2019-02-10 20:43:51 +00:00
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subroutine chkcrc13a(decoded,nbadcrc)
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use crc
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integer*1 decoded(90)
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integer*1, target:: i1Dec8BitBytes(12)
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character*90 cbits
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! Write decoded bits into cbits: 77-bit message plus 13-bit CRC
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write(cbits,1000) decoded
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1000 format(90i1)
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read(cbits,1001) i1Dec8BitBytes
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1001 format(12b8)
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read(cbits,1002) ncrc13 !Received CRC13
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1002 format(77x,b13)
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i1Dec8BitBytes(10)=iand(i1Dec8BitBytes(10),transfer(128+64+32+16+8,0_1))
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i1Dec8BitBytes(11:12)=0
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icrc13=crc13(c_loc(i1Dec8BitBytes),12) !CRC13 computed from 77 msg bits
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nbadcrc=1
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if(ncrc13.eq.icrc13) nbadcrc=0
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return
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end subroutine chkcrc13a
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