Design for card reader's data acquisition system based on USBHID and SQLite of WINCE

With the development of society, embedded products have been applied in all walks of life. According to the investigation of most embedded Windows CE data acquisition system, data transmission and storage management are not very good. In this paper we show how the USB interface and SQLite can be used to solve these problems. Using USB bus for data transfer, we can realize HID devices loaded dynamically and avoid writing redundant complicated USB drive. Using embedded database SQLite for data storage, the storage structure is more clear and easier to be managed. But Nandflash is limited to the number of reading and writing, so we put forward "two levels storage" concept of data storage structure based on the WinCE file system. Practice has shown that the USB and SQLite technology can be better to solve the data transfer and storage management issues.