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pIC12C508 DTMF拔號程序
;|Name:MAIN.ASM|
;|Description:DTMF-》RS232converter（forusewithPCNummerViser）|
;|DetectsDTMFandringing，andtransmitstoastd.|
;|RS232port，at2400baud.|
;|||
;+--------------------------------------------------------------------+
;|Platform:PIC12C508（A）（usinginternal4MHzRC-oscillator）|
;|Uses:90-342W/512Wprogram-mem（all’switches’setto0/1）|
;|6B/25Bdata-mem|
;|Assembler:MPASM2.20（MPLAB4.00.00）|
;|Comments：-|
;+====================================================================+
TITLE’DTMFtoRS232converter’
PROCESSOR12C508
__CONFIG_CP_OFF&_MCLRE_OFF&_IntRC_OSC&_WDT_ON
INCLUDE
RADIXDEC
__IDLOCSh’0104’
OTPSET1;Usefactory-storedcal.-value（onOneTimeProgrammable）
TMR0CLKSET1;UseTMR0externalclockat3，579545MHz（insteadofIntRC）。
PARITYSET1;Useevenparity-bitwhentransmittingtotheserialport.
CLIONLYSET1;TransmitsCLI（A-numbers）only.
RINGSET1;Transmitsringing.
IDENTTXSET1;Transmits’ident’whenpressing’***’（DTMF）。
PWRUPIDSET1;Transmitsshort’ident’atpowerup.
ASCIISET1;TransmitsASCII-charsinsteadofbinary：
;DigitASCIIBinaryDigitASCIIBinary
;00（48d）0000000099（57d）00001001
;11（49d）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;Internaloscillator
OPTION_REGequb’10000001’;’Default’timer/prescalersetup
ENDIF
IFTMR0CLK==1;ExternalTMR0source（3，579545MHz）
OPTION_REGequb’10100011’;’Default’timer/prescalersetup
ENDIF
#defineDTMF0GPIO，0;Bit0（LSB）fromMT8870
#defineDTMF1GPIO，1;Bit1fromMT8870
#defineDTMF2GPIO，3;Bit2fromMT8870/_Ring-detector
#defineDTMF3GPIO，4;Bit3fromMT8870/TxD-output（high=sPACe）
#defineDTMFOKGPIO，5;DTMFdetected，andreadyatDTMF0-3
;---+++***Variabledeclaration***+++---
cblock0Ch
DTMFval
identval
misc
temp1，temp2，teMP3;Temp-variables
endc
#defineCLIPmisc，0;SetwhenCLIPdetected
#defineCLIPendmisc，1;SetbyCLIPdetwhen#received
#defineIdentOKmisc，2;Setwhen’ident’detected（***）
;---+++***Resetvector***+++---
ORG0h
rst_vector：
MOVwfOSCCAL;Setoscillatorcalibration.
callinit
IFPWRUPID==1
gotopwrupident
pwrupidentreturn：
ENDIF
gotomain
;---+++***Identity（located’low’becauseofnoCP《64b）***+++---
identtable：
IFIDENTTX==1
addwfPCL，F
dt“+++PCNummerViser+++”，13
dt“Firmwarev1.04”，13，13
dt“JaCOBBlichfELDt’98”，13，13，13，0
ENDIF
pwrupidenttable：
IFPWRUPID==1
addwfPCL，F
dt“DTMFTORS232”，60，“0104”，62，0
ENDIF
;---+++***Initialization***+++---
init：
;SetupI/O-direction（GP0-3，5=input，GP4=output）
MOVlwb’11101111’
trisGPIO
;TxD=Space（GP4=low）
MOVlwb’00000000’
MOVwfGPIO
;EnableportBpull-up，dISAblewake-uponPINchange
;SetupT0=inc.oneitherOSC.orTMR0，prescaler=4/16（dependsonTMR0CLK）
clrwdt
MOVlwOPTION_REG
option
clrfmisc
clrfidentval
retlw0
;---+++***Power-upidentitytransmission***+++---
IFPWRUPID==1
pwrupident：
MOVlw4;waitapprox.1second
MOVwftemp3
pwrup11:clrftemp2
pwrup12clrftemp1
pwrup13:clrwdt
decfsztemp1，F
gotopwrup13
decfsztemp2，F
gotopwrup12
decfsztemp3，F
gotopwrup11
MOVlwh’0FF’
MOVwftemp3
pwrup2:clrwdt
incftemp3，F
MOVftemp3，W
callpwrupidenttable;Fetchtext
clrftemp2
subwftemp2，F
btfscSTATUS，Z;Endoftable？
gotopwrupend
calltxser
gotopwrup2
pwrupend：
gotopwrupidentreturn
ENDIF
;---+++***Main***+++---
main:gotoDTMFdet
DTMFdetreturn：
gotoringdet
ringdetreturn：
gotomain;Repeatmain
;ReadDTMF-bitsfrom8870，convertstonibble，andreturnsinW.
readDTMF：
MOVfGPIO，W
andlwb’00000011’;Getbit0-1
MOVwfDTMFval
bsfDTMFval，2;Getbit2
btfssDTMF2
bcfDTMFval，2
MOVlwb’11111111’;Getbit3（DTMF3=input）
bcfDTMFval，3
trisGPIO
MOVlwb’11101111’
btfscDTMF3
bsfDTMFval，3
trisGPIO;DTMF3=Output
bcfDTMF3
MOVfDTMFval，W;Convertfrom8870-》’normal’
andlwb’00001111’
callDTMFtable
MOVwfDTMFval
retlw0
DTMFtable：
addwfPCL，F
retlwb’00001101’;DTMF’D’
retlwb’00000001’;DTMF’1’
retlwb’00000010’;DTMF’2’
retlwb’00000011’;DTMF’3’
retlwb’00000100’;DTMF’4’
retlwb’00000101’;DTMF’5’
retlwb’00000110’;DTMF’6’
retlwb’00000111’;DTMF’7’
retlwb’00001000’;DTMF’8’
retlwb’00001001’;DTMF’9’
retlwb’00000000’;DTMF’0’
retlwb’00001110’;DTMF’*’
retlwb’00001111’;DTMF’#’
retlwb’00001010’;DTMF’A’
retlwb’00001011’;DTMF’B’
retlwb’00001100’;DTMF’C’
;ConvertsreceivedDTMFtoASCII（returnsinW）
conASCII：
IFASCII==1
addwfPCL，F
retlwA’0’
retlwA’1’
retlwA’2’
retlwA’3’
retlwA’4’
retlwA’5’
retlwA’6’
retlwA’7’
retlwA’8’
retlwA’9’
retlwA’A’
retlwA’B’
retlwA’C’
retlwA’D’
retlwA’*’
retlwA’#’
ENDIF
;Testsfor3subsequent’*’。
ident：
IFIDENTTX==1
bcfIdentOK
MOVlwb’00001110’;DTMF’*’
subwfDTMFval，W
btfssSTATUS，Z
gotoident1
incfidentval，F
MOVlwd’3’
subwfidentval，W
btfssSTATUS，Z
gotoidentend
bsfIdentOK
ident1:clrfidentval
identend：
retlw0
ENDIF
;TransmitsWat2400bps/std.RS232.Calculatesparity-bit.Returnswhendone.
txser：
MOVwftemp1
bcfSTATUS，C;Transmitstart-bit
calltxcarry
MOVlwd’8’;Transmit8databits
MOVwftemp2
txbits:clrwdt
rrftemp1，F
calltxcarry
decfsztemp2，F
gototxbits
IFPARITY==1
rrftemp1，F;calculateparity（even）
swapftemp1，W
xorwftemp1，W
MOVwftemp1
rrftemp1，F
rrftemp1，F
xorwftemp1，F
rrftemp1，W
xorwftemp1，F
bcfSTATUS，C
btfsctemp1，0
bsfSTATUS，C
calltxcarry
ENDIF
bsfSTATUS，C;Transmit2*stop-bit
calltxcarry
bsfSTATUS，C
calltxcarry
retlw0
;transmitcarry-flag
IFTMR0CLK==0
txcarry:MOVlw（256-104）;2400=416，666us=1666，666c/16=104，17
ENDIF
IFTMR0CLK==1
txcarry:MOVlw（256-93）;2400=416，666us=1491，477c/16=93，22
ENDIF
txndone:btfscTMR0，7;Lastbittransmitted（TMR0ovfl.）？
gototxndone
bsfDTMF3;Space
btfscSTATUS，C;Settomark（-12V）ifCarry=1
;（RS232invertsoutput）
bcfDTMF3;Mark
MOVwfTMR0
retlw0
;RecognizesCLIP（DTMFreceivedinA），andsets/clearsCLIP.
IFCLIONLY==1
CLIPdet：
MOVwftemp1
MOVlwb’00001010’;DTMF’A’
subwftemp1，W
btfssSTATUS，Z
gotoCLIPdet2
bsfCLIP
gotoCLIPdetend
CLIPdet2:MOVlwb’00001101’;DTMF’D’
subwftemp1，W
btfssSTATUS，Z
gotoCLIPdet3
bsfCLIP
gotoCLIPdetend
CLIPdet3:btfssCLIP
gotoCLIPdetend
MOVlwb’00001111’;DTMF’#’
subwftemp1，W
btfssSTATUS，Z
gotoCLIPdetend
bcfCLIP
bsfCLIPend
CLIPdetend：
retlw0
ENDIF
;DTMF-detection-CallsreadDTMF，CLIPdet，conASCIIandtxserifDTMFispresent.
;ReturnswhenDTMFisreMOVed.
DTMFdet:clrwdt
btfssDTMFOK
gotoDTMFdetreturn
goto$+1;Doublenop
btfssDTMFOK
gotoDTMFdetreturn
callreadDTMF;DTMFpresent，read！
IFIDENTTX==1;Transmitidentif’***’received
callident
btfssIdentOK
gotoDTMFdet2
MOVlwh’0FF’
MOVwftemp3
DTMFdet1:clrwdt
incftemp3，F
MOVftemp3，W
callidenttable;Fetchtext
clrftemp2
subwftemp2，F
btfscSTATUS，Z;Endoftable？
gotoDTMFdet2
calltxser
gotoDTMFdet1
ENDIF
DTMFdet2：
MOVfDTMFval，W
IFCLIONLY==1;TransmitonlyCLI
callCLIPdet
btfssCLIPend;LastdigitinCLI（#）？
gotoDTMFdet21
bcfCLIPend
gotoDTMFdet22
DTMFdet21：
btfssCLIP
gotoDTMFoff
DTMFdet22：
MOVfDTMFval，W
ENDIF
IFASCII==1;ConverttoASCII
MOVfDTMFval，W
callconASCII
ENDIF
calltxser;Transmittoserialport
DTMFoff:clrwdt;WaitforDTMFtostop
btfscDTMFOK
gotoDTMFoff
DTMFend:gotoDTMFdetreturn
;Ring-detection-Ifringingispresent，callstxserwithW=（ascii）’R’。
;ReturnswhenringingendsorDTMFispresent.
ringdet:clrwdt
IFRING==1
btfscDTMF2
gotoringend
ringdet2：;Waitforringing-pulseto
clrwdt;stop（orDTMFpresent）。
btfscDTMFOK
gotoringend
btfssDTMF2
gotoringdet2
MOVlwb’10000111’;Setuptimer:50msbeforeoverflow.
option
MOVlwd’50’
MOVwfTMR0
ringdet3:clrwdt;Waitfornewringing-pulse
MOVlw0
subwfTMR0，W
btfscSTATUS，Z
gotoringend
btfscDTMF2
gotoringdet3
;Newpulsepresent.
MOVlwOPTION_REG;Restoreoldprescaler
option
MOVlwA’R’;Transmit’R’
calltxser
bcfCLIP;TerminateCLIP-sequence（ringdet.）
MOVlwb’10000111’;Setuptimer:50msbeforeoverflow.
option
ringdet4:MOVlwd’50’
MOVwfTMR0
ringdet5:clrwdt;Waitforringingtoend
btfssDTMF2
gotoringdet4
MOVlw0
subwfTMR0，W
btfscSTATUS，Z
gotoringend
btfssDTMFOK
gotoringdet5
ringend:MOVlwOPTION_REG;Restoreoldprescaler
option
ENDIF
gotoringdetreturn
IFOTP==0
ORGh’1FF’;（old12C508calibration-val.）
MOVlwh’0A0’
ENDIF
END
+---------------------------------------------------------------------+
|History|
+---------------------------------------------------------------------+
Rev.ChangeReasonDate
--------------------------------------------------------------------------------
0.0aSource-filecreated.-24.03.98
0.5aHierarchischdiagramfinished.-25.03.98
1.0aEverythingimplemented，readyfortest.-26.03.98
1.0bTestedin’reallife’。。.Everythingok，-27.03.98
（minorbugsreMOVed）。
1.0Firstversion，’inuse’。-27.03.98
1.01Fixed’#’nottransmittedwhenCLIP=1.-29.03.98
Fixed’D’-sequencesnotrecognizedas
CLIP（nottransmittedwhenCLIP=1）。
ImplementedPwrUpIdent.Givespossibilityof
auto-detection，and
FW-versiondetection.
1.02Implementedpossibilityofusingext.Moreprecisethan09.04.98
TMR0source，astimebaseforRS232-internalRC-oscillator.
communication.
BugfixedCLIPdet.ASCII-tablelocatedin
upperpagewhenall
switches=1.
1.03r+++First’public’release.+++IncasetheCLI-02.05.98
BreakCLIP-sequenceifringdetected.sequenceisnottermi-
natedprobably（because
oflinenoiseetc.）
1.04rMinorchanges/bugfixes:18.03.99
ChangedTX-timing.Transmittedat~2325bps.
Changedformatfrom8E1to8E2Enablesreceivertore-
（2stopbits）.syncronizebetweeneach
byte，therebysupressing
framing-errors.
Minimized’read-DTMF’timing.ReMOVesunwanted10us
glitchonTXjustbefore
transmittingadigit.
Ideas/futurechanges：
-------------------------------------------------------------------------------
AddEEPROMandchangepower-supply，toenablereception/storingofDTMF，when
thePCisturnedoff.
Addoffhookdetector，toenable’lengthofconversation’，and’answered/not
answeredcall’logging.
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