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git-svn-id: https://svn.fhem.de/fhem/trunk/fhem@16408 2b470e98-0d58-463d-a4d8-8e2adae1ed80
361 lines
11 KiB
Perl
361 lines
11 KiB
Perl
##############################################
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# I2C_K30.pm: heavily based on I2C_SHT21.pm
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#
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# $Id$
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package main;
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use strict;
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use warnings;
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use constant {
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# For details, see SenseAir "I2C communication guide for K20/K21/K22/K30 platforms"
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K30_I2C_ADDRESS => 0x68,
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K30_REQ_READ_RAM => 0x20,
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K30_RESP_READ_COMPLETE => 0x21,
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K30_ADDR_CO2 => 0x08,
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K30_LEN_CO2 => 2
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};
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##################################################
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# Forward declarations
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#
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sub I2C_K30_Initialize($);
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sub I2C_K30_Define($$);
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sub I2C_K30_Attr(@);
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sub I2C_K30_Poll($);
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sub I2C_K30_Set($@);
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sub I2C_K30_Undef($$);
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sub I2C_K30_DbLog_splitFn($);
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my %sets = (
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'readValues' => 1,
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);
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sub I2C_K30_Initialize($) {
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my ($hash) = @_;
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$hash->{DefFn} = 'I2C_K30_Define';
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$hash->{InitFn} = 'I2C_K30_Init';
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$hash->{AttrFn} = 'I2C_K30_Attr';
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$hash->{SetFn} = 'I2C_K30_Set';
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$hash->{UndefFn} = 'I2C_K30_Undef';
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$hash->{I2CRecFn} = 'I2C_K30_I2CRec';
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$hash->{AttrList} = 'IODev do_not_notify:0,1 showtime:0,1 poll_interval:1,2,5,10,20,30 ' .
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$readingFnAttributes;
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$hash->{DbLog_splitFn} = "I2C_K30_DbLog_splitFn";
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}
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sub I2C_K30_Define($$) {
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my ($hash, $def) = @_;
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my @a = split('[ \t][ \t]*', $def);
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$hash->{STATE} = "defined";
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if ($main::init_done) {
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eval { I2C_K30_Init( $hash, [ @a[ 2 .. scalar(@a) - 1 ] ] ); };
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return I2C_K30_Catch($@) if $@;
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}
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return undef;
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}
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sub I2C_K30_Init($$) {
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my ( $hash, $args ) = @_;
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my $name = $hash->{NAME};
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if (defined $args && int(@$args) > 1)
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{
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Log3 $hash, 1, "Define: Wrong syntax. Can't initialize sensor.";
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return;
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}
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if (defined (my $address = shift @$args)) {
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$hash->{I2C_Address} = $address =~ /^0.*$/ ? oct($address) : $address;
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return "$name I2C Address not valid" unless ($address < 128 && $address > 3);
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} else {
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$hash->{I2C_Address} = K30_I2C_ADDRESS;
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}
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my $msg = '';
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# create default attributes
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if (AttrVal($name, 'poll_interval', '?') eq '?') {
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$msg = CommandAttr(undef, $name . ' poll_interval 5');
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if ($msg) {
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Log3 ($hash, 1, $msg);
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return $msg;
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}
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}
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AssignIoPort($hash);
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$hash->{STATE} = 'Initialized';
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return undef;
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}
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sub I2C_K30_Catch($) {
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my $exception = shift;
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if ($exception) {
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$exception =~ /^(.*)( at.*FHEM.*)$/;
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return $1;
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}
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return undef;
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}
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sub I2C_K30_Attr (@) {# hier noch Werteueberpruefung einfuegen
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my ($command, $name, $attr, $val) = @_;
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my $hash = $defs{$name};
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my $msg = '';
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if ($command && $command eq "set" && $attr && $attr eq "IODev") {
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eval {
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if ($main::init_done and (!defined ($hash->{IODev}) or $hash->{IODev}->{NAME} ne $val)) {
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main::AssignIoPort($hash,$val);
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my @def = split (' ',$hash->{DEF});
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I2C_K30_Init($hash,\@def) if (defined ($hash->{IODev}));
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}
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};
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return I2C_K30_Catch($@) if $@;
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}
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if ($attr eq 'poll_interval') {
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if ($val > 0) {
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RemoveInternalTimer($hash);
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InternalTimer(gettimeofday() + 5, 'I2C_K30_Poll', $hash, 0);
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} else {
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$msg = 'Wrong poll intervall defined. poll_interval must be a number > 0';
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}
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}
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return ($msg) ? $msg : undef;
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}
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sub I2C_K30_Poll($) {
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my ($hash) = @_;
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my $name = $hash->{NAME};
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# Read values
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I2C_K30_Set($hash, ($name, 'readValues'));
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my $pollInterval = AttrVal($hash->{NAME}, 'poll_interval', 0);
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if ($pollInterval > 0) {
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InternalTimer(gettimeofday() + ($pollInterval * 60), 'I2C_K30_Poll', $hash, 0);
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}
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}
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sub I2C_K30_Set($@) {
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my ($hash, @a) = @_;
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my $name = $a[0];
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my $cmd = $a[1];
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if(!defined($sets{$cmd})) {
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return 'Unknown argument ' . $cmd . ', choose one of ' . join(' ', keys %sets)
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}
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if ($cmd eq 'readValues') {
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I2C_K30_readCO2($hash);
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}
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}
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sub I2C_K30_Undef($$) {
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my ($hash, $arg) = @_;
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RemoveInternalTimer($hash);
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return undef;
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}
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sub I2C_K30_I2CRec ($$) {
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my ($hash, $clientmsg) = @_;
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my $name = $hash->{NAME};
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my $phash = $hash->{IODev};
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my $pname = $phash->{NAME};
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while ( my ( $k, $v ) = each %$clientmsg ) {
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#erzeugen von Internals fuer alle Keys in $clientmsg die mit dem physical Namen beginnen
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$hash->{$k} = $v if $k =~ /^$pname/ ;
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}
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# Read Complete Response
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if ( $clientmsg->{direction} && $clientmsg->{$pname . "_SENDSTAT"} && $clientmsg->{$pname . "_SENDSTAT"} eq "Ok" ) {
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if ( $clientmsg->{direction} eq "i2cread" && defined($clientmsg->{received}) ) {
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Log3 $hash, 4, "empfangen: $clientmsg->{received}";
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my @raw = split(" ",$clientmsg->{received});
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I2C_K30_ParseCO2 ($hash, $clientmsg->{received}) if ($raw[0] == K30_RESP_READ_COMPLETE) && $clientmsg->{nbyte} == 4;
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}
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}
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}
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sub I2C_K30_ParseCO2 ($$) {
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my ($hash, $rawdata) = @_;
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my @raw = split(" ",$rawdata);
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if ( defined (my $crc = I2C_K30_CheckCrc(@raw)) ) { #CRC Test
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Log3 $hash, 3, "CRC error CO2 data: $rawdata, Checksum calculated: $crc";
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$hash->{CRCError}++;
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return;
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}
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my $co2 = $raw[1] << 8 | $raw[2];
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$co2 = sprintf('%i', $co2);
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readingsBeginUpdate($hash);
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readingsBulkUpdate(
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$hash,
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'state',
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'CO2: ' . $co2
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);
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readingsBulkUpdate($hash, 'CO2', $co2);
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readingsEndUpdate($hash, 1);
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}
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sub I2C_K30_readCO2($) {
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my ($hash) = @_;
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my $name = $hash->{NAME};
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return "$name: no IO device defined" unless ($hash->{IODev});
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my $phash = $hash->{IODev};
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my $pname = $phash->{NAME};
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my $i2creq = { i2caddress => $hash->{I2C_Address}, direction => "i2cwrite" };
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# read CO2 from sensor RAM, last byte: "checksum" of all preceding bytes
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$i2creq->{data} = join(" ", (K30_REQ_READ_RAM | K30_LEN_CO2, 0, K30_ADDR_CO2, (K30_REQ_READ_RAM + K30_LEN_CO2 + 0 + K30_ADDR_CO2) ) );
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CallFn($pname, "I2CWrtFn", $phash, $i2creq);
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RemoveInternalTimer($hash);
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InternalTimer(gettimeofday() + 1, 'I2C_K30_readValue', $hash, 0); #nach 1s Wert lesen (min. 20ms lt. Datenblatt)
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return;
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}
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sub I2C_K30_readValue($) {
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my ($hash) = @_;
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my $name = $hash->{NAME};
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return "$name: no IO device defined" unless ($hash->{IODev});
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my $phash = $hash->{IODev};
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my $pname = $phash->{NAME};
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# Reset Internal Timer to Poll Sub
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RemoveInternalTimer($hash);
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my $pollInterval = AttrVal($hash->{NAME}, 'poll_interval', 0);
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InternalTimer(gettimeofday() + ($pollInterval * 60), 'I2C_K30_Poll', $hash, 0) if ($pollInterval > 0);
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# Read the three byte result from device + 1byte CRC
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my $i2cread = { i2caddress => $hash->{I2C_Address}, direction => "i2cread" };
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$i2cread->{nbyte} = 4;
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CallFn($pname, "I2CWrtFn", $phash, $i2cread);
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return;
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}
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sub I2C_K30_CheckCrc(@) {
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my @data = @_;
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my $crc = 0;
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for (my $n = 0; $n < (scalar(@data) - 1); ++$n) {
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$crc += $data[$n];
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}
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return ($crc = $data[3] ? undef : $crc);
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}
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sub I2C_K30_DbLog_splitFn($) {
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my ($event) = @_;
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Log3 undef, 3, "in DbLog_splitFn empfangen: $event";
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my ($reading, $value, $unit) = "";
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my @parts = split(/ /,$event);
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$reading = shift @parts;
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$reading =~ tr/://d;
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$value = $parts[0];
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$unit = "ppm" if(lc($reading) =~ m/CO2/);
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return ($reading, $value, $unit);
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}
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1;
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=pod
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=item device
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=item summary read SenseAir K30 CO2 sensor via I2C bus
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=item summary_DE SenseAir K30 CO2 Sensor über I2C auslesen
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=begin html
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<a name="I2C_K30"></a>
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<h3>I2C_K30</h3>
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(en | <a href="commandref_DE.html#I2C_K30">de</a>)
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<ul>
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<a name="I2C_K30"></a>
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Provides an interface to the K30 CO2 sensor from <a href="www.senseair.com">SenseAir</a>. This module
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expects the sensor to be connected via I2C (for a quick summary, see
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<a href="http://co2meters.com/Documentation/AppNotes/AN142-RaspberryPi-K_series.pdf">Application Note 142 "K-30/K-33 I2C on Raspberry Pi"</a>
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from co2meters.com).<br>
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On my Raspberry Pi 2, I needed to reduce I2C frequency to 90 kHz, otherwise most read/write cycles failed (add
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"options i2c_bcm2708 baudrate=90000", e.g. to /etc/modprobe.d/i2c-options.conf). I still see sporadic errors (about 5% of all readings
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fail), but this seems to be expected - the datasheet warns that the uC on the sensor will only correctly handle I2C when it's not busy
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doing CO2 measurement.
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The I2C messages are sent through an I2C interface module like <a href="#RPII2C">RPII2C</a>, <a href="#FRM">FRM</a>
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or <a href="#NetzerI2C">NetzerI2C</a> so this device must be defined first.<br>
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<b>attribute IODev must be set</b><br>
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<a name="I2C_K30Define"></a><br>
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<b>Define</b>
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<ul>
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<code>define <name> I2C_K30 [<I2C Address>]</code><br>
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where <code><I2C Address></code> is the configured I2C address of the sensor (default: 104, i.e. 0x68) <br>
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</ul>
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<a name="I2C_K30Set"></a>
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<b>Set</b>
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<ul>
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<code>set <name> readValues</code><br>
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Reads the current CO2 value from sensor.<br><br>
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</ul>
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<a name="I2C_K30Attr"></a>
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<b>Attributes</b>
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<ul>
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<li>poll_interval<br>
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Set the polling interval in minutes to query data from sensor<br>
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Default: 5, valid values: 1,2,5,10,20,30<br><br>
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</li>
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<li><a href="#IODev">IODev</a></li>
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<li><a href="#do_not_notify">do_not_notify</a></li>
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<li><a href="#showtime">showtime</a></li>
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</ul><br>
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</ul>
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=end html
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=begin html_DE
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<a name="I2C_K30"></a>
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<h3>I2C_K30</h3>
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(<a href="commandref.html#I2C_K30">en</a> | de)
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<ul>
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<a name="I2C_K30"></a>
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Ermöglicht die Verwendung eines K30 CO2 Sensors von <a href="www.senseair.com">SenseAir</a>. Der Sensor
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muss über I2C angeschlossen sein (siehe z.B.
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<a href="http://co2meters.com/Documentation/AppNotes/AN142-RaspberryPi-K_series.pdf">Application Note 142 "K-30/K-33 I2C on Raspberry Pi"</a>
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von co2meters.com).
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Auf meinem Raspberry Pi 2 musste ich die I2C-Frequenz auf 90 kHz reduzieren, sonst sind die meisten I2C-Zugriffe fehlgeschlagen
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("options i2c_bcm2708 baudrate=90000", z.B. in /etc/modprobe.d/i2c-options.conf eintragen). Nach wie vor gehen ca. 5 % der Zugriffe schief,
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aber das scheint normal zu sein - zumindest warnt das Datenblatt, dass I2C-Zugriffe fehlschlagen können, wenn der Microcontroller auf dem
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Sensor gerade mit einer CO2-Messung beschäftigt ist.
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I2C-Botschaften werden über ein I2C Interface Modul wie beispielsweise das <a href="#RPII2C">RPII2C</a>, <a href="#FRM">FRM</a>
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oder <a href="#NetzerI2C">NetzerI2C</a> gesendet. Daher muss dieses vorher definiert werden.<br>
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<b>Das Attribut IODev muss definiert sein.</b><br>
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<a name="I2C_K30Define"></a><br>
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<b>Define</b>
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<ul>
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<code>define <name> I2C_K30 [<I2C Address>]</code><br>
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Der Wert <code><I2C Address></code> ist die konfigurierte I2C-Adresse des Sensors (Standard: 104 bzw. 0x68)<br>
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</ul>
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<a name="I2C_K30Set"></a>
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<b>Set</b>
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<ul>
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<code>set <name> readValues</code><br>
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Aktuellen CO2 Wert vom Sensor lesen.<br><br>
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</ul>
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<a name="I2C_K30Attr"></a>
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<b>Attribute</b>
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<ul>
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<li>poll_interval<br>
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Aktualisierungsintervall aller Werte in Minuten.<br>
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Standard: 5, gültige Werte: 1,2,5,10,20,30<br><br>
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</li>
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<li><a href="#IODev">IODev</a></li>
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<li><a href="#do_not_notify">do_not_notify</a></li>
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<li><a href="#showtime">showtime</a></li>
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</ul><br>
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</ul>
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=end html_DE
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=cut
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