mirror of https://github.com/pavel-demin/ft8d.git
43 lines
1.2 KiB
Fortran
43 lines
1.2 KiB
Fortran
subroutine extractmessage174(decoded,msgreceived,msgcall,msggrid,ncrcflag)
|
|
use iso_c_binding, only: c_loc,c_size_t
|
|
use crc
|
|
use packjt
|
|
|
|
character msgreceived*22, msgcall*12, msggrid*4
|
|
character*87 cbits
|
|
integer*1 decoded(87)
|
|
integer*1, target:: i1Dec8BitBytes(11)
|
|
integer*4 i4Dec6BitWords(12)
|
|
|
|
! Write decoded bits into cbits: 75-bit message plus 12-bit CRC
|
|
write(cbits,1000) decoded
|
|
1000 format(87i1)
|
|
read(cbits,1001) i1Dec8BitBytes
|
|
1001 format(11b8)
|
|
read(cbits,1002) ncrc12 !Received CRC12
|
|
1002 format(75x,b12)
|
|
|
|
i1Dec8BitBytes(10)=iand(i1Dec8BitBytes(10),128+64+32)
|
|
i1Dec8BitBytes(11)=0
|
|
icrc12=crc12(c_loc(i1Dec8BitBytes),11) !CRC12 computed from 75 msg bits
|
|
|
|
if(ncrc12.eq.icrc12 .or. sum(decoded(57:87)).eq.0) then !### Kludge ###
|
|
! CRC12 checks out --- unpack 72-bit message
|
|
do ibyte=1,12
|
|
itmp=0
|
|
do ibit=1,6
|
|
itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*6+ibit))
|
|
enddo
|
|
i4Dec6BitWords(ibyte)=itmp
|
|
enddo
|
|
call unpackmsg(i4Dec6BitWords,msgreceived,msgcall,msggrid)
|
|
ncrcflag=1
|
|
else
|
|
msgreceived=' '
|
|
msgcall=' '
|
|
msggrid=' '
|
|
ncrcflag=-1
|
|
endif
|
|
return
|
|
end subroutine extractmessage174
|