use Data::Dump qw(dump);
use Device::SerialPort qw(:STAT);
+my $debug = $ENV{DEBUG} || 0;
+
my $port = Device::SerialPort->new('/dev/ttyUSB0');
$port->baudrate(9600);
$port->databits(8);
$port->stopbits(1);
$port->handshake('none');
-# disable timeouts
$port->read_char_time(500);
$port->read_const_time(1000);
+sub as_hex {
+ my @out;
+ foreach my $str ( @_ ) {
+ my $hex = uc unpack( 'H*', $str );
+ $hex =~ s/(..)/$1 /g if length( $str ) > 2;
+ $hex =~ s/\s+$//;
+ push @out, $hex;
+ }
+ return join(' | ', @out);
+}
+
+sub hex2bytes {
+ my $bytes;
+ $bytes .= pack('C', hex('0x' . $_)) foreach split(/\s+/,join(' ',@_));
+ return $bytes;
+}
+
+sub crc {
+ my $data = shift;
+ my $crc = 0;
+ for my $i ( 0 .. length($data) - 2 ) {
+ if ( $crc & 0x80 ) {
+ $crc = ( $crc << 1 ) ^ 25;
+ } else {
+ $crc = $crc << 1;
+ }
+ $crc = $crc & 0xff;
+ my $byte = ord(substr($data,$i,1));
+ $crc = $crc ^ $byte;
+# warn "## ", as_hex(chr($byte)), " crc = ", $crc, " ", as_hex(chr($crc));
+ }
+ if ( chr($crc) ne substr($data,-1,1) ) {
+ warn "CRC error for ",as_hex($data), " calulated ", as_hex(chr($crc));
+ }
+}
+
sub v {
my ($hex,$desc) = @_;
- my $bytes;
- $bytes .= pack('C', hex('0x' . $_)) foreach split(/\s+/,$hex);
+ my $bytes = hex2bytes( $hex );
warn "# $desc\n";
- warn ">> $hex ",dump( $bytes );
+retry:
+ warn ">> ",as_hex( $bytes );
+ crc( $bytes );
$port->write( $bytes );
- my $len = $port->read(1);
- warn "<< len: ",ord($len);
- my $data = $port->read(ord($len) - 1);
- warn "<< ",dump($data);
+ my $data = $port->read(1);
+ warn "<< len: ",ord($data) if $debug;
+
+ goto retry if ord($data) == 0;
+
+ $data .= $port->read(ord($data) - 1);
+ crc($data);
+ warn "<< ",as_hex($data);
}
v '07 02 00 00 00 04 C4', "hardware version";
+v '07 0A 00 00 00 04 44', 'software version';
+
+v '07 00 01 00 06 0E EA', 'temperatures';
+
+v '07 00 00 00 26 0A A6', 'last errros';
+
+v '07 00 00 00 26 00 AC', 'last errros (with invalid length)';