JP2002073428A - Bus line control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that when a fault occurs in a CD player, its CD mechanical mechanism can not be controlled from a control unit through a bus. SOLUTION: A CD player system 100 comprises the following: the CD player 20 having a first bus receiver that receives a bus control signal through the bus 40 and a first microcomputer 23 that controls the CD mechanical mechanism 21 based on the bus control signal; and the control unit 30 having a second microcomputer 33 that generates a control signal based on operational instruction and a second bus receiver 34 that generates the bus control signal based on the control signal. The second microcomputer has a fault detection means 33A for detecting a fault in the CD player and a control means 33B that directly controls the CD mechanical mechanism not through the first microcomputer but through the first bus receiver 22 when a fault is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bus line control device for controlling a hardware unit from an external unit via a bus.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a schematic configuration inside a CD player system related to a conventional bus line control device.

A conventional CD player system 5 shown in FIG.
Reference numeral 0 denotes a hardware unit, such as a CD player 60 provided with a CD mechanism mechanism 61 for reproducing a CD disk and generating an audio signal, and a control unit 70 as an external unit for controlling the CD player 60. And a bus 80 for communicatively connecting the CD player 60 and the control unit 70.

[0004] The CD player 60 has a CD mechanical mechanism 61.
A first bus receiver 62 for receiving a bus control signal from the bus 80; and a first microcomputer 63 for controlling the CD mechanism mechanism 61 based on the bus control signal received by the first bus receiver 62. are doing.

A control unit 70 includes an operation unit 71 for instructing the operation of the CD player 60 and a CD player 6
And a second microcomputer 7 for generating a control signal based on an operation instruction (operation).
And a second bus receiver 74 for generating a bus control signal based on the control signal generated by the second microcomputer 73
And

A control signal is transmitted between the first bus receiver 62 and the first microcomputer 63 in the CD player 60 using a communication protocol dedicated to the bus receiver.
3 and the CD mechanism 61 are transmitted using a protocol different from the communication protocol dedicated to the bus receiver.

[0007] The second microcomputer 73 of the control unit 70 generates a control signal based on an operation instruction (operation) from the operation unit 71, and transmits the control signal to the second bus receiver 7.
4 The second bus receiver 74 generates a bus control signal based on the control signal, and outputs the bus control signal
The data is transmitted to the CD player 60 via the bus 80.

[0008] The first microcomputer 63 of the CD player 60
When the bus control signal is received by the first bus receiver 62, the CD mechanism mechanism 61 is controlled based on the bus control signal.

As described above, the conventional CD player system 5
According to 0, the control unit 70 indirectly controls the CD mechanical mechanism 61 in the CD player 60.

[0010]

However, according to the above-mentioned conventional bus line control device, the control unit (external unit) 70 has a CD mechanism (hardware unit) through the first microcomputer 63 in the CD player (hardware unit) 60. Ware) 61 is indirectly controlled. For example, the first microcomputer 63 in the CD player 60,
If any trouble occurs between the first microcomputer 63 and the first bus receiver 62 or between the first microcomputer 63 and the CD mechanism 61, the control unit 70 cannot control the CD mechanism 61 via the bus 80. There was a point.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a bus line which can control hardware from an external unit even if a failure occurs in a hardware unit. It is to provide a control device.

[0012]

In order to achieve the above object, a bus line control device according to the present invention comprises a first bus receiver for receiving a bus control signal from a bus, and a bus received by the first bus receiver. A hardware unit including a first microcomputer for controlling hardware based on a control signal for use, a second microcomputer for generating a control signal based on an operation instruction, and a control unit based on a control signal generated by the second microcomputer. A bus line control device having an external unit having a second bus receiver for generating the bus control signal, wherein the second microcomputer is provided between the hardware and the first microcomputer, and between the first microcomputer and the first microcomputer. A fault detecting means for detecting a fault between bus receivers or in the first microcomputer; and a fault detecting means for detecting the fault in the first microcomputer. Succoth without via the first bus receiver, and to a control means for controlling the hardware directly.

Therefore, according to the bus line control device of the present invention, when a failure is detected between the first microcomputer in the hardware unit, the hardware and the first microcomputer, or between the first microcomputer and the first bus receiver, The external unit directly controls the hardware via the first bus receiver without the intervention of the first microcomputer. Even if a failure occurs in the hardware unit, the external unit controls the hardware via the bus. can do.

That is, since the external unit directly controls the hardware through the first bus receiver in the hardware unit, it is possible to compensate for the minimum required operation and to enable the operation of the hardware alone to be restored by the SW or the like. Need not be provided, and it is not necessary to install the device in a place where the operation can be easily performed.

According to a second aspect of the present invention, in the bus line control device, the hardware is an audio signal source for generating an audio signal, and the external unit is connected to the audio signal source through the first microcomputer. Control unit to control the

Therefore, according to the bus line control device of the present invention, between the first microcomputer, the acoustic signal source and the first microcomputer in the acoustic unit, or between the first microcomputer and the first bus receiver. When a failure is detected, the control unit directly controls the sound signal source through the first bus receiver without passing through the first microcomputer. Therefore, even if a failure occurs in the sound unit, the control unit can control the sound signal source through the bus. Can control the acoustic signal source.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A CD player system showing an embodiment relating to a bus line control device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration inside the CD player system shown in the present embodiment.

The CD player system 10 shown in FIG.
A CD player 20 which is a hardware unit provided with hardware, for example, a CD mechanism mechanism 21 for reproducing a CD disk and generating an audio signal;
A control unit 30, which is an external unit for controlling the control unit 0, and a bus 40 for communicatively connecting the CD player 20 and the control unit 30.

The CD player 20 includes a CD mechanism 21
A first bus receiver 22 for receiving a bus control signal from the bus 40; and a first microcomputer 23 for controlling the CD mechanism 21 based on the bus control signal received by the first bus receiver 22. are doing.

The control unit 30 includes an operation unit 31 for instructing the operation of the CD player 20 and a CD player 2
A display 32 for displaying information relating to the screen on a screen, a second microcomputer 33 for generating a control signal based on an operation instruction, and a bus control signal based on the control signal generated by the second microcomputer 33. And a second bus receiver 34.

The second microcomputer 33 of the control unit 30 is provided between the CD mechanism 21 and the first microcomputer 23, between the first microcomputer 23 and the first bus receiver 22, or
When a failure in the microcomputer 23, that is, a failure detection unit 33A that detects a failure in which the control unit 30 cannot indirectly control the CD mechanical mechanism 21 and a failure detection unit 33A detects a failure, And a control means 33B for directly controlling the CD mechanical mechanism 21 through the first bus receiver 22 without going through one microcomputer 23.

Normally, when the first microcomputer 23 in the CD player 20 receives the bus control signal from the bus 40 through the first bus receiver 22, it controls the CD mechanism 21 based on the bus control signal. Things.

On the other hand, the control unit 30
When the failure detection means 33A detects a failure in the CD player 20, the second microcomputer 33 transmits the bus 4 via the first bus receiver 22 without passing through the first microcomputer 23.
The CD mechanism mechanism 21 is directly controlled based on the bus control signal received from 0. Although the first bus receiver 22 directly controls the CD mechanism 21, here, the control unit 30 sends the CD player 20.
Minimum control action required if the control can no longer be controlled,
For example, there is an eject operation for ejecting the disc in the CD player 20.

Next, the operation of the CD player system 10 shown in this embodiment will be described. FIG. 2 is a flowchart showing the processing operation of the second microcomputer 33 relating to the failure avoidance processing in the control unit 30 in the present embodiment.

This obstacle avoidance process is a process of ejecting the disc in the CD player 20 which is the minimum necessary control operation when the control unit 30 cannot control the CD mechanical mechanism 21 in the CD player 20. It is.

When the second microcomputer 33 in the control unit 30 receives an operation instruction in response to an operation from the operation unit 31, as shown in FIG. 2, it generates a control signal based on the operation instruction, and generates a control signal. Signal to the second bus receiver 3
4

The second bus receiver 34 includes a second microcomputer 3
Generating a bus control signal based on the control signal from
The bus control signal is transmitted to the CD player 20 via the bus 40 (step S11).

The first microcomputer 23 in the CD player 20
Receives the bus control signal through the first bus receiver 22 and controls the CD mechanism 21 based on the bus control signal. At this time, when the first microcomputer 23 controls the CD mechanical mechanism 21 according to the bus control signal, the first microcomputer 23 transmits a command response signal corresponding to the bus control signal to the control unit 30 side through the bus 40. 2 Transmit to microcomputer 33.

Therefore, the second microcomputer 33 of the control unit 30 determines whether or not a command response signal from the CD player 20 has been received within a predetermined time through the failure detecting means 33A (step S12).

When the second microcomputer 33 on the control unit 30 side does not receive the command response signal within the predetermined time, the second microcomputer 33 in the first microcomputer 23 in the CD player 20
It is determined that a failure has occurred between the first microcomputer 23 and the first bus receiver 22 or between the first microcomputer 23 and the CD mechanism 21.

The second microcomputer 33 includes a failure detecting means 33A.
When a failure has occurred in the CD player 20 through the control unit 33B, a bus control signal relating to an eject operation for ejecting a disc to the CD mechanism mechanism 21 is transmitted to the first bus receiver 2 in the CD player 20 through the control means 33B.
2 (step S13).

First bus receiver 22 of CD player 20
When the bus control signal is received through the control means 33B of the second microcomputer 33, the CD mechanism mechanism 21 is directly controlled based on the bus control signal without passing through the first microcomputer 23, and thereby the CD mechanism is controlled. The disc is ejected from the mechanism 21.

Further, the second microcomputer 33 of the control unit 30 displays an eject display relating to the eject operation on the screen of the display 32 (step S14), and terminates this processing operation.

If the second microcomputer 33 on the control unit 30 side can receive the command response signal within a predetermined time in step S12, the second microcomputer 33 operates the CD player 20 based on the command response signal. The state is grasped (step S15), and this operation state is displayed on the display 32 on the screen (step S16), and this processing operation is completed.

According to the present embodiment, the CD player 20
When a failure is detected between the first microcomputer 23, the CD mechanism mechanism 21 and the first microcomputer 23, or between the first microcomputer 23 and the first bus receiver 22, the first bus receiver 22, the second microcomputer 33 of the control unit 30
Is directly controlled, so that even if a failure occurs in the CD player 20, the CD mechanism mechanism 21 can be controlled from the control unit 30 through the bus 40.

That is, if the control unit 30
Since the CD mechanism mechanism 21 is directly controlled through the first bus receiver 22 in the player 20, the minimum required operation can be compensated, and there is no need to provide a SW or the like that enables the CD player 20 to return to the operation alone. In addition, it is not necessary to install the device in a place where the operation can be easily performed.

In the above embodiment, it is determined in step S12 shown in FIG. 2 whether a command response signal has been received within a predetermined time or not. Although it is determined that a failure has occurred in the CD player 20, for example, the first microcomputer 23
Receives the bus control signal from the first bus receiver 22, but cannot control the CD mechanism 21 based on the bus control signal, the first microcomputer 23 sends a command execution disable signal from the first microcomputer 23. The data may be transmitted to the control unit 30, and when the command execution disable signal is received by the second microcomputer 33 of the control unit 30, it may be determined that a failure has occurred in the CD player 20.

In the above-described embodiment, if a failure occurs in the CD player 20, the control unit 30 sends the CD player 2
Although the eject operation for ejecting the disc is performed for the CD mechanism mechanism 21 of the “0”, other operations may be performed.

In the above embodiment, the CD player 20 has been described as an example of a hardware unit. However, not only audio equipment such as a DVD player and an LD player, but also various equipment using a bus 40 can be used. Needless to say, this is also possible.

[0040]

According to the bus line control device of the present invention configured as described above, the first control unit in the hardware unit can be used.
When a failure is detected between the microcomputer, the hardware and the first microcomputer, or between the first microcomputer and the first bus receiver, the external unit directly controls the hardware through the first bus receiver without passing through the first microcomputer. Therefore, even if a failure occurs in the hardware unit, the hardware can be controlled from the external unit via the bus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration inside a CD player system showing an embodiment relating to a bus line control device of the present invention.

FIG. 2 is a flowchart illustrating a processing operation of a second microcomputer related to a failure avoiding process in the control unit according to the present embodiment.

FIG. 3 is a block diagram showing a schematic configuration inside a conventional CD player system.

[Explanation of symbols]

Reference Signs List 10 CD player system (bus line control device) 20 CD player (hardware unit, sound unit) 21 CD mechanical mechanism (hardware, sound signal source) 22 first bus receiver 23 first microcomputer 30 control unit (external unit) 33 Second microcomputer 33A Fault detecting means 33B Control means 34 Second bus receiver

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Maeda Clarion, Inc. 5-35-2 Hakusan, Bunkyo-ku, Tokyo (72) Inventor Tomoyuki Hirano 5-35-2 Hakusan, Bunkyo-ku, Tokyo Clarion Incorporated (72) Inventor Bunno Ueno 5-35-2 Hakusan, Bunkyo-ku, Tokyo F-term in Clarion Co., Ltd. 5B083 AA09 BB03 CD10 CE01 DD09 EE07 GG04

Claims (2)

[Claims] 1. A first method for receiving a bus control signal from a bus.
A bus receiver, and a first bus controller that controls hardware based on the bus control signal received by the first bus receiver.
A hardware unit including a microcomputer, a second microcomputer that generates a control signal based on an operation instruction, and a second bus receiver that generates the bus control signal based on a control signal generated by the second microcomputer. A bus line control device having an external unit, wherein the second microcomputer is configured to detect a failure between the hardware and the first microcomputer, between the first microcomputer and the first bus receiver, or a failure in the first microcomputer. Fault detecting means for detecting, and when a fault is detected by the fault detecting means, through the first bus receiver without passing through the first microcomputer,
A control unit for directly controlling the hardware. 2. The apparatus according to claim 1, wherein the hardware is a sound signal source that generates a sound signal, and the external unit is a control unit that controls the sound signal source through the first microcomputer. 2. The bus line control device according to 1.