JP2013078124A - Communication device, control method of communication device, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a communication device to recover from a power-saving state by receiving a predetermined packet via either a first interface or a second interface.SOLUTION: A communication device stores identification information of a first interface, and executes processing for shifting a state of a predetermined processing unit from a power-saving state to another operational state when the identification information of the first interface is included in a predetermined packet received from a second interface different from the first interface.

Description

The present invention relates to a communication device that shifts a processing unit from a power saving state to another operation state, and a method for controlling the communication device.

  Currently, many information processing apparatuses are equipped with a power management function for the purpose of suppressing power consumption. The power management function is a function that stops a part of functions during a period when the information processing apparatus is not used, and shifts the information processing apparatus to a power saving state (sleep mode).

  2. Description of the Related Art Conventionally, as a method for returning from a power saving state to a normal state, there is a technology that is provided in an information processing apparatus and uses detection of access to a communication interface. For example, a WOL (Wake-On-LAN) function is known in a network interface such as Ethernet (registered trademark). In WOL, when a specific packet is received via a network interface, the information processing apparatus is returned from a power saving state. As one of the specific packets used in this WOL, Magic Packet (trademark) developed by AMD is known.

  The Magic Packet is an Ethernet (registered trademark) packet including a special data pattern transmitted by broadcast, and generally uses a UDP (User Datagram Protocol) protocol. In the Magic Packet, a pattern in which a plurality of MAC (Media Access Control) addresses of the target information processing apparatus to be restored from the power saving state is repeated in the payload portion of the UDP packet. When the communication interface of the information processing apparatus recognizes that its own MAC address is described in the payload part of the received UDP packet of the Magic Packet, it outputs a signal for returning the entire device.

  Patent Document 1 describes a method for remotely starting a computer having a serial bus interface from an external device.

  Patent Document 2 describes a method of remotely starting a system by WOWLAN (Wake-On-Wireless-LAN), which is a wireless extension of WOL.

  On the other hand, multi-CPU systems equipped with a plurality of CPUs have recently increased in embedded devices and the like, and low power consumption is also required in such systems. Patent Document 3 describes a method for performing WOL in an information processing apparatus including a main CPU that controls the entire system and a sub CPU that controls preset control in the system.

JP 2000-209220 A JP 2005-018377 JP 2005-267100 A

  As described above, when sending a Magic Packet, it is necessary to include the MAC address of the communication interface included in the target information processing apparatus in the payload portion of the UDP packet. Therefore, in order to apply the WOL and WOWLAN functions to an information processing apparatus including a plurality of communication interfaces, the contents of the Magic Packet must be changed depending on which communication interface is used to transmit the Magic Packet. There is also an information processing apparatus configured not to operate all the communication interfaces at the same time even if a plurality of communication interfaces are provided. When transmitting a Magic Packet to such an information processing apparatus, the transmission source apparatus must generate a Magic Packet in consideration of which communication interface the destination information processing apparatus is using.

  An object of the present invention is to provide a suitable control method for shifting a predetermined processing unit from a power saving state to another operation state.

  In order to solve the above-described problem, the communication device of the present invention includes a storage unit that stores identification information of a first interface and a predetermined packet received by a second interface different from the first interface. In the case where the identification information of one interface is included, there is a transition unit that performs processing for shifting a predetermined processing unit from the power saving state to another operation state.

  In addition, a communication device according to another aspect of the present invention is different from the first interface that communicates with another communication device, storage means that stores identification information of the first interface, and the first interface. Transition means for performing processing for shifting the predetermined processing unit from the power saving state to another operation state when the identification information of the first interface is included in the predetermined packet received by the second interface And have.

  In addition, a communication device according to still another aspect of the present invention includes a second interface that communicates with another communication device, a storage unit that stores identification information of a first interface different from the second interface, Transition for performing processing for shifting a predetermined processing unit from a power saving state to another operation state when identification information of the first interface is included in a predetermined packet received by the second interface Means.

  According to the present invention, even if the identification information included in the predetermined packet is identification information of an interface different from the interface that received the packet, the predetermined processing unit is shifted from the power saving state to another operation state. Can be made.

Information processing apparatus capable of implementing the present invention Block diagram of an information processing apparatus that can implement the present invention Sequence diagram of the main communication processing unit The flowchart figure which shows the operation of the communication processing section The flowchart figure which shows the modification of operation | movement of a communication processing part.

Example 1
FIG. 1 shows a communication system to which the interface control method according to the present invention can be applied.

  The information processing apparatus 101 includes a main processing unit (main system) 102 and a communication processing unit (subsystem) 103. The main processing unit 102 is a system for controlling an application of the information processing apparatus 101. For example, if the information processing apparatus 101 is a printer, control related to printing is performed, if the camera is a camera, control related to imaging is performed, and if it is a display, control related to display is performed. The main processing unit 102 does not perform communication-related processing, and the communication processing unit 103 performs communication-related processing.

  The information processing apparatus 101 has a plurality of communication interfaces, and the communication processing unit 103 controls communication via each communication interface. In the example of FIG. 1, the communication processing unit 103 supports two communication methods, one communication method is wireless communication, and the other communication method is wired communication. It is assumed that the information processing apparatus 101 cannot operate the wired interface and the wireless interface at the same time.

  An interface for wired communication (hereinafter, “wired interface”) is, for example, a cable socket 104, and a communication interface for wireless communication (hereinafter, “wireless interface”) is, for example, an antenna 107.

  Each communication interface constructs a network with other devices via each communication medium. In the case of wired communication, it is connected to the network 110 via the cable communication device 106 via the cable socket 104 and the connection cable 105. Examples of the wired communication device 106 include a hub and a switch. In the case of wireless communication, the antenna 107 is connected to the network 110 via the air 108 and the wireless communication device 109. An example of the wireless communication device 109 is an access point (base station).

  The external device 111 is connected to the wired communication device 106 and the wireless communication device 109 via the network 110 and can perform data communication with the information processing device 101. For example, if the information processing apparatus 101 is a printer, the information processing apparatus 101 can perform printing by issuing a print instruction from the external apparatus 111 via the network.

  The information processing apparatus 101 is compatible with WOL (Wake-On-LAN) and WOWLAN (Wake-On-Wireless-LAN), and operates in either a normal operation state or a power saving state. When the information processing apparatus 101 is in a normal operation state, normal power is supplied to each circuit of the main processing unit 102 and the communication processing unit 103.

  On the other hand, when the information processing apparatus 101 is in the power saving state, the main processing unit 102 is in the application stopped state. In the power saving state, power supply to at least some of the circuits in the main processing unit 102 is stopped, the operating voltage is reduced, and the like. At that time, the communication processing unit 103 is in a state in which communication by either wired or wireless communication is possible, as before the power saving state.

  When the information processing apparatus 101 is in a power saving state, a communication packet is transmitted from the external apparatus 111 via a communication interface to each of the Magic Packets or a packet having the same function (hereinafter collectively referred to as an activation packet). Suppose that 103 received. Then, the main processing unit 102 shifts from the power saving state where the application is stopped to the normal operation state. In the case of Magic Packet, a broadcast address is stored as a destination in the header part of the UDP packet. The payload part (data part) stores a pattern in which a plurality of MAC addresses of communication interfaces included in the information processing apparatus to be restored from the power saving state are repeated. As described above, the activation packet in the present embodiment is a packet transmitted by broadcast, and the payload portion (data portion) identifies the communication interface of the target information processing apparatus that returns from the power saving state to the normal state. Information is stored.

  FIG. 2 is a block diagram illustrating an example of the configuration of the information processing apparatus 101.

  The main processing unit 102 includes a main CPU 201, a main memory 202, and a power control unit 203. The main CPU 201 is responsible for application control of the entire information processing apparatus.

  The main memory 202 stores a program executed by the main CPU 201 and plays a role as a data buffer memory handled by the main CPU 201.

  The power control unit 203 performs various controls related to the transition of the main processing unit 102 to the power saving state and the return from the power saving state to the normal operation state.

  A main bus 204 is used by the main CPU 201 to access each functional block or each IC.

  A local bus 205 is used by the communication control unit 207 to access each functional block or each IC.

  The communication processing unit 103 includes a bus bridge processing unit 206 and a communication control unit 207.

  The bus bridge processing unit 206 performs processing related to the connection between the main bus 204 and the local bus 205.

  The communication control unit 207 includes a sub CPU 217 and a sub memory 218, and controls the communication processing unit 103. The sub CPU 217 includes a comparison unit 208, a packet analysis unit 210, a transmission / reception processing unit 211, an interface control unit 212, and an interface monitoring unit 213. The sub memory 218 includes an identification information storage unit 214.

  The comparison unit 208 compares the identification information from the packet analysis unit 210 with the identification information of the communication interface held in the identification information storage unit 214. Then, when there is matching identification information, the comparison unit 208 outputs a wakeup signal to the power control unit 203. Reference numeral 209 denotes a signal line for transmitting a wake-up signal from the comparison unit 208 to the power control unit 203.

  The packet analysis unit 210 analyzes the activation packet received by the transmission / reception processing unit 211 and notifies the comparison unit 208 of the identification information described in the activation packet. The transmission / reception processing unit 211 is responsible for packet transmission processing or reception processing.

  The identification information storage unit 214 stores identification information of each communication interface included in the information processing apparatus 101. In this embodiment, identification information of the wired interface 215 and the wireless interface 216 is stored. The stored identification information is used for comparison with the identification information described in the activation packet.

  The interface control unit 212 specifies at least one communication interface that can receive the activation packet when the main processing unit 102 is in the power saving state. In this embodiment, one of the two communication interfaces (215, 216) is set in a standby state for an activation packet.

  Further, the interface control unit 212 writes the identification information of the communication interface in the identification information storage unit 214. Further, the interface control unit 212 receives a notification of the communication state of each communication interface from the interface monitoring unit 213. When the communication interface designated to wait for the activation packet is in a state where communication is impossible, the interface control unit 212 switches the other communication interface to the standby state.

  In the present embodiment, when the main processing unit 102 is in the power saving state, for example, it is designated to wait for the activation packet on the wired interface 215. At that time, when cable communication becomes impossible due to a cable disconnection or the like, the interface control unit 212 performs switching so that the wireless interface 216 waits. Further, the interface control unit 212 writes the identification information of the wireless interface 216 in the identification information storage unit 214.

  The interface monitoring unit 213 monitors the communication environment with the outside of each communication interface and notifies the interface control unit 212 of the communication state of each communication interface.

  Reference numeral 215 denotes an interface used for wired communication. As the wired communication, for example, an IEEE 802.3 wired LAN can be applied.

  Reference numeral 216 denotes an interface used for wireless communication. As the wireless communication, for example, an IEEE 802.11 wireless LAN can be applied. All the functional blocks have a mutual relationship in terms of software or hardware. Further, the functional block is an example, and a plurality of functional blocks may constitute one functional block, or any functional block may be further divided into blocks that perform a plurality of functions. For example, the interface monitoring unit 213 may be accommodated in each communication interface 215, 216. In this case, the interface monitoring unit 213 outputs an interrupt signal to the interface control unit 212 when the communication interface becomes unable to communicate. Then, when the interface control unit 212 receives the interrupt signal, the present invention can be implemented by performing control to enter the operation of switching the communication interface.

  Hereinafter, the present embodiment will be described with reference to FIG. FIG. 3 is a sequence diagram illustrating operations of the main processing unit 102, the communication processing unit 103, and the communication device 330 in the present embodiment. The communication device 330 is the wired communication device 106 or the wireless communication device 109 in FIG.

  In the initial state, the main processing unit 102 is in a power-off state or a power saving state. For example, when a button operation is performed by the user (301), the main processing unit 102 enters an activation process (302). Then, both the main processing unit 102 and the communication processing unit 103 are activated to enter a normal operation state (303, 304).

  In this state, the main processing unit 102 transmits a connection request to the communication processing unit 103 in order to establish a connection with the communication device 330 (305). The communication processing unit 103 determines a communication interface to be used in accordance with the connection request (306), and starts connection processing with the communication device 330 (307). For example, when communicating using the wireless interface 107, wireless connection processing is performed with the communication device 330 (in this case, the wireless communication device 109).

  When the series of connection processing is completed and the connection between the communication processing unit 103 and the communication device 330 is established (308), the communication processing unit 103 notifies the main processing unit 102 that the connection has been established (309). When the connection process with the communication device 330 is completed, communication via the network 110 with the external device 111 shown in FIG. 1 becomes possible.

  When the main processing unit 102 confirms that the connection with the communication device 330 has been established, the main processing unit 102 activates the application (310). Then, data used for the application is transmitted and received between the main processing unit 102 and the communication device 330 (311). Although not shown here, data used for an application is transmitted and received between the external device 111 and the main processing unit 102 shown in FIG. For example, when the information processing apparatus 101 is a printer and performs printing processing of an image using a printing application in response to an instruction from the external apparatus 111, image data, printing progress notification, error notification (no paper, ink Etc.) are communicated. When the application data communication (311) ends, the main processing unit 102 ends the requested application (312).

  The main processing unit 102, which no longer needs to execute the application, notifies the communication processing unit 103 that the state shifts to the power saving state (313), and shifts to the power saving state (314). For example, when a predetermined time has passed without any user operation after the application ends, the main processing unit 102 shifts to a power saving state.

  Upon receiving the notification of transition to the power saving state, the communication processing unit 103 stores the identification information of the communication interface capable of receiving the activation packet in the identification information storage unit 214 (315). Here, the identification information of the communication interface determined in 306 is stored in the identification information storage unit 214.

  Here, when the connection with the communication device 330 is disconnected for some reason (316), the communication processing unit 103 switches the communication interface that waits for reception of the activation packet (317). Then, a connection is established with the communication device 330 via the switched communication interface (318). For example, if a wireless connection has already been established with the communication device 330 (wireless communication device 109) at 308 via the wireless interface 216, if the wireless connection is disconnected at 316 due to a change in radio wave environment, at 317 Switch to the wired interface 215. Then, at 318, a connection is established with the communication device 330 (here, the wired communication device 106) via the wired interface 215. If the wired connection is already established via the communication type 330 (wired communication device 106) and the wired interface 215 at 308, the wireless interface 216 is switched to 317 when the connection cable is disconnected. At 318, wireless connection is established with the communication device 330 (here, the wireless communication device 109) via the wireless interface 216.

  When the connection with the communication device 330 is established, the communication processing unit 103 stores in the identification information storage unit 214 the identification information of the communication interface that is in the standby state for the activation packet (319).

  Here, it is assumed that the activation packet is transmitted from the communication device 330 to the communication processing unit 103 via the communication interface in the activation packet waiting state (320). The communication processing unit 103 analyzes the received activation packet (321), and compares the identification information of the communication interface included in the activation packet with the identification information held in the identification information storage unit 214 (322). . If there is matching identification information as a result of the comparison, the communication processing unit 103 transmits a wakeup signal to the main processing unit 102 in the power saving state (323). For example, when the activation packet is received via the wired interface 215, the wakeup signal is transmitted even if the identification information included in the activation packet is the identification information of the wireless interface 216.

  The main processing unit 102 that has received the wake-up signal starts processing for shifting from the power saving state to the normal operation state (324), and returns to the normal operation state (325).

  For example, in the system of FIG. 1, after the information processing apparatus 101 performs application data communication with the external apparatus 111 via the wireless communication device 109, the main processing unit 102 is omitted if the information processing apparatus 101 is not operated for a predetermined time. Transition to power state. Thereafter, when communication via the wireless interface 107 (216) becomes impossible due to a change in the radio wave environment, the information processing apparatus 101 switches the operation interface to the wired interface 104 (215), and the wired communication device 106 Establish a connection.

  Here, it is assumed that the identification information of the wireless interface 107 is included in the activation packet and transmitted so that the external device 111 performs data communication with the information processing device 101 again. At this time, since the wireless connection between the wireless interface 107 and the wireless communication device 109 is disconnected, the activation packet does not reach the wireless interface 107. However, since the activation packet is a broadcast packet, the activation packet reaches the wired interface 104 via the wired communication device 106. The communication processing unit 103 confirms the identification information included in the activation packet received via the wired interface 104, and cancels the power saving state of the main processing unit 102 if the identification information matches the identification information of the wireless interface 107. Send a wake-up signal.

  As described above, the information processing apparatus according to this embodiment is in the power saving state even when the identification information included in the activation packet received via any one communication interface matches the identification information of another communication interface. Operates to return from.

  FIG. 4 is a flowchart showing the operation of the communication processing unit 103 when the main processing unit 102 shifts to the power saving state.

  When the main processing unit 102 shifts to the power saving state, the flow of FIG. 4 is started (S401). First, the interface control unit 212 writes and stores the identification information of the communication interface in operation, that is, the communication interface in the start-up packet standby state, in the identification information storage unit 214 (S402). Then, the interface control unit 212 determines from the communication status of each communication interface notified from the interface monitoring unit 213 whether or not an activation packet can be received via the active communication interface (S403). If it is determined that the activation packet can be received, the process proceeds to S407. If it is determined that the activation packet cannot be received, the process proceeds to S404.

  In S404, the interface control unit 212 switches the communication interface that waits for the activation packet. The interface control unit 212 designates a communication interface that can receive an activation packet based on the communication status of each communication interface notified by the interface monitoring unit 213.

  Next, the interface control unit 212 determines whether or not it is necessary to write the identification information of the communication interface designated in S404 in the identification information storage unit 214 (S405). If the identification information of the communication interface specified in S404 is already stored in the identification information storage unit 214, the process proceeds to S407, and if not, the process proceeds to S406. In step S406, the interface control unit 212 writes and stores the identification information of the communication interface designated in step S404 in the identification information storage unit 214. In S407, the communication processing unit 103 proceeds to S408 when the transmission / reception processing unit 211 receives an activation packet for determining whether or not an activation packet from an external communication device has been received, and a predetermined time has elapsed. If no activation packet is received, the process proceeds to S403.

  When an activation packet is received from an external communication device (Yes in S407), the packet analysis unit 210 performs an activation packet analysis process (S408), and notifies the comparison unit 208 of communication interface identification information included in the activation packet. .

  The comparison unit 208 compares the identification information notified from the packet analysis unit 210 with the identification information stored in the identification information storage unit 214, and determines whether there is matching identification information (S409). ).

  If there is matching identification information as a result of the comparison, the process proceeds to S410, and the comparison unit 208 transmits a wake-up signal to the power control unit 203 of the main processing unit 102. Upon receiving the wake-up signal, the power control unit 203 starts supplying power to the main processing unit 102, and the main processing unit 102 shifts from the power saving state to the normal operation state. On the other hand, if it is determined in S409 that there is no matching identification information, the process returns to S407, and enters the standby state for waiting for the activation packet again. When the process of S410 is completed, the flow of FIG. 4 ends (S411).

  Thus, according to this flow, even when the identification information included in the activation packet received via any one communication interface matches the identification information of the other communication interface, the power saving state of the main processing unit Can be released. In addition, when communication via a communication interface that is in operation (waiting for start-up packet) becomes impossible, it automatically switches to another communication interface, so it receives a start-up packet sent by broadcast. Can increase the probability.

  In the flow of FIG. 4, when the communication interface to be operated is determined, the identification information of the communication interface is stored in the identification information storage unit 214 (S402, S406), but may be stored in advance. .

  FIG. 5 shows a modified example of an operation flowchart performed by the communication processing unit 103. As described above, the information processing apparatus 101 cannot operate the wired interface and the wireless interface at the same time. Accordingly, even when connected to the wired communication device 106 via the connection cable 105, wired communication is not possible during wireless connection with the wireless communication device 109.

  When the main processing unit 102 shifts to the power saving state, the flow of FIG. 5 is started (S501), and the interface control unit 212 stores the identification information of both the wired and wireless interfaces 215 and 216 in the identification information storage unit 214. (S502). Then, the interface control unit 212 confirms whether the active communication interface is the wireless interface 216 (S503). If the wired interface 215 is in use, the process proceeds directly to S505. If the wireless interface 216 is being used, the interface control unit 212 switches to operate the wired interface 215 (S504). Then, it waits for the reception of the activation packet via the wired interface 215 (S505).

  When the activation packet is received from the external communication device via the wired interface 215 (Yes in S505), the packet analysis unit 210 performs the analysis process of the activation packet (S506), and identifies the identification information of the communication interface included in the activation packet. Notify the comparison unit 208. The comparison unit 208 compares the identification information notified from the packet analysis unit 210 with the identification information stored in the identification information storage unit 214, and determines whether there is matching identification information (S507). ). If there is matching identification information as a result of the comparison, the process advances to step S508, and the comparison unit 208 transmits a wake-up signal to the power control unit 203 of the main processing unit 102. Upon receiving the wake-up signal, the power control unit 203 starts supplying power to the main processing unit 102, and the main processing unit 102 shifts from the power saving state to the normal operation state. On the other hand, if it is determined in S507 that there is no matching identification information, the process returns to S507 and again enters a standby state for receiving an activation packet. When the process of S508 is completed, the flow of FIG. 5 ends (S509).

  Since wireless communication consumes more power than wired communication, it is desirable to suppress power consumption as much as possible. According to this flow, if the operation interface when the main processing unit shifts to power saving is a wireless interface, it is switched to the wired interface, so that power consumption can be suppressed. In addition, since the identification information of both the wired and wireless interfaces is stored in the identification information storage unit 214 in advance, even when the activation packet including the identification information of the wireless interface is received via the wired interface, the power saving state Can be restored from.

  In the above embodiment, an example of an information processing apparatus configured not to use a plurality of communication interfaces at the same time has been described. However, the present invention can also be applied to cases where the information processing apparatuses can be used simultaneously. In that case, the communication interface switching process described in S404 in FIG. 4 and S504 in FIG. 5 can be omitted.

  In the above embodiment, the information processing apparatus having both wired and wireless interfaces has been described as an example. However, the present invention can also be applied to a case where there are a plurality of wired or wireless communication interfaces. Further, the number is not particularly limited as long as a plurality of communication interfaces are provided.

  Some information processing apparatuses switch between two operation states of a processing state and a standby state as a normal operation state. The standby state is a state in which a part of power supply to the main processing unit is stopped and a data processing instruction from another device is on standby. When a data processing instruction is received, the processing state is immediately shifted. The processing state is a state in which data processing such as printing is being executed. In the above embodiment, it has been described that when the activation packet is received, the power saving state shifts to the normal operation state. However, the power saving state shifts to the standby state, or the power saving state directly shifts to the processing state. Good.

  As described above, according to the present embodiment, even if an information processing apparatus having a plurality of communication interfaces receives a start-up packet via any communication interface, the power saving state can be shifted to another operation state. .

  The above description has been made by taking an example of a wireless LAN compliant with IEEE 802.11. However, the present invention may be implemented in other wireless media such as wireless USB, Bluetooth (registered trademark), and UWB.

  According to the present invention, a recording medium recording software program codes for realizing the above-described functions is supplied to a system or apparatus, and a computer (CPU, MPU) of the system or apparatus reads and executes the program codes stored in the recording medium. It may be.

201 Main CPU
202 Main memory 203 Power control unit 204 Main bus 205 Local bus 206 Bus bridge processing unit 207 Communication control unit 208 Comparison unit 209 Signal line 210 Packet analysis unit 211 Transmission / reception processing unit 212 Interface control unit 213 Interface monitoring unit 214 Identification information storage unit 215 Wired interface 216 Wireless interface 217 Sub CPU
218 Sub memory

Claims (6)

A communication device,
Storage means for storing identification information of the first interface;
When the identification information of the first interface is included in a predetermined packet received by a second interface different from the first interface, the predetermined processing unit is shifted from the power saving state to another operation state. Transition means for performing processing for
A communication apparatus comprising: A communication device,
A first interface for communicating with other communication devices;
Storage means for storing identification information of the first interface;
When the identification information of the first interface is included in a predetermined packet received by a second interface different from the first interface, the predetermined processing unit is shifted from the power saving state to another operation state. Transition means for performing processing for
A communication apparatus comprising: A communication device,
A second interface for communicating with other communication devices;
Storage means for storing identification information of a first interface different from the second interface;
Transition for performing processing for shifting a predetermined processing unit from a power saving state to another operation state when identification information of the first interface is included in a predetermined packet received by the second interface Means,
A communication apparatus comprising: A communication device,
A first interface for communicating with other communication devices;
A second interface that communicates with another communication device and is different from the first interface;
Storage means for storing identification information of the first interface;
Transition for performing processing for shifting a predetermined processing unit from a power saving state to another operation state when identification information of the first interface is included in a predetermined packet received by the second interface Means,
A communication apparatus comprising: A communication device control method comprising:
Storing identification information of the first interface;
When the identification information of the first interface is included in a predetermined packet received by a second interface different from the first interface, the predetermined processing unit is shifted from the power saving state to another operation state. The control method characterized by performing the process for making it happen.   A program for causing a computer to execute the control method according to claim 5.

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