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#!/usr/bin/perl
use strict;
use warnings;
use HiPi qw( :rpi :mfrc522);
use HiPi::Interface::MFRC522;
# some clone cards allow a simple write to block 0
# and don't require the 'backdoor' method
# see examples/write_uid_block.pl
my $resetpin = RPI_PIN_38; # the pin connected to reset
my $rfid = HiPi::Interface::MFRC522->new( reset_pin => $resetpin, devicename => '/dev/spidev0.1' );
my $key = $rfid->get_default_key; # change if you changed it
my $uidswritten = {}; # keep a record of if we have written to a tag in current invocation
my $newuid = [ 0x23, 0xCF, 0xC9, 0x3C ]; # uid should be the same size as the one it is replacing
my $uidsize = scalar( @$newuid );
my $newuidstring = '';
for (my $i = 0; $i < $uidsize; $i ++ ) {
$newuidstring .= '-' if $newuidstring;
$newuidstring .= sprintf('%02X', $newuid->[$i]);
}
sub handle_change_uid {
my( $uid, $uidstring) = @_;
print qq(Tag ID : $uidstring\n);
my $picctype = $rfid->picc_get_type( $uid->{'sak'} );
my $piccname = $rfid->picc_get_type_name( $picctype );
print qq(Tag Type : $piccname\n);
my $continue = 1;
unless( $uidsize == $uid->{'size'} ) {
print qq(new uid is $uidsize bytes but existing uid is $uid->{'size'} bytes\n\n);
$rfid->picc_end_session;
return $continue;
}
if( $newuidstring eq $uidstring ) {
print qq(Tag already has UID $newuidstring\n);
my ( $uidstatus, $uidblockdata ) = $rfid->read_block_data( 0, $uid, $key );
if( $uidstatus == MFRC522_STATUS_OK ) {
my $bldata = '';
for my $byte ( @$uidblockdata ) {
$bldata .= ' ' if $bldata;
$bldata .= sprintf('%02X', $byte);
}
print qq(Tag Block 0 : $bldata\n\n);
} else {
print qq(\n);
}
$rfid->picc_end_session;
return $continue;
}
if( $rfid->mifare_set_uid( $uid, $newuid, $key ) ) {
print qq(Tag UID set to $newuidstring\n\n);
} else {
print qq(Failed to set UID for tag $uidstring\n\n);
}
$rfid->picc_end_session;
return $continue;
}
$rfid->scan( \&handle_change_uid );
1;
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