2018-02-08 21:28:33 -05:00
|
|
|
subroutine genft8(msg,mygrid,bcontest,i3bit,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*87 cbits
|
2018-08-05 11:33:30 -04:00
|
|
|
logical bcontest,checksumok
|
2018-02-08 21:28:33 -05:00
|
|
|
integer*4 i4Msg6BitWords(12) !72-bit message as 6-bit words
|
|
|
|
|
integer*1 msgbits(KK),codeword(3*ND)
|
|
|
|
|
integer*1, target:: i1Msg8BitBytes(11)
|
|
|
|
|
integer itone(NN)
|
|
|
|
|
integer icos7(0:6)
|
|
|
|
|
data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern
|
|
|
|
|
|
|
|
|
|
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,32*i3bit
|
|
|
|
|
1000 format(12b6.6,b8.8)
|
|
|
|
|
read(cbits,1001) i1Msg8BitBytes(1:10)
|
|
|
|
|
1001 format(10b8)
|
|
|
|
|
i1Msg8BitBytes(10)=iand(i1Msg8BitBytes(10),128+64+32)
|
|
|
|
|
i1Msg8BitBytes(11)=0
|
|
|
|
|
icrc12=crc12(c_loc(i1Msg8BitBytes),11)
|
|
|
|
|
|
|
|
|
|
! For reference, here's how to check the CRC
|
|
|
|
|
! i1Msg8BitBytes(10)=icrc12/256
|
|
|
|
|
! i1Msg8BitBytes(11)=iand (icrc12,255)
|
|
|
|
|
! checksumok = crc12_check(c_loc (i1Msg8BitBytes), 11)
|
|
|
|
|
! if( checksumok ) write(*,*) 'Good checksum'
|
|
|
|
|
|
|
|
|
|
write(cbits,1003) i4Msg6BitWords,i3bit,icrc12
|
|
|
|
|
1003 format(12b6.6,b3.3,b12.12)
|
|
|
|
|
read(cbits,1004) msgbits
|
|
|
|
|
1004 format(87i1)
|
|
|
|
|
|
|
|
|
|
call encode174(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
|
|
|
|
|
itone(k)=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
|
|
|
|
|
enddo
|
|
|
|
|
|
|
|
|
|
return
|
|
|
|
|
end subroutine genft8
|
