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);
$port->handshake('none');
-$port->read_char_time(1000);
-$port->read_const_time(3000);
+$port->read_char_time(500);
+$port->read_const_time(1000);
sub as_hex {
my @out;
return $bytes;
}
-sub v {
- my ($hex,$expect,$desc) = @_;
- my $bytes = hex2bytes( $hex );
+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));
+ }
+ # ignore checksum errors for FF, we will calulate them!
+ if ( chr($crc) ne substr($data,-1,1) && substr($data,-1,1) ne "\xFF" ) {
+ warn "CRC error for ",as_hex($data), " calulated ", as_hex(chr($crc));
+ }
+
+ return substr($data,0,-1) . chr($crc);
+}
+
+sub v_bytes {
+ my ($bytes,$desc) = @_;
warn "# $desc\n";
+retry:
warn ">> ",as_hex( $bytes );
+ crc( $bytes );
$port->write( $bytes );
my $data = $port->read(1);
- warn "<< len: ",ord($data);
+ warn "<< len: ",ord($data) if $debug;
+
+ goto retry if ord($data) == 0;
+
$data .= $port->read(ord($data) - 1);
+ crc($data);
warn "<< ",as_hex($data);
- warn "?? $expect\n" if $expect;
+ return $data;
+}
+
+sub v {
+ my ($hex,$desc) = @_;
+ v_bytes( hex2bytes( $hex ), $desc );
}
-#v '07 02 00 00 00 04 C4', "hardware version";
+if ( ! @ARGV ) {
+ v '07 02 00 00 00 04 C4', "hardware version";
-#v '07 0A 00 00 00 04 44', 'software version';
+ v '07 0A 00 00 00 04 44', 'software version';
-v '07 00 01 00 06 0E EA', 'temperatures';
+ 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)';
+
+foreach my $reg ( @ARGV ) {
+ warn "# send user $reg\n";
+ v_bytes(
+ crc( hex2bytes( "07 00 00 00 $reg 01 FF" ) )
+ ,"user: $reg");
+}