according to selection of a contact point;

Voltage detection means for judging selection of a key signal and outputting an interrupt signal when a change in voltage is detected from the key selection input means;

Analog-to-digital converting means for converting and outputting a voltage level of an analog state applied from said key selection input means into a digital signal;

The voltage detecting means is connected to a single input port, the analog-to-digital converting means is connected to a single input port, and when an interrupt signal is applied from the voltage detecting means, it is determined by key selection and enabled, and then the voltage is detected. And a main processor for recognizing the position of the key selected from the level of the voltage applied from the means, accessing the corresponding control data, and outputting a function control signal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in the accompanying FIG. 1, the multiple signal input device according to the present invention comprises a key selection input unit 1, a voltage detector 2, an analog-to-digital converter 3, and a main processor 4. The key selection input unit 1 has a predetermined value connected to the power supply terminal Vcc in series by the number of switching of the resistors R1-Rn, and between the first resistor R1 and the second resistor R2. The second switch S2 of which one terminal of the first switch S1 having one terminal connected to the ground is connected, and the one terminal of which is connected to the ground between the second resistor R2 and the third resistor R3. The other terminal of the second terminal of the third switch (S3) is connected between the third resistor (R3) and the fourth resistor (R4) of the third switch (S3) connected to the ground, the N-1 resistor The other terminal of the N-1 switch Sn-1, in which one terminal is connected to ground, is connected between Rn-1 and the Nth resistor Rn, and the Nth resistor Rn One terminal of the output terminal side is connected to the other end unit of the N switches (Sn) on the side connected to ground.

The key selection input unit 1 connected as described above outputs information on the contact position of the selected switch by dropping the power supplied from the power supply terminal Vcc through a resistor when an arbitrary switch contact is switched.

The voltage detector 2 outputs an interrupt signal for selecting an arbitrary switch when detecting a change in the voltage applied from the key selection input unit 1 to the node "A".

The analog-digital converter 3 converts an analog signal applied to the node " A " point into a digital signal as an arbitrary switch is switched in the key select input unit 1, and outputs the digital signal.

The main processor 4 is connected to the voltage detector 2 through one port a. When the interrupt signal for the voltage change is detected through the port “a”, the main processor 4 is enabled and applied as a digital signal through the port “B”. The position of the selected switching contact is determined from the signal to be used, and then the corresponding function is controlled by accessing the corresponding data from the memory means to execute the selected function.

In the present invention having the function as described above, the operation of inputting and detecting the key selection signal is as follows.

In order to select a function required by a user in any electronic device or portable terminal having the above-described configuration, the user may select an arbitrary key from among ten keys (0-9) and a plurality of function keys provided in the key selection input unit 1. The contact of the corresponding switch is switched to the switching on state.

For example, if the key selected by the user is the contact point of the first switch S1, the power of the power supply terminal Vcc supplied through the voltage drop of the resistor Vcc is grounded through the contact point of the first switch S1. Since it is induced, the voltage across the node " A " point is formed at " 0 " V.

In another example, when the user-selected key selects the contact point of the second switch S2, the voltage detected by the node “A” through the voltage drop between the first resistor R1 and the second resistor R2 is Becomes

In another example, when the contact point of the third switch S3 is selected as the key selected by the user, the node “A” may be reduced through the voltage drop of the first resistor R1, the second resistor R2, and the third resistor R3. The voltage detected at " Becomes

Therefore, when the contact of the N-th switch of the key selection input unit 1 is selected, the voltage detected at the node "A" through the voltage drop of N resistors is Becomes

In this case, when the voltage detector 2 analyzes the voltage applied from the node “A” and detects a change in voltage, the voltage detector 2 determines that an arbitrary switch is selected from among a plurality of switches included in the key selection input unit 1, and a signal thereof is selected. Is applied as an interrupt to port "a" of the main processor 4.

At the same time, the analog-to-digital converter 3 converts the analog voltage applied from the node " A " into a digital signal and supplies information about it to the " b " port of the main processor 4.

Therefore, the main processor 4 is enabled by the interrupt information for the key selection applied to the "a" port, is converted into a digital signal, reads the position of the selected switch from the applied key selection signal, and then stored in the memory means. Access the corresponding control data and output a control signal for controlling the corresponding function.

Alternatively, instead of using the voltage detector 2 in the present invention, the output of the analog-to-digital converter 3 may be implemented using an algorithm in which the main processor 4 polls.

Polling is to check a certain device continuously at a predetermined time interval, and a case of implementing a multi-signal input device according to the present invention by applying a polling algorithm will be described.

When the polling algorithm is applied, the voltage detector 2 shown in FIG. 1 is unnecessary, and the main processor 4 repeatedly reads the output of the analog-to-digital converter 3 every predetermined time to check whether there is a change in value. Polling is performed in such a scheme so that the main processor 4 periodically enables the analog-digital processing routine to read the value of the analog-to-digital converter 3, so that an enable interrupt applied to the "a" port is unnecessary.

Therefore, when a change in the value of the analog-to-digital converter 3 is detected by polling, the main processor 4 can determine which key is pressed through the sensed digital value.

At this time, the polling period may be controlled by an operating system or, in the absence of an operating system, may be determined using a delay circuit having a time coefficient or a predetermined delay time provided by a timer provided inside and outside the main processor 4.

As described above, in a variety of electronic devices and portable information terminals having a plurality of key input means, the key selection signal output from the key input means is detected through the voltage drop and output as an interrupt signal to a single input port. By recognizing the position of the selected key from the applied voltage level to execute the corresponding control function, the limited input port of the main processor can be efficiently used, and the miniaturization and weight of the product can be provided by minimizing the input port of the main processor.

In addition, by simplifying the structure of inputting the key selection signal, it is possible to efficiently use the limited storage space, and provides convenience and speed for repair and recovery in the event of a failure.

Claims (3)

A portable electronic device comprising: key selection input means for generating a voltage drop according to selection of a contact point and outputting a level of a voltage corresponding to the selected contact point; Voltage detection means for judging selection of a key signal and outputting an interrupt signal when a change in voltage is detected from the key selection input means; Analog-to-digital converting means for converting and outputting a voltage level of an analog state applied from said key selection input means into a digital signal; The voltage detecting means is connected to a single input port, the analog-to-digital converting means is connected to a single input port, and when an interrupt signal is applied from the voltage detecting means, it is determined by key selection and enabled, and then the voltage is detected. And a main processor for recognizing the position of the key selected from the level of voltage applied from the means, accessing the corresponding control data, and outputting a function control signal. The method according to claim 1, wherein the key selection input means has a resistor having a predetermined value connected to the power supply terminal (Vcc) in series by N number of switching, and each switch contact (N) has one terminal connected to ground and the other one side. And a terminal is connected between the resistor (N-1) and the resistor (N) connected in series. The method of claim 1, wherein the main processor detects a key selection through polling of an input digital signal instead of an interrupt of the voltage detecting means, and recognizes a selected position according to a digital input voltage level to execute a corresponding function. Multiple signal input device, characterized in that for outputting a control signal for.