Introduction
Bluetooth chip technology is a short-range wireless communication technology. The use of Bluetooth technology can effectively simplify the communication between mobile communication terminal devices such as handheld computers, notebook computers and mobile phones. It can also successfully simplify the communication between these devices and the Internet. The communication between networks makes the data transmission between these modern communication devices and the Internet more rapid and efficient and broadens the way for wireless communication.
Master-slave relationship
Bluetooth chip technology stipulates that when each pair of devices performs Bluetooth communication, one must be the master and the other must be the slave, so that communication can be carried out. During communication, the master must find out, initiate pairing and establish a link After that, both parties can send and receive data. In theory, a Bluetooth master device can communicate with 7 Bluetooth slave devices at the same time. A device with Bluetooth communication function can switch between the two roles. It usually works in slave mode and waits for other master devices to connect. When necessary, it switches to master mode and initiates calls to other devices. When a Bluetooth device initiates a call in the master mode, it needs to know the other party's Bluetooth address, pairing password and other information, and the call can be initiated directly after the pairing is completed.
Call process When the
Bluetooth master device initiates a call, the first step is to find and find out the Bluetooth devices around which can be found. After the master device finds the slave Bluetooth device, it will pair with the slave Bluetooth device. At this time, the PIN code of the slave device needs to be entered, and some devices do not need to enter the PIN code. After the pairing is completed, the slave Bluetooth device will record the trust information of the master device. At this time, the master can initiate a call to the slave device, and the paired device does not need to be paired again during the next call. A paired device, as a slave Bluetooth headset, can also initiate a link establishment request, but the Bluetooth module for data communication generally does not initiate a call. After the link is established successfully, two-way data or voice communication can be carried out between the master and slave ends. Both the master and slave devices in the communication state can initiate link disconnection and disconnect the Bluetooth link.
Data transmission In the
data transmission application of Bluetooth chip, one-to-one serial data communication is one of the most common applications. The pairing information between the two Bluetooth devices is set in advance for the Bluetooth device before leaving the factory. The master has pre-stored the slave device PIN code, address, etc., the device at both ends will automatically establish a link when power on, transparent serial port transmission, without the intervention of peripheral circuits. In one-to-one applications, the slave device can be set to two types. One is the silent state, that is, it can only communicate with the designated master and cannot be searched by other Bluetooth devices; the second is the development state, which can be searched by the designated master. It can also be found and established by other Bluetooth devices.
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