92 lines
2.8 KiB
Plaintext
92 lines
2.8 KiB
Plaintext
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subroutine genft8(msg,mygrid,bcontest,msgsent,msgbits,itone)
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! Encode an FT8 message, producing array itone().
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use crc
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use packjt
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include 'ft8_params.f90'
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character*22 msg,msgsent
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character*6 mygrid,g1,g2,g3,g4
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character*87 cbits
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logical*1 bcontest
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logical isgrid
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integer*4 i4Msg6BitWords(12) !72-bit message as 6-bit words
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integer*1 msgbits(KK),codeword(3*ND)
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integer*1, target:: i1Msg8BitBytes(11)
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integer itone(NN)
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integer icos7(0:6)
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data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern
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isgrid(g1)=g1(1:1).ge.'A' .and. g1(1:1).le.'R' .and. g1(2:2).ge.'A' .and. &
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g1(2:2).le.'R' .and. g1(3:3).ge.'0' .and. g1(3:3).le.'9' .and. &
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g1(4:4).ge.'0' .and. g1(4:4).le.'9' .and. g1(1:4).ne.'RR73'
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if(bcontest) then
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i0=index(msg,' R ') + 3 !Check for ' R ' in message
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g1=msg(i0:i0+3)//' '
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if(isgrid(g1)) then !Check for ' R grid'
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call grid2deg(g1,dlong,dlat)
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dlong=dlong+180.0
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if(dlong.gt.180.0) dlong=dlong-360.0
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dlat=-dlat
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call deg2grid(dlong,dlat,g2) !g2=antipodes grid
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msg=msg(1:i0-3)//g2(1:4) !Send message with g2
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endif
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endif
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call packmsg(msg,i4Msg6BitWords,itype) !Pack into 12 6-bit bytes
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call unpackmsg(i4Msg6BitWords,msgsent) !Unpack to get msgsent
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if(bcontest) then
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i1=index(msgsent(8:22),' ') + 8
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g3=msgsent(i1:i1+3)//' '
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if(isgrid(g3)) then
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call azdist(mygrid,g3,0.d0,nAz,nEl,nDmiles,nDkm,nHotAz,nHotABetter)
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if(ndkm.gt.10000) then
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call grid2deg(g3,dlong,dlat)
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dlong=dlong+180.0
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if(dlong.gt.180.0) dlong=dlong-360.0
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dlat=-dlat
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call deg2grid(dlong,dlat,g4)
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msgsent=msgsent(1:i1-1)//'R '//g4(1:4)
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endif
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endif
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endif
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i3bit=0 !### temporary ###
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write(cbits,1000) i4Msg6BitWords,32*i3bit
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1000 format(12b6.6,b8.8)
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read(cbits,1001) i1Msg8BitBytes(1:10)
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1001 format(10b8)
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i1Msg8BitBytes(10)=iand(i1Msg8BitBytes(10),128+64+32)
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i1Msg8BitBytes(11)=0
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icrc12=crc12(c_loc(i1Msg8BitBytes),11)
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! For reference, here's how to check the CRC
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! i1Msg8BitBytes(10)=icrc12/256
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! i1Msg8BitBytes(11)=iand (icrc12,255)
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! checksumok = crc12_check(c_loc (i1Msg8BitBytes), 11)
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! if( checksumok ) write(*,*) 'Good checksum'
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write(cbits,1003) i4Msg6BitWords,i3bit,icrc12
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1003 format(12b6.6,b3.3,b12.12)
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read(cbits,1004) msgbits
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1004 format(87i1)
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call encode174(msgbits,codeword) !Encode the test message
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! Message structure: S7 D29 S7 D29 S7
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itone(1:7)=icos7
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itone(36+1:36+7)=icos7
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itone(NN-6:NN)=icos7
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k=7
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do j=1,ND
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i=3*j -2
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k=k+1
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if(j.eq.30) k=k+7
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itone(k)=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
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enddo
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return
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end subroutine genft8
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