WSJT-X/lib/ft8/genft8_174_91.f90

56 lines
1.5 KiB
Fortran

subroutine genft8_174_91(msg,mygrid,bcontest,i5bit,msgsent,msgbits,itone)
! Encode an FT8 message, producing array itone().
use crc
use packjt
include 'ft8_params.f90'
character*22 msg,msgsent
character*6 mygrid
character*91 cbits
logical bcontest,checksumok
integer*4 i4Msg6BitWords(12) !72-bit message as 6-bit words
integer*1 msgbits(91),codeword(174)
integer*1, target:: i1Msg8BitBytes(12)
integer itone(79)
integer icos7(0:6)
integer graymap(0:7)
data icos7/3,1,4,0,6,5,2/ !Costas 7x7 tone pattern
data graymap/0,1,3,2,7,6,4,5/
call packmsg(msg,i4Msg6BitWords,itype,bcontest) !Pack into 12 6-bit bytes
call unpackmsg(i4Msg6BitWords,msgsent,bcontest,mygrid) !Unpack to get msgsent
write(cbits,1000) i4Msg6BitWords,8*i5bit
1000 format(12b6.6,b8.8)
read(cbits,1001) i1Msg8BitBytes(1:10)
1001 format(10b8)
i1Msg8BitBytes(10)=iand(i1Msg8BitBytes(10),128+64+32+16+8)
i1Msg8BitBytes(11:12)=0
icrc14=crc14(c_loc(i1Msg8BitBytes),12)
i1Msg8BitBytes(11)=icrc14/256
i1Msg8BitBytes(12)=iand (icrc14,255)
write(cbits,1003) i4Msg6BitWords,i5bit,icrc14
1003 format(12b6.6,b5.5,b14.14)
read(cbits,1004) msgbits
1004 format(91i1)
call encode174_91(msgbits,codeword) !Encode the test message
! Message structure: S7 D29 S7 D29 S7
itone(1:7)=icos7
itone(36+1:36+7)=icos7
itone(NN-6:NN)=icos7
k=7
do j=1,ND
i=3*j -2
k=k+1
if(j.eq.30) k=k+7
indx=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
itone(k)=graymap(indx)
enddo
return
end subroutine genft8_174_91