郭萬有DSP實(shí)驗(yàn)2

1、實(shí)驗(yàn)二實(shí)驗(yàn)?zāi)康?了解DMA通信基本原理，掌握內(nèi)存與SDRAM間一維DMA通信方式、二維DMA通信方式以及相關(guān)控制方法。學(xué)習(xí)數(shù)字濾波器設(shè)計(jì)方法，掌握其調(diào)試步驟，使學(xué)生加深對IIR的理解，進(jìn)一步提高對數(shù)字信號處理理論的認(rèn)識。實(shí)驗(yàn)任務(wù)：123險險險內(nèi)存與SDRAM間的一維DMA通侶頭驗(yàn)內(nèi)存與SDRAM間的二維DMA通信實(shí)驗(yàn)無限脈沖響應(yīng)數(shù)字濾波器（IIR）的設(shè)計(jì)實(shí)驗(yàn)實(shí)驗(yàn)內(nèi)容：4-實(shí)驗(yàn)1內(nèi)存與SDRAM間的一維DMA通信實(shí)驗(yàn)實(shí)驗(yàn)原理DMA是一種不需要處理器內(nèi)核干預(yù)的數(shù)據(jù)傳輸機(jī)制，作為一種后臺任務(wù)執(zhí)行，即進(jìn)行DMA傳輸時，處理器可以處理其它任務(wù)。如果使能了DMA中斷，那么當(dāng)數(shù)據(jù)傳輸結(jié)束后會產(chǎn)生中斷信號，表

2、示DMA傳輸已經(jīng)完成。DMA傳輸方式包括：一維DMA、二維DMA、鏈?zhǔn)紻MA、AutoDMA等，本次實(shí)驗(yàn)使用一維DMA方式，即傳輸存儲器中一段連續(xù)的數(shù)據(jù)（地址是相鄰接的）。若要利用DMA傳輸數(shù)據(jù)，首先應(yīng)配置DMA傳輸控制塊（TCB）寄存器。DMA傳輸?shù)臄?shù)據(jù)具有方向性，即從發(fā)送端（源）到接受端（目的），若為外部存儲器DMA傳輸，則需要設(shè)置兩個TCB參數(shù)，一個源TCB,用于描述源數(shù)據(jù)的地址、大小和每次傳輸數(shù)據(jù)的長度等；還有一個目的TCB,用于描述數(shù)據(jù)傳入的目標(biāo)地址、數(shù)據(jù)大小及每次傳輸數(shù)據(jù)的長度等。若要使能DMA中斷，也需要在TCB中設(shè)置相應(yīng)位。若使用鏈路或AutoDMA通道則只需一個目的TCBo設(shè)

3、置好TCB寄存器后，DMA傳輸自動開始。TS201S一共14個DMA通道，4個通道（03）專用于外部存儲器設(shè)備，8個通道（411）用于鏈路口，2個通道（12T3）用于自動DMA操作。本次實(shí)驗(yàn)使用DMA0通道實(shí)現(xiàn)內(nèi)存與外部存儲器SDRAM間的一維DMA通信。相關(guān)的寄存器：1）TCB寄存器TCB寄存器是一個128位的四字組寄存器，由DI、DX、DY和DP寄存器組成：a）DI是DMA索引寄存器，包括了將要發(fā)送或者接收的數(shù)據(jù)的源地址或者目的地址，既可以指向內(nèi)部存儲器乂可以指向外部存儲器，也可指向鏈路口b）DX包含了一個16位（高）的計(jì)數(shù)值和一個16位的修改量，若使能了二維DMA則該寄存器保存的只是X方

4、向的計(jì)數(shù)值和修改量c）DY與DX結(jié)合一起使用，保存了Y方向上的16位計(jì)數(shù)值和16位修改量。如果只進(jìn)行一維DMA傳輸，就不需要設(shè)置該寄存器。d）DP寄存器包括了DMA所有控制信息，分為兩個主要段312221044鏈?zhǔn)街羔?amp;鏈標(biāo)記（用于鏈?zhǔn)紻MA）對DP寄存器各位功能說明:位說明位說明0T4四字地址（TCB指針2526操作數(shù)據(jù)長度:01=32位，10=64位，11=128位1516鏈指針選擇存儲單元1721鏈目的通道27二維DMA使能22使能鏈?zhǔn)紻MA28DMA請求優(yōu)先級，0=正常優(yōu)先級，1=高優(yōu)先級23DMA請求使能24DMA中斷使能2931指定DMA設(shè)備類型2中斷屏蔽寄存器（IMASK

5、）IMASK是一個64位寄存器，由IMASKH和IMASKL組成，當(dāng)IMASK中某位被設(shè)置成1的時，那么將響應(yīng)這個位所對應(yīng)的中斷。DMAO中斷對應(yīng)在IMASKL中的第14位，所以我們要取消對DMAO中斷的屏蔽,使能DMAO中斷，可以通過如下指令實(shí)現(xiàn)：xr0=0x4000;/*0x4000=B0100000000000000*/IMASKL=xrO;xrO=O;IMASKH=O也可以直接使用如下指令實(shí)現(xiàn)，原理是一樣的，下面的方法更為直觀一些。xrO=INT_DMAO;/*INT_DMAO在頭文件中的定義的值為0x4000*/IMASKL=xrO;實(shí)驗(yàn)步驟：1）啟動VisualDSP+,新建工程命

6、名為"test2_l；路徑選擇為D:DSP，并將源代碼文件夾下默認(rèn)生成的test2_l.c文件移除；2）新建空白文件（選擇菜iFileNewFile）,輸入?yún)⒖荚创a，保存為DMA_l.asm,并將其添加到工程中；3）斥析、理解源程序，并編譯文件糾錯；4）建立鏈接文件（選擇菜單lools->ExpertLinker-CreateLDF）4）編譯整個工程，若出現(xiàn)錯誤"Thefollowingsymbolsreferencedinprocessor'pO1couldnotberesolved:'main_main'referencedfrom

7、9;ts_hdr_TS201.doj'”則說明聲明的程序段/數(shù)據(jù)段（變量）所存放到了不能被執(zhí)行的立香，導(dǎo)致該程序段/數(shù)據(jù)段（變量）沒有被分配到相應(yīng)的存儲空間。處理方式：打開生成的LDF鏈接文件，在打開的ExpertLinker窗口中將紅義項(xiàng)下的DMAl.obj添加（用鼠標(biāo)拖拽）到MSSD0存儲區(qū)（由于TS201S將外部存儲器SDRAM地址映射到了0x40000000到0x7FFFFFFF之間的四個部分：MSSD03,所以我們將DMAl.obj添加至其中之一即可，由于開發(fā)板上SDRAM是映射在MSSD0,為方便以后實(shí)驗(yàn)，直接添加至MSSD0即可）。5）重新編譯工程，為方便觀察存儲器內(nèi)相應(yīng)

8、地址其內(nèi)容變化，在_Done處設(shè)置斷點(diǎn)，同時打開兩個存儲器觀察窗口（選擇菜單Memory->TigerSHARCMemory）分別輸入tx_data和rx_datao6）運(yùn)行（RUN）工程，程序自動運(yùn)行至_Done后停止，觀察tx_data內(nèi)數(shù)據(jù)值,然后單步運(yùn)行程序（按鍵），觀察rx_data內(nèi)數(shù)據(jù)變化。實(shí)驗(yàn)結(jié)果：1未修改時的實(shí)驗(yàn)結(jié)果:40000000(4000000)(4000000AJ4000000FJ0000014a0000019aOOOOOLE(40000023)40000028)(4QOOOOZDJ4000003?40000037(Q000003C)(40000041)4000

9、004bXK_dta0000000300000006OOOOOOOB000000100000001500Q003&ooooaoiF00000024oooooaoooooooooooooooooooooooooooooooooooooooooooooooooo0000000200000007oooooooc00000011000000160000001B00000020oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo0000000300000008OOOOOOOD0000001200000017OOOOOOI

10、C00000021oooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo0000000400000009OQOOOOOE00000013000000180000001D00000022ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooOOOOOQOSOOOOOOOiOOOOOOOF0000Q0H000000190000001E00000023oooooooooooooooooooooooooooooooo60000000oooooooooooo

11、oooooooooooo1000001100005lOOOOJk1100D0F100014110001$10001E1100023100020100D2D1100032110003710003C11000411000U(10004B0000000100000006OOOOOOOB000000100000001500000012.OOOOOOiF0000002400000029OOOOQD2E00000033000000330000003D000000420000004?0000004C00000002ooooooo?oooooooc0000001100000016OOOOOO1B0000002

12、00000002S0000002AOOOOO2F000000340000003$0000003E0000004300000048OOOOO4D0000000300000008OOOOOOOD00000012OQOOOOl?OOOOOOLC00000021000000260000002800000030000000350000003&0000003F0000004400000049D000004K00000004000000090000000E00000013000000180000001D00000022000000270000002C0000Q031000000360000003B6

13、00000000000049oooooou0000004F00000005OOOOOOOAOOOOOOOFOOOOOOH00000019OOOOOOIE00000023000000280000002D00000032000000370000003CooooooaiooooooaG0000004B00000050Tic*rSh«rel«eory1®TicerSlfircle*oryNci«4ecie«lQ3ESSiUbuessV1.12修改程序后運(yùn)行的結(jié)果:Tic«rS<rcl<»ory(Mti<i4

14、1;ia«IlB5E533-rK_daca*C40000000000000010066660266660003000000040000000540000005000000060000000700000006000000090000000AL4000000AJOOOOOOOB0000000COOOOOOOD0000000EOOOOOOOFC4000000F0000001000000011000000120000001300000014(40000014)0000001500000016OOOOOOl?000000190000001940000019J0000001A0000001B00

15、00001COOOOOO1D0000001EC4000001EOOOOOOIF00000020666600210000002200000023(40000023)000000240000002S000000260000002?00000029140000028000000290000002AOOOOOOZBOOOOOOX0000002DC4000002D0000002E0000002F00000030OOOOOOOO00000000(40000032)OOOOOOOO00000000OOOOOOOOCiOCiCiCiCiCiOoooooooo40000037oooooooooooooooooo

16、ooooooooooooooooooooooC4000003COOOOOOOO0066666666600000OOOOOOOO00000000(40000041)OOOOOOOO00000000OOOOOOOOClOClClClClClOoooooooo40000006ooooooooooooooooooooooooooooooooooooooooaOOOOOQBoooooooooooooooooooooooooooooooooooooooo(40000050)OOOOOOOO00000000OOOOOOOOClOClClClClClOoooooooo00000055OOOOOOOO00000

17、000OOOOOOOOOOOOOOOOOOOOOOOOyTig«rSkarcNai«d«cial】V廠穴100000000000010000000200000003oooooooa000CCC65(1000050000000600000007OOOOOOOfi000000090000000A1OOOO&OOOOOOOBooooooocOOOOOOOD0000000EOOOOOOOF10000F0000001000000011000000120000001300000014(10001400000015aooooou000000170000001600000

18、0191000190000001A00Q0001B0000001C0000001P0000001E10001EOOOOOOIF0000002000000021000000220000002310002300000024000000250000002600000027000000221000280000002900Q0002A0000002B0000002C0000002P10002D0000002E0000002F0000003000000031OOOCCC3210002200000022000000340000003500000030000003?1000370000003300000039

19、0000003A0000003B0000003C10003C0000003P0000003H0000003F00000040000CCC41(10004100000042000000430000004400000045000000461000460000004?0000004800000049OODOODOA0000004B(10004B)OOOOOOUooooooai>ooooooqeooooooqfooooooso(1OOOSO0000005100000052000000S3000000S400000055100055000000560000005700000058000000590

20、000005AV3. DMA傳輸?shù)膶?shí)驗(yàn)結(jié)果:cyJtxdata4txdatalOOOOOOOOOOOOl00000002000000030000000400000005(40000000OOOOOOOl00000002000000030000000400000005100005OOOOOOOG00000007oooooooe00000009OOOOOOOA(000000093oooooooo00000007oooooooe000000090000000A(lOOOOAOOOOOOOBOOQOOOOCOOOOOOODOOOOOOOEOOOOOOOFaooQOOOiOOOOOOOBOOOOOOOC

21、OOOOOOODOOOOOOOEOOOOOOOFlOOOOFJOOOOOOIOOOQOOOll0000001200000013000000144000000FOOOOOOIO00000011000000120000001300000014100014OOOOOOIS000000160000001?000000180000001$(40000014OOOOOOIS000000160000001?00000018000000191000190000001A0000001BOOOOOOIC0000001D0000001E(400000190000001A0000001BOOOOOOIC0000001

22、D0000001E(lOOCilE)OOOOOOIF00000020000000210000002200000023(4000001C)OOOOOOIF000000200000002100000022000000231000230000002400000025000000260000002700000026(4000002300000024000000250000002G0000002700000020100028000000290000002A0000002B0000002C0000002D(40000029000000290000002A0000002B0000002C0000002D10

23、0C2I'l0000002E0000002F000000300000003100000032raooooozD0000002E0000002F00000030000000310000003210003210000003300000034000000350000003600000037400000320000003300000034000000350000003600000037100OJ70000003300000039OOOOOD3A0000003B0000003C400000370000003800000039OOOOOQ3i0000003BOOOOOO3C10003CJ00000

24、0300000003E0000003F0000004000000041(4000003C000000300000003E0000003F00000040000000411000410000004200000043000000440000004500000046(400000410000004200000043000000440000004S00000046(10004b)0000004?0000004&000000490000004A00000048V(40000046)0000004?00000049000000490000004AQ00Q004BV結(jié)果分析:由實(shí)驗(yàn)結(jié)果圖2町以看出，

25、代碼修改前傳輸了4個字的數(shù)據(jù)；而從實(shí)驗(yàn)結(jié)果圖1可以看出，代碼改為傳輸一個字后，發(fā)送的數(shù)據(jù)只接受收到一個字長度的數(shù)據(jù)：由實(shí)驗(yàn)結(jié)果3可以看出，改為DMA傳輸后，發(fā)送的所有數(shù)據(jù)均接收到了。4-實(shí)驗(yàn)2內(nèi)存與SDRAM間的二維DMA通信實(shí)驗(yàn)實(shí)驗(yàn)原理二維DMA將存儲區(qū)中的數(shù)據(jù)塊作為一個數(shù)據(jù)陣列進(jìn)行傳輸，有利于執(zhí)行矩陣操作的DSP算法。若要進(jìn)行二維DMA傳輸，對DX、DY寄存器都要進(jìn)行設(shè)置，同時在DP寄存器中使能二維DMA（第27位）。DX增量寄存器（DX低16位）保存的是偏移值，此值加上當(dāng)前地址后指向X維的下一數(shù)據(jù)元素（下一內(nèi)循壞首址），DX計(jì)數(shù)寄存器（DX高十六位）保存在X維方向（循壞內(nèi)部）需要傳輸?shù)淖?/p>

26、數(shù)，傳輸一次減一，可以指示當(dāng)前行中待傳輸?shù)淖謹(jǐn)?shù)。DY增量寄存器保存的是Y維方向（外循壞）的偏移值，此值加上當(dāng)前地址可以指示Y維方向上下一個數(shù)據(jù)元素（卞外循壞的首址）。DY計(jì)數(shù)寄存器初始值是Y維的傳輸單元數(shù)（外循環(huán)次數(shù)），每當(dāng)DX計(jì)數(shù)器減少至零時，其值才減一。當(dāng)Y計(jì)數(shù)寄存器內(nèi)容減為零時，DMA傳輸完成。二維DMA的具體執(zhí)行過程：1輸出保存在TCBDI寄存器中的當(dāng)前地址，啟動一個DMA存儲器周期；2）在此周期內(nèi)，將TCBDX增量寄存器中的值與當(dāng)前DI寄存器中的當(dāng)前地址相加，產(chǎn)生下一個要訪問的數(shù)據(jù)元素地址，同時更新DI寄存器的值；3DX計(jì)數(shù)器的值減一，然后跳回第二步執(zhí)行，直至DX計(jì)數(shù)器值減為零；4）

27、DX計(jì)數(shù)器減為零后，DX計(jì)數(shù)器被重新加載原來的初始值：5DY增量寄存器的值加到DI寄存器中的當(dāng)前地址；6）DY計(jì)數(shù)寄存器內(nèi)容減一，然后從第二步繼續(xù)開始執(zhí)行，直至DY計(jì)數(shù)器減少至零,完成二維DMA傳輸。相關(guān)寄存器說明：TCB寄存器TCB寄存器是一個128位的四字組寄存器，由DI、DX、DY和DP寄存器組成：a）DI是DMA索引寄存器，包括了將要發(fā)送或者接收的數(shù)據(jù)的源地址或者目的地址,既可以指向內(nèi)部存儲器又可以指向外部存儲器，也可指向鏈路Hb）DX包含了一個16位（高）的計(jì)數(shù)值和一個26位的修改量，若使能了二維DMA則該寄存器保存的只是X方向的計(jì)數(shù)值和修改量c）DY與DX結(jié)合一起使用，保存了Y方向

28、上的16位計(jì)數(shù)值和16位修改量。如果只進(jìn)行一維DMA傳輸，就不需要設(shè)置該寄存器。d）DP寄存器包括了DMA所有控制信息，分為兩個主要段312221011鏈?zhǔn)街羔?amp;鏈標(biāo)記（用于鏈?zhǔn)紻MA）對DP寄存器各位功能說明:位說明位說明0T4四字地址（TCB指1；2526操作數(shù)據(jù)長度：01=32位，10=64位，22=128位1516鏈指針選擇存儲單元1721鏈目的通道27二維DMA使能22使能鏈?zhǔn)紻MA28DMA請求優(yōu)先級，0=正常優(yōu)先級，"髙優(yōu)先級23DMA請求使能24DMA中斷使能2931指定DMA設(shè)備類型源代碼中寄存器的對應(yīng)關(guān)系:XRO<>DIRegisterXR1&

29、lt;->DXRegisterXR2<->DYRegisterXR3<>DPRegisterDCSO<>TRANSMITTETCBREGISTERSYRO<>DIRegisterYR1<>DXRegisterYR2<->DYRegisterYR3<>DPRegisterDCDO<->RECEIVERTCBREGISTERS 實(shí)驗(yàn)步驟1）啟動VisualDSP+,新建工程命名為test2_2,路徑選擇為D:DSP，并將源代碼文件夾下默認(rèn)生成的test2_2.c文件移除；2）新建空白文件（選擇菜i

30、FileNewFile）,輸入?yún)⒖荚创a，保存為DMA_2.asm,并將其添加到工程中；3）并析、理解源程序，并編譯文件糾錯；4）建立鏈接文件（選擇菜單Tools->ExpertLinker-CreateLDF）4）編譯整個工程，若出現(xiàn)錯誤“Thefollowingsymbolsreferencedinprocessor'pO'couldnotberesolved:'main_main'referencedfrom'ts_hdr_TS201.doj'”處理方法同前一個實(shí)驗(yàn)。一5）重新編譯工程，為方便觀察存儲器內(nèi)相應(yīng)地址其內(nèi)容變化，在_Don

31、e處設(shè)置斷點(diǎn)，同時打開兩個存儲器觀察窗口（選擇菜單Memory->TigerSHARCMemory）分別輸入tx_data和rx_datao6）運(yùn)行（RUN）工程，程序自動運(yùn)行至_Done后停止,觀察tx_data內(nèi)數(shù)據(jù)值,然后單步運(yùn)行程序（按鍵），觀察rx_data內(nèi)數(shù)據(jù)變化。 實(shí)驗(yàn)結(jié)果：1. 源代碼執(zhí)行后的結(jié)果:10000010000410000810000C10001010001410001810001C10002010002410002810002C10003010003410003810003Ccx_da.ta000000010000000S000000090000000D00

32、00001100000015000000190000001D0000002100000025000000290000002D000000310000003S000000390000003D0000000200000006D00000QAD000000E00000012000000160000001AD000001E00000022000000260000002A0000002E00000032000000360000003&0000003E0000000300000007000000OBOOOOOOOF000000130000001?0000001B0000001F0000002300

33、0000270000002B0000002F00000033000000370000003B0000003F000000040000000B000000DC0000001000000011000000160000001C00000020000000240000002B0000002C00000030000000340000003B0000003C0000004040000000400000044000000BJ4000000C40000010400000141400000184000001CJ40000020400000244000002814000002C400000304000003140

34、00003BJ4000003C400000400000000100000005000000090000O00D0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000060000000A0000000E0000000000000000000000000000000000000000000000000000000000000000OOOODDOO0000000000000000000000000000000000000

35、00300000007000O000BOOOOOOOF0000000000000000000000000000000000000000000000000000000000000000OOOODDOOoooooooo00000000oooooooooooooooo0000000400000008ooooooocoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo2代碼修改后運(yùn)行的結(jié)果:Ti<erS*korcwr*yLVe

36、z«4eci*al1JTicerSharcBeoery(KezadeciaalJ100000100004100008nooooc10001010001410001810001C10002010002410002910002C10003010003410003810003Ctx_data0000000100000005000000090000000200000003000000040000000600000007OOOOOOOBOOOOOOOAOOOOOOOBOODOOODCOOOOOOODOOOOOOOEOOOOOOOF00000010000000110000001200000013

37、00000014000000150000001600000017OOODDOIB000000190000001A000000LE0000001C0000001D0000001E000000LF000DD0200000002100000022000000230000002400000025000000260000002?00000026000000290000002A0000002E0000002C0000002D0000002E0000002F0000003000000031000000320000003300000034000000350000003600000037000DD03B0000

38、00390000003A0000003B0000003C0000003D0000003E0000003F0000004050000000500000015000000BJS000000C150000010500000145000001B50DDDD1CJS0000020150000024500000285000002C5000003050DDDD3450000038J50DDDD3CrM_data0000000100000000000000050000000000000008000000000000000200000000000000060000000000000003000000000000

39、00070000000000000004000000000000000800000000LJOOOOOOOAOOOOOOOBoooooooc000000000000000000000000OOOOOOODOOOOOOOEOOOOOOOF00000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

40、000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000100004J10000310000C10001010001410001310001C10002010002410002810002CJ100030100034100038100030tx_daca0DDDDDD10000000500000009OOOOOOOD000000110000001500000019OOOOOOID00000021000000250

41、00000290000003D0000003100000035000000390000003D000000020000000300000004000000060000000700000008OOOOOOOAOOOOOOOBooooooocOOOOOOOEOOOOOOOF000000100000001200000013000000140000001600000017000000180000001A0000001B0000001COClOOOOlE0000001F00000020000000220000002300000024000000260000002700000028000000200000

42、02B0000002C0000002E0000002F00000030000000320000003300000030000003600000037000000390000003A0000003B0000003C0000003E0000003F000000405000000050000004500000085000000C5000001050000014500000185000001C5000002050000024500000285000002C5000003050000034500000385000003Crz_data00000001000000000000000900000000000

43、00011000000000000001900000000000000000000000000000000000000000000000000000000000000000000000000000002000000030000000000000000OOOOOOOAOOOOOOOE0000000000000000000000120000001300000000000000000000001A0000001300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

44、00000000000000000000000000000000000000000000000000000000400000000oooooooc000000000000001400000000OODOOOLC0000000000000000000000000000000000000000000000000000000000000000000000003代碼修改為只接收奇數(shù)數(shù)據(jù)后的運(yùn)行結(jié)果:Tic<irSh«rclaary-Maxdcciaalrx_dataLODOOO100004100008LOOOOC100010100014100013L0001C100020100024(

45、100028(L0002Ctx_data000000010000000500000009OOOOOOOD000000110000001500000019OOOOOOID0000002100000025000000290000002D0000000200000006OOOOOOOAOOOOOOOE00000012DD000016OOOOOOIDooaoooiE000000220000002600000020000002E0000000300000007OOOOOOOBOOOOOOOF00000013000000170000001B0000001F00000023000000270000002B0

46、000002F0000000400000008OOOOOOOC0000001000000014000000180000001C0000002000000024000000280000002C00000030100000001100000041400000081000000C4000001010000014400000184000001C4000002040000024J400000284D0Q002Crx_dd.ta00000001000000090000001100000019ooooooooooooooooooooooooooooooooooooooooooooooooaaooooooqq

47、oooodo00000003OOOOOOOB000000130000001Boooooooooooooooooooooooooooooooooooooooooooooooooooooooaoooodooo00000005OOOOOOOD00000015OOOOOOIDooooooooooooooooooooooooooooooooooooooooooooooooOOODDOOOOOODDQQO00000007OOOOOOOF000000170000001FooooooooooooooooooooooooooooooooooooooooooooooooOODDOOOOOODDQQOO結(jié)果分析:從實(shí)驗(yàn)結(jié)果圖1可以看到，接收到了發(fā)送地所有數(shù)據(jù)；從實(shí)驗(yàn)結(jié)果圖21可以看出，發(fā)送的數(shù)據(jù)每隔一個字接收，從實(shí)驗(yàn)結(jié)果圖2.2可以看到，接收了數(shù)據(jù)，并且是每隔一個字接收，且這一個字的數(shù)據(jù)丟失了；從實(shí)驗(yàn)結(jié)果圖3可以看出，只接收了奇數(shù)數(shù)據(jù)，并且接收到的數(shù)據(jù)按順序排列。4-實(shí)驗(yàn)3無限脈沖響應(yīng)數(shù)字濾波器(IIR)的設(shè)計(jì)實(shí)驗(yàn)實(shí)驗(yàn)原理所謂的數(shù)字濾波，指的是輸入、輸出均為數(shù)字信號，通過一定運(yùn)算關(guān)系改變輸入信號所含頻率成分的相對比例或者濾除某些頻率成分。數(shù)字濾波可分為無限脈沖響應(yīng)(IIR)濾波和有限脈沖響應(yīng)(FIR)濾波。本次試驗(yàn)利用VISUALDSP+軟壞境SIMULATOR模擬