基于PIC12C508 DTMF拔号程序编写分享.doc

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1、基于PIC12C508 DTMF拔号程序编写分享pIC12C508 DTMF拔号程序;|Name:MAIN.ASM|;|Description:DTMF-RS232converter（forusewithPCNummerViser）|;|DetectsDTMFandringing，andtransmitstoastd.|;|RS232port，at2400baud.|;|;+-+;|Platform:PIC12C508（A）（usinginternal4MHzRC-oscillator）|;|Uses:90-342W/512Wprogram-mem（allswitchessetto0/1）|;

2、|6B/25Bdata-mem|;|Assembler:MPASM2.20（MPLAB4.00.00）|;|Comments：-|;+=+TITLEDTMFtoRS232converterPROCESSOR12C508_CONFIG_CP_OFFINCLUDERADIXDEC_IDLOCSh0104OTPSET1;Usefactory-storedcal.-value（onOneTImeProgrammable）TMR0CLKSET1;UseTMR0externalclockat3，579545MHz（insteadofIntRC）。PARITYSET1;Useevenparity-bitwh

3、entransmitTIngtotheserialport.CLIONLYSET1;TransmitsCLI（A-numbers）only.RINGSET1;Transmitsringing.IDENTTXSET1;Transmitsidentwhenpressing*（DTMF）。PWRUPIDSET1;Transmitsshortidentatpowerup.ASCIISET1;TransmitsASCII-charsinsteadofbinary：;DigitASCIIBinaryDigitASCIIBinary;00（48d）0000000099（57d）00001001;11（49d

4、）00000001AA（65d）00001010;22（50d）00000010BB（66d）00001011;33（51d）00000011CC（67d）00001100;44（52d）00000100DD（68d）00001101;55（53d）00000101*（42d）00001110;66（54d）00000110#（35d）00001111;77（55d）00000111RingR（82d）00010000;88（56d）00001000;-+*Constants*+-IFTMR0CLK=0;InternaloscillatorOPTION_REGequb10000001;Defa

5、ulttimer/prescalersetupENDIFIFTMR0CLK=1;ExternalTMR0source（3，579545MHz）OPTION_REGequb10100011;Defaulttimer/prescalersetupENDIF#defineDTMF0GPIO，0;Bit0（LSB）fromMT8870#defineDTMF1GPIO，1;Bit1fromMT8870#defineDTMF2GPIO，3;Bit2fromMT8870/_Ring-detector#defineDTMF3GPIO，4;Bit3fromMT8870/TxD-output（high=sPACe

6、）#defineDTMFOKGPIO，5;DTMFdetected，andreadyatDTMF0-3;-+*Variabledeclaration*+-cblock0ChDTMFvalidentvalmisctemp1，temp2，teMP3;Temp-variablesendc#defineCLIPmisc，0;SetwhenCLIPdetected#defineCLIPendmisc，1;SetbyCLIPdetwhen#received#defineIdentOKmisc，2;Setwhenidentdetected（*）;-+*Resetvector*+-ORG0hrst_vecto

7、r：MOVwfOSCCAL;Setoscillatorcalibration.callinitIFPWRUPID=1gotopwrupidentpwrupidentreturn：ENDIFgotomain;-+*Identity（locatedlowbecauseofnoCP64b）*+-identtable：IFIDENTTX=1addwfPCL，Fdt“+PCNummerViser+”，13dt“Firmwarev1.04”，13，13dt“JaCOBBlichfELDt98”，13，13，13，0ENDIFpwrupidenttable：IFPWRUPID=1addwfPCL，Fdt“D

8、TMFTORS232”，60，“0104”，62，0ENDIF;-+*Initialization*+-init：;SetupI/O-direction（GP0-3，5=input，GP4=output）MOVlwb11101111trisGPIO;TxD=Space（GP4=low）MOVlwb00000000MOVwfGPIO;EnableportBpull-up，dISAblewake-uponPINchange;SetupT0=inc.oneitherOSC.orTMR0，prescaler=4/16（dependsonTMR0CLK）clrwdtMOVlwOPTION_REGopti

9、onclrfmiscclrfidentvalretlw0;-+*Power-upidentitytransmission*+-IFPWRUPID=1pwrupident：MOVlw4;waitapprox.1secondMOVwftemp3pwrup11:clrftemp2pwrup12clrftemp1pwrup13:clrwdtdecfsztemp1，Fgotopwrup13decfsztemp2，Fgotopwrup12decfsztemp3，Fgotopwrup11MOVlwh0FFMOVwftemp3pwrup2:clrwdtincftemp3，FMOVftemp3，Wcallpwr

10、upidenttable;Fetchtextclrftemp2subwftemp2，FbtfscSTATUS，Z;Endoftable？gotopwrupendcalltxsergotopwrup2pwrupend：gotopwrupidentreturnENDIF;-+*Main*+-main:gotoDTMFdetDTMFdetreturn：gotoringdetringdetreturn：gotomain;Repeatmain;ReadDTMF-bitsfrom8870，convertstonibble，andreturnsinW.readDTMF：MOVfGPIO，Wandlwb000

11、00011;Getbit0-1MOVwfDTMFvalbsfDTMFval，2;Getbit2btfssDTMF2bcfDTMFval，2MOVlwb11111111;Getbit3（DTMF3=input）bcfDTMFval，3trisGPIOMOVlwb11101111btfscDTMF3bsfDTMFval，3trisGPIO;DTMF3=OutputbcfDTMF3MOVfDTMFval，W;Convertfrom8870-normalandlwb00001111callDTMFtableMOVwfDTMFvalretlw0DTMFtable：addwfPCL，Fretlwb0000

12、1101;DTMFDretlwb00000001;DTMF1retlwb00000010;DTMF2retlwb00000011;DTMF3retlwb00000100;DTMF4retlwb00000101;DTMF5retlwb00000110;DTMF6retlwb00000111;DTMF7retlwb00001000;DTMF8retlwb00001001;DTMF9retlwb00000000;DTMF0retlwb00001110;DTMF*retlwb00001111;DTMF#retlwb00001010;DTMFAretlwb00001011;DTMFBretlwb0000

13、1100;DTMFC;ConvertsreceivedDTMFtoASCII（returnsinW）conASCII：IFASCII=1addwfPCL，FretlwA0retlwA1retlwA2retlwA3retlwA4retlwA5retlwA6retlwA7retlwA8retlwA9retlwAAretlwABretlwACretlwADretlwA*retlwA#ENDIF;Testsfor3subsequent*。ident：IFIDENTTX=1bcfIdentOKMOVlwb00001110;DTMF*subwfDTMFval，WbtfssSTATUS，Zgotoident

14、1incfidentval，FMOVlwd3subwfidentval，WbtfssSTATUS，ZgotoidentendbsfIdentOKident1:clrfidentvalidentend：retlw0ENDIF;TransmitsWat2400bps/std.RS232.Calculatesparity-bit.Returnswhendone.txser：MOVwftemp1bcfSTATUS，C;Transmitstart-bitcalltxcarryMOVlwd8;Transmit8databitsMOVwftemp2txbits:clrwdtrrftemp1，Fcalltxc

15、arrydecfsztemp2，FgototxbitsIFPARITY=1rrftemp1，F;calculateparity（even）swapftemp1，Wxorwftemp1，WMOVwftemp1rrftemp1，Frrftemp1，Fxorwftemp1，Frrftemp1，Wxorwftemp1，FbcfSTATUS，Cbtfsctemp1，0bsfSTATUS，CcalltxcarryENDIFbsfSTATUS，C;Transmit2*stop-bitcalltxcarrybsfSTATUS，Ccalltxcarryretlw0;transmitcarry-flagIFTMR

16、0CLK=0txcarry:MOVlw（256-104）;2400=416，666us=1666，666c/16=104，17ENDIFIFTMR0CLK=1txcarry:MOVlw（256-93）;2400=416，666us=1491，477c/16=93，22ENDIFtxndone:btfscTMR0，7;Lastbittransmitted（TMR0ovfl.）？gototxndonebsfDTMF3;SpacebtfscSTATUS，C;Settomark（-12V）ifCarry=1;（RS232invertsoutput）bcfDTMF3;MarkMOVwfTMR0retlw

17、0;RecognizesCLIP（DTMFreceivedinA），andsets/clearsCLIP.IFCLIONLY=1CLIPdet：MOVwftemp1MOVlwb00001010;DTMFAsubwftemp1，WbtfssSTATUS，ZgotoCLIPdet2bsfCLIPgotoCLIPdetendCLIPdet2:MOVlwb00001101;DTMFDsubwftemp1，WbtfssSTATUS，ZgotoCLIPdet3bsfCLIPgotoCLIPdetendCLIPdet3:btfssCLIPgotoCLIPdetendMOVlwb00001111;DTMF#s

18、ubwftemp1，WbtfssSTATUS，ZgotoCLIPdetendbcfCLIPbsfCLIPendCLIPdetend：retlw0ENDIF;DTMF-detection-CallsreadDTMF，CLIPdet，conASCIIandtxserifDTMFispresent.;ReturnswhenDTMFisreMOVed.DTMFdet:clrwdtbtfssDTMFOKgotoDTMFdetreturngoto$+1;DoublenopbtfssDTMFOKgotoDTMFdetreturncallreadDTMF;DTMFpresent，read！IFIDENTTX=

19、1;Transmitidentif*receivedcallidentbtfssIdentOKgotoDTMFdet2MOVlwh0FFMOVwftemp3DTMFdet1:clrwdtincftemp3，FMOVftemp3，Wcallidenttable;Fetchtextclrftemp2subwftemp2，FbtfscSTATUS，Z;Endoftable？gotoDTMFdet2calltxsergotoDTMFdet1ENDIFDTMFdet2：MOVfDTMFval，WIFCLIONLY=1;TransmitonlyCLIcallCLIPdetbtfssCLIPend;Last

20、digitinCLI（#）？gotoDTMFdet21bcfCLIPendgotoDTMFdet22DTMFdet21：btfssCLIPgotoDTMFoffDTMFdet22：MOVfDTMFval，WENDIFIFASCII=1;ConverttoASCIIMOVfDTMFval，WcallconASCIIENDIFcalltxser;TransmittoserialportDTMFoff:clrwdt;WaitforDTMFtostopbtfscDTMFOKgotoDTMFoffDTMFend:gotoDTMFdetreturn;Ring-detection-Ifringingispr

21、esent，callstxserwithW=（ascii）R。;ReturnswhenringingendsorDTMFispresent.ringdet:clrwdtIFRING=1btfscDTMF2gotoringendringdet2：;Waitforringing-pulsetoclrwdt;stop（orDTMFpresent）。btfscDTMFOKgotoringendbtfssDTMF2gotoringdet2MOVlwb10000111;Setuptimer:50msbeforeoverflow.optionMOVlwd50MOVwfTMR0ringdet3:clrwdt;

22、Waitfornewringing-pulseMOVlw0subwfTMR0，WbtfscSTATUS，ZgotoringendbtfscDTMF2gotoringdet3;Newpulsepresent.MOVlwOPTION_REG;RestoreoldprescaleroptionMOVlwAR;TransmitRcalltxserbcfCLIP;TerminateCLIP-sequence（ringdet.）MOVlwb10000111;Setuptimer:50msbeforeoverflow.optionringdet4:MOVlwd50MOVwfTMR0ringdet5:clrw

23、dt;WaitforringingtoendbtfssDTMF2gotoringdet4MOVlw0subwfTMR0，WbtfscSTATUS，ZgotoringendbtfssDTMFOKgotoringdet5ringend:MOVlwOPTION_REG;RestoreoldprescaleroptionENDIFgotoringdetreturnIFOTP=0ORGh1FF;（old12C508calibration-val.）MOVlwh0A0ENDIFEND+-+|History|+-+Rev.ChangeReasonDate-0.0aSource-filecreated.-24

24、.03.980.5aHierarchischdiagramfinished.-25.03.981.0aEverythingimplemented，readyfortest.-26.03.981.0bTestedinreallife。.Everythingok，-27.03.98（minorbugsreMOVed）。1.0Firstversion，inuse。-27.03.981.01Fixed#nottransmittedwhenCLIP=1.-29.03.98FixedD-sequencesnotrecognizedasCLIP（nottransmittedwhenCLIP=1）。Imple

25、mentedPwrUpIdent.Givespossibilityofauto-detection，andFW-versiondetection.1.02Implementedpossibilityofusingext.Moreprecisethan09.04.98TMR0source，astimebaseforRS232-internalRC-munication.BugfixedCLIPdet.ASCII-tablelocatedinupperpagewhenallswitches=1.1.03r+Firstpublicrelease.+IncasetheCLI-02.05.98Break

26、CLIP-sequenceifringdetected.sequenceisnottermi-natedprobably（becauseoflinenoiseetc.）1.04rMinorchanges/bugfixes:18.03.99ChangedTX-timing.Transmittedat2325bps.Changedformatfrom8E1to8E2Enablesreceivertore-（2stopbits）.syncronizebetweeneachbyte，therebysupressingframing-errors.Minimizedread-DTMFtiming.ReMOVesunwanted10usglitchonTXjustbeforetransmittingadigit.Ideas/futurechanges：-AddEEPROMandchangepower-supply，toenablereception/storingofDTMF，whenthePCisturnedoff.Addoffhookdetector，toenablelengthofconversation，andanswered/notansweredcalllogging.