JP4013735B2 - Wireless communication device embedded system and wireless program rewriting method in wireless communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication device built-in system in which a wireless communication device that performs wireless communication such as Bluetooth or wireless LAN, for example, and a method for rewriting a wireless program in the wireless communication device.
[0002]
[Prior art]
For example, there is an in-vehicle display mounted on a vehicle as an example of a wireless communication device built-in system in which a wireless communication device that performs wireless communication such as Bluetooth or wireless LAN is incorporated. According to this, the user brings a portable information terminal with a built-in wireless module that performs wireless communication such as Bluetooth and wireless LAN into the vehicle interior, and the wireless communication device incorporated in the portable information terminal and the in-vehicle display By performing wireless communication between them, desired information can be displayed on the in-vehicle display by operating the portable information terminal.
[0003]
By the way, for example, for the purpose of eliminating bugs and improving functions, it may be necessary to rewrite (update) a wireless program for the wireless communication apparatus to perform wireless communication. In such a case, in the conventional device, a memory for storing a new wireless program to be rewritten is provided separately from a memory for storing the original wireless program in the wireless communication device, and a new one to be rewritten from the outside is provided. After receiving a new wireless program, the wireless program was rewritten.
[0004]
[Problems to be solved by the invention]
However, in this case, a memory for storing a new wireless program to be rewritten must be prepared separately from a memory for storing the original wireless program in the wireless communication device. There is a problem that the cost of the entire system increases accordingly.
[0005]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to avoid an increase in the memory capacity of a wireless communication device in the case where a wireless communication device that performs wireless communication is incorporated. A wireless communication device built-in system and a wireless communication device capable of appropriately rewriting a wireless program for wireless communication performed by a wireless communication device while being configured to avoid an increase in the cost of the entire system An object of the present invention is to provide a wireless program rewriting method in a communication apparatus.
[0006]
[Means for Solving the Problems]
According to the wireless communication device built-in system described in claim 1 , the device-side storage means for storing the wireless program executes the wireless program stored in the device-side storage means and controls the wireless communication. The system-side control means that is provided separately from the control means and controls the overall operation of the system, when a wireless program is received from the outside, temporarily stores the received wireless program in the system-side storage means. After the operation of the wireless communication device is stopped, the wireless program temporarily stored in the system-side storage means is directly written and stored in the device-side storage means without going through the device-side control means Rewrite the wireless program.
[0007]
In this way, a new wireless program to be rewritten is temporarily stored in the system-side storage unit different from the wireless communication device, and after the operation of the wireless communication device is stopped, the system-side storage unit temporarily The new wireless program to be rewritten is configured to be directly written and stored in the device-side storage means without going through the device-side control means. It is possible to eliminate the need to prepare storage means for storing a new wireless program to be rewritten. As a result, by avoiding an increase in the memory capacity of the wireless communication device, an increase in the cost of the entire system can be avoided in advance, but the wireless communication device can perform wireless communication. The radio program can be rewritten appropriately.
[0010]
According to the method for rewriting a wireless program in the wireless communication device according to claim 2 , the system-side control unit different from the wireless communication device stores the wireless program received from outside the system-side storage unit different from the wireless communication device. A procedure for temporarily storing the wireless communication apparatus, a procedure for the system-side control means to stop the operation of the wireless communication device, and a wireless program temporarily stored in the system-side storage means by the system-side control means for wireless communication The wireless program is rewritten by sequentially performing the procedure of directly writing and storing in the device-side storage means separate from the device-side control means without going through the device-side control means of the device.
[0011]
As a result, in the same manner as described in claim 1 above, by avoiding an increase in the memory capacity of the wireless communication device, it is possible to avoid an increase in the cost of the entire system. Nevertheless, the wireless program for the wireless communication apparatus to perform wireless communication can be appropriately rewritten.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to, for example, a vehicle-mounted display mounted on a vehicle will be described with reference to FIGS.
First, FIG. 1 shows a schematic configuration of an in-vehicle display as a functional block diagram. The in-vehicle display 1 (system according to the present invention) includes a wireless communication device 2, a system CPU 3 (system-side control means according to the present invention), a system memory 4 (system-side storage means according to the present invention), and A peripheral circuit 5 is provided.
[0015]
The wireless communication device 2 performs wireless communication such as Bluetooth or wireless LAN, for example, and includes an RF circuit 6, a device memory 7 (device-side storage means in the present invention), and a device CPU 8 (device-side control means in the present invention). It is composed of The device memory 7 has a storage area with a predetermined capacity, and stores a wireless program for performing wireless communication in the storage area. The device CPU 8 is composed mainly of a microcomputer, and controls wireless communication by executing a wireless program stored in the device memory 7.
[0016]
The system memory 4 has a storage area with a predetermined capacity larger than the predetermined capacity of the device memory 7, and stores a system program in the storage area. The system CPU 3 is configured mainly with a microcomputer, and controls the overall operation of the in-vehicle display 1 by executing a system program stored in the system memory 4. In this case, the system memory 4 is configured to be able to store a wireless program in an empty area of the storage area, and the system CPU 3 stores the wireless program stored in the system memory 4 in the device memory 7 of the wireless communication device 2. It can be directly written in and stored in.
[0017]
The peripheral circuit 5 includes a power supply circuit 9 that controls the supply of power from the outside, a clock circuit 10 that performs timekeeping operation, a switch 11 that is operated by the user, an LCD 12 that displays images and characters, a speaker 13 that outputs sound, and a sound And a peripheral device interface circuit 15 having an interface function with external devices such as a car navigation device, an audio device, and various sensors.
[0018]
Next, processing for rewriting a wireless program of the wireless communication device 2 as an operation of the above-described configuration will be described with reference to FIG. Here, FIG. 2 shows a process performed by the system CPU 3 as a flowchart.
[0019]
First, the system CPU 3 detects that a trigger for rewriting the wireless program of the wireless communication device 2 (for example, a switch operation by the switch 11, an external rewriting instruction, a periodic rewriting timing, etc.) has occurred ( In step S1, "YES"), by outputting a wireless communication link establishment instruction to the device CPU 8 of the wireless communication device 2, the RF circuit 6 of the wireless communication device 2 and the wireless program to be rewritten by the wireless communication device 2 are held. A wireless communication link is established with a terminal (not shown) in operation (step S2), and reception of a wireless program from the terminal is started (step S3). Thereafter, the system CPU 3 inputs the wireless program received from the terminal to the RF circuit 6 of the wireless communication device 2 through the device CPU 8 and stores it in the system memory 4 step by step (step S4). In this case, the system CPU 3 can also perform data compression processing on the wireless program and store it in the system memory 4 by adopting data compression technology.
[0020]
Next, when the system CPU 3 detects that the reception of the wireless program from the terminal is completed (“YES” in step S5), the system CPU 3 outputs a wireless communication link release instruction to the device CPU 8 of the wireless communication device 2 to The wireless communication link established between the RF circuit 6 of the communication device 2 and the terminal is released (step S6). Next, the system CPU 3 stops the operation of the wireless communication device 2 by outputting an operation stop instruction to the device CPU 8 of the wireless communication device 2 (step S7).
[0021]
Then, the system CPU 3 reads the wireless program stored in the system memory 4 (step S8), and directly writes the read wireless program into the device memory 7 of the wireless communication device 2 for storage (step S9).
[0022]
Through the processing described above, the wireless program stored in the device memory 7 of the wireless communication device 2 is rewritten. Thereafter, when the operation stop of the wireless communication device 2 is released, the device CPU 8 in the wireless communication device 2 is released. Executes the rewritten wireless program to control the wireless communication.
[0023]
As described above, according to the first embodiment, when the wireless program is rewritten in the in-vehicle display 1, a new wireless program to be rewritten is temporarily stored in the system memory 4 separate from the wireless communication device 2. After the storage and the operation of the wireless communication apparatus 2 are stopped, a new wireless program to be rewritten that is temporarily stored in the system memory 4 is directly written and stored in the apparatus memory 7.
[0024]
Therefore, it is not necessary to prepare a memory for storing a new wireless program to be rewritten in the wireless communication device 2. Accordingly, by avoiding an increase in the memory capacity of the wireless communication device 2, it is possible to avoid an increase in the cost of the in-vehicle display 1 as a whole, but the wireless communication device 2 can perform wireless communication. It is possible to appropriately rewrite the wireless program for performing.
[0025]
(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The description of the same parts as those in the first embodiment will be omitted, and different parts will be described. In the first embodiment described above, the system CPU 3 rewrites the wireless program stored in the device memory 7 alone. On the other hand, in the second embodiment, the system CPU and the device CPU cooperate. Thus, the wireless program stored in the device memory 7 is rewritten.
[0026]
That is, in the in-vehicle display 21, the system CPU 22 (system-side control means in the present invention) does not directly write and store the wireless program stored in the system memory 4 in the device memory 7 of the wireless communication device 23. The wireless program stored in the system memory 4 is transferred to the device CPU 24 (device-side control means in the present invention), and the device CPU 24 writes the wireless program transferred from the system CPU 22 in the device memory 7 for storage. .
[0027]
Here, FIG. 4 shows a process performed by the system CPU 22 as a flowchart, and FIG. 5 shows a process performed by the apparatus CPU 24 as a flowchart.
[0028]
In this case, the system CPU 22 outputs a wireless operation stop instruction to the device CPU 24 of the wireless communication device 23 after performing the series of processing of steps S1 to S6 described in the first embodiment, thereby enabling wireless communication. Although only the operation related to the wireless communication in the communication device 23 is stopped (step S11), the operation related to the data transfer between the device CPU 24 and the system CPU 22 in the wireless communication device 23 is not stopped.
Then, the system CPU 22 reads the wireless program stored in the system memory 4 (step S12), and transfers the read wireless program to the device CPU 24 of the wireless communication device 23 (step S13).
[0029]
In response to this, when the device CPU 24 detects that the wireless program has been transferred from the system CPU 22 (“YES” in step T1), the transferred wireless program is written and stored in the device memory 7 (step T2). ).
[0030]
Through the processing described above, the wireless program stored in the device memory 7 of the wireless communication device 23 is rewritten, and thereafter, when the operation stop related to wireless communication in the wireless communication device 23 is released, the wireless communication device 23 The device CPU 24 controls the wireless communication by executing the rewritten wireless program.
[0031]
As described above, according to the second embodiment, when the wireless program is rewritten in the in-vehicle display 21, a new wireless program to be rewritten is temporarily stored in the system memory 4 different from the wireless communication device 23. After storing and stopping the operation related to the wireless communication in the wireless communication device 23, a new wireless program to be rewritten temporarily stored in the system memory 4 is transferred to the device CPU 24 of the wireless communication device 23, and the device The memory 7 is written and stored.
[0032]
Accordingly, it is possible to eliminate the need to prepare a memory for storing a new wireless program to be rewritten in the wireless communication device 23 in the same manner as described in the first embodiment. Thus, by avoiding an increase in the memory capacity of the wireless communication device 23, it is possible to avoid an increase in the cost of the in-vehicle display 21 as a whole. It is possible to appropriately rewrite the wireless program for performing.
[0033]
(Other examples)
The present invention is not limited to the embodiments described above, and can be modified or expanded as follows.
The configuration may be applied not only to the in-vehicle display but also to other devices in which a wireless communication device is incorporated.
The wireless communication device is not limited to Bluetooth or wireless LAN, but may be DSRC (Dedicated Short Range Communication) or infrared communication.
A configuration in which a wireless program is received by a wireless communication device through a network from a server installed at a remote location may be employed.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a first embodiment of the present invention. FIG. 2 is a flowchart showing processing performed by a system CPU. FIG. 3 is a functional block diagram of a second embodiment of the present invention. FIG. 5 is a flowchart showing processing performed by the apparatus CPU.
In the drawings, 1 is an in-vehicle display (system), 2 is a wireless communication device, 3 is a system CPU (system side control means), 4 is a system memory (system side storage means), 7 is an apparatus memory (device side storage means), Reference numeral 8 denotes an apparatus CPU (apparatus side control means), 21 denotes an in-vehicle display (system), 22 denotes a system CPU (system side control means), 23 denotes a wireless communication apparatus, and 24 denotes an apparatus CPU (apparatus side control means).

Claims (2)

A wireless communication device comprising device-side storage means for storing a wireless program and device-side control means for controlling the wireless communication by executing the wireless program stored in the device-side storage means;
System-side storage means for storing a system program;
A wireless communication device built-in system comprising system side control means for controlling the overall operation of the system by executing a system program stored in the system side storage means,
The device-side storage means is provided separately from the device-side control means,
The system-side control means temporarily stores the wireless program received from the outside in the system-side storage means, stops the operation of the wireless communication device, and is temporarily stored in the system-side storage means. A wireless communication device built-in system, wherein a wireless program is rewritten by directly writing and storing a stored wireless program in the device storage means without going through the device control means . A method of rewriting a wireless program of a wireless communication device incorporated in a system,
A procedure for temporarily storing a wireless program received from the outside by a system-side control unit different from the wireless communication device in a system-side storage unit different from the wireless communication device;
A procedure for the system-side control means to stop the operation of the wireless communication device;
The system-side control means stores the wireless program temporarily stored in the system-side storage means in a device-side storage means separate from the apparatus-side control means without going through the device-side control means of the wireless communication device. By sequentially performing the procedure of direct writing and storing,
A method for rewriting a wireless program in a wireless communication device, wherein the wireless program is rewritten.

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