信號(hào)發(fā)生器課程設(shè)計(jì)論文-文庫(kù)吧資料
2025-06-25 01:28本頁(yè)面
【正文】 TE[0X0FFF]int code table2[]={100,102,104,107,109,112,114,117,119,121,124,126,129,131,133,135,138,140,142,144,147,149,151,153,155,157,159,161,163,165,167,168,170,172,174,175,177,178,180,181,183,184,185,187,188,189,190,191,192,193,194,194,195,196,197,197,198,198,198,199,199,199,199,199,200,199,199,199,199,199,198,198,198,197,197,196,195,194,194,193,192,191,190,189,188,187,185,184,183,181,180,178,177,175,174,172,170,168,167,165,163,161,159,157,155,153,151,149,147,144,142,140,138,135,133,131,129,126,124,121,119,117,114,112,109,107,104,102,100,97,95,92,90,87,85,82,80,78,75,73,70,68,66,64,61,59,57,55,52,50,48,46,44,42,40,38,36,34,32,31,29,27,25,24,22,21,19,18,16,15,14,12,11,10,9,8,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,8,9,10,11,12,14,15,16,18,19,21,22,24,25,27,29,31,32,34,36,38,40,42,44,46,48,50,52,55,57,59,61,64,66,68,70,73,75,78,80,82,85,87,90,92,95,97,100}。HZ250HZ=80。j=j+1。中斷流程圖如圖10所示。延時(shí)i=i+1。開始i=0。正弦波波形設(shè)計(jì)通過(guò)查表指令得到。延時(shí)i0i=i1。i255i=255。DAC0832=i。YNYN圖7 階梯波程序流程圖 三角波程序流程圖三角波程序流程圖如圖7所示，將0255先送給DAC0832，然后在反過(guò)來(lái)將2550送給DAC0832，從而可產(chǎn)生三角波。DAC0832=i。延時(shí)延時(shí)YNYN圖6 方波產(chǎn)生流程圖 階梯波產(chǎn)生流程圖通過(guò)對(duì)脈寬的調(diào)制，我們可以設(shè)計(jì)階梯波的流程圖，如圖7所示。開始DAC0832=0。正弦波波形設(shè)計(jì)通過(guò)查表指令得到。程序開始執(zhí)行，中斷初始化，調(diào)用顯示函數(shù)，判斷K值，K=0時(shí)，輸出低電平，K=1時(shí)為方波輸出；K=2時(shí)為鋸齒波輸出；K=3時(shí)為三角波輸出；K=4時(shí)為正弦波輸出，通過(guò)連續(xù)按鍵，可以依次在這四個(gè)波形之間切換[8]。圖3 信號(hào)發(fā)生器總電路圖 頻率數(shù)碼顯示電路頻率指示電路如圖4所示，本系統(tǒng)的頻率顯
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