WSJT-X/lib/ft8/chkcrc14a.f90

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Fortran
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subroutine chkcrc14a(decoded,nbadcrc)
use crc
integer*1 decoded(91)
integer*1, target:: i1Dec8BitBytes(12)
character*91 cbits
! Write decoded bits into cbits: 77-bit message plus 14-bit CRC
write(cbits,1000) decoded
1000 format(91i1)
read(cbits,1001) i1Dec8BitBytes
1001 format(12b8)
read(cbits,1002) ncrc14 !Received CRC14
1002 format(77x,b14)
i1Dec8BitBytes(10)=iand(i1Dec8BitBytes(10),128+64+32+16+8)
i1Dec8BitBytes(11:12)=0
icrc14=crc14(c_loc(i1Dec8BitBytes),12) !CRC14 computed from 77 msg bits
nbadcrc=1
if(ncrc14.eq.icrc14) nbadcrc=0
return
end subroutine chkcrc14a