本文選題：嵌入式系統(tǒng) + 實(shí)時(shí)時(shí)鐘��； 參考：《華中科技大學(xué)》2008年碩士論文

【摘要】： 隨著計(jì)算機(jī)技術(shù)的發(fā)展,特別是多媒體技術(shù)的快速發(fā)展,多媒體廣告機(jī)作為一種全新的廣告形式逐漸滲透到人們生活的各個(gè)方面,并在廣告市場中占據(jù)越來越重要的位置。為此,采用ARM+DSP雙處理器平臺和開源的嵌入式Linux操作系統(tǒng)自行開發(fā)了一套嵌入式多媒體廣告機(jī)系統(tǒng)。 多媒體廣告機(jī)系統(tǒng)采用PCF8563作為實(shí)時(shí)時(shí)鐘芯片,系統(tǒng)可以在I2C協(xié)議控制下訪問其寄存器。由于ARM處理器EP9315并沒有提供I2C接口,因此采用GPIO針腳來模擬I2C總線的數(shù)據(jù)線和時(shí)鐘線,以軟件方式模擬I2C協(xié)議,實(shí)現(xiàn)I2C總線驅(qū)動,為系統(tǒng)提供訪問時(shí)鐘芯片的接口。在此基礎(chǔ)上設(shè)計(jì)和實(shí)現(xiàn)了實(shí)時(shí)時(shí)鐘驅(qū)動,為應(yīng)用程序提供了設(shè)置和獲取系統(tǒng)時(shí)間的接口,并利用PCF8563的報(bào)警功能以及能夠輸出中斷的特性,設(shè)計(jì)和實(shí)現(xiàn)了整點(diǎn)報(bào)時(shí)功能。 設(shè)計(jì)了音頻模塊,完成音頻數(shù)據(jù)在系統(tǒng)中的傳輸,并為應(yīng)用程序提供控制聲音播放的接口。系統(tǒng)采用ARM+DSP雙處理器的架構(gòu),音頻數(shù)據(jù)存儲在ARM外接的磁盤上,而數(shù)據(jù)的解碼卻由DSP來處理,所以必須實(shí)現(xiàn)雙核之間的數(shù)據(jù)通信。DSP的HPI(Host Port Interface)主機(jī)接口為外部CPU提供了訪問DSP內(nèi)存的方式。利用HPI驅(qū)動以共享緩沖區(qū)的方式將從ARM磁盤讀出的數(shù)據(jù)發(fā)送給DSP的解碼單元,經(jīng)過解碼處理后依次發(fā)往8個(gè)緩沖區(qū),然后以DMA鏈方式發(fā)送給McASP(Multi-channel Audio Serial Port)的發(fā)送緩沖區(qū),在位時(shí)鐘和幀同步時(shí)鐘控制下以I2S格式串行發(fā)送給UDA1345TS進(jìn)行數(shù)模轉(zhuǎn)換。ARM通過GPIO針腳模擬L3總線來控制UDA1345TS,調(diào)節(jié)音量大小,設(shè)置靜音模式,初始化系統(tǒng)時(shí)鐘頻率和輸入數(shù)據(jù)格式等。
[Abstract]:With the development of computer technology, especially the rapid development of multimedia technology, multimedia advertising machine as a new form of advertising gradually infiltrates into all aspects of people's lives, and occupies an increasingly important position in the advertising market. Therefore, an embedded multimedia advertisement machine system is developed by using arm DSP dual processor platform and open source embedded Linux operating system. PCF8563 is used as the real time clock chip in the multimedia advertisement machine system. The system can access the register under the control of I2C protocol. Since arm processor EP9315 does not provide I2C interface, GPIO pin is used to simulate the data line and clock line of I2C bus, and the I2C protocol is simulated by software to realize I2C bus driver, and the interface to access the clock chip is provided for the system. On this basis, the real-time clock driver is designed and implemented, which provides an interface for the application program to set and obtain the system time, and uses the alarm function of PCF8563 and the characteristic of outputting interruption to design and implement the point time reporting function. The audio module is designed to complete the transmission of audio data in the system and provide the interface for the application program to control the sound playing. The system adopts arm DSP dual-processor architecture, audio data is stored on arm external disk, while data decoding is processed by DSP. So it is necessary to realize the data communication between dual cores. The HPII-Host Port Interface (HPIPort Interface) interface of DSP provides a way for external CPU to access DSP memory. The data read out from arm disk is sent to the decoding unit of DSP by using HPI driver in the form of shared buffer. After decoding, the data is sent to 8 buffers in turn, and then sent to the sending buffer of McASPU Multi-channel Audio serial port by DMA chain mode. Under the control of bit clock and frame synchronous clock, the UDA1345TS is sent to UDA1345TS serially with I2S format. Arm controls UDA1345TSthrough GPIO pin analog L3 bus, adjusts volume, sets mute mode, initializes system clock frequency and input data format and so on.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2008
【分類號】：TN919.82

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前5條

1 胡暉;DaVinci多媒體通信終端關(guān)鍵技術(shù)研究[D];北京郵電大學(xué);2011年

2 吳正良;基于嵌入式Linux的廣告機(jī)終端的設(shè)計(jì)與實(shí)現(xiàn)[D];安徽理工大學(xué);2011年

3 梅良剛;基于DLGUI的移動智能廣告終端及廣告發(fā)布平臺[D];安徽理工大學(xué);2011年

4 張戰(zhàn)天;多媒體廣告自助發(fā)布系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)[D];上海交通大學(xué);2011年

5 王晗;基于嵌入式Linux的光動力治療腫瘤控制系統(tǒng)設(shè)計(jì)[D];齊齊哈爾大學(xué);2013年

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本文編號：2031924