JPH05108492A - Electronic musical instrument - Google Patents

Abstract

PURPOSE:To display fault diagnosis result an a display element an a microcomputer's output part by instructing fault diagnosis about electronic musical instrument's RAM with an input switch on a microcomputer's input port. CONSTITUTION:When a power source is turned on, a microcomputer 8 fetches the program of a ROM part 1 and initializes the microcomputer and then decides input switch 91's on/off state of the microcomputer 8. If the switch is on, it initializes a memory address and then writes/reads data so as to perform fault diagnosis of a RAM part 2. If OK, it increments address and continues to decide reading/writing data until an area completes. The result is displayed on a display element provided on a microcomputer 8's output port as a means for visual feedback of the fault. Until the fault diagnosis completes, a sub-routine is not called and a RAM part 2's stack area is not used so as to prevent runaway.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic musical instrument having a writable and readable memory (RAM), and enables failure detection of its constituent elements and wiring.

[0002]

2. Description of the Related Art In recent years, electronic musical instruments have been digitized, and a method using a writable and readable memory (RAM) has come to be used so that tone color selections and musical instrument selections can be stored and reproduced. .

A conventional electronic musical instrument will be described below.
FIG. 3 is a control block diagram for explaining a conventional electronic musical instrument. This electronic musical instrument is a device controlled by a microcomputer 8, and the microcomputer 8 is connected to each section via a bus 10. The bus 10 includes a ROM section 1, a RAM section 2, a musical sound generation section 3, a keyboard section 5, a panel operation section 6, and a panel display section 7.
Are connected.

Regarding the electronic musical instrument constructed as described above,
The operation will be described below. First, when the power is turned on, the microcomputer 8 fetches the program in the ROM section 1 and executes the processing. Information to be sent to the musical tone generating section 3 is prepared from the information of the keyboard section 5, the panel operating section 6, and the panel display section 7 on the RAM section 2, and the musical tone generating section is controlled to generate sound. On the other hand, as an input switch for activating the failure diagnosis, a switch such as a keyboard section or a panel operation section can be considered.

Further, in the program, a subroutine is called at any time. At that time, the values of registers and pointers are saved in the stack area of the RAM, and at the time of return, the processing is advanced while returning them from the stack.

[0006]

However, in the above-mentioned conventional configuration, a switch such as a keyboard section or a panel operation section is conceivable as an input switch for activating a failure diagnosis. Had a problem that the failure diagnosis of RAM could not be started.

In addition, if the RAM is broken, the contents of the stack are not fixed, and there is a problem of runaway when returning from the subroutine.

A first object of the present invention is to solve the above-mentioned conventional problems, and to provide a failure diagnosis system for an electronic musical instrument which can be activated by an input switch provided directly at an input port of a microcomputer. .

A second object of the present invention is to perform a failure diagnosis of the RAM when the failure diagnosis is instructed from the keyboard section or the panel operation section, or when the keyboard section or the panel operation section of the keyboard itself is out of order. It is an object of the present invention to provide a failure diagnosis system for electronic musical instruments, which is capable of giving instructions.

A third object of the present invention is to write and read data to and from a writable and readable memory (RAM) to determine a failure of a memory element or wiring, and to directly output the result to an output port of a microcomputer. It is an object of the present invention to provide a fault diagnosis system that can display on a provided display element and can provide visual feedback of a fault.

A fourth object of the present invention is to use the subroutine call without using the subroutine call until the failure determination is completed.
It is an object of the present invention to provide a failure diagnosis system in which the stack area is not used to prevent runaway and correct determination results can be fed back even when there is a failure in the RAM.

[0012]

In order to achieve this object, an electronic musical instrument according to a first aspect of the present invention activates a writable and readable memory and a failure diagnosis provided directly at an input port of a microcomputer when the power is turned on. And an input switch for turning on and off, and a means for writing / reading test data to / from the memory to determine a failure of a component or wiring of the memory, and the result directly provided to the output port of the microcomputer. Means for displaying on the display element.

An electronic musical instrument according to a second aspect of the invention is provided with means for not using the stack on the RAM until the above processing is completed.

[0014]

With this configuration, the failure diagnosis of the RAM for the electronic musical instrument is instructed by the input switch provided directly at the input port of the microcomputer, and the result is displayed on the display element provided directly at the output port of the microcomputer. However, since it is possible to provide visual feedback of the failure and the stack on the RAM is not used, there is a failure diagnosis system that can correctly feed back the judgment result even if there is a failure in the constituent elements or wiring of the RAM section. It is possible to provide an electronic musical instrument.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, this electronic musical instrument is a microcomputer 8
Is a device controlled by the
It is connected to each part via. A ROM section 1, a RAM section 2, a musical sound generating section 3, a keyboard section 5, a panel operating section 6, and a panel display section 7 are connected to the bus 10. Switch 9 corresponding to input port 81 and output port 82 of microcomputer 8
1. A display element 92 and a limiting resistor 93 for the display element.

Regarding the electronic musical instrument configured as described above,
The operation will be described with reference to FIG. First, when the power is turned on, the microcomputer 8 fetches the program in the ROM section 1 and executes the processing. First, the initial setting 22 of the microcomputer is performed, then the determination 23 of the input switch 91 provided directly to the input port of the microcomputer 8 is performed, and if the conditions are met, the initial address setting 24 of the memory is performed, and then Failure judgment 26 by writing and reading data 25
If it is OK, the address increment 27 is performed, and data writing and reading determination are performed until the area ends. Then, the result is displayed on a display element provided directly on the output port of the microcomputer 8 to provide visual feedback of the failure.

For example, a ton display is displayed by a Morse code when OK and a two display when NG. Even when there are a plurality of RAMs, the failure determination is made for each chip and the display is also made a plurality of times.

Further, until the failure judgment is completed, the subroutine call is not used, the stack area of the RAM is not used to prevent runaway, and the judgment result can be fed back correctly even when the RAM has a failure. I am doing it.

As described above, according to the present embodiment, a writable and readable memory, an input switch for directly activating a failure diagnosis provided directly in the input port of the microcomputer when the power is turned on, and if the switch is on. For example, by writing and reading the test data to and from the memory, it is possible to judge the failure of the constituent elements and wirings of the memory, and the means for not using the stack on the RAM is provided. It is possible to display on a display element provided directly on the output port of the.

In the present embodiment, the switch for starting the failure diagnosis and the block 9 of the display element may be added later by a service person at the time of service.

[0022]

As described above, according to the present invention of claim 1, a writable and readable memory, an input switch provided directly at an input port of a microcomputer when the power is turned on, for activating a failure diagnosis, and the switch thereof. If is on, a means for writing / reading test data to / from the memory to determine a failure of a memory element or wiring, and a result of the failure are visually displayed on a display element directly provided on the output port of the microcomputer. It is possible to realize an excellent electronic musical instrument that enables various kinds of feedback.

According to the present invention of claim 2, the subroutine call is not used until the failure determination is completed, the stack area of the RAM is not used to prevent runaway, and the determination result is obtained even when the RAM has a failure. It is possible to realize an electronic musical instrument equipped with a failure diagnosis system capable of correctly feeding back.

[Brief description of drawings]

FIG. 1 is a control block diagram of an electronic musical instrument according to an embodiment of the present invention.

FIG. 2 is a control flow chart of the electronic musical instrument according to the embodiment of the present invention.

FIG. 3 is a control block diagram of an electronic musical instrument in a conventional electronic musical instrument.

[Explanation of symbols]

1 Program ROM section 2 RAM section for writing / reading 3 Sound generation section 4 Speaker 5 Keyboard section 6 Panel operation section 7 Panel display section 8 Microcomputer 9 Block of switch and display element for activating failure diagnosis for electronic musical instrument 10 Bus 81 input port 82 output port 91 switch for activating fault diagnosis for electronic musical instrument 92 display element 93 limiting resistance of display element

Claims (2)

[Claims] 1. A writable and readable memory (RAM)
And an input switch for activating a fault diagnosis provided directly at the input port of the microcomputer when the power is turned on, and if the switch is on, write and read test data to and from the memory An electronic musical instrument having means for determining a failure of a component or wiring, and means for displaying the result on a display element provided directly at an output port of a microcomputer. 2. RA until the processing according to claim 1 is completed.
The electronic musical instrument according to claim 1, further comprising means for not using the stack on M.