49 lines
1.5 KiB
Fortran
49 lines
1.5 KiB
Fortran
|
subroutine extractmessage168(decoded,msgreceived,ncrcflag,recent_calls,nrecent)
|
||
|
|
use iso_c_binding, only: c_loc,c_size_t
|
||
|
|
use crc
|
||
|
|
use packjt
|
||
|
|
|
||
|
|
character*22 msgreceived
|
||
|
|
character*12 call1,call2
|
||
|
|
character*12 recent_calls(nrecent)
|
||
|
|
integer*1 decoded(84)
|
||
|
|
integer*1, target:: i1Dec8BitBytes(11)
|
||
|
|
integer*4 i4Dec6BitWords(12)
|
||
|
|
|
||
|
|
! Collapse 84 decoded bits to 11 bytes. Bytes 1-9 are the message, byte 10 and first half of byte 11 is the crc
|
||
|
|
do ibyte=1,9
|
||
|
|
itmp=0
|
||
|
|
do ibit=1,8
|
||
|
|
itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
|
||
|
|
enddo
|
||
|
|
i1Dec8BitBytes(ibyte)=itmp
|
||
|
|
enddo
|
||
|
|
! Need to pack the crc into bytes 10 and 11 for crc12_check
|
||
|
|
i1Dec8BitBytes(10)=decoded(73)*8+decoded(74)*4+decoded(75)*2+decoded(76)
|
||
|
|
i1Dec8BitBytes(11)=decoded(77)*128+decoded(78)*64+decoded(79)*2*32+decoded(80)*16
|
||
|
|
i1Dec8BitBytes(11)=i1Dec8BitBytes(11)+decoded(81)*8+decoded(82)*4+decoded(83)*2+decoded(84)
|
||
|
|
|
||
|
|
if( crc12_check(c_loc (i1Dec8BitBytes), 11) ) then
|
||
|
|
! 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 unpackmsg144(i4Dec6BitWords,msgreceived,call1,call2)
|
||
|
|
ncrcflag=1
|
||
|
|
if( call1(1:2) .ne. 'CQ' .and. call1(1:2) .ne. ' ' ) then
|
||
|
|
call update_recent_calls(call1,recent_calls,nrecent)
|
||
|
|
endif
|
||
|
|
if( call2(1:2) .ne. ' ' ) then
|
||
|
|
call update_recent_calls(call2,recent_calls,nrecent)
|
||
|
|
endif
|
||
|
|
else
|
||
|
|
msgreceived=' '
|
||
|
|
ncrcflag=-1
|
||
|
|
endif
|
||
|
|
return
|
||
|
|
end subroutine extractmessage168
|