mips_sys

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#! /usr/bin/perl
use strict;
use warnings;
require("crc32.pl");
# parse eth TX log data
my @nibbles = ();
while (my $line = <>) {
  chomp $line;
  # ethernet TX log
  if ($line =~ /^ethernet TX: ([0-9]+)$/) {
    my $nibble = $1;
    push (@nibbles, $nibble & 0x0F);
  }
  # VHDL data
  elsif ($line =~ /^ *([0-9A-FXa-fx", ]+)/) {
    my $data = $1;
    for my $part (split(/,/, $data)) {
      if ($part =~ /^ *[xX]"([0-9A-Fa-f])"/) {
        my $val = $1;
        push (@nibbles, hex($val));
      }
    }
  }
}
# nibbles to bytes
my @bytes = ();
for (my $i = 0; $i < @nibbles; $i += 2) {
  my $byte = $nibbles[$i + 1] << 4 | $nibbles[$i];
  push (@bytes, $byte);
}
# remove preamble
my $pos = 0;
while ($pos < @bytes && $bytes[$pos] == 0x55) {
  $pos++;
}
if ($pos > 4 && $pos < @bytes && $bytes[$pos] == 0xD5) {
  $pos++;
  for ( ; $pos > 0; $pos--) {
    shift(@bytes);
  }
} else {
  print STDERR "warning: preamble not found -> not removed\n";
}
# remove CRC
if (@bytes >= 4) {
 
 
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