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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7637 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
28 lines
854 B
Fortran
28 lines
854 B
Fortran
subroutine chkcrc12(decoded,nbadcrc)
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use crc
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integer*1 decoded(84)
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integer*1, target:: i1Dec8BitBytes(11)
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! Check the CRC
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! Collapse 84 decoded bits to 11 bytes. Bytes 1-9 are the message,
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! byte 10 and first half of byte 11 is the crc
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do ibyte=1,9
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itmp=0
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do ibit=1,8
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itmp=ishft(itmp,1)+iand(1,decoded((ibyte-1)*8+ibit))
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enddo
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i1Dec8BitBytes(ibyte)=itmp
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enddo
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! Pack the crc into bytes 10 and 11 for crc12_check
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i1Dec8BitBytes(10)=decoded(73)*8 + decoded(74)*4 + decoded(75)*2 + decoded(76)
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i1Dec8BitBytes(11)=decoded(77)*128 + decoded(78)*64 + &
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decoded(79)*32 + decoded(80)*16 + decoded(81)*8 + decoded(82)*4 + &
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decoded(83)*2 + decoded(84)
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nbadcrc=1
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if( crc12_check(c_loc (i1Dec8BitBytes), 11) ) nbadcrc=0
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return
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end subroutine chkcrc12
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