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SPI has earned a solid role in embedded systems whether it is system on chip processors, both with higher end 32-bit processors such as those using ARM, MIC  or Power PC and with other microcontrollers such as the AVR, PIC etc. These chips usually include SPI controllers capable of running in either master or slave mode. In-system programmable AVR controllers can be programmed using an SPI interface.Chip or FPGA based designs sometimes use SPI to communicate. So, SPI is a common technology used nowadays for communication with peripheral devices where we want to transfer data speedily and with in real time constraints. There are many serial interfaces right from Morse code telegraphy, RS232, USB, Fire wire, Ethernet and many more. Each serial interface offers advantages or disadvantages for many designs,depending on criteria such as needed data rate, space availability, and noise considerations

Handheld devices like a cell phone, palmtop and laptop were rapidly becoming an integral part of our daily lives. In most cases, these devices do Bluetooth Basics not have compatible data communication interfaces, or, if they do, the interface requires cumbersome cable connections and configuration procedures. Isn’t it absolutely fantastic to connect your PC to share music, data and calendar info without using any wires? Or to wirelessly access phone numbers on your PDA from your cell phone. Driving without holding the handset makes it dramatically safer and easier. Accessing the internet, print files from your computer and print photos taken from a digital camera without a single piece of wire lying in your office.

 An obvious solution was to get rid of the cables and use short-range, wireless, inexpensive and universally adopted by device vendors to facilitate on-demand connectivity among devices .The marvel of engineering gave us the freedom of exchanging data without using yards of wires and popularly known as Bluetooth.  

Bluetooth is defined as layered protocol architecture because each layer supports the layer above and below it.  The complete protocol stack consists of Bluetooth Protocol Stack both Bluetooth specific protocols which are clearly defined or developed for Bluetooth like LMP and non-Bluetooth specific that were designed to enable the re-use of existing protocols for various functions. Non-specific protocols can be used with many other platforms like WAP, UDP AND OBEX. These were used to speed up the development of Bluetooth protocol at higher layers at the same time adaptation to work with Bluetooth devices and ensure interoperability.  Bluetooth protocol comprises of a number of protocols which can be divided into four categories: telephony control protocol, cable replacement protocol, adopted protocol, telephony control protocol. Each of these protocols is responsible for specific type of task and stands on its own. The concept of master, slaves, Pico nets and scatter net forming ad-hoc network. This part of Bluetooth will deal with the protocols responsible for the working of Bluetooth technology.

 
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