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https://github.com/fhgwright/SCSI2SD.git
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49 lines
1.5 KiB
Perl
49 lines
1.5 KiB
Perl
#!/usr/bin/perl -w
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# Copyright (C) 2014 Michael McMaster <michael@codesrc.com>
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#
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# This file is part of SCSI2SD.
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#
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# SCSI2SD is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# SCSI2SD is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with SCSI2SD. If not, see <http://www.gnu.org/licenses/>.
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# Calculates the checksum of all flash data within Cypress PSoC 5lp .hex files
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# Allows fixing the checksum after manual hacking of the hex files
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use strict;
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use warnings;
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my $sum = 0;
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while (my $line = <>)
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{
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$line =~ s/[\n\r]//g;
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if ($line =~ /^:40[0-9A-F]{4}00(.+)[0-9A-F]{2}$/)
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{
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my $binrec = pack('H*', $1);
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$sum += unpack('%16C*', $binrec);
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}
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elsif ($line eq ":0200000490303A")
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{
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my $checksumRec = sprintf(":02000000%04X", ($sum & 0xffff));
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# create checksum of checksum record.
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my $sum2 = unpack('%8C*', pack('H*', substr($checksumRec, 1)));
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$checksumRec .= sprintf('%2X', (~$sum2 + 1) & 0xFF);
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print("Flash data checksum record = $checksumRec\n");
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print("(Replace line below ':0200000490303A'\n");
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exit;
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}
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}
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