CSR is the short name of a chip manufacturer in the United Kingdom, and the CSR on the blue adapter means that the adapter uses the chip of a CSR manufacturer, which is also the name of a manufacturer's code name. Bluetooth module is a PCBA board with integrated Bluetooth function for short-range wireless communication, which is divided into Bluetooth data module (such as BLK-MD-BC04-B, BLK-MD-SPP series) and Bluetooth voice module (such as BLK-MD-SPK series) according to function. The general module has the properties of semi-finished products, which are processed on the basis of the chip to make subsequent applications simpler. The common Bluetooth adapter (also known as dongle) is usbdongle, which is mainly used for transmitting data, and there are also serial dongle; For special users, there are voice dongle, etc.; Bluetooth module according to the protocol is divided into support 1.1, 1.2, 2.0, 3.0, 4.0 modules usually the latter compatible with the former products. As a short-range wireless communication technology to replace data cables, Bluetooth supports point-to-point and point-to-multipoint communication, and wirelessly connects various data and voice devices in the home or office into a Pico-net. Several pico-nets can also be further interconnected to form a distributed network. This enables fast and convenient communication between these connected devices. This paper introduces the implementation of Bluetooth interface on embedded digital signal processor OMAP5910. DSP samples the analog signal, processes the digital signal after A\/D transformation, and transmits it to the receiving end through Bluetooth interface. Similarly, DSP transforms the digital signal received by Bluetooth to D\/A and becomes an analog signal. The interface of Bluetooth module is divided into serial interface, USB interface, digital IO port, analog IO port, SPI programming port and voice interface. When only data transmission is required, the system architecture should try to use a serial interface (TTL level), so that the modules on the market can be supported, such as the need for IO port, you need to develop Bluetooth software as needed, time costs and economic costs are relatively high. It should be noted that the current Bluetooth module data transmission and voice transmission on the market are different models of modules, the chip is different, if the data voice to be realized at the same time, may only Kaichun KC series Bluetooth module can be realized. Bluetooth module is generally composed of chip, PCB board, peripheral devices. For example, the BLK-MD-BC04-B Bluetooth module has a CSRBC4 Bluetooth chip, MX Flash is welded on the 4-layer PCB board, and the PCB board integrates 2.4G printed board antenna, and the printed board antenna is cost-effective. Some modules will have RF amplifiers, such as the BLK-MD-BC04-L remote Bluetooth module. Different Bluetooth modules due to the different role and application, the external pin of the module will be different.