KR940009747B1 - Cursor conversion circuit using mouse and method therefor - Google Patents

Abstract

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Description

Cursor conversion circuit using mouse and its method

1 is a cursor conversion circuit diagram using the mouse of the present invention.

2 is a view showing an example of a bitmap of a cursor pattern and a cursor pattern RAM to which a cursor pattern is to be copied according to a cursor conversion method using a mouse of the present invention.

3 is a flowchart of a mouse interrupt service process according to a cursor transformation method using a mouse of the present invention.

* Explanation of symbols for main parts of the drawings

10: mouse 20: interrupt controller

30: CPU 40: main memory

50: video system controller 60: video synthesis decoder

The present invention relates to a cursor conversion circuit using a mouse and a method for allowing a user to select a cursor pattern of various shapes in a compact disc interactive (CD-I) system.

The functions of the conventional mouse in the CD-I system consisted of the function of moving the cursor on the screen and the function of selecting a menu after placing the cursor at a specific position. The function is realized by using a two-button mouse. The pressed state is passed to the CPU as an interrupt with the specified standard information, and the mouse interrupt service routine processed the information.

That is, when the user presses the mouse button or moves the mouse, the mouse sends the button pressed state and the movement information to the interrupt controller in the form of 3 bytes, in which case the 3 bytes of information generate an interrupt for each byte. The interrupt signal is sent to a dedicated integrated circuit chip for control.

The interrupt controller notifies the CPU by sending an interrupt level. When the interrupt preparation signal comes from the CPU, the interrupt controller transmits the interrupt vector number through the data line, and the CPU uses the transmitted interrupt vector number to transmit the corresponding interrupt service routine. Was executed.

However, the function of such a conventional mouse is not only the shape of the cursor is generally determined unilaterally in its cursor function, the shape of the cursor is simple, the user cannot select various shapes, and the cursor shape is limited in the application. There is a function that can be changed, but there is a problem that can not always be serviced because it is possible only when provided by a specific application.

An object of the present invention is to allow a user to select a cursor pattern of various shapes at all times by using a mouse independently of an application program in a CD-I system, thereby allowing the user to access the CD-I system more interestingly. A cursor conversion circuit using a mouse and a method thereof are provided.

Hereinafter, the technical configuration of the present invention in detail.

The cursor conversion circuit using the mouse of the present invention, as shown in FIGS. 1 and 2, is connected to the CPU 30 to which the three-button mouse 10 is connected via the interrupt controller 20, and to the CPU 30. FIG. And a video system controller 50 which is connected to a data line 31 between the CPU 30 and the interrupt controller 20, and the output of the video system controller 50. The video composition decoder 60 is connected to output a video signal and has a cursor pattern RAM 61.

The cursor conversion method according to the cursor conversion circuit using the mouse of the present invention will be described in detail with reference to FIGS. 1 to 3 as follows.

First, the cursor conversion button is assigned to the mouse 10. In this case, one button is designated as the cursor conversion button using the three-button mouse 10, and the other two buttons are compatible with the existing two-button mouse. Configure to

In addition, various cursor patterns for the mouse 10 are stored in the main memory 40 in the form of a bit map 41, and the respective cursor patterns are assigned to the cursor pattern pointers to distinguish them.

Thereafter, when the mouse 10 input is transmitted to the interrupt controller 20 by an interrupt and a mouse interrupt occurs, the interrupt controller 20 notifies the CPU 30 of the interrupt occurrence through the IPL0 to IPL2 line 21, The interrupt vector number is transmitted to the prepared CPU 30 through the 16-bit data line 31. The CPU 30 performs the cursor conversion through the mouse interrupt service process with reference to the interrupt vector number.

In the mouse interrupt service process, when a new value is input from the mouse 10, the coordinate value is read and compared from the mouse state value to check whether there is a change in the coordinate values (X, Y) (S1).

If there is a change in the coordinate value, the input coordinate value is added to the stored coordinate value to obtain a new coordinate value, and then stored as a mouse state value (S2). In this case, X, Y coordinate values or button state values, which are mouse state values, are allocated by storing the input buffer of the main memory 40 as static storage.

If there is no change in the coordinate value, check the button change (S3), if there is no change, exit the mouse interrupt service process (S4), and if there is a button change, determine whether it is changed by the cursor change button (S5), If the conversion button is changed, the cursor conversion process (S6 to S8) is executed and ends.

If it is a change of the normal button instead of the cursor change button, the button state value is stored in the mouse state value as in the case of coordinate change (S2), and the process ends.

The cursor conversion process (S6 to S8) is performed when there is a change in the cursor conversion button. First, the video synthesis decoder 60 replaces the current cursor pattern in the cursor pattern RAM 61 with the main memory 40. In step S6, the cursor pattern indicated by the current cursor pattern pointer is copied from the main memory 40 to the cursor pattern RAM 61 of the video synthesis decoder 60 (S7). In this case, the cursor pattern copied to the cursor pattern RAM 61 of the video synthesis decoder 60 is synthesized with other images and output as a video output signal while the program is in progress, thereby appearing on the monitor.

Then, in order to change the cursor pattern sequentially as the cursor conversion button is continuously pressed, the cursor pattern pointer is moved to the position of the next cursor pattern (S8), and in this case, the cursor pattern pointer is moved to the array. Management is easy.

In other words, by managing the array, the cursor patterns are connected to each other in a continuous arrangement, and when the user repeatedly presses the cursor conversion button, the cursor pattern changes in turn, and finally returns to the initial cursor pattern. Cursor pattern can be selected.

As described above, the cursor conversion circuit and the method using the mouse of the present invention assign a cursor conversion button to the mouse, store the cursor patterns of various types in the main memory, and execute the cursor conversion through the mouse interrupt service process. By using the mouse independently of the application in the CD-I system, the user can always select a wider variety of cursor patterns, which makes the CD-I system more interesting for the user. will be.

Claims (4)

A mouse connected to a CPU connected via an interrupt controller, a main memory connected to the CPU and storing a cursor pattern, a video system controller connected to a data line between the CPU and the interrupt controller, and an output of the video system controller A cursor conversion circuit using a mouse, characterized by comprising a video synthesis decoder that outputs a video signal and has a cursor pattern RAM. The mouse designates a cursor conversion button and stores various types of cursor patterns in the main memory, assigns and distinguishes the cursor patterns as a cursor pattern pointer, and then, when a mouse interrupt occurs, the mouse interrupt service process Cursor conversion method using a mouse, characterized in that the step of performing a conversion. The method of claim 2, wherein the mouse interrupt service process comprises: determining whether the input from the mouse is a coordinate change or a button change through a mouse state value; If the conversion button is changed, the cursor conversion process is executed and terminated. If the button is not a cursor conversion button or a coordinate change, the value is stored and terminated as a mouse state value. How to convert cursor. 4. The method of claim 3, wherein the cursor conversion process includes evacuating the current cursor pattern in the cursor pattern RAM of the video synthesis decoder to the main memory, and moving the cursor pattern indicated by the current cursor pattern point from the main memory to the cursor of the video synthesis decoder. Copying to a pattern RAM and displaying on the screen; and moving the cursor pattern pointer to the position of the next cursor pattern so that the cursor pattern is sequentially converted as the cursor conversion button is continuously pressed. How to change cursor using mouse.