JP2022119366A - Electronic instrument - Google Patents

Abstract

To provide an electronic instrument that makes it possible to check if a switch is changed over after performing control to change over the switch.SOLUTION: An electronic instrument 100 comprises: a first substrate 10; a second substrate 20; and a connection part 30 that connects the first substrate 10 and second substrate 20. The first substrate 10 has a control circuit 13 that controls a circuit the second substrate 20 has, and the second substrate 20 has: a switch 22; and an IO expander 23 that controls the switch on the basis of control by a control unit. The switch 22 is a switch in which a state changes over on the basis of a change-over signal the IO expander 23 outputs, and the IO expander 23 has: a first output port that outputs a change-over switch corresponding to a switch change-over command a control unit 13 outputs for causing the switch 22 to be changed over; an input port to which the change-over signal is input; and a second output port that outputs an interruption signal relative to the control unit 13 in response to the input of the change-over signal to the input port.SELECTED DRAWING: Figure 1

Description

The present invention relates to electronic equipment.

2. Description of the Related Art Conventionally, a switch is known that switches whether to cut off the output of an electric signal or the supply of electric power. Japanese Unexamined Patent Application Publication No. 2002-200003 discloses an input device that switches between power supply and power cutoff based on a port output signal.

JP 2011-221659 A

When switching the switch using conventional techniques, it is not possible to confirm that the state of the switch has switched after outputting the port output signal. Therefore, when the state of the switch is not properly switched, there is a problem that the device equipped with the switch operates erroneously.

Therefore, the present invention has been made in view of these points, and it is an object of the present invention to enable a device that controls a switch to confirm that the switch has been switched after switching the switch.

An electronic device according to an aspect of the present invention includes a first substrate, a second substrate, and a connection portion that connects the first substrate and the second substrate, wherein the first substrate is connected to the second substrate. the second substrate includes a switch and a switch control unit that controls the switch based on the control of the control unit; the switch controls the switch control unit a switch whose state is switched based on a switching signal output by the first output port for outputting the switching signal corresponding to the switch switching command output by the control unit for switching the switch. and an input port to which the switching signal is input, and a second output port for outputting an interrupt signal to the control unit in response to input of the switching signal to the input port.

When the interrupt signal is obtained, the control unit outputs a switch confirmation command for confirming a switched state of the switch to the switch control unit, and the switch control unit receives the switch confirmation command. , data corresponding to a level indicated by the switching signal input to the input port may be output to the control unit.

When the level indicated by the switching signal corresponding to the switch switching command is different from the level indicated by the switching signal obtained by outputting the switch confirmation command, the control unit retransmits the switch switching command. may

ADVANTAGE OF THE INVENTION According to this invention, it is effective in being able to confirm that the switch was switched after performing control which switches a switch.

It is a figure which shows the structure of the electronic device 100 which concerns on this embodiment. 4 is a diagram for explaining the operation of checking the switching state of the switch 22 by the control circuit 13. FIG. 4 is a flowchart showing the flow of operations in the control circuit 13; It is a figure which shows the structure of the electronic device 100 which concerns on a modification.

[Configuration of electronic device 100]
FIG. 1 is a diagram showing the configuration of an electronic device 100 according to this embodiment. Electronic device 100 is, for example, a switching device, and has a switching function of switching whether to output a received input signal. The electronic device 100 includes a first substrate 10 , a second substrate 20 and a connection section 30 . The first substrate 10 is a substrate having a control section that controls the circuits of the second substrate 20 . The first board 10 has an I2C (Inter-Integrated Circuit) driver 11 , an IO (Input Output) register 12 and a control circuit 13 .

The second board 20 has an I2C driver 21 , a switch 22 and an IO (Input Output) expander 23 . The connection part 30 is, for example, a flexible cable, and connects the first substrate 10 and the second substrate 20 . For communication between the first substrate 10 and the second substrate 20, for example, serial communication such as an I2C bus or signals such as interrupt signals are used.

The I2C driver 11 has an I2C controller for transmitting/receiving data via the I2C interface, and transmits/receives data to/from the second board 20 via the connection section 30 . The I2C driver 11 transmits data output from the control circuit 13 to the second board 20 and inputs data output from the second board 20 to the control circuit 13 .

The IO register 12 has a storage circuit. The IO register 12 stores data generated by the control circuit 13 or data acquired by the control circuit 13 under the control of the control circuit 13 . The IO register 12 stores at least one of data transmitted from the control circuit 13 to the second board 20 and data acquired from the second board 20 by the control circuit 13, for example.

The control circuit 13 is a circuit including, for example, a CPU (Central Processing Unit), and the CPU executes a program to control the circuits of the second substrate 20 . The control circuit 13 functions as a control section for switching the switch 22 . The control circuit 13 outputs a switch switching command for switching the state of the switch 22 via the I2C driver 11, the I2C bus, and the I2C driver 21 to the IO expander 23 functioning as a switch control unit.

The control circuit 13 has a terminal g for acquiring an interrupt signal output by the IO expander 23 . The interrupt signal is a signal generated by the IO expander 23, for example, and is input to the terminal g. When the control circuit 13 acquires the interrupt signal, the control circuit 13 outputs a switch confirmation command for confirming the switched state of the switch 22 to the IO expander 23 via the I2C driver 11, the I2C bus, and the I2C driver 21. good too. The control circuit 13 outputs a switch confirmation command to the IO expander 23 to obtain a switching value indicating the level of the switching signal output by the IO expander 23 to control the state of the switch 22 .

In this way, the control circuit 13 acquires the switching value based on the acquisition of the interrupt signal generated by the IO expander 23, thereby quickly confirming whether or not the switch 22 has been properly switched. can.

If the level indicated by the switching signal corresponding to the switch switching command is different from the level indicated by the switching signal obtained by outputting the switch confirmation command, the control circuit 13 may retransmit the switch switching command. When the level of the switching signal indicated by the switch switching command differs from the level indicated by the switching value obtained by outputting the switch confirmation command, the control circuit 13 determines that the switching state of the switch 22 is not appropriate. When the control circuit 13 determines that the state of the switch 22 is not appropriate, it retransmits the switch switching command. Thus, by retransmitting the switch switching command when the control circuit 13 determines that the switching state of the switch 22 is not appropriate, it is possible to prevent the switch 22 from being maintained in an inappropriate state.

The I2C driver 21 has an I2C controller for transmitting/receiving data via the I2C interface, and transmits/receives data to/from the first board 10 via the connecting section 30 . The I2C driver 21 , for example, transmits data output by the first board 10 to the IO expander 23 and transmits data output by the IO expander 23 to the first board 10 .

The switch 22 is a switch whose state is switched based on a switching signal output by the switch control section. The switch 22 switches whether to output the input signal based on the level indicated by the switching signal output by the IO expander 23 . The switch 22 has a terminal a for receiving an input signal, a terminal b for outputting the received input signal, and a terminal c connected to a terminating resistor. The switch 22 connects the terminal a and the terminal b when outputting the input signal, and connects the terminal a and the terminal c when not outputting the input signal.

The IO expander 23 functions as a switch control section that controls the switch 22 under the control of the control circuit 13 of the first substrate 10 . The IO expander 23 is a circuit that transmits and receives electrical signals to and from each of the multiple circuits that the first substrate 10 and the second substrate 20 have. The IO expander 23 has a terminal d, a terminal e, and a terminal f.

A terminal d is a first output port that outputs a switching signal corresponding to the switch switching command output by the control circuit 13 . A terminal e is an input port to which a switching signal output from the terminal d, which is the first output port, is input. A terminal f is a second output port that outputs an interrupt signal to the control circuit 13 in response to input of a switching signal to a terminal e, which is an input port. An interrupt signal output from the terminal f is input to the terminal g of the control circuit 13 via the connection section 30 .

When the IO expander 23 acquires the switch switching command output by the control circuit 13 , the IO expander 23 switches the switch 22 by outputting a switching signal corresponding to the switch switching command from the terminal d. For example, when the IO expander 23 outputs a high level switching signal, the switch 22 connects the terminal a and the terminal b to output the input signal. On the other hand, when the IO expander 23 outputs a low level switching signal, the switch 22 connects the terminal a and the terminal c so as not to output the input signal.

The IO expander 23 outputs an interrupt signal to the control circuit 13 from the terminal f in response to the switching signal output from the terminal d being input to the terminal e. By operating the IO expander 23 in this manner, the second board 20 can notify the control circuit 13 of the timing of outputting the switching signal corresponding to the switch switching command output by the control circuit 13 . As a result, the control circuit 13 can quickly confirm whether or not the switch 22 has been properly switched by outputting the switch switching command.

When the IO expander 23 acquires the switch confirmation command output by the control circuit 13 , it outputs to the control circuit 13 data corresponding to the level indicated by the switching signal input to the terminal e, which is an input port. By notifying the control circuit 13 of the level indicated by the switching signal output by the IO expander 23 in this manner, the control circuit 13 can confirm the state of the switch 22 .

FIG. 2 is a diagram for explaining the operation of checking the switching state of the switch 22 by the control circuit 13. As shown in FIG. A bus signal is an instruction or data transmitted and received between the control circuit 13 and the IO expander 23 using the I2C bus. The switching signal is an electrical signal that the IO expander 23 outputs to the switch 22 . The interrupt signal is an electrical signal that the IO expander 23 outputs to the control circuit 13 .

At time T<b>1 , the control circuit 13 outputs a switch switching command to the IO expander 23 to switch the switch 22 . At time T<b>2 , the IO expander 23 outputs a switching signal corresponding to the switch switching command output by the control circuit 13 . The IO expander 23 changes the switching signal output from the terminal d from low level to high level.

At time T3, the IO expander 23 outputs an interrupt signal to the control circuit 13 in response to the input of the switching signal changed from low level to high level to the terminal e. The IO expander 23 changes the interrupt signal output from the terminal f from high level to low level.

At time T4, the control circuit 13 outputs a switch confirmation command to the IO expander 23 to confirm the switching state of the switch 22 in response to the input of the interrupt signal to the terminal g. At time T5, the IO expander 23 outputs a switching value indicating the level of the switching signal input to the terminal e to the control circuit 13, and changes the interrupt signal output from the terminal f from low level to high level.

[Operation Flowchart of Control Circuit 13]
FIG. 3 is a flow chart showing the flow of operations in the control circuit 13. As shown in FIG. The control circuit 13 outputs a switch switching command to the IO expander 23 (S11). When the control circuit 13 acquires an interrupt signal output by the IO expander 23 (YES in S12), it outputs a switch confirmation command to the IO expander 23 (S14). By outputting the switch confirmation command, the control circuit 13 acquires a switching value indicating the level of the switching signal output by the IO expander 23 (S15).

The control circuit 13 confirms whether or not the level of the switching signal corresponding to the output switch switching command is different from the level indicated by the acquired switching value. When the control circuit 13 determines that the switching value is correct because the level indicated by the switching value and the level of the switching signal corresponding to the switch switching command are the same (YES in S16), switching of the switch 22 is appropriate. (S17).

On the other hand, if it is determined that the switching value is incorrect because the level indicated by the switching value differs from the level of the switching signal corresponding to the switch switching command (NO in S16), the control circuit 13 retransmits the switch switching command. Check whether or not the specified number of times has been exceeded. The predetermined number of retransmissions is, for example, five times, and is stored in a storage section (not shown) of the control circuit 13 . If the predetermined number of retransmissions has been exceeded (YES in S18), the control circuit 13 determines that switching of the switch 22 is inappropriate (S19). If the predetermined number of retransmissions has not been exceeded (NO in S18), the control circuit 13 outputs a switch switching command for retransmission (S11).

If the control circuit 13 does not acquire the interrupt signal output by the IO expander 23 (NO in S12), it checks whether a predetermined time has passed since the switch switching command was output (S13). . The predetermined time is, for example, the time required from when the control circuit 13 outputs a switch switching command to when the IO expander 23 outputs a switching signal, and is the data transmission time generated through the connection unit 30. and the time for the IO expander 23 to output the switching signal.

If a predetermined time has passed since the control circuit 13 output the switch switching command (YES in S13), the control circuit 13 checks whether the number of retransmissions of the switch switching command has exceeded a predetermined number of retransmissions. If the number of retransmissions exceeds the predetermined number (YES in S18), the control circuit 13 determines that switching of the switch 22 is inappropriate (S19). On the other hand, if the number of retransmissions does not exceed the predetermined number (NO in S18), the control circuit 13 outputs a switch switching command for retransmission (S11).

[Modification]
In the above description, the control circuit 13 switches the switch 22 by outputting the switch switching command. On the other hand, the control circuit 13 may switch the switch 22 by outputting a switching control signal, which is an electrical signal, via the connection section 30 . FIG. 4 is a diagram showing a configuration of electronic device 100 according to a modification. The electronic device 100 shown in FIG. 4 is different from the electronic device 100 shown in FIG. 1 in that it has a SW (Switch) switching circuit 24, but is the same in other respects.

The SW switching circuit 24 is, for example, a circuit having a toggle flip-flop. The SW switching circuit 24 has a terminal j and a terminal k, and changes the level indicated by the switching signal to be output to the terminal k in accordance with the change in the level indicated by the signal input to the terminal j. The signal input to the terminal j is the switching control signal output from the terminal h of the control circuit 13 .

The SW switching circuit 24 changes the level of the switching signal to be output to the terminal k from low level to high level in response to the change of the switching control signal input to the terminal j from low level to high level or from high level to low level. change. The switch 22 switches the state of the switch based on the switching signal output from the terminal k. By operating in this manner, the control circuit 13 can switch the state of the switch 22 in a shorter time than it takes to output the switch switching command.

[Effect of electronic device 100]
As described above, electronic device 100 includes first substrate 10 and second substrate 20 . The first substrate 10 has a control circuit 13 that outputs a switch switching command to switch the switch 22 . The second substrate 20 has a switch 22 and an IO expander 23 that outputs a switching signal for switching the switch 22 .

Then, the IO expander 23 outputs an interrupt signal to the control circuit 13 in response to the switching signal being input to the input port. timing can be obtained. As a result, the control circuit 13 can quickly confirm whether or not the switch 22 has been properly switched, so that it is possible to prevent the electronic device 100 from operating erroneously.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

10 First substrate 11 I2C driver 12 IO register 13 Control circuit 20 Second substrate 21 I2C driver 22 Switch 23 IO expander 24 SW switching circuit 30 Connection part 100 Electronic equipment

Claims (3)

A first substrate, a second substrate, and a connection portion that connects the first substrate and the second substrate,
The first substrate has a control unit that controls the circuit of the second substrate,
the second substrate includes a switch and a switch control section that controls the switch based on the control of the control section;
the switch is a switch whose state is switched based on a switching signal output by the switch control unit;
The switch control unit
a first output port for outputting the switching signal corresponding to the switch switching command output by the control unit to switch the switch;
an input port to which the switching signal is input;
a second output port that outputs an interrupt signal to the control unit in response to the switching signal being input to the input port;
has a
Electronics. The control unit, when acquiring the interrupt signal, outputs a switch confirmation command for confirming a switched state of the switch to the switch control unit,
When the switch confirmation command is acquired, the switch control unit outputs data corresponding to the level indicated by the switching signal input to the input port to the control unit.
The electronic device according to claim 1. The control unit retransmits the switch switching command when the level indicated by the switching signal corresponding to the switch switching command is different from the level indicated by the switching signal obtained by outputting the switch confirmation command. ,
The electronic device according to claim 2.

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