CN111132099B - Control method and device for Bluetooth master and slave devices and Bluetooth device - Google Patents

Abstract

The invention discloses a bluetooth master and slave device control method, device and bluetooth device. The control method includes the following steps: pre-store the reference bluetooth clock value and the bluetooth address of the slave device in the master device; Before searching, first initialize the master device clock to the reference Bluetooth clock value, and lock the master device clock to remain unchanged; determine the search frequency point according to the master device Bluetooth address and the reference Bluetooth clock value, and in the search Send an inquiry packet to the slave device at the frequency point; try to receive the response packet sent by the slave device at the search frequency point, and when the response packet is received, unlock the clock of the master device to start communicating with the slave device The frequency hopping connection of the slave device is described. The invention has few connection steps, consumes less time, and can quickly enter the connection state.

Description

Method and device for controlling bluetooth master and slave devices, and bluetooth device

technical field

The invention relates to the field of bluetooth communication, in particular to a control method and device for bluetooth master and slave equipment and bluetooth equipment.

Background technique

Before data transmission between classic Bluetooth devices, a reliable wireless connection link needs to be established between the devices. According to the classic Bluetooth protocol specification, Bluetooth devices are divided into Bluetooth master devices (hereinafter referred to as master devices) and Bluetooth slave devices (hereinafter referred to as slave devices). To establish a connection link, for the first connected master device and slave device, Need to go through the following steps: inquiry (inquiry) and query response (response) stage, search stage and connection confirmation stage; for the master device and slave device connected again, need to go through the following steps: search stage and connection confirmation stage.

Inquiry and query response phase (not shown in the accompanying drawings): since the master device does not know which slave devices exist around, the master device first needs to hop frequency at all frequency points to send query packets, and the slave device needs to send query packets at all frequency points. Monitor the lookup table on all frequency points to obtain potential master devices. After the slave device monitors the query packet, it sends the slave device Bluetooth address of the slave device to the master device. This process usually takes a long time.

Search phase: As shown in Figure 1, the master device and the slave device enter the search phase; the master device is paired (paged) with the target slave device (for example, obtained by query), first, the master device determines the slave device Bluetooth address according to the slave device Frequency hopping sequence, and then send ID packets (packages containing the Bluetooth address of the slave device) on different frequency points on the frequency hopping sequence; the slave device performs a pairing scan (page scan), and the slave device determines the frequency hopping sequence according to the Bluetooth address of the slave device, Then open receiving windows at different frequency points on the frequency hopping sequence for scanning (scan). The frequency hopping sequence is determined by the Bluetooth address and the clock value in the Bluetooth clock. The Bluetooth address determines the arrangement order of each frequency point in the frequency hopping sequence, and the clock value in the Bluetooth clock determines the timing of the frequency hopping sequence (the frequency point of the frequency hopping sequence at what point in time). Therefore, in the search phase, since both the master device and the slave device determine the frequency hopping sequence according to the Bluetooth address of the slave device, the order of the frequency points of the frequency hopping sequence is the same, but because the Bluetooth clock value of the master device is different from that of the slave device before the connection The Bluetooth clock value is usually different, so the timing of the two frequency hopping sequences is different, making it difficult for the master device and the slave device to be on the same frequency point at the same time point, so it may take a long time time, the slave device and the master device can be at the same frequency point at the same time (as shown in Figure 1, when the master device CLKN=N and the slave device CLKN=k+1, the master device and the slave device are at the same frequency point f(n) and f(k+1)), and the time period when the master device sends the ID packet is within the time window of the slave device scan (SCAN), the slave device can receive the ID packet; at the next frequency point f( n+1), the slave device returns the ID packet to the master device; after receiving the ID packet, the master device sends a message to the slave device at the frequency point f(n+2) next to Send FHS packet (main bluetooth clock, master device address and other information); after the slave device receives the FHS packet, it will send to the master device at the next frequency point f(n+3) of the frequency point f(n+2). Send ID packet to confirm.

Connection confirmation stage: as shown in Figure 1, the master device and the slave device enter the connection confirmation stage; the master device determines the frequency point of the frequency hopping sequence according to its own master device Bluetooth address and the clock value in the master device clock, and the slave device determines the frequency point of the frequency hopping sequence according to the received Calculate the time point when the master device sends the FHS packet from the time point of the received FHS packet, then calibrate the frequency hopping sequence of the slave device to make it consistent with the timing of the frequency hopping sequence of the master device, and then send a POLL packet query to the air, waiting to receive the slave device The device responds; the slave device determines the frequency point of the frequency hopping sequence according to the Bluetooth address of the master device in the FHS packet information, the Bluetooth address of the master device and the clock value in the Bluetooth clock of the master device, and then receives the POLL packet sent by the master device at this frequency point After that, send a response packet NULL to the master device to notify the master device that it has received the inquiry packet. At this point, the master device and the slave device confirm that the connection is complete;

Connection stage: The master device and the slave device enter the frequency hopping connection state, and data transmission can be performed through this connection link.

In the above-mentioned search phase, the frequency hopping sequence used by the frequency hopping method is long, resulting in a low frequency matching probability between the master device and the slave device; moreover, the frequency hopping time interval used for pairing (page) is large (an average frequency update of 625us ); At the same time, due to the connection parameters (based on the bluetooth address of the slave device and the frequency hopping sequence of the slave device bluetooth clock) and the final connection state parameters (based on the bluetooth address of the master device and the bluetooth The frequency hopping sequence of the clock) is different, resulting in an increase in state switching steps. The above defects will increase the time consumption of establishing a connection, and cannot meet the fast connection requirements in such application scenarios.

Contents of the invention

The invention provides a bluetooth master device, a control method and a device for a slave device, and a bluetooth device, and improves the method used in the search stage in the classic bluetooth standard protocol specification, so as to realize a faster search connection, reduce connection steps, and reduce connection consumption hour.

The present invention provides a control method of a bluetooth master device, which is used to connect the master device with a slave device, comprising the following steps: storing a reference bluetooth clock value and a bluetooth address of a slave device in advance in the master device; Before starting to search, first initialize the master device clock to the reference Bluetooth clock value, and lock the master device clock to remain unchanged; determine the search frequency point according to the master device Bluetooth address and the reference Bluetooth clock value, and in the Send an inquiry packet to the slave device on the search frequency point; try to receive the response packet sent by the slave device on the search frequency point, and after receiving the response packet, unlock the clock of the master device to start communicating with The slave device hops connections.

Preferably, the master device is a master earphone in a pair of Bluetooth earphones, and the slave device is a slave earphone in the pair of Bluetooth earphones.

The invention provides a control method of a bluetooth slave device, which is used to connect the slave device with a master device, comprising the following steps: pre-store a reference bluetooth clock value and a master device bluetooth address in the slave device; Before searching for the master device, initialize the slave device clock to the reference Bluetooth clock value, and lock the slave device clock to remain unchanged; determine the search frequency point according to the master device Bluetooth address and the reference Bluetooth clock value, and Attempt to receive the query packet sent by the master device at the search frequency point; after receiving the query packet, send a response packet to the master device at the search frequency point, and then unlock the clock of the slave device , to start a frequency-hopping connection with the master device.

Preferably, the master device is a master earphone in a pair of Bluetooth earphones, and the slave device is a slave earphone in the pair of Bluetooth earphones.

The invention provides a control device of a Bluetooth master device, which is used to control the connection between the master device and the slave device, comprising: a storage unit for pre-storing the reference Bluetooth clock value and the Bluetooth address of the slave device in the master device; a locking unit , used to initialize the clock of the master device to the reference Bluetooth clock value before the master device starts searching, and lock the clock of the master device to remain unchanged; the sending and receiving unit is used to And the reference Bluetooth clock value determines the search frequency point, and sends an inquiry packet to the slave device on the search frequency point, and tries to receive the response packet sent by the slave device on the search frequency point; frequency hopping The connection unit is configured to unlock the clock of the master device after receiving the response packet, so as to start a frequency hopping connection with the slave device.

Preferably, the master device is a master earphone in a pair of Bluetooth earphones, and the slave device is a slave earphone in the pair of Bluetooth earphones.

The present invention provides a control device for a Bluetooth slave device, which is used to control the connection between the slave device and the master device, comprising: a storage unit for pre-storing the reference Bluetooth clock value and the Bluetooth address of the master device in the slave device; a locking unit , used to initialize the clock of the slave device to the reference bluetooth clock value before the slave device searches for the master device, and lock the clock of the slave device to remain unchanged; the sending unit is used for according to the master device The bluetooth address and the reference bluetooth clock value determine the search frequency point, and try to receive the inquiry packet sent by the master device at the search frequency point; the frequency hopping connection unit is configured to, after receiving the inquiry packet, Send a response packet to the master device at the search frequency point, and then unlock the clock of the slave device to start a frequency hopping connection with the master device.

Preferably, the master device is a master earphone in a pair of Bluetooth earphones, and the slave device is a slave earphone in the pair of Bluetooth earphones.

The invention provides a connection control method between a Bluetooth master device and a slave device, comprising the following steps: pre-store a reference Bluetooth clock value and a slave device Bluetooth address in the master device, pre-store the reference Bluetooth clock value in the slave device, and Master device Bluetooth address; before the master device starts searching, first initialize the master device clock to the reference Bluetooth clock value, and lock the master device clock to remain unchanged; according to the master device Bluetooth address and the reference Bluetooth clock The value determines the search frequency point, and sends an inquiry packet to the slave device on the search frequency point; before the slave device searches the master device, initializes the slave device clock to the reference Bluetooth clock value, and Lock the clock of the slave device to remain unchanged; determine the search frequency point according to the Bluetooth address of the master device and the reference Bluetooth clock value, and try to receive the inquiry packet sent by the master device at the search frequency point; when receiving the After receiving the inquiry packet, send a response packet to the master device at the search frequency point; try to receive the response packet sent by the slave device at the search frequency point, and unlock the The master device clock is used to start the frequency hopping connection between the master device and the slave device.

The present invention provides a bluetooth device, including the control device described in claims 5-8, and also includes a storage medium, the storage medium stores a computer program, and the computer program is executed by a processor as any one of the described methods .

Beneficial effect:

By pre-storing the master device Bluetooth address and Bluetooth reference clock in the slave device, and pre-storing the slave device Bluetooth address and Bluetooth reference clock in the master device, and locking the master device clock and the slave device clock, so that the master device and the slave device start Searching on the same search frequency point, compared with the process of searching for the master device and the slave device in the classic Bluetooth protocol, the connection steps are less, the time-consuming is greatly reduced, and the connection state is quickly entered, which improves the user experience and reduces the power consumption. consumption.

Description of drawings

FIG. 1 is a schematic flowchart of a classic Bluetooth connection method in the prior art.

FIG. 2 is a schematic flowchart of an embodiment of a method for controlling a connection between a Bluetooth master device and a Bluetooth slave device according to the present invention.

Fig. 3 is a flowchart of an embodiment of a method for controlling the connection between a Bluetooth master device and a Bluetooth slave device according to the present invention.

Detailed ways

In order to describe the technical solution of the present invention in more detail and facilitate a further understanding of the present invention, the specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings. However, it should be understood that all the exemplary embodiments and their descriptions are used to explain the present invention, and do not constitute the only limitation to the present invention.

A preset Bluetooth device group includes a Bluetooth master device (hereinafter referred to as the master device) and a Bluetooth slave device (hereinafter referred to as the slave device), that is, the master device and the slave device belong to the Bluetooth device group, and the master device and the slave device The connections between are known and fixed. In one embodiment, the master device and the slave device may be respectively the master earphone and the slave earphone in a pair of Bluetooth earphones.

As shown in FIG. 3 , an embodiment of a method for controlling a connection between a master device and a slave device includes the following steps.

S11. Presetting configuration information in the master device and the slave device

The first configuration information for connecting with the slave device is pre-stored in the master device, and the second configuration information for connecting with the master device is pre-stored in the slave device; wherein, the master device and the slave device belong to a Bluetooth device Group, the first configuration information includes the slave device Bluetooth address and the reference Bluetooth clock value of the slave device; the second configuration information includes the master device Bluetooth address and the reference Bluetooth clock value of the master device.

S12. Initialize the clock of the master device as the reference Bluetooth clock value, fix the clock of the master device, and send an inquiry packet

Before the master device starts to search for the slave device, the master device initializes its own Bluetooth clock (hereinafter referred to as the master clock device) to the reference Bluetooth clock value, and locks the master device clock to remain unchanged; the master device is locked according to the master device Bluetooth address and The master device clock determines the search frequency point, and sends an inquiry packet to the slave device on the search frequency point.

In the classic Bluetooth protocol, the current wireless frequency of the Bluetooth device depends on the Bluetooth address and the Bluetooth clock value in the Bluetooth clock. For a given Bluetooth device, since the Bluetooth address is fixed, the Bluetooth clock value in the Bluetooth clock The constant change of the frequency will lead to the constant change of the wireless frequency point where the Bluetooth device is located, which is the so-called frequency hopping. In the classic Bluetooth protocol, every 625 microseconds, the Bluetooth clock value in the Bluetooth clock increases by 1, so that the Bluetooth clock value keeps changing. In the hardware architecture in Classic Bluetooth, the Bluetooth clock cannot be stopped, or locked. In this solution, in order to lock the Bluetooth clock, certain changes need to be made to the Bluetooth clock. For example, an enable terminal is added to the Bluetooth clock. When an enable signal is output to the control terminal, the Bluetooth clock starts counting (that is, timing); When the locking signal is output to the control terminal, the bluetooth clock is locked and stops counting.

In this solution, before the master device starts to search for the slave device, the master device clock of the master device is initialized to the reference Bluetooth clock value, and then the master device clock is locked, so that the clock value in the master device clock remains unchanged and remains as the reference Bluetooth clock value, so the wireless frequency point obtained by the Bluetooth master device based on the constant Bluetooth clock value (that is, the reference Bluetooth clock value) in the locked master device clock is fixed, that is, the wireless frequency point where the master device is located is fixed, The master device sends an inquiry packet to the slave device on this wireless frequency point to search for the slave device, so this wireless frequency point can be called a search frequency point. The inquiry packet contains the Bluetooth address of the slave device and the Bluetooth address of the master device. The slave device can determine whether the device sending the inquiry packet is the Bluetooth device according to the two addresses of the inquiry packet and the second configuration information stored in advance. The master device of the group. The inquiry packet may adopt an inquiry packet in the classic bluetooth protocol.

As shown in FIG. 2 , the search frequency point of the master device is fixed at f(n*), and continuously sends inquiry packets POLL packets at the search frequency point f(n*).

S13. Initialize the slave device clock as the reference Bluetooth clock value, fix the slave device clock, and try to receive the query packet

Before the slave device searches for the master device, the slave device initializes the slave device clock to the reference Bluetooth clock value, and locks the slave device clock to remain unchanged; the slave device determines the search frequency point according to the master device Bluetooth address and the locked slave device clock, And try to receive the query packet sent by the master device on the search frequency point.

In order to search for the master device in time and receive the inquiry packet sent by the master device, the slave device needs to be at the wireless frequency point where the master device is located, that is, the above-mentioned search frequency point. Since the slave device clock of the slave device is initialized to the reference Bluetooth clock value before searching for the master device, the slave device can obtain the search frequency point according to the reference Bluetooth clock value in the slave device clock, and then at the search frequency point Try to receive the query packet sent by the master device: If the time period for the master device to send the query packet is just within the time window (that is, the scanning window) that the slave device tries to receive, the slave device can successfully receive the query packet; if the master device sends the query packet If the time period of the slave device is outside the time window for the slave device to try to receive, the slave device cannot receive the inquiry packet, so the slave device needs to try to receive the inquiry packet again, or the master device needs to send the inquiry packet again, so that the sending inquiry packet The time period is exactly within the time window the slave device is trying to receive. Because the clock of the slave device is locked, the value in the clock of the slave device remains at the reference Bluetooth clock value, so the slave device is always at the search frequency point at this stage.

As shown in FIG. 2 , the search frequency point of the master device is fixed at f(n*), and continuously tries to receive the inquiry packet POLL packet at the search frequency point f(n*).

S14. After the slave device receives the inquiry packet sent by the Bluetooth master device, the slave device sends a response packet to the master device at the search frequency point, and unlocks the clock of the slave device.

After the slave device determines that the inquiry packet is sent by the master device, it sends a response packet to the master device at the search frequency point to notify the master device that the slave device has received the inquiry packet. The response packet contains the Bluetooth address of the slave device and the Bluetooth address of the master device. The master device can determine whether the device sending the response packet is the Bluetooth device group according to the two addresses of the response packet and the first configuration information stored in advance. group of slave devices. The response packet may adopt the response packet in the classic Bluetooth protocol.

After sending the response packet, the slave device unlocks the slave device clock, and at this time, the slave device clock starts to run based on the reference Bluetooth clock value. Since the clock value in the running slave device clock is constantly changing, the frequency point where the slave device is located is constantly changing, and the slave device starts to enter the frequency hopping state.

As shown in Figure 2, when the slave device receives the query packet POLL packet at the search frequency point f(n*), the slave device sends a response packet NULL packet at the search frequency point f(n*), and unlocks the clock of the slave device, The next frequency point of the slave device clock enters f(n*+1).

S15. The master device tries to receive the response packet sent by the slave device at the search frequency point, and unlocks the clock of the master device after receiving the response packet sent by the slave device.

In order to judge whether the slave device has received the query packet, the master device tries to receive the response packet sent by the slave device on the search frequency point. The response packet can be successfully received; if the time period for the slave device to send the response packet is outside the time window for the master device to try to receive, the master device may not be able to receive the response packet.

The master device can periodically send inquiry packets and try to receive response packets at the search frequency point, and the start time point of sending inquiry packets and the start time point of attempting to receive response packets are set in the position of this time period and fixed, the interval between two time points is fixed, therefore, when the slave device receives the inquiry packet, according to the timer of the slave device when receiving the inquiry packet (in the classic Bluetooth protocol, this timing The device is different from the bluetooth clock, its function includes the time point for synchronizing the transmission and reception between the master device and the slave device and the above-mentioned known fixed interval, that is, it can calculate the start time point of the master device sending the inquiry packet and the slave device's attempt The difference between the start time points of receiving inquiry packets, so that the slave device sends a response packet at the time point when the master device tries to receive the inquiry packet, so as to ensure that the master device can receive the response packet. The slave device can adjust its own timer according to the difference calculated above to synchronize with the timer of the master device, so that in the state of frequency hopping connection between the master device and the slave device, the slave device can receive , the master device can receive when the slave device sends data.

After the master device determines that the response packet is sent by the slave device, the master device clock starts to run on the basis of the reference Bluetooth clock value. As shown in Figure 2, the next frequency point of the master device clock enters f(n*+1 ). Since the clock value in the running master device clock is constantly changing, the frequency point where the master device is located is constantly changing, and the master device starts to enter the frequency hopping state.

S16. The master device starts a frequency hopping connection with the slave device.

Since the Bluetooth address and Bluetooth clock of the wireless frequency point generated by the master device and the slave device are the same, the frequency hopping sequence of the master device (that is, the sequence of wireless frequency points) and the frequency hopping sequence of the slave device are the same; The previous step S5 shows that after the slave device receives the inquiry packet sent by the master device, the slave device can obtain the time difference between the timer of the slave device and the master device through calculation, and the slave device can maintain synchronization with the master device by correcting its own timer , so that the frequency hopping connection communication between the master device and the slave device can be guaranteed.

S17. After the connection between the slave device and the master device is completed, the slave device initializes the slave device clock to the Bluetooth clock value, and locks the slave device clock to remain unchanged, so as to try to receive the next inquiry packet sent by the master device at the search frequency point .

In this embodiment, the master device Bluetooth address and the Bluetooth reference clock are pre-stored in the slave device, and the slave device Bluetooth address and the Bluetooth reference clock are pre-stored in the master device, and the master device clock and the slave device clock are locked, so that the master device The device and the slave device search on the same search frequency point at the beginning. Compared with the process of searching for the master device and the slave device in the classic Bluetooth protocol, the connection steps are fewer, the time-consuming is greatly reduced, and the connection state is quickly entered, which is very good Improve user experience and reduce power consumption.

The present invention also provides a control device for a Bluetooth master device, which is used to control the connection between the master device and the slave device, including:

The storage unit is used to pre-store the reference Bluetooth clock value and the Bluetooth address of the slave device in the master device;

The locking unit is used to initialize the clock of the master device to the reference Bluetooth clock value before the master device starts searching, and lock the clock of the master device to remain unchanged;

A sending and receiving unit, configured to determine a search frequency point according to the Bluetooth address of the master device and the reference Bluetooth clock value, and send an inquiry packet to the slave device at the search frequency point, and at the search frequency point Attempt to receive the response packet sent from the device;

The frequency hopping connection unit is configured to unlock the clock of the master device after receiving the response packet, so as to start the frequency hopping connection with the slave device.

For other steps performed by the control device of the Bluetooth master device, refer to the execution steps of the master device in the foregoing embodiment for details, and details are not repeated here.

The present invention also provides a control device for a Bluetooth slave device, which is used to control the connection between the slave device and the master device, including:

The storage unit is used to pre-store the reference Bluetooth clock value and the Bluetooth address of the master device in the slave device;

A locking unit, configured to initialize the clock of the slave device to the reference Bluetooth clock value before the slave device searches for the master device, and lock the clock of the slave device to remain unchanged;

A sending unit, configured to determine a search frequency point according to the Bluetooth address of the master device and the reference Bluetooth clock value, and try to receive an inquiry packet sent by the master device at the search frequency point;

The frequency hopping connection unit is configured to send a response packet to the master device at the search frequency point after receiving the inquiry packet, and then unlock the clock of the slave device to start a frequency hopping connection with the master device.

For other steps performed by the control device of the Bluetooth slave device, refer to the execution steps of the slave device in the previous embodiment for details, and details are not repeated here.

The present invention also provides a bluetooth device, including a storage medium, the storage medium stores a computer program, and the computer program is executed by a processor to connect a bluetooth master device with a slave device, or a For the method of connecting the Bluetooth master device and the slave device, refer to the execution steps of the master device and the slave device in the previous embodiment for details, and details are not repeated here.

Those skilled in the art can understand that, on the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

It should be understood that the above-mentioned implementations are only exemplary rather than limiting, and those skilled in the art can make various obvious or equivalent solutions to the above-mentioned details without departing from the basic principles of the present invention. Any modification or replacement will be included in the scope of the claims of the present invention.

Claims (13)

1. A control method of a Bluetooth master device is used for connecting the master device with a slave device, and is characterized by comprising the following steps:

pre-storing a reference Bluetooth clock value and a Bluetooth address of a slave device in a master device;

initializing a master device clock to the reference Bluetooth clock value before the master device starts to search, and locking the master device clock to keep unchanged;

determining a searching frequency point according to a master equipment Bluetooth address and the reference Bluetooth clock value, and sending an inquiry packet to the slave equipment on the searching frequency point;

and trying to receive a response packet sent by the slave equipment on the searching frequency point, and unlocking the clock of the master equipment after receiving the response packet so as to start frequency hopping connection with the slave equipment.

2. The control method according to claim 1,

the master device is a master headset of a pair of bluetooth headsets and the slave device is a slave headset of the pair of bluetooth headsets.

3. A control method of a bluetooth slave device for connecting the slave device with a master device, comprising the steps of:

pre-storing a reference Bluetooth clock value and a master Bluetooth address in the slave equipment;

before the slave device searches the master device, initializing a slave device clock to the reference Bluetooth clock value, and locking the slave device clock to keep unchanged;

determining a searching frequency point according to a Bluetooth address of the main equipment and the reference Bluetooth clock value, and trying to receive an inquiry packet sent by the main equipment on the searching frequency point;

and after receiving the inquiry packet, sending a response packet to the master device on the searching frequency point, and unlocking the clock of the slave device to start frequency hopping connection with the master device.

4. The control method according to claim 3,

the master device is a master headset of a pair of bluetooth headsets and the slave device is a slave headset of the pair of bluetooth headsets.

5. A control device of a Bluetooth master device, which is used for controlling the master device to be connected with a slave device, is characterized by comprising:

the storage unit is used for pre-storing a reference Bluetooth clock value and a Bluetooth address of the slave device in the master device;

the locking unit is used for initializing a master device clock to the reference Bluetooth clock value before the master device starts searching, and locking the master device clock to keep unchanged;

a sending and receiving unit, configured to determine a search frequency point according to the master device bluetooth address and the reference bluetooth clock value, send an inquiry packet to the slave device on the search frequency point, and attempt to receive a response packet sent by the slave device on the search frequency point;

and the frequency hopping connection unit is used for unlocking the clock of the master device after receiving the response packet so as to start frequency hopping connection with the slave device.

6. The control apparatus of claim 5,

the master device is a master headset of a pair of bluetooth headsets and the slave device is a slave headset of the pair of bluetooth headsets.

7. A control device of a Bluetooth slave device, which is used for controlling the slave device to be connected with a master device, is characterized by comprising:

the storage unit is used for pre-storing a reference Bluetooth clock value and a master device Bluetooth address in the slave device;

the locking unit is used for initializing a slave device clock to the reference Bluetooth clock value before the slave device searches the master device, and locking the slave device clock to keep unchanged;

the transmitting unit is used for determining a searching frequency point according to the master equipment Bluetooth address and the reference Bluetooth clock value and trying to receive an inquiry packet transmitted by the master equipment on the searching frequency point;

and the frequency hopping connection unit is used for sending a response packet to the master equipment on the searching frequency point after receiving the inquiry packet, and unlocking the clock of the slave equipment to start frequency hopping connection with the master equipment.

8. The control device of claim 7,

the master device is a master headset in a pair of bluetooth headsets and the slave device is a slave headset in the pair of bluetooth headsets.

9. A connection control method of a Bluetooth master device and a Bluetooth slave device is characterized by comprising the following steps:

pre-storing a reference Bluetooth clock value and a slave equipment Bluetooth address in the master equipment, and pre-storing the reference Bluetooth clock value and the master equipment Bluetooth address in the slave equipment;

initializing a master device clock to the reference Bluetooth clock value before the master device starts to search, and locking the master device clock to keep unchanged;

determining a searching frequency point according to a master equipment Bluetooth address and the reference Bluetooth clock value, and sending an inquiry packet to the slave equipment on the searching frequency point;

initializing a slave device clock to the reference Bluetooth clock value before the slave device searches the master device, and locking the slave device clock to keep unchanged;

determining a searching frequency point according to a Bluetooth address of the main equipment and the reference Bluetooth clock value, and trying to receive an inquiry packet sent by the main equipment on the searching frequency point;

after receiving the inquiry packet, sending a response packet to the master device on the search frequency point, and then unlocking the clock of the slave device;

and trying to receive a response packet sent by the slave equipment on the searching frequency point, and unlocking the clock of the master equipment after receiving the response packet so as to start frequency hopping connection between the master equipment and the slave equipment.

10. A Bluetooth device comprising the control apparatus of claim 5 or 6.

11. A bluetooth device comprising the control apparatus of claim 7 or 8.

12. A bluetooth device comprising a storage medium having stored thereon a computer program for execution by a processor as the method of claim 1 or 2.

13. A Bluetooth device comprising a storage medium having stored thereon a computer program for execution by a processor to perform the method of claim 3 or 4.

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