WSJT-X/lib/ft8/ft8code.f90

126 lines
3.9 KiB
Fortran
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program ft8code
! Provides examples of message packing, LDPC(144,87) encoding, bit and
! symbol ordering, and other details of the FT8 protocol.
use packjt
use crc
include 'ft8_params.f90' !Set various constants
include 'ft8_testmsg.f90'
parameter (NWAVE=NN*NSPS)
character*40 msg,msgchk
character*37 msg37
character*6 c1,c2
character*9 comment
character*22 msgsent,message
character*6 mygrid6
character bad*1,msgtype*10
character*87 cbits
integer itone(NN)
integer dgen(12)
integer*1 msgbits(KK),decoded(KK),decoded0(KK)
data mygrid6/'EM48 '/
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.1 .and. nargs.ne.3) then
print*
print*,'Program ft8code: Provides examples of message packing, ', &
'LDPC(174,87) encoding,'
print*,'bit and symbol ordering, and other details of the FT8 protocol.'
print*
print*,'Usage: ft8code [-c grid] "message" # Results for specified message'
print*,' ft8code -t # Examples of all message types'
go to 999
endif
call getarg(1,msg) !Message to be transmitted
if(len(trim(msg)).eq.2 .and. msg(1:2).eq.'-t') then
testmsg(NTEST+1)='KA1ABC RR73; WB9XYZ <KH1/KH7Z> -11'
nmsg=NTEST+1
else
msgchk=msg
call fmtmsg(msgchk,iz) !To upper case; collapse multiple blanks
nmsg=1
endif
write(*,1010)
1010 format(" Message Decoded Err? Type"/76("-"))
do imsg=1,nmsg
if(nmsg.gt.1) msg=testmsg(imsg)
call fmtmsg(msg,iz) !To upper case, collapse multiple blanks
msgchk=msg
! Generate msgsent, msgbits, and itone
if(index(msg,';').le.0) then
call packmsg(msg(1:22),dgen,itype)
msgtype=""
if(itype.eq.1) msgtype="Std Msg"
if(itype.eq.2) msgtype="Type 1 pfx"
if(itype.eq.3) msgtype="Type 1 sfx"
if(itype.eq.4) msgtype="Type 2 pfx"
if(itype.eq.5) msgtype="Type 2 sfx"
if(itype.eq.6) msgtype="Free text"
i3bit=0
call genft8(msg(1:22),mygrid6,i3bit,msgsent,msgbits,itone)
else
call foxgen_wrap(msg,msgbits,itone)
i3bit=1
endif
decoded=msgbits
i3bit=4*decoded(73) + 2*decoded(74) + decoded(75)
iFreeText=decoded(57)
decoded0=decoded
if(i3bit.eq.1) decoded(57:)=0
call extractmessage174(decoded,message,ncrcflag)
decoded=decoded0
if(i3bit.eq.0) then
bad=" "
comment=' '
if(itype.ne.6 .and. message.ne.msgchk) bad="*"
if(itype.eq.6 .and. message(1:13).ne.msgchk(1:13)) bad="*"
if(itype.eq.6 .and. len(trim(msgchk)).gt.13) comment='truncated'
write(*,1020) imsg,msgchk,message,bad,i3bit,itype,msgtype,comment
1020 format(i2,'.',1x,a22,1x,a22,1x,a1,2i2,1x,a10,1x,a9)
else
write(cbits,1001) decoded
1001 format(87i1)
read(cbits,1002) nrpt
1002 format(66x,b6)
irpt=nrpt-30
i1=index(message,' ')
i2=index(message(i1+1:),' ') + i1
c1=message(1:i1)//' '
c2=message(i1+1:i2)//' '
msg37=c1//' RR73; '//c2//' <...> '
write(msg37(35:37),1003) irpt
1003 format(i3.2)
if(msg37(35:35).ne.'-') msg37(35:35)='+'
iz=len(trim(msg37))
do iter=1,10 !Collapse multiple blanks into one
ib2=index(msg37(1:iz),' ')
if(ib2.lt.1) exit
msg37=msg37(1:ib2)//msg37(ib2+2:)
iz=iz-1
enddo
write(*,1021) imsg,msgchk,msg37
1021 format(i2,'.',1x,a40,1x,a37)
endif
enddo
if(nmsg.eq.1) then
write(*,1030) msgbits(1:56)
1030 format(/'Call1: ',28i1,' Call2: ',28i1)
write(*,1032) msgbits(57:72),msgbits(73:75),msgbits(76:87)
1032 format('Grid: ',16i1,' 3Bit: ',3i1,' CRC12: ',12i1)
write(*,1034) itone
1034 format(/'Channel symbols:'/79i1)
endif
999 end program ft8code