描述
由于電視及顯示器的幀頻或刷新率一般在l00Hz以內(nèi),因此系統(tǒng)的總體設(shè)計(jì)目標(biāo)是可以進(jìn)行3路并行10kHz取樣率、12位精度以上的實(shí)時(shí)彩色分析,如此的數(shù)據(jù)量采用傳統(tǒng)的RS232串口(通常幾十Kb/s)以及IEEE488(GPIB,通常幾Mb/s)接口都不能保證實(shí)時(shí)性,必須采用更高帶寬的探測器與虛擬儀器主機(jī)系統(tǒng)互連方案。一種當(dāng)前普遍采用的方案是基于ISA/PcI接口的插卡式A/D,但模擬信號需要從現(xiàn)場到主機(jī)進(jìn)行傳輸,距離受到很大限制。電視或顯示器工廠需要生產(chǎn)線在線彩色分析系統(tǒng),要求具有可擴(kuò)展、可管理、遠(yuǎn)程、多探測系統(tǒng)并行工作等能力,因此采用了TCP/IP協(xié)議以及100M以太網(wǎng)的傳輸方案,以滿足以上需求,但缺點(diǎn)是比較復(fù)雜。虛擬儀器概念的核心應(yīng)該不僅僅局限于軟件,而是擴(kuò)展到更廣義的資源共享。美國的NI公司提出“軟件就是儀器”,在本文中,提出“資源共享就是虛擬儀器”,并把這種思想應(yīng)用到彩色分析虛擬儀器的系統(tǒng)互連設(shè)計(jì)上。具體而言,將比較復(fù)雜的TCP/IP協(xié)議以及100M以太網(wǎng)傳輸部分用通用的通信系統(tǒng)板來實(shí)現(xiàn),具體采用的是目前比較成熟的ARM7TDMI內(nèi)核的韓國三星4510B通信系統(tǒng)板,未來的工業(yè)級應(yīng)用可以考慮移植到Atmel公司的系統(tǒng)上。這種深入到數(shù)據(jù)傳輸層面虛擬儀器方案的實(shí)現(xiàn)難點(diǎn)在于,數(shù)據(jù)采集系統(tǒng)與通用通信系統(tǒng)板的互連,筆者采用FPGA來完成接口轉(zhuǎn)換。采集到的數(shù)據(jù)封裝成TCP/IP包的過程由嵌入在通信系統(tǒng)板上的VxWorks實(shí)時(shí)操作系統(tǒng)實(shí)現(xiàn)。
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