Key Driving Implementation Technology Of Smart Campus Card

With the development of sensor,communication,computer technology.Embedded technology has wide application fields.Relying on Internet of things technology has been developed.Smart campus using Internet of things technology has attracted more and more attention.The purpose of smart campus is to improve teaching effect by using information technology.In the smart campus,the smart campus card can realize information sending and receiving and classroom interaction.Manufacturing smart campus card can assist teachers in teaching and improve classroom efficiency.Smart campus card software system is divided into application layer,support layer and drive layer.Focus on research and implementation of key drivers.The software development platform uses Keil to build the project,JLINK is used to download the code into the development board for debugging.Understanding the principle of hardware,we can choose the communication protocol,build the data transmission channel,and then complete key driver of smart campus card.Firstly,the hardware composition and software system of smart campus card is introduced,and the driving development framework is designed.Secondly,the driver of the display screen is completed.The display supports SPI bus.SPI initialization and chip display setting are completed during driver initialization.The interface for transmitting command and data and transmission interface of the display data are implemented.In addition,the power management strategy is also designed.Through these settings,the display buffer area is setted,and the black and white display function is specified,so that the display can display the teaching content.Finally,the driver of the acceleration sensor module is completed.Through compiling read-write interface,reading and writing the value of register,setting chip address and working mode,the initialization of the chip can be completed.And the interface to obtain the triaxial acceleration value is provided.In order to avoid the error,a compensation strategy under extreme temperature is designed.Finally,the chip provides accurate acceleration value for the upper layer.