to the correct use of enumeration

Synchronize data in the production, transmission and processing is continuous and real-time, in a stable rate of data sent and received simultaneously contains corresponding clock information, in order to maintain the timing relationships must be received synchronous data transfer rate. All transfers are started by the host, the firmware designed to completely interrupt-driven, when the CPU processing the foreground task, USB transfer can be in the background. This ensures the best transmission rate and better software structure. USB host system firmware write more complicated, mainly related to the USB control transfer, USB bulk transfer, mass storage class protocol, UFI disk operating commands and write FAT file system, all the bottom of the program operation, there is no ready-made library support. The effective tool of laser pointer is convenient in use and outstanding in quality.
Therefore, the overall framework of the program and specific agreements to build the organizational structure of data is critical. The main difficulty lies in the modular design of software programs written in the agreement because it involves more than, in the preparation process should pay attention to the modular idea, as each specific agreements are written in a source file, the data structures and constants, variables, most well defined in the header file for each module. USB low-level debugging of control transfer, Bus Hound can take full advantage of USB removable storage tools just crawl into your computer to communicate with the computer data analysis, comparison and reference developed to enhance information exchange on the USB understanding of the underlying. Any USB device connected to the USB host, USB-host must be configured to the correct use of enumeration. USB bus enumeration procedures and methods, for all USB devices are the same, and must comply with the standard USB protocol process, by controlling the transmission of "a question and answer" to achieve the necessary master and slave data exchange a few. The useful tool of laser pointer is fabulous in appearance.