KR100494310B1 - How to detect the eject button on the tray - Google Patents

Abstract

The present invention is to detect the eject button of the tray to enable the eject button to connect to the general port as well as the interrupt port to use the interrupt port for other purposes, the present invention initializes the tray and then repeatedly eject the button for a predetermined time Calls a chattering routine that retrieves whether the button has been pressed correctly to determine if the eject button has been pressed.If the eject button is pressed, it calls an open routine that ejects the tray when the tray is fully closed. When the eject button is pressed during the tray open operation or the tray close operation, it returns from the current routine and the reverse operation is stored in the tray state variable to open or close the conversion operation many times. Even if Locking allows you to use the interrupt ports, interrupt vectors, and timers for other purposes, freeing up system design, using the system efficiently without upgrading, and completely converting interrupt routine processing to generic routines with flags. Other interrupt handling routines can be replaced with regular routines.

Description

How to detect eject button on tray

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optical media devices such as compact disc (CD) -players or video CD players (autochangers) or DVD (digital video disks) -players using trays, in particular trays ( The present invention relates to a method of detecting an eject button of a tray so that the eject button can be connected to a general port as well as an interrupt port so that the interrupt port can be used for other purposes.

Generally, a DVD player or a CD player is a device capable of playing a disc on which sound and video signals are recorded.

DVD-players or CD-players using such a common tray, as shown in FIG. 1, receives the signals of the open limit button 50 and the close limit button 60 to open / close the tray 40. A microcomputer 10 for controlling an operation; A drive unit 20 for outputting a tray driving control signal whose strength and weakness are adjusted by voltage differences according to the control of the microcomputer 10; A tray driving motor 40 for driving the tray 40 according to the control signal of the drive unit 20; A tray 40 opened or closed according to the drive of the tray driving motor 40; An open limit button 50 which operates when the opening operation of the tray 40 is completed and informs the microcomputer 10 that the tray 40 is open; When the closing operation of the tray 40 is completed, the operation is configured as a close limit button 60 to notify the microcomputer 10 that the tray 40 has been closed.

The conventional tray driving apparatus configured as described above outputs a signal for controlling only whether the tray 4 is driven or left in the microcomputer 1 and, if so, a signal for controlling only whether the tray 4 is open or closed. (2) was operated. Therefore, the drive unit 2 is different only in the direction and always comes out a constant output.

2 is a flowchart showing an interrupt routine when the conventional eject button 1 is operated.

As shown in the figure, when the eject button 1 is pressed, another interrupt is prohibited, and after the chattering, the eject button 1 is checked again to check whether the eject button 1 is correctly pressed (ST1). ST3); If the eject button (1) is not pressed correctly, accepting another interrupt, and ending and returning an interrupt routine (ST4) (ST5); Turning on a timer (ST6) when the eject button (1) is pressed correctly; After the timer is turned on, if the state is closed according to the current tray 5 state, the motor 4 is turned on to open the tray 5, and if the timer is opened or stopped, the motor 4 is turned on to turn the tray 5 on. ), The tray 5 is opened by reversing the rotation of the motor 4 in the closing state, and the tray 5 is closed by reversing the rotation of the motor 4 in the opening state. The procedure consists of setting the flag and allowing another interrupt, then ending and returning the interrupt routine (ST7-ST10).

3 is a flowchart showing an interrupt routine when the conventional open limit button 7 or the close limit button 6 is operated.

As shown therein, a step of setting a flag by checking which port of the close limit button 6 connection port and the open limit button 7 connection port is in an on state (ST11); When the close limit button 6 connection port and the open limit button 7 connection port are both on or not on, ending and returning an interrupt routine (ST12); Turning off the timer if any one of the close limit button (6) connection port and the open limit button (7) connection port is turned on, and then inspecting the closed state of the tray (ST13) (ST14); If the tray 5 is in a closed state, ending and returning an interrupt routine after the tray 5 chucking (ST15); Determining whether the tray 5 is switched to the closed state by pushing the tray 5 by hand or pressing a tray button when the tray 5 is not in a closed state (ST16); When the tray 5 is switched to the closed state, the tray is closed, the flag is set to the tray closing state, and the interrupt routine is finished and returned (ST17 to ST19).

4 is a flowchart showing an interrupt routine after a conventional timer is started.

As shown here, the steps of turning off the timer to increment the interrupt counter and determining whether the interrupt count is 3 seconds or more (ST21-ST23) and: if the interrupt count is 3 seconds or more, turn off the motor 4 and the tray ( 5) ending the interrupt routine and returning after setting the flag in the stop state (ST24-ST26); If the interrupt count is not more than 3 seconds, the tray 5 is closed by reversing the rotation of the motor 4 in the opening state according to the current tray 5 state, and the tray 5 is reversed by reversing the rotation of the motor 4 in the closing state. Opening, and if it is open or closed, it consists of calling error return, turning on the timer, ending the interrupt routine, and then returning (ST27-ST29).

The operation of the interrupt method by the eject button of the conventional tray configured as described above will be described in detail with reference to the accompanying drawings.

First, the interrupt routine when the eject button 1 of FIG. 2 operates is called and executed every time the eject button 1 is pressed. This prevents the interrupt routine from being called again during the processing of the interrupt routine (ST1). And since the interrupt routine itself is not a routine that requires a long time, prohibit other interrupts and check the eject button 1 connection port again after chattering to see whether the eject button 1 is correctly pressed ( ST2) (ST3). In this way, the eject button 1 connection port is checked once again, and if the eject button 1 is not pressed correctly, another interrupt is allowed and the interrupt routine ends and returns (ST4) (ST5).

In addition, the eject button 1 is connected to the port once again, and when the eject button 1 is correctly pressed, the timer is turned on (ST6). Thus, if the timer is turned on and the tray 5 is closed according to the current tray 5 state, the motor 4 is turned on to open the tray 5, and the tray 5 is opened or stopped. The tray 4 is closed by turning the motor 4 on, and when the tray 5 is closed, the rotation of the motor 4 is reversed to open the tray 5, and when the tray 5 is opened, the motor 4 is closed. Reverse the rotation of the tray 5 to close (ST7). After setting the flag according to each state and allowing other interrupts, the interrupt routine ends and returns (ST8-ST10).

On the other hand, the interrupt routine of Fig. 3 is a routine that is called and executed when the open limit button 7 or the close limit button 6 is operated (i.e., the opening or closing operation is completed).

Therefore, it is checked whether the port of the close limit button (6) connection port or the open limit button (7) connection port is turned on. If the close limit button (6) is turned on, the flag is set to the tray (5) closed state. If the open limit button 7 is turned on, the flag is set to the open state of the tray 5 (ST11). If the close limit button 6 connection port and the open limit button 7 connection port are both on or not on, the interrupt routine ends and returns (ST12).

If any one of the close limit button 6 connection port and the open limit button 7 connection port is turned on, the operation of the tray 5 is completed. Thus, the timer is turned off and the close state of the tray 5 is examined ( ST13) (ST14). Thus, if the tray 5 is closed and the closing is completed, the tray 5 is chucked with a slight delay, and the interrupt routine ends and returns (ST15).

In this case, if the tray 5 is not closed, it is in the open state. If the tray 5 is in the standby state and the tray 5 is pushed by hand, the closing operation of the tray is started, the flag setting and the interrupt routine are finished and returned. Since it is called as an interrupt routine, when it returns, the routine ends and returns (ST16-ST19).

Meanwhile, the interrupt routine of FIG. 4 is a routine that is called and executed when the tray is not opened or closed in 3 seconds after the timer is started and finally reaches 3 seconds after the timer is started.

Therefore, since the time limit has already elapsed, the timer is turned off to be cleared and the interrupt counter is incremented by one (ST21) (ST22). If the interrupt count is 3 seconds or more (ST23), and if the interrupt count is 3 seconds or more (that is, if the tray 5 has not been opened or closed in 3 seconds and has been retried more than 3 times), (4) is turned off, the tray 5 is stopped, and the interrupt routine ends and returns (ST24 to ST26).

In addition, if the interrupt count is not more than three seconds and the number of retries has not yet been three, the operation opposite to the operation of the tray 5 so far is started. In other words, if the tray 5 is opened according to the current tray 5 state, the rotation of the motor 4 is reversed to close the tray. If the tray 5 is closed, the rotation of the motor 4 is reversed to reverse the tray 5. ), The tray 5 is opened or closed, and an error return is called. Then, the timer is started again and the interrupt routine ends and returns (ST27 to ST29).

However, the conventional method used at least two interrupt ports and three interrupt vectors and a timer only to operate the tray correctly. Therefore, by using interrupt ports, interrupt vectors, and timers, which may be insufficient in system configuration, it becomes difficult to process when interrupt ports, interrupt vectors, and timers are needed for other purposes, and sometimes the problem of having to upgrade micom to a higher version is needed. Occurred.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to detect the eject button of the tray to enable the eject button to be connected not only to the interrupt port but also to a general port. The present invention provides a method of detecting an eject button of a tray that can be used as a tray.

Eject button detection method of the tray according to the present invention to achieve the above object,

If the tray is open, closing and initializing the tray, and repeatedly calling the chattering routine for retrieving whether the eject button has been pressed correctly for a predetermined time to determine whether the eject button has been pressed; Calling an open routine to eject the tray when the tray is completely closed when the eject button is pressed, and calling a close routine to load the tray when the tray is open; If the eject button is pressed during the open operation by calling the tray open routine or by the close routine, it is returned from the current routine and the reverse operation is stored in the tray state variable to open or close the conversion operation many times. It is characterized by the technical configuration that consists of the steps to be performed.

Hereinafter, an embodiment according to the technical concept of the eject button detection method of the present invention tray configured as described above is as follows.

The configuration and operation of the apparatus using the tray to which the present invention is applied are the same as described above as shown in FIG.

5 is a flowchart showing an eject button detection method of the tray 5 according to the present invention.

As shown in the figure, if the tray 5 is opened, the close routine is called by closing the tray 5, and then initialized. Then, the eject button is pressed correctly. If the eject button is not pressed correctly, the chattering routine is delayed after 5 ms. Calling to remove chattering (ST31-ST34) (ST44) (ST45); When the eject button is pressed correctly, the tray 5 is searched to see if it is completely closed. If the eject button is closed, an open routine for ejecting the tray 5 is called. When the tray 5 is open, the tray 5 is opened. Calling the closing routine to be loaded (ST35-ST37); When the eject button is pressed during the open operation by calling the tray open routine or by the close routine, the chattering routine is called to remove the chattering, and when the eject button is not operated, the eject button is pressed again. Initializing a variable to detect this, and performing the conversion operation of the open and closed (ST38-ST43).

In the above chattering routine, as shown in Fig. 6, a step of determining whether the eject button 1 is pressed (ST51); If the eject button (1) has been pressed, determining whether the eject button (1) is kept pressed or released and pressed again (ST52); Removing the chattering if the eject button 1 is released and then pressed again, and determining whether the eject button 1 is correctly pressed (ST53) (ST54); If the eject button 1 is correctly pressed, even if the eject button 1 is kept pressed, the eject button 1 is set to proceed by ignoring the eject button 1 being pressed from the next time it is called and then returning (ST55). (ST56); If the eject button 1 is not pressed or the eject button 1 is continuously pressed or the eject button 1 is not pressed correctly, the method comprises initializing and returning chattering (ST57) (ST58).

In the above-described open routine, as shown in Fig. 7, steps of initializing the counter and chattering and then determining whether the counter is equal to or less than a predetermined value (ST61) (ST62); Calling an open error routine if the counter is not below a predetermined value (ST63); Determining whether the open limit switch (7) is pressed if the counter is less than or equal to a predetermined value (ST64); Stopping the motor (4) when the open limit switch (7) is pressed to call a close wait routine (ST65) (ST66); Determining whether chattering is an initial value if the open limit switch 7 is not pressed (ST67); If the chattering is not an initial value, executing a close and returning (ST68); Outputting the control value of the ejecting operation by outputting to the drive unit 3 when the chattering is an initial value, and then calling a chattering routine every time the counter increases a predetermined number of times, and increasing the counter after a certain delay ( ST69-ST72).

The close wait routine may include: initializing a chattering value (ST81), as shown in FIG. Initiating the chattering value and invoking the chattering routine after a predetermined time delay if the open limit switch 7 is not lifted and the chattering is an initial value (ST82-ST85); If the open limit switch 7 is lifted or the chattering value is not an initial value, a step of executing and returning closes (ST86).

In the above-described closing routine, as shown in Fig. 9, steps of initializing the counter and chattering and then determining whether the counter is equal to or less than a predetermined value (ST91) (ST92); Invoking a close error routine if the counter is not below a predetermined value (ST93); Determining whether the close limit switch (6) is pressed when the counter is equal to or less than a predetermined value (ST94); Calling the tray chucking routine if the close limit switch 6 is pressed and then stopping and returning the motor 4 (ST95) (ST96); Determining whether chattering is an initial value if the close limit switch (6) is not pressed (ST97); If the chattering is not an initial value, executing open and returning (ST98); Outputting a control value of a loading operation by outputting to the drive unit 3 if the chattering is an initial value, and then calling a chattering routine every time the counter increases a predetermined number of times, and increasing the counter after a predetermined time delay ( ST99-ST102).

In the above tray chucking routine, as shown in Fig. 10, steps of initializing the counter and chattering and then determining whether the counter is equal to or less than a predetermined value (ST111) (ST112); Determining whether chattering is an initial value when the counter is less than or equal to a predetermined value (ST113); Calling the chattering routine whenever the counter increases a predetermined number of times if the chattering is an initial value, and incrementing the counter after a predetermined time delay (ST114 to ST116); Returning if the counter is less than or equal to a predetermined value (ST117); If the chattering is not the initial value, it is performed by executing open and returning (ST118).

The operation of the eject button detection method of the tray according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the detection algorithm of the eject button 1 of the tray 5 uses a main routine and a flag variable repeated below a reference time to process this as a general routine instead of an interrupt routine. It determines whether the button is pressed to perform a load / eject operation even during chattering, so that the eject button 1 of the tray 5 can be correctly detected without using an interrupt port. By using this, various interrupt routines can be converted into regular routines, which improves the development environment and solves the problem of shortage of interrupt ports without upgrading the central processing unit (CPU).

So the main routine is a representation of a part of the main routine, other processing routines can be added, and of course there can be other routines between the main routine and the chattering routine.

First, if the tray 5 is a little open by the initialization process, the tray 5 is searched to close it, and if the tray 5 is open at first, a close routine is called to close the tray (ST31) ( ST32). Then, the chat button, which is the flag of the eject button 1 detection result, is cleared (chat = 0) (ST33). Here the chat is chat = 1 when the eject button 1 is pressed correctly for the purpose of operation.

Subsequent loops can be repeated every certain amount of time (eg 5ms). (In most firmwares these days, the interrupt routines increase and the mainroutines are very short. By using this method, the eject button 1 can be detected more accurately. When using the interrupt port and routine to detect the eject button, consider the following waveform input.

Here, if the above signal comes in several times in a very short time, the interrupt is triggered wherever there is a ↑ mark, so it is not often pressed properly for operation.However, if you use the method of checking once per period This problem can be solved.

Therefore, if the eject button 1 is continuously detected and pressed (when the initial operation is started when the motor is stopped), the tray 5 is opened when the tray 5 is completely closed. If it is, close it. Then, it is determined whether the tray 5 is completely closed (ST35), and the closing routine is called if the tray 5 is not completely closed (ST36), and the open routine is called if the tray 5 is completely closed ( ST37).

In this way, it is searched whether the tray 5 is completely closed, and then it is determined whether the tray 5 state is closed (ST38), and if the tray 5 state is not closed, the tray 5 is opened (ST39). ). Thus, if the tray 5 is not open, the eject button 1 is pressed again, the tray 5 state variable is initialized to detect the state (ST40) (ST41), and the tray 5 is initialized. Is in the open state, the initialization routine of the tray 5 state variable is called (ST42) (ST43). When the tray 5 is completely closed or the tray 5 state is closed, the chattering routine is called after a delay (ST44) (ST45). That is, if the eject button is pressed again during the open or close operation instead of starting the first operation with the motor 4 defined, it is returned from the current routine, and the opposite operation is stored in the tray state variable several times. Even open and close can be converted. This allows one routine to have the same effect in a regular routine as if it had an interrupt and handled another interrupt during processing. When the tray 5 status variable has a non-zero value, it is reinitialized just before it is executed by the routine so that the eject button 1 can be detected several times.

On the other hand, the chattering routine shown in FIG. 6 determines whether the eject button 1 has been correctly pressed for operation (whether it is kept pressed or not again in the pressed state again) and removes the chattering if it is pressed. Routines that allow for correct detection.

Thus, when the eject button 1 is pressed (released) once, it makes the eject button 1 detection result flag 1, and the no_double flag is also 1 if the user presses the eject button. If you kept holding down (1), instead of detecting that the eject button (1) was pressed when entering the next chattering routine, you see that the user pressed the eject button (1) by noting that the no_double flag was still set to 1. In this case, the eject button 1 detection result flag is set to 0 indicating that no flag is detected. This allows you to use one flag to ensure that interrupts that occur only on the Up Edge or Down Edge in the interrupt routine (thereby no interruption when the signal continues high or low) have the same effect in the normal routine, not the interrupt routine. It was. After that, the chattering was removed and again the eject button 1 was detected to make the detection more accurate.

Accordingly, it is determined whether the eject button 1 has been pressed (ST51), and if the eject button 1 is kept being pressed or released again and then is pressed (ST52), the eject button 1 is released and pressed again. After the time delay, the chattering is removed and it is determined whether the eject button 1 is correctly pressed (ST53) (ST54). If the eject button 1 is correctly pressed, even if the eject button 1 is kept pressed, the eject button 1 is set to proceed after ignoring the eject button 1 being pressed from the next time it is called (ST55) ( ST56). In addition, if the eject button 1 is not pressed or the eject button 1 is continuously pressed or the eject button 1 is not correctly pressed, the chattering is initialized and returned (ST57) (ST58).

On the other hand, the open routine shown in Fig. 7 is a routine that actually performs the operation of ejecting the tray 5.

So, 1ms unit timer counter and eject button (1) detection result flag chat is initialized to 0 (ST61), and the tray open limit button (7) or eject button (1) is pressed for 2.5 seconds simultaneously, (5) Ejecting operation. The call to the chattering routine is called every unit time (for example, 5 ms) using a counter that is a 1 ms unit timer variable to determine whether the eject button 1 is detected. If the eject button 1 is pressed again, the return value is 2 in the variable tray_state indicating that the next operation is closed. If the tray open limit button 7 is pressed, the motor 4 is stopped when the opening is completed. The output control value is output to the drive unit 3 and called by the close wait routine. (If the tray is open, there will be no next action other than inserting the disk, so stop all operations and enter the close standby state.) If the opening is not completed for 2.5 seconds, there is an obstacle and the tray is ejecting. There are many reasons, such as when it stops. In this case, you can close and open several times, but if any operation is completed, it returns to the main routine again. 4) Stop and return to the main routine (housekeeping routine) (ST61-ST72)

In addition, the close wait routine shown in FIG. 8 is a routine that is called when the open is completed, and is a routine that waits until it is closed.

Therefore, if the tray open limit button 7 is lifted up (if the tray is lifted by hand) or the eject button 1 is pressed again, then if it happens, close the tray 5 and return. (ST81-ST85).

And the close routine shown in Fig. 9 is a routine which actually loads the tray 5.

This close routine does the opposite of the open routine, and if the close is not completed for 2.5 seconds, the actions attempted by the housekeeping routine are reversed in order, and the tray chucking routine when the close limit button (6) is pressed. The operation is the same as that of the open routine except that the motor 4 is stopped and returned after returning to (ST91-ST102).

In addition, the tray chucking routine shown in FIG. 10 is a routine that is called when the closing is completed, and is a routine that waits about 0.3 seconds after the close limit switch is pressed to allow the tray to be chucked, and when the eject button 1 is pressed even during chucking. The open operation is executed (ST111-ST116).

As described above, the present invention detects an eject button of a tray so that the eject button can be connected to a general port as well as an interrupt port so that the interrupt port can be used for other purposes.

As described above, the eject button detection method of the tray according to the present invention implements a tray operation correctly without using system resources such as an interrupt port, an interrupt port, and a timer. With the availability of vectors and timers for other purposes, you have more time to design your system, and you can efficiently manage your system without the need to upgrade your microcomputer due to lack of system resources such as interrupt ports and interrupt vectors and timers. There is an effect that can be used.

In addition, the present invention also has the effect that other interrupt processing routines can be replaced with the general routine by completely converting the processing of the interrupt routine called at the up edge and the down edge into the normal routine using the flag.

1 is a block diagram of a device using a general tray,

2 is a flowchart showing an interrupt routine when a conventional eject button is operated.

3 is a flowchart showing an interrupt routine when a conventional open limit button or a close limit button is operated;

4 is a flowchart showing an interrupt routine after a conventional timer is started.

5 is a flowchart illustrating an eject button detection method of a tray according to the present invention;

6 is a flowchart illustrating a chattering routine in FIG. 5;

7 is a flowchart illustrating an open routine in FIG. 5;

8 is a flowchart illustrating a close wait routine of FIG. 7;

9 is a flowchart showing a close routine in FIG. 5;

10 is a flowchart illustrating a tray chucking routine in FIG. 9.

<Description of the code | symbol about the principal part of drawing>

1: eject button 2: microcomputer

3: drive section 4: tray drive motor

5: tray 6: close limit button

7: open limit button

Claims (4)

If the tray is open, closing and initializing the tray, and repeatedly calling the chattering routine for retrieving whether the eject button has been pressed correctly for a predetermined time and removing the chattering; Calling an open routine to eject the tray when the tray is completely closed when the eject button is pressed, and calling a close routine to load the tray when the tray is open; If the eject button is pressed during the open operation or the close routine by calling the tray open routine, the chattering is removed and stored in a tray state variable so that the open and close conversion operation can be performed any number of times. In the eject button detection method of the made tray, The chattering routine is Determining whether the eject button has been pressed; If the eject button is pressed, determining whether to continue pressing or releasing the eject button; Removing the chattering if the eject button is released and then pressed again, and determining whether the eject button is correctly pressed; If it is correct to press the eject button correctly, even if the eject button is kept pressed, the setting is made to proceed after ignoring the eject button being pressed from the next time it is called and proceeding; If the eject button is not pressed or if the eject button is continuously pressed or the eject button is not pressed correctly, the step of initializing chattering and returning is performed. The open routine, Initiating a counter and chattering and then determining whether the counter is below a predetermined value; Calling an open error routine if the counter is not below a predetermined value; Determining whether the open limit switch is pressed when the counter is less than or equal to a predetermined value; Stopping the motor to invoke the close wait routine if the open limit switch is pressed; Determining if chattering is an initial value if the open limit switch is not pressed; If the chattering is not an initial value, executing a close and returning it; If the chattering is the initial value, it outputs to the drive unit to output the control value of the ejecting operation, and then every time the counter is increased by a certain number of times, the chattering routine is called, and the counter is increased after a certain delay. Eject button detection method for a tray. The method of claim 1, wherein the close wait routine comprises: Initializing a chattering value; Initiating the chattering value and invoking the chattering routine after a predetermined time delay if the open limit switch is not lifted and the chattering is an initial value; And closing and executing the return if the open limit switch is lifted or the chattering value is not the initial value. The method of claim 1, wherein the close routine, Initiating a counter and chattering and then determining whether the counter is below a predetermined value; Calling a close error routine if the counter is not below a predetermined value; Determining whether the close limit switch is pressed when the counter is less than or equal to a predetermined value; Calling the tray chucking routine if the close limit switch is pressed and stopping and returning the motor; Determining whether chattering is an initial value if the close limit switch is not pressed; If the chattering is not an initial value, executing open and returning; Outputting a control value of a loading operation when the chattering is an initial value, and then calling a chattering routine every time the counter increases a predetermined number of times, and increasing the counter after a predetermined time delay. Eject button detection method for a tray. The method of claim 3, wherein the tray chucking routine, Initiating a counter and chattering and then determining whether the counter is below a predetermined value; Determining if chattering is an initial value if the counter is less than or equal to a predetermined value; Invoking a chattering routine each time the counter increases a predetermined number of times if the chattering is an initial value, and incrementing the counter after a predetermined time delay; Returning if the counter is not below a predetermined value; And if the chattering is not an initial value, executing the open and returning the chatter.