KR100687225B1 - Apparatus and method for improving of key recognition accuracy in multi key demanded terminal - Google Patents

Abstract

The present invention provides an apparatus and method for improving key recognition accuracy in a terminal requiring a plurality of keys, comprising: an MCU having an ADC port and an interrupt port and checking the ADC value to perform key mapping; A keypad enable logic providing unit to provide keypad enable logic to the MCU; A keypad having a plurality of keys; When a key value is input from the keypad, a key input voltage level is generated and a key input voltage level generating unit is configured to transmit the key value to the MCU through the ADC port and the interrupt port so that the key value is correctly recognized. In portable terminals requiring multiple keys for input of letters and numbers, the port and related resources used for key recognition can be minimized and stability can be improved by improving the accuracy of key recognition.

Description

Apparatus and method for improving of key recognition accuracy in multi key demanded terminal}

1 is a block diagram of a key input device using a key matrix in a terminal which requires a plurality of keys.

2 is a block diagram of an apparatus for improving key recognition accuracy in a terminal requiring a plurality of keys according to the present invention;

3 is a flowchart illustrating a method of improving key recognition accuracy in a terminal requiring multiple keys.

Explanation of symbols on the main parts of the drawings

1: MCU 2: port

3: keypad 10: MCU

11: ADC Port 12: Interrupt Port

20: keypad enable logic providing unit 30: keypad

40: key input voltage level generating unit 41 ~ 44: keypad value output unit

45: reference voltage output unit for the ADC 46: reference voltage output unit for the interrupt

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal requiring a plurality of keys, and in particular, a port and related resources used for key recognition in a portable terminal requiring a plurality of keys for input of letters and numbers, such as an instant messaging (IM) phone. The present invention relates to a device and a method for improving the accuracy of key recognition in a terminal requiring a plurality of keys suitable for increasing stability by minimizing the accuracy of the key recognition.

In general, a portable terminal refers to a small terminal device which can be carried by one hand and is made to be input and operated by a hand while moving.

Such portable terminals use a plurality of keys for input of letters, numbers or special symbols.

To this end, conventionally, rows and columns are configured in a matrix according to the number of keys applied, and a MCU (Main Control Unit) is used for key chattering. It uses a structure that recognizes an input, or a structure that applies a separate converter device to the outside.

1 is a block diagram of a key input device using a key matrix in a terminal which requires a plurality of keys.

As shown therein, reference numeral 1 denotes a MCU which performs a main function of a device, 2 denotes a port which is located in the MCU and receives a signal input from a keypad, and 3 denotes a plurality of keys configured in a matrix manner. The keypad transfers a key value to the MCU 1 through a port 2.

Referring to the operation of the conventional device configured as described in more detail as follows.

First, when any one of the plurality of keys Key_11 to Key_11 is pressed by the user in the keypad 3, the signal of the corresponding key is transmitted to the port 2 of the MCU 1. Then, the key value received through the port 2 is interpreted by the MCU 1 to recognize the corresponding key value.

For example, when Key_11 is pressed, a signal between Column1 and Row1 of port 2 is connected. Then, the MCU 1 recognizes that the signals of Column1 and Row1 are connected and recognizes that the Key_11 key of the keypad 3 is pressed.

On the other hand, when the converter device is applied to the outside, the key value is input using the converter's external integrated circuit (IC).

However, this conventional technology has the following problems.

That is, in the case of using the key matrix, the port of the MCU 1 should be proportionally allocated as the number of keys to be applied to the terminal increases, and when the limit of the number of ports is reached, no further key application is possible. there was.

In addition, when the device for the converter is applied to the outside, a separate material cost increases accordingly, there is a disadvantage that the operation to stabilize the control logic is inevitably required.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, an object of the present invention is to be used for key recognition in a portable terminal that requires a plurality of keys for inputting letters and numbers, such as IM phones The present invention provides a device and method for improving key recognition accuracy in a terminal requiring a plurality of keys that can increase stability by minimizing port and related resources and improving accuracy of key recognition.

In order to achieve the above object, an apparatus for improving key recognition accuracy in a terminal requiring a plurality of keys according to an embodiment of the present invention,

An MCU having an ADC port and an interrupt port and performing key mapping by checking an ADC value; A keypad enable logic providing unit to provide keypad enable logic to the MCU; A keypad having a plurality of keys; When a key value is input from the keypad, a key input voltage level is generated and the key input voltage level generator is configured to transmit the key value to the MCU through the ADC port and the interrupt port. It is done.

In order to achieve the above object, a method of improving key recognition accuracy in a terminal requiring a plurality of keys according to an embodiment of the present invention is provided.

A first step of performing an ADC by switching to a mode for using the keypad when the keypad is enabled; A second step of maintaining a key input standby state if there is no key input even after a predetermined time elapses after the first step; And a third step of checking the ADC value, performing key mapping, and returning to the second step after the second step to prevent the key input read error if there is a key input after the second step. Features of the jacket.

Hereinafter, an embodiment according to the present invention, an apparatus for improving key recognition accuracy in a terminal requiring a plurality of keys, and a technical concept of the method will be described with reference to the accompanying drawings.

2 is a block diagram of an apparatus for improving key recognition accuracy in a terminal requiring a plurality of keys according to the present invention.

As shown in the figure, the MCU 10 having an ADC port 11 and an interrupt port 12 and performing key mapping by checking an analog-to-digital conversion (ADC) value )Wow; A keypad enable logic providing unit (20) for providing keypad enable logic to the MCU (10); A keypad 30 having a plurality of keys; When a key value is input from the keypad 30, a key input voltage level is generated and transmitted to the MCU 10 through the ADC port 11 and the interrupt port 12 to accurately recognize the key value. It is configured to include a level generating unit 40.

The key input voltage level generator 40 may include a keypad value output unit 41 to 44 that outputs a keypad value to the ADC port 11 in the MCU 10 when a key of the keypad 30 is pressed. ; An ADC reference voltage output unit 45 connected between the keypad value output units 41 to 44 and the ADC port 11 in the MCU 10 to output an ADC reference voltage; An interrupt reference voltage output unit 46 connected between the keypad 30 and the keypad value output units 41 to 44 and connected to an interrupt port 12 in the MCU 10 to output an interrupt reference voltage. It is configured to include).

The keypad enable logic providing unit 20 switches to a mode for using the keypad to perform the ADC when the keypad is enabled, and maintains a key input standby state when there is no key input even after a predetermined time elapses. If there is a key input, the MCU 10 provides keypad enable logic that checks the ADC value, performs key mapping, and maintains a key input read state after the interrupt value is changed to prevent a key input read error.

In the above description, Key_1 to Key_n denote a plurality of keys in the keypad, V_KEY is voltage, R_ref is reference resistance, R1 to Rn are resistors assigned to each key, and ADC point is keypad value output unit 41. 44) and a point between the ADC reference voltage output section 45 and the ADC port 11.

3 is a flowchart illustrating a method of improving key recognition accuracy in a terminal requiring multiple keys.

As shown therein, a first step (ST11 to ST13) of performing the ADC by switching to a mode for using the keypad when the keypad is enabled; A second step (ST14) (ST15) of maintaining a key input standby state if there is no key input even after a predetermined time elapses after the first step; If there is a key input after the second step, the third step (ST16 to ST19) includes checking the ADC value, performing key mapping, changing the interrupt value, and returning to the second step to prevent a key input read error. Perform.

The third step ST16 to ST19 may include determining whether an interrupt value is low after the second step (ST16); Determining that there is no key input if the interrupt value is not low, and performing the second step; and performing an ADC by determining that there is a key input if the interrupt value is low (ST17); Checking the ADC value and performing key mapping after performing the ADC (ST18); Determining whether an interrupt value is high after performing the ADC value check and key mapping (ST19); If the interrupt value is not high, the keypad 30 determines that one key is in a pressed state and maintains a standby state. When the interrupt value is high, the controller 30 returns to the second step to input a new key value. It further comprises the steps.

An apparatus and method for improving key recognition accuracy in a terminal requiring a plurality of keys according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention aims to accurately recognize a key value while minimizing a port and related resources used for key recognition in a portable terminal requiring a plurality of keys for inputting letters and numbers, such as an IM phone.

Thus, as shown in FIG. 2, the MCU 10, the keypad enable logic providing unit 20, the keypad 30, and the key input voltage level generator 40 are configured.

The MCU 10 includes an ADC port 11 and an interrupt reference voltage for receiving outputs from the keypad value output units 41 to 44 and the ADC reference voltage output unit 45 in the key input voltage level generator 40. The interrupt port 12 which receives the output from the output part 46 is provided. Also check the ADC value to perform key mapping. In addition, the keypad enable logic is provided from the keypad enable logic provider 20 to perform the key recognition.

The keypad enable logic provider 20 provides keypad enable logic to the MCU 10. Here, the keypad enable logic means that when the keypad is enabled, the ADC is switched to the mode for using the keypad to perform the ADC, and if there is no key input after a certain time, the key input wait state is maintained. It is logic that checks, performs key mapping, and keeps waiting for key input after interrupt value is changed to prevent key input read error.

The keypad 30 includes a plurality of keys Key_1 to Key_n to input key values.

The key input voltage level generator 40 generates a key input voltage level when the key value is input from the keypad 30, and transmits the key input voltage level to the MCU 10 through the ADC port 11 and the interrupt port 12. Make sure it is recognized correctly.

The key input voltage level generator 40 includes a keypad value output unit 41 to 44, an ADC reference voltage output unit 45, and an interrupt reference voltage output unit 46.

The keypad value output parts 41 to 44 output the keypad value to the ADC port 11 in the MCU 10 when a key of the keypad 30 is pressed, and is made of a resistor assigned to each key.

The reference voltage output unit 45 for the ADC is connected between the keypad value output units 41 to 44 and the ADC port 11 in the MCU 10 to receive a reference voltage V_KEY to output the reference voltage for the ADC. It consists of (R_ref).

Thus, when the key of the keypad 30 is pressed to the ground state, the key value is transmitted to the ADC port 11 through the keypad value output parts 41 to 44.

The interrupt reference voltage output unit 46 is connected between the keypad 30 and the keypad value output units 41 to 44, and is connected to an interrupt port 12 in the MCU 10 to output an interrupt reference voltage. It consists of the reference resistance (R_ref) that receives (V_KEY).

Thus, when the key of the keypad 30 is pressed to the ground state, the interrupt signal input at the high level from the interrupt reference voltage output unit 46 to the interrupt port 12 of the MCU 10 falls to the low level. When the key of the keypad 30 is released from being pressed, the signal input at the low level from the interrupt reference voltage output unit 46 to the interrupt port 12 of the MCU 10 is restored to the high level.

Referring to the operation of the present invention in more detail as follows.

First, it is determined whether the keypad is enabled (ST11).

Thus, if the keypad is not enabled, the ADC is stopped and idle until the keypad is enabled (ST12).

When the user enables the keypad 30 to use a function such as an IM, the terminal switches to a mode for using the keypad and performs an ADC (ST13).

Thereafter, it is determined whether a value of a keypad is input for a predetermined time to determine whether to time out (ST14).

If there is no key input even after a certain time has elapsed, the ADC is stopped and the key input wait state is entered (ST15).

Then, it is determined whether the interrupt signal is a low level signal (ST16).

If the interrupt signal is a high level signal rather than a low level signal, the key input standby state is maintained.

Meanwhile, when the user presses a specific key among the plurality of keys Key_1 to Key_n in the keypad 30, an interrupt is generated to the MCU 10, and the ADC is started (ST17).

That is, when the key of the keypad 30 is pressed, it is connected to the ground, and the interrupt signal transferred from the interrupt reference voltage output unit 46 to the interrupt port 12 of the MCU 10 at the high level is converted to the low level. When the interrupt signal is changed to the low level in this way, the MCU 10 performs an ADC.

The reference resistor R_ref of the ADC reference voltage output section 45 and the interrupt reference voltage output section 46 and the resistors R1 to Rn of the keypad value output sections 41 to 44 assigned to the respective keys are divided into voltage dividers. In doing so, a specific voltage level is generated at the ADC Point point. The MCU 10 converting the A / D (analog-to-digital, analog-digital) is recognized as a key corresponding to the detected voltage level (ST18).

After processing the input key value in this way, it is determined whether the interrupt signal has changed to a high level (ST19).

If the interrupt signal is in the low level state rather than the high level, the keypad 30 determines that one key is pressed and maintains the standby state.

When the interrupt signal is restored to a high level, the key waits again for new key values to be entered.

Here, the interrupt signal is converted to the high level when the key of the keypad 30 is released from being pressed. That is, when the key of the keypad 30 is released, the connection to the round is cut off, and the high level signal of the interrupt reference voltage output unit 46 is interrupted to the interrupt port 12 by disconnecting from the ground. Occurs when it can be input.

Therefore, even if the ADC value changes before the signal level of the interrupt port 12 is restored to the high level, it is ignored. That is, when the user presses any key from the keys of the keypad 30 to another key, the other key value is ignored, thereby preventing a read error of the key input.

As such, the present invention minimizes ports and related resources used for key recognition in a portable terminal, and improves stability by improving accuracy of key recognition.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, an apparatus and method for improving key recognition accuracy in a terminal requiring a plurality of keys according to the present invention may be used for key recognition in a portable terminal requiring a plurality of keys for inputting letters and numbers, such as an IM phone. This minimizes the port and related resources used for the purpose of the system and improves the accuracy of key recognition, thereby increasing stability.

In addition, compared to the prior art, it is possible to recognize a large number of key inputs with fewer ports or resources, so that even if the number of keys to be applied to the terminal increases, a corresponding effect can be achieved without additional external IC or allocation of a large number of ports.

In addition, it is possible to reduce the current consumption since the ADC does not need to be continuously operated for key recognition, but only needs to be performed for a certain time after the interrupt is generated.

Furthermore, even if more than one key input occurs at the same time due to a user error, only the first recognized key value can be recognized and processed as normal, thereby improving the stability of the device.

Claims (5)

It has an ADC port for receiving the output of the ADC reference voltage output unit and an interrupt port for receiving the output of the interrupt reference voltage output unit, and determines whether to input the key according to the input value of the interrupt port, and then checks the ADC port input ADC value. MCU to perform key mapping; A keypad enable logic providing unit to provide keypad enable logic to the MCU; A keypad having a plurality of keys, one side of which is grounded, and the other side of which includes a key connected to a keypad value output unit of a key input voltage level generator ; The ADC has a reference voltage output unit and an interrupt reference voltage output unit, and when a key value is input from the keypad, a key input voltage level and a key input interrupt signal are generated and transmitted to the MCU through the ADC port and the interrupt port. And a key input voltage level generating unit for accurately recognizing a key value. The method of claim 1, wherein the key input voltage level generating unit, A keypad value output unit for outputting a keypad value to an ADC port in the MCU when a key of the keypad is pressed; An ADC reference voltage output unit connected between the keypad value output unit and the ADC port in the MCU to output an ADC reference voltage; A plurality of keys comprising an interrupt reference voltage output unit connected between the keypad and the keypad value output unit and connected to an interrupt port in the MCU to output an interrupt reference voltage for driving the keypad. Improved key recognition accuracy in the terminal. The keypad enable logic providing unit of claim 1, wherein the keypad enable logic unit comprises: When the keypad is enabled, it switches to the mode to use the keypad to perform the ADC, and if there is no key input after a certain period of time, it remains in the key input standby state. Improving key recognition accuracy in a terminal requiring a plurality of keys, characterized by providing a keypad enable logic to the MCU to perform a key input read error by maintaining a key input standby state after the interrupt value is changed. Device. A first step of performing an ADC by switching to a mode for using the keypad when the keypad is enabled; A second step of maintaining a key input standby state if there is no key input even after a predetermined time elapses after the first step; And a third step of checking the ADC value, performing key mapping, and returning to the second step after the second step to prevent a key input read error if there is a key input after the second step. A method for improving key recognition accuracy in a terminal requiring a plurality of keys. The method of claim 4, wherein the third step, Determining whether an interrupt value is low after the second step; Determining that there is no key input if the interrupt value is not low, and performing the second step; and performing an ADC by determining that there is a key input if the interrupt value is low; Checking the ADC value and performing key mapping after the ADC; Determining whether an interrupt value is high after performing the ADC value check and key mapping; If the interrupt value is not high, the keypad determines that one key is in a pressed state and maintains a standby state, and when the interrupt value is high, returning to the second step so that a new key value can be input. Method for improving the accuracy of key recognition in a terminal requiring a plurality of keys, characterized in that performed by.

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