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As a universal bus technology at present,I2C Bus has been widely used in the interface between CPU and other devices such as EEPROM and RTC.VxWorks is an embedded operation system designed by Wind River Inc.and used in embedded fields frequently.This paper focuses on the structure of I2C driver and analyzes the operation mechanism of I2C driver.In addition,the flow of developing an I2C device driver is illustrated in this paper by taking an RTC chip named RX8025 as a specific example.