loop.pl

   1 #!/usr/bin/perl
   2 use strict;
   3
   4 use v5.10.1;
   5
   6 use DBI;
   7 use Serial;
   8 use Mojo::IOLoop;
   9 use Mojo::IOLoop::Stream;
  10 use Mojo::JSON  qw(decode_json encode_json);
  11
  12 my $devname = "/dev/davis";
  13 my $rain_mult = 0.1;                            # 0.1 or 0.2 mm or 0.01 inches
  14 my $tid;
  15 my $rid;
  16 my $count;
  17 my $state = "ready";
  18 my $buf;
  19 my $dbg;
  20 my $last_reading;
  21
  22 our     @crc_table = (
  23                                   0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  24                                   0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  25                                   0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  26                                   0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  27                                   0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  28                                   0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  29                                   0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  30                                   0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  31                                   0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
  32                                   0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  33                                   0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
  34                                   0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  35                                   0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
  36                                   0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  37                                   0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
  38                                   0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  39                                   0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  40                                   0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  41                                   0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  42                                   0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  43                                   0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  44                                   0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
  45                                   0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  46                                   0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  47                                   0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  48                                   0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
  49                                   0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  50                                   0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
  51                                   0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  52                                   0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
  53                                   0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  54                                   0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0
  55                                  );
  56
  57 our %bar_trend;
  58
  59 $bar_trend{-60} = "Falling Rapidly";
  60 $bar_trend{196} = "Falling Rapidly";
  61 $bar_trend{-20} = "Falling Slowly";
  62 $bar_trend{236} = "Falling Slowly";
  63 $bar_trend{0} = "Steady";
  64 $bar_trend{20} = "Rising Slowly";
  65 $bar_trend{60} = "Rising Rapidly";
  66
  67 #$SIG{TERM} = $SIG{INT} = sub {Mojo::IOLoop->stop if Mojo::IOLoop->is_running && !$DB::VERSION};
  68
  69 my $s = do_open($devname);
  70 start_loop();
  71
  72 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
  73
  74 $s->close;
  75
  76 exit 0;
  77
  78 sub on_read
  79 {
  80         my ($str, $d) = @_;
  81         $buf .= $d;
  82         $d =~ s/([\%\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
  83 #       say "read added '$d' buf lth=" . length $buf if $dbg;
  84         if ($state eq 'waitnl' && $buf =~ /[\cJ\cM]+/) {
  85                 undef $tid;
  86                 undef $buf;
  87                 $s->write("LOOP 1\n");
  88                 chgstate("waitloop");
  89         } elsif ($state eq "waitloop") {
  90                 if ($buf =~ /\x06/) {
  91                         chgstate('waitlooprec');
  92                         undef $buf;
  93                 }
  94         } elsif ($state eq 'waitlooprec') {
  95                 if (length $buf >= 99) {
  96                         say "got loop record\n" if $dbg;
  97
  98                         chgstate('');
  99                         process($buf);
 100                         undef $buf;
 101                 }
 102         }
 103 }
 104
 105 sub start_loop
 106 {
 107         say "writing \\n" if $dbg;
 108
 109         $s->write("\n");
 110         $tid = Mojo::IOLoop->timer(0.6 => sub {say "writing \\n" if $dbg; $s->write("\n")});
 111
 112         chgstate("waitnl");
 113 }
 114
 115 sub chgstate
 116 {
 117         say "state '$state' -> '$_[0]'" if $dbg;
 118
 119         $state = $_[0];
 120 }
 121
 122 sub do_open
 123 {
 124         my $name = shift;
 125         my $ob = Serial->new($name, 19200) || die "$name $!\n";
 126         say "streaming $name fileno(", fileno($ob), ")" if $dbg;
 127
 128         my $str = Mojo::IOLoop::Stream->new($ob);
 129         $str->on(error=>sub {say "serial $_[1]"; undef $s; Mojo::IOLoop->reset;});
 130
 131         $str->on(close=>sub {say "serial closing"; undef $s;  Mojo::IOLoop->reset;});
 132         $str->on(timeout=>sub {say "serial timeout";});
 133         $str->on(read=>sub {on_read(@_)});
 134         $str->start;
 135
 136         $rid = Mojo::IOLoop->recurring(2.5 => sub {start_loop() if !$state || $state eq "waitnl";});
 137
 138         return $str;
 139 }
 140
 141 sub process
 142 {
 143         my $blk = shift;
 144         my $loo =  substr $blk,0,3;
 145         unless ( $loo eq 'LOO') {
 146                 say "Block invalid loo -> $loo" if $dbg; return;
 147         }
 148
 149         my $t;
 150         my %h;
 151
 152
 153         #$h{'next_rec'}     = unpack("s", substr $blk,5,2);
 154
 155         $h{'Barometric_Trend'}    = unpack("C", substr $blk,3,1);
 156         $h{'Barometric_Trend_txt'} = $bar_trend{$h{'Barometric_Trend'}};
 157         $t = unpack("s", substr $blk,7,2) / 1000;
 158         $h{'Barometric_Press_mb'} = sprintf("%.0f",$t*33.8637526);
 159
 160
 161         $t = unpack("s", substr $blk,9,2) / 10;
 162         $h{'Air_Temp_Inside_c'} = sprintf("%.1f",($t - 32) * 5/9);
 163         my $tf  = unpack("s", substr $blk,12,2) / 10;
 164         $h{'Air_Temp_Outside_c'}  = sprintf("%.1f",($tf - 32) * 5/9);
 165
 166         $h{'Wind_Speed_mph'}   = unpack("C", substr $blk,14,1);
 167         $h{'Wind_Speed_mps'} = sprintf("%.1f",$h{'Wind_Speed_mph'}*0.44704);
 168         $h{'Wind_Speed_10min_Avg_mph'} = unpack("C", substr $blk,15,1);
 169         $h{'Wind_Speed_10min_Avg_mps'} = sprintf("%.1f",$h{'Wind_Speed_10min_Avg_mph'}*0.44704);
 170         $h{'Wind_Dir'}     = unpack("s", substr $blk,16,2);
 171
 172
 173         $h{'Humidity_Outside'} = unpack("C", substr $blk,33,1);
 174         $h{'Humidity_Inside'}  = unpack("C", substr $blk,11,1);
 175         $h{'Dew_Point'}  = dew_point($h{Air_Temp_Outside_c}, $h{'Humidity_Outside'});
 176
 177         $h{'UV'}         = unpack("C", substr $blk,43,1);
 178         $h{'Solar'}  = unpack("s", substr $blk,44,2);   # watt/m**2
 179
 180         $h{'Rain_Rate'}  = unpack("s", substr $blk,41,2) * $rain_mult;
 181         $h{'Rain_Day'}   = unpack("s", substr $blk,50,2) * $rain_mult;
 182         $h{'Rain_Month'}  = unpack("s", substr $blk,52,2) * $rain_mult;
 183         $h{'Rain_Year'}  = unpack("s", substr $blk,54,2) * $rain_mult;
 184
 185         $h{'ET_Day'}   = unpack("s", substr $blk,56,2)/1000;
 186         $h{'ET_Month'}  = unpack("s", substr $blk,58,2)/100;
 187         $h{'ET_Year'}  = unpack("s", substr $blk,60,2)/100;
 188
 189         #$h{'Alarms_Inside'}  = unpack("b8", substr $blk,70,1);
 190         #$h{'Alarms_Rain'}  = unpack("b8", substr $blk,70,1);
 191         #$h{'Alarms_Outside'}  = unpack("b8", substr $blk,70,1);
 192
 193         $h{'Batt_TX_OK'}  = (unpack("C", substr $blk,86,1)+0) ^ 1;
 194         $h{'Batt_Console'}  = unpack("s", substr $blk,87,2) * 0.005859375;
 195
 196         $h{'Forecast_Icon'}  = unpack("C", substr $blk,89,1);
 197         $h{'Forecast_Rule'}  = unpack("C", substr $blk,90,1);
 198
 199         $h{'Sunrise'}  = sprintf( "%04d", unpack("S", substr $blk,91,2) );
 200         $h{'Sunrise'}  =~ s/(\d{2})(\d{2})/$1:$2/;
 201         $h{'Sunset'}   = sprintf( "%04d", unpack("S", substr $blk,93,2) );
 202         $h{'Sunset'}  =~ s/(\d{2})(\d{2})/$1:$2/;
 203
 204         #my $nl  =  ord substr $blk,95,1;
 205         #my $cr  =  ord substr $blk,96,1;
 206
 207         my $crc = unpack "%n", substr($blk,97,2);
 208         my $crc_calc = CRC_CCITT($blk);
 209
 210         if ($crc_calc==0) {
 211                 my $o = gen_hash_diff($last_reading, \%h);
 212                 $last_reading = \%h;
 213                 if (time % 60 == 0) {
 214                         my $oo = {t => time, r =>\%h};
 215                         say encode_json($oo);
 216                 } elsif ($o) {
 217                         my $oo = {t => time, r =>$o};
 218                         say encode_json($oo);
 219                 }
 220         } else {
 221                 say "CRC check failed for LOOP data!";
 222                 return 1;
 223         }
 224         #delete @h{'crc', 'crc_calc', 'next_rec'};
 225         #delete($h{crc})||die"cant delete crc";
 226         #delete($h{crc_calc})||die"cant delete crc_calc";
 227         #delete($h{next_rec})||die"cant delete next_rec";
 228 }
 229
 230 sub gen_hash_diff
 231 {
 232         my $last = shift;
 233         my $now = shift;
 234         my %o;
 235         my $count;
 236
 237         while (my ($k, $v) = each %$now) {
 238                 if ($last->{$k} ne $now->{$k}) {
 239                         $o{$k} = $v;
 240                         ++$count;
 241                 }
 242         }
 243         return $count ? \%o : undef;
 244 }
 245
 246 sub dew_point
 247 {
 248         my $temp = shift @_;
 249         my $rh   = shift @_;
 250
 251         #  Using the simplified approximation for dew point
 252         #  Accurate to 1 degree C for humidities > 50 %
 253         #  http://en.wikipedia.org/wiki/Dew_point
 254
 255         my $dew_point = $temp - ( (100 - $rh)/5 );
 256
 257         return $dew_point;
 258 }
 259
 260 sub CRC_CCITT
 261 {
 262     # Expects packed data...
 263     my $data_str = shift @_;
 264
 265         my $crc = 0;
 266         my @lst = split //, $data_str;
 267         foreach my $data (@lst) {
 268                 my $data = unpack("c",$data);
 269
 270                 my $crc_prev = $crc;
 271                 my $index = $crc >> 8 ^ $data;
 272                 my $lhs = $crc_table[$index];
 273                 #print "lhs=$lhs, crc=$crc\n";
 274                 my $rhs = ($crc << 8) & 0xFFFF;
 275                 $crc = $lhs ^ $rhs;
 276
 277
 278         }
 279
 280         return $crc;
 281 }
 282