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Design and Implementation of Multifunctional Chip Driver

Author: HuangXiaoFeng
Tutor: YangFuMin
School: Huazhong University of Science and Technology
Course: Applied Computer Technology
Keywords: Audio codec 97 specification Drive Audio codec Direct Memory Access Analog-to-Digital Converter
CLC: TP331
Type: Master's thesis
Year: 2004
Downloads: 158
Quote: 1
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Abstract

Traditional embedded devices in chip features a single , multi-chip must work together to perform multiple functions . Complete functionally equivalent conditions , if a chip is able to achieve a variety of functions , in the embedded device can use fewer chips , so as to achieve size reduction and the purpose of reducing costs . An audio codec 97 specification , and also has a variety of keyboard , touch screen and battery monitoring function of a chip analysis using embedded Linux , a variety of mechanisms to achieve the entire drive management module . In order to be able to coordinate and to play a variety of functions of the chip , a reasonable division of the functional modules directly affect the quality of the entire module . By analysis of the key technologies in the Linux driver , such as interrupt handling process , competitive conditions , and based on the the chip unique features of the various parts of the management module is analyzed and divided , and given the need to achieve the goals of the individual modules . The main task of the two core modules driven management : operating audio codec interrupt control unit as well as the audio codec digital interface , and distribution of the upper module . First use of technologies such as mutual exclusion mechanism and core thread two core modules , the final solution for saving part of the problem . The audio portion of the main functions of the multi-function chip audio codec digital interface protocol specification analysis based on the use of direct memory access , interrupts , and direct memory access , buffer management technology , design and realization of the audio driver and given the audio portion of the energy-saving management . Chip common input and output ports constitute the keyboard hardware base . Support the length of the key of the keyboard driver time requirements vary with the ordinary keyboard driver , timing analysis , keyboard management module is designed and implemented using the synchronization mechanism . A touch screen and a battery monitoring both modules to obtain the respective digital data using the chip analog to digital conversion function , their common hardware basis of a ten-bit analog - to - digital converter of the chip's internal , on the basis of the analysis of the cell , specific analysis synchronizing signal, to eliminate interference and uses the interrupt and polling are two methods to achieve a touch screen driver , and finally gives the battery monitoring interface .

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