loop.pl

   1 #!/usr/bin/perl
   2 use strict;
   3
   4 use v5.10.1;
   5
   6 use Serial;
   7 use Mojo::IOLoop;
   8 use Mojo::IOLoop::Stream;
   9 use Mojo::JSON  qw(decode_json encode_json);
  10 use Debug;
  11 use SMGLog;
  12
  13 my $devname = "/dev/davis";
  14 my $rain_mult = 0.1;                            # 0.1 or 0.2 mm or 0.01 inches
  15 my $tid;
  16 my $rid;
  17 my $count;
  18 my $state = "ready";
  19 my $buf;
  20 my $dbg;
  21 my $last_reading;
  22
  23 our     @crc_table = (
  24                                   0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  25                                   0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  26                                   0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  27                                   0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  28                                   0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  29                                   0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  30                                   0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  31                                   0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  32                                   0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
  33                                   0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  34                                   0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
  35                                   0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  36                                   0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
  37                                   0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  38                                   0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
  39                                   0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  40                                   0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  41                                   0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  42                                   0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  43                                   0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  44                                   0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  45                                   0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
  46                                   0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  47                                   0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  48                                   0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  49                                   0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
  50                                   0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  51                                   0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
  52                                   0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  53                                   0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
  54                                   0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  55                                   0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0
  56                                  );
  57
  58 our %bar_trend;
  59
  60 $bar_trend{-60} = "Falling Rapidly";
  61 $bar_trend{196} = "Falling Rapidly";
  62 $bar_trend{-20} = "Falling Slowly";
  63 $bar_trend{236} = "Falling Slowly";
  64 $bar_trend{0} = "Steady";
  65 $bar_trend{20} = "Rising Slowly";
  66 $bar_trend{60} = "Rising Rapidly";
  67
  68 #$SIG{TERM} = $SIG{INT} = sub {Mojo::IOLoop->stop if Mojo::IOLoop->is_running && !$DB::VERSION};
  69
  70 my $dlog = SMGLog->new("day");
  71 $dlog->mode('a');
  72
  73 my $s = do_open($devname);
  74 start_loop();
  75
  76 Mojo::IOLoop->recurring(0.1 => sub { $dlog->flushall });
  77
  78 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
  79
  80 exit 0;
  81
  82 sub on_read
  83 {
  84         my ($str, $d) = @_;
  85         $buf .= $d;
  86         $d =~ s/([\%\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
  87 #       say "read added '$d' buf lth=" . length $buf if $dbg;
  88         if ($state eq 'waitnl' && $buf =~ /[\cJ\cM]+/) {
  89                 Mojo::IOLoop->remove($tid);
  90                 undef $buf;
  91                 $s->write("LPS 1 1\n");
  92                 chgstate("waitloop");
  93         } elsif ($state eq "waitloop") {
  94                 if ($buf =~ /\x06/) {
  95                         chgstate('waitlooprec');
  96                         undef $buf;
  97                 }
  98         } elsif ($state eq 'waitlooprec') {
  99                 if (length $buf >= 99) {
 100                         say "got loop record\n" if $dbg;
 101
 102                         chgstate('');
 103                         process($buf);
 104                         undef $buf;
 105                 }
 106         }
 107 }
 108
 109 sub start_loop
 110 {
 111         say "writing \\n" if $dbg;
 112
 113         $s->write("\n");
 114         $tid = Mojo::IOLoop->recurring(0.6 => sub {say "writing \\n" if $dbg; $s->write("\n")});
 115
 116         chgstate("waitnl");
 117 }
 118
 119 sub chgstate
 120 {
 121         say "state '$state' -> '$_[0]'" if $dbg;
 122
 123         $state = $_[0];
 124 }
 125
 126 sub do_open
 127 {
 128         my $name = shift;
 129         my $ob = Serial->new($name, 19200) || die "$name $!\n";
 130         say "streaming $name fileno(", fileno($ob), ")" if $dbg;
 131
 132         my $str = Mojo::IOLoop::Stream->new($ob);
 133         $str->on(error=>sub {say "serial $_[1]"; undef $s; Mojo::IOLoop->reset;});
 134
 135         $str->on(close=>sub {say "serial closing"; undef $s;  Mojo::IOLoop->reset;});
 136         $str->on(timeout=>sub {say "serial timeout";});
 137         $str->on(read=>sub {on_read(@_)});
 138         $str->start;
 139
 140         $rid = Mojo::IOLoop->recurring(2.5 => sub {
 141                                                                            start_loop() if !$state || $state eq "waitnl";
 142                                                                    });
 143
 144         return $str;
 145 }
 146
 147 my $last_time;
 148
 149 sub process
 150 {
 151         my $blk = shift;
 152         my $loo =  substr $blk,0,3;
 153         unless ( $loo eq 'LOO') {
 154                 say "Block invalid loo -> $loo" if $dbg; return;
 155         }
 156
 157         my $t;
 158         my %h;
 159
 160         # Common ones
 161         $h{Pressure_Trend}    = unpack("C", substr $blk,3,1);
 162         $h{Pressure_Trend_txt} = $bar_trend{$h{'Pressure_Trend'}};
 163         $t = unpack("s", substr $blk,7,2) / 1000;
 164         $h{Pressure} = sprintf("%.0f",in2mb($t))+0;
 165
 166         $t = unpack("s", substr $blk,9,2) / 10;
 167         $h{Temp_In} = sprintf("%.1f", f2c($t))+0;
 168
 169         $t  = unpack("s", substr $blk,12,2) / 10;
 170         $h{Temp_Out}  = sprintf("%.1f", f2c($t))+0;
 171
 172         $t = unpack("C", substr $blk,14,1);
 173         $h{Wind} = sprintf("%.1f",mph2mps($t))+0;
 174         $h{Dir}     = unpack("s", substr $blk,16,2)+0;
 175
 176
 177         $h{'Humidity_Out'} = unpack("C", substr $blk,33,1)+0;
 178         $h{'Humidity_In'}  = unpack("C", substr $blk,11,1)+0;
 179
 180         $t = unpack("C", substr $blk,43,1)+0;
 181         $h{'UV'} = $t unless $t >= 255;
 182         $t = unpack("s", substr $blk,44,2)+0;   # watt/m**2
 183         $h{'Solar'} = $t unless $t >= 32767;
 184
 185         $h{'Rain_Rate'}  = sprintf("%0.1f",unpack("s", substr $blk,41,2) * $rain_mult)+0;
 186         $h{'Rain_Day'}   = sprintf("%0.1f", unpack("s", substr $blk,50,2) * $rain_mult)+0;
 187
 188         # what sort of packet is it?
 189
 190         $t =  unpack("C", substr $blk,4,1);
 191         if ($t) {
 192
 193                 # Newer LOOP2 packet
 194                 $t = unpack("C", substr $blk,18,2);
 195                 $h{Wind_Avg_10} = sprintf("%.1f",mph2mps($t/10))+0;
 196                 $t = unpack("C", substr $blk,20,2);
 197                 $h{Wind_Avg_2} = sprintf("%.1f",mph2mps($t/10))+0;
 198                 $t = unpack("C", substr $blk,22,2);
 199                 $h{Wind_Gust_10} = sprintf("%.1f",mph2mps($t/10))+0;
 200
 201                 $h{Dir_Avg_10} = unpack("C", substr $blk,24,2)+0;
 202                 $t = unpack("C", substr $blk,30,2);
 203                 $h{Dew_Point} = sprintf("%0.1f", f2c($t))+0;
 204
 205         } else {
 206
 207                 # Older LOOP packet
 208                 $t = unpack("C", substr $blk,15,1);
 209                 $h{Wind_Avg_10} = sprintf("%.1f",mph2mps($t))+0;
 210                 $h{'Dew_Point'}  = sprintf("%0.1f", dew_point($h{Temp_Out}, $h{'Humidity_Out'}))+0;
 211
 212                 $h{'Rain_Month'}  = sprintf("%0.1f", unpack("s", substr $blk,52,2) * $rain_mult)+0;
 213                 $h{'Rain_Year'}  = sprintf("%0.1f", unpack("s", substr $blk,54,2) * $rain_mult)+0;
 214
 215
 216                 $h{'Batt_TX_OK'}  = (unpack("C", substr $blk,86,1)+0) ^ 1;
 217                 $h{'Batt_Console'}  = sprintf("%0.2f", unpack("s", substr $blk,87,2) * 0.005859375)+0;
 218                 $h{'Forecast_Icon'}  = unpack("C", substr $blk,89,1);
 219                 $h{'Forecast_Rule'}  = unpack("C", substr $blk,90,1);
 220
 221                 $h{'Sunrise'}  = sprintf( "%04d", unpack("S", substr $blk,91,2) );
 222                 $h{'Sunrise'}  =~ s/(\d{2})(\d{2})/$1:$2/;
 223                 $h{'Sunset'}   = sprintf( "%04d", unpack("S", substr $blk,93,2) );
 224                 $h{'Sunset'}  =~ s/(\d{2})(\d{2})/$1:$2/;
 225         }
 226
 227         my $crc = unpack "%n", substr($blk,97,2);
 228         my $crc_calc = CRC_CCITT($blk);
 229
 230         if ($crc_calc==0) {
 231                 my $o = gen_hash_diff($last_reading, \%h);
 232                 $last_reading = \%h;
 233                 my $t = time;
 234                 my $j;
 235                 my $s;
 236                 if ($t >= $last_time + 60) {
 237                         $j = encode_json(\%h);
 238                         $s = qq|{"t":$t,"m":$j}|;
 239                         $last_time = $t;
 240                 } elsif ($o) {
 241                         $j = encode_json($o);
 242                         $s = qq|{"t":$t,"r":$j}|;
 243                 }
 244                 if ($s) {
 245                         say $s;
 246                         $dlog->writenow($s);
 247                 }
 248         } else {
 249                 say "CRC check failed for LOOP data!";
 250                 return 1;
 251         }
 252 }
 253
 254 sub gen_hash_diff
 255 {
 256         my $last = shift;
 257         my $now = shift;
 258         my %o;
 259         my $count;
 260
 261         while (my ($k, $v) = each %$now) {
 262                 if ($last->{$k} ne $now->{$k}) {
 263                         $o{$k} = $v;
 264                         ++$count;
 265                 }
 266         }
 267         return $count ? \%o : undef;
 268 }
 269
 270 sub dew_point
 271 {
 272         my $temp = shift @_;
 273         my $rh   = shift @_;
 274
 275         #  Using the simplified approximation for dew point
 276         #  Accurate to 1 degree C for humidities > 50 %
 277         #  http://en.wikipedia.org/wiki/Dew_point
 278
 279         my $dewpoint = $temp - ((100 - $rh) / 5);
 280
 281         # this is the more complete one (which doesn't work)
 282         #my $a = 6.1121;
 283         #my $b = 18.678;
 284         #my $c = 257.14;
 285         #my $ytrh = log(($rh/100) + ($b * $temp) / ($c + $temp));
 286         #my $dewpoint = ($c * $ytrh) / ($b - $ytrh);
 287
 288         return $dewpoint;
 289 }
 290
 291 sub CRC_CCITT
 292 {
 293     # Expects packed data...
 294     my $data_str = shift @_;
 295
 296         my $crc = 0;
 297         my @lst = split //, $data_str;
 298         foreach my $data (@lst) {
 299                 my $data = unpack("c",$data);
 300
 301                 my $crc_prev = $crc;
 302                 my $index = $crc >> 8 ^ $data;
 303                 my $lhs = $crc_table[$index];
 304                 #print "lhs=$lhs, crc=$crc\n";
 305                 my $rhs = ($crc << 8) & 0xFFFF;
 306                 $crc = $lhs ^ $rhs;
 307
 308
 309         }
 310
 311         return $crc;
 312 }
 313
 314 sub f2c
 315 {
 316         return ($_[0] - 32) * 5/9;
 317 }
 318
 319 sub mph2mps
 320 {
 321         return $_[0] * 0.44704;
 322 }
 323
 324 sub in2mb
 325 {
 326         return $_[0] * 33.8637526;
 327 }