/[RFID]/3m-810.pl
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 6 by dpavlin, Sun Sep 28 18:19:37 2008 UTC revision 15 by dpavlin, Thu Oct 2 21:20:10 2008 UTC
# Line 39  L<Device::SerialPort(3)> Line 39  L<Device::SerialPort(3)>
39    
40  L<perl(1)>  L<perl(1)>
41    
42    L<http://stackoverflow.com/questions/149617/how-could-i-guess-a-checksum-algorithm>
43    
44  =head1 AUTHOR  =head1 AUTHOR
45    
46  Dobrica Pavlinusic <dpavlin@rot13.org> L<http://www.rot13.org/~dpavlin/>  Dobrica Pavlinusic <dpavlin@rot13.org> L<http://www.rot13.org/~dpavlin/>
# Line 103  dispatch( Line 105  dispatch(
105    
106                          my @tags;                          my @tags;
107                          push @tags, substr($tags, $_ * 8, 8) foreach ( 0 .. $nr - 1 );                          push @tags, substr($tags, $_ * 8, 8) foreach ( 0 .. $nr - 1 );
108                          warn "## tags ",as_hex($tags), " [$tl] = ",dump( $tags );                          warn "## tags ",as_hex($tags), " [$tl] = ",dump( $tags ) if $debug;
109                          print "seen $nr tags: ", join(',', map { unpack('H16', $_) } @tags ) , "\n";                          print "seen $nr tags: ", join(',', map { unpack('H16', $_) } @tags ) , "\n";
110                  }                  }
111  ) }  ) }
# Line 161  sub as_hex { Line 163  sub as_hex {
163          foreach my $str ( @_ ) {          foreach my $str ( @_ ) {
164                  my $hex = unpack( 'H*', $str );                  my $hex = unpack( 'H*', $str );
165                  $hex =~ s/(..)/$1 /g if length( $str ) > 2;                  $hex =~ s/(..)/$1 /g if length( $str ) > 2;
166                    $hex =~ s/\s+$//;
167                  push @out, $hex;                  push @out, $hex;
168          }          }
169          return join('  ', @out);          return join(' | ', @out);
170  }  }
171    
172  sub read_bytes {  sub read_bytes {
# Line 218  sub dispatch { Line 221  sub dispatch {
221          }          }
222  }  }
223    
224    use Digest::CRC;
225    
226    sub crcccitt {
227            my $bytes = shift;
228            my $crc = Digest::CRC->new(
229                    # midified CCITT to xor with 0xffff instead of 0x0000
230                    width => 16, init => 0xffff, xorout => 0xffff, refout => 0, poly => 0x1021, refin => 0,
231            ) or die $!;
232            $crc->add( $bytes );
233            pack('n', $crc->digest);
234    }
235    
236    # my $checksum = checksum( $bytes );
237    # my $checksum = checksum( $bytes, $original_checksum );
238    sub checksum {
239            my ( $bytes, $checksum ) = @_;
240    
241            my $xor = crcccitt( substr($bytes,1) ); # skip D6
242            warn "## checksum ",dump( $bytes, $xor, $checksum ) if $debug;
243    
244            if ( defined $checksum && $xor ne $checksum ) {
245                    print "checksum doesn't match: ", as_hex($xor), " != ", as_hex($checksum), " data: ", as_hex($bytes), "\n";
246            }
247    }
248    
249  sub readchunk {  sub readchunk {
250          my ( $parser ) = @_;          my ( $parser ) = @_;
251    
# Line 228  sub readchunk { Line 256  sub readchunk {
256          my $length = read_bytes( 1, 'length' );          my $length = read_bytes( 1, 'length' );
257          my $len = ord($length);          my $len = ord($length);
258          my $data = read_bytes( $len, 'data' );          my $data = read_bytes( $len, 'data' );
         my ( $cmd ) = unpack('C', $data );  
259    
260          my $payload  = substr( $data, 0, -2 );          my $payload  = substr( $data, 0, -2 );
261          my $payload_len = length($data);          my $payload_len = length($data);
262          warn "## payload too short $payload_len != $len\n" if $payload_len != $len;          warn "## payload too short $payload_len != $len\n" if $payload_len != $len;
263    
264          my $checksum = substr( $data, -2, 2 );          my $checksum = substr( $data, -2, 2 );
265          # FIXME check checksum          checksum( $header . $length . $payload, $checksum );
266    
267          print "<< ",as_hex( $header ), " [$len] ", as_hex( $payload ), "checksum: ", as_hex( $checksum ),"\n";          print "<< ",as_hex( $header ), " [$len] ", as_hex( $payload ), " | sum: ",as_hex($checksum),"\n";
268    
269          $assert->{len}      = $len;          $assert->{len}      = $len;
270          $assert->{payload}  = $payload;          $assert->{payload}  = $payload;
         $assert->{checksum} = $checksum;  
271    
272          $parser->( $len, $payload, $checksum ) if $parser && ref($parser) eq 'CODE';          $parser->( $len, $payload ) if $parser && ref($parser) eq 'CODE';
273    
274          return $data;          return $data;
275  }  }
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