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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2022 -- leonerd@leonerd.org.uk |
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86564
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use v5.26; |
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use warnings; |
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use Object::Pad 0.51; |
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14160
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package Electronics::PSU::DPSxxxx 0.02; |
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class Electronics::PSU::DPSxxxx; |
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600
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use Carp; |
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82
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411
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use Future::AsyncAwait; |
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420
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use Future::IO; |
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9912
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use Fcntl qw( O_NOCTTY O_NDELAY ); |
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972
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use IO::Termios; |
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41391
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20
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# Protocol::Modbus exists but it doesn't do async, and it doesn't do proper |
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# frame detection of incoming data :( |
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# We'll just write this all ourselves; it's not hard |
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# See also |
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# https://autoit.de/wcf/attachment/88980-dps3005-cnc-communication-protocol-v1-2-pdf/ |
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=head1 NAME |
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C - control a F power supply |
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32
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=head1 SYNOPSIS |
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34
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use Future::AsyncAwait; |
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36
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use Electronics::PSU::DPSxxxx; |
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38
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my $psu = Electronics::PSU::DPSxxxx->new( dev => "/dev/ttyUSB0" ); |
39
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40
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await $psu->set_voltage( 1.23 ); # volts |
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await $psu->set_current( 0.200 ); # amps |
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43
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await $psu->set_output_state( 1 ); # turn it on! |
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45
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=head1 DESCRIPTION |
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47
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This module allows control of a F F-series power supply, such as |
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the F, when connected over a serial port. |
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50
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=head2 Interface Design |
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52
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The interface is currently an ad-hoc collection of whatever seems to work |
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here, but my hope is to find a more generic shareable interface that multiple |
54
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differenet modules can use, to provide interfaces to various kinds of |
55
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electronics test equipment. |
56
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57
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The intention is that it should eventually be possible to write a script for |
58
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performing automated electronics testing or experimentation, and easily swap |
59
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out modules to suit the equipment available. Similar concepts apply in fields |
60
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like L, or L, so there should be plenty of ideas to borrow. |
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62
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=cut |
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64
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has $_fh :param = undef; |
65
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has $_addr :param = 1; |
66
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67
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ADJUSTPARAMS ( $params ) |
68
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{ |
69
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unless( $_fh ) { |
70
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my $dev = delete $params->{dev}; |
71
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72
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$_fh = IO::Termios->open( $dev, "9600,8,n,1", O_NOCTTY, O_NDELAY ) or |
73
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croak "Cannot open $dev - $!"; |
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75
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$_fh->cfmakeraw; |
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$_fh->setflag_clocal( 1 ); |
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$_fh->blocking( 1 ); |
78
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$_fh->autoflush; |
79
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} |
80
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} |
81
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82
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sub _calc_crc ( $data ) |
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20
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20
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{ |
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20
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20
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84
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# This is not the standard CRC16 algorithm |
85
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# Stolen and adapted from |
86
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# https://ctlsys.com/support/how_to_compute_the_modbus_rtu_message_crc/ |
87
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20
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22
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my $crc = 0xFFFF; |
88
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20
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59
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foreach my $d ( split //, $data ) { |
89
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115
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122
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$crc ^= ord $d; |
90
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115
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130
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foreach ( 1 .. 8 ) { |
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920
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100
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1002
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if( $crc & 0x0001 ) { |
92
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427
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395
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$crc >>= 1; |
93
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427
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421
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$crc ^= 0xA001; |
94
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} |
95
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else { |
96
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493
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498
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$crc >>= 1; |
97
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} |
98
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} |
99
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} |
100
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101
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20
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57
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return $crc; |
102
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} |
103
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104
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10
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11
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async method _send_command ( $func, $format, @args ) |
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11
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10
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14
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10
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12
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10
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105
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10
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14
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{ |
106
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10
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47
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my $request = pack "C C $format", $_addr, $func, @args; |
107
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108
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# CRC is appended in little-endian format |
109
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10
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18
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$request .= pack "S<", _calc_crc( $request ); |
110
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111
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10
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37
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await Future::IO->syswrite( $_fh, $request ); |
112
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10
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10
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11
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} |
113
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114
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10
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14
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async method _recv_response ( $func, $len, $format ) |
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12
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10
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11
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10
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11
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10
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10
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115
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10
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25
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{ |
116
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10
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33
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my $response = await Future::IO->sysread_exactly( $_fh, 2 + $len + 2 ); |
117
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118
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10
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10955
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my $got_crc = unpack "S<", substr( $response, -2, 2, "" ); |
119
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10
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50
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23
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if( $got_crc != ( my $want_crc = _calc_crc( $response ) ) ) { |
120
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# Just warn for now |
121
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0
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0
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warn sprintf "Received PDU CRC %04X, expected %04X\n", $got_crc, $want_crc; |
122
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} |
123
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124
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10
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37
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my ( $got_addr, $got_func, $payload ) = unpack "C C a*", $response; |
125
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10
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50
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19
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$got_addr == $_addr or croak "Received response from unexpected addr"; |
126
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10
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50
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21
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$got_func == $func or croak "Received response for unexpected function"; |
127
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128
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10
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46
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return unpack $format, $payload; |
129
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10
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10
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18
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} |
130
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131
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use constant { |
132
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2
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663
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FUNC_READ_HOLDING_REGISTER => 0x03, |
133
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FUNC_WRITE_SINGLE_REGISTER => 0x06, |
134
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2
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2
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1692
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}; |
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3
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135
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136
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7
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11
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async method _read_holding_registers ( $reg, $count = 1 ) |
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10
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7
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8
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7
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10
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137
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7
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11
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{ |
138
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7
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17
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await $self->_send_command( FUNC_READ_HOLDING_REGISTER, "S> S>", $reg, $count ); |
139
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140
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7
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12277
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my ( $nbytes, @regs ) = |
141
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await $self->_recv_response( FUNC_READ_HOLDING_REGISTER, 1 + 2*$count, "C (S>)*" ); |
142
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143
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7
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373
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return @regs; |
144
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7
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7
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10
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} |
145
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146
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3
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4
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async method _write_single_register ( $reg, $value ) |
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3
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4
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3
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3
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3
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4
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147
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3
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5
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{ |
148
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3
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8
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await $self->_send_command( FUNC_WRITE_SINGLE_REGISTER, "S> S>", $reg, $value ); |
149
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150
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# ignore result |
151
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3
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2954
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await $self->_recv_response( FUNC_WRITE_SINGLE_REGISTER, 2 + 2, "S> S>" ); |
152
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153
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3
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142
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return; |
154
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3
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3
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4
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} |
155
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156
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=head1 METHODS |
157
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158
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=cut |
159
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160
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use constant { |
161
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2
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612
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REG_USET => 0x00, # centivolts |
162
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REG_ISET => 0x01, # miliamps |
163
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REG_UOUT => 0x02, # centivolts (RO) |
164
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REG_IOUT => 0x03, # miliiamps (RO) |
165
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REG_POWER => 0x04, # (RO) |
166
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REG_UIN => 0x05, # centivolts (RO) |
167
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REG_LOCK => 0x06, # 0=off 1=on |
168
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REG_PROTECT => 0x07, # 0=ok, 1=OVP 2=OCP 3=OPP |
169
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REG_CVCC => 0x08, # 0=CV 1=CC |
170
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REG_ONOFF => 0x09, # 0=off 1=on |
171
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REG_B_LED => 0x0A, |
172
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REG_MODEL => 0x0B, # (RO) |
173
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REG_VERSION => 0x0C, # (RO) |
174
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2
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2
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11
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}; |
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2
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5
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175
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176
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=head2 set_voltage |
177
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178
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await $psu->set_voltage( $volts ); |
179
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180
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Sets the output voltage, in volts. |
181
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182
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=cut |
183
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184
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1
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2
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async method set_voltage ( $voltage ) |
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1
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2
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1
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1
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185
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1
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3
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{ |
186
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1
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6
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await $self->_write_single_register( REG_USET, $voltage * 100 ); |
187
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1
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1
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1
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2572
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} |
188
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189
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=head2 set_current |
190
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191
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await $psu->set_current( $amps ); |
192
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193
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Sets the output current, in amps. |
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195
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=cut |
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197
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1
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2
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async method set_current ( $current ) |
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1
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{ |
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await $self->_write_single_register( REG_ISET, $current * 1000 ); |
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1
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1
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1
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95
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} |
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202
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my %READINGS; |
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204
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# Build up all the reading methods |
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BEGIN { |
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2
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2
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13
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use Object::Pad qw( :experimental(mop) ); |
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207
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208
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2
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2
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882
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my $metaclass = Object::Pad::MOP::Class->for_caller; |
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210
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%READINGS = ( # register, scale |
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2
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9
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output_voltage => [ REG_UOUT, sub { $_ / 100 } ], |
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2
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output_current => [ REG_IOUT, sub { $_ / 1000 } ], |
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1
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input_voltage => [ REG_UIN, sub { $_ / 100 } ], |
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0
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0
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output_protect => [ REG_PROTECT, sub { (qw( ok OVP OCP OPP ))[$_]} ], |
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78
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output_mode => [ REG_CVCC, sub { (qw( CV CC ))[$_] } ], |
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); |
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218
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2
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7
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foreach my $name ( keys %READINGS ) { |
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$metaclass->add_method( |
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1301
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"read_$name" => async method { return await $self->read_multiple( $name ) } |
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8650
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); |
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} |
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} |
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225
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=head2 read_output_voltage |
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227
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$volts = await $psu->read_output_voltage; |
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229
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Returns the measured voltage at the output terminals, in volts. |
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231
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=head2 read_output_current |
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233
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$amps = await $psu->read_output_current; |
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235
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Returns the measured current at the output terminals, in amps. |
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237
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=head2 read_input_voltage |
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239
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$volts = await $psu->read_input_voltage; |
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241
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Returns the input voltage to the PSU module, in volts. |
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243
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=head2 read_output_protect |
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245
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$protect = await $psu->read_output_protect; |
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247
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Returns the output protection state as a string, either C<"ok"> if protection |
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has not been triggered, or one of C<"OVP">, C<"OCP"> or C<"OPP"> if any of the |
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protection mechanisms have been triggered. |
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251
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=head2 read_output_mode |
252
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253
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$mode = await $psu->read_output_mode; |
254
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255
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Returns the output mode, as a string either C<"CV"> for constant-voltage or |
256
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C<"CC"> for constant-current. |
257
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258
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=cut |
259
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260
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=head2 read_multiple |
261
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262
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@readings = await $psu->read_multiple( @names ) |
263
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264
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Returns multiple measurements in a single query. This is faster than |
265
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performing several individual read requests. C<@names> should be a list of |
266
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string names, taken from the C method names. For example: |
267
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268
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my ( $volts, $amps ) = |
269
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await $psu->read_multiple(qw( output_voltage output_current )); |
270
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271
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Results are returned in the same order as the requested names. |
272
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273
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=cut |
274
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275
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5
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7
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async method read_multiple ( @names ) |
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5
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10
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5
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5
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276
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5
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11
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{ |
277
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5
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8
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my ( $minreg, $maxreg ); |
278
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279
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my @regs = map { |
280
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5
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50
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9
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my $m = $READINGS{$_} or croak "Measurement '$_' is not recognised"; |
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6
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20
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281
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6
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12
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my $reg = $m->[0]; |
282
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6
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100
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66
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20
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$minreg = $reg if !defined $minreg or $reg < $minreg; |
283
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6
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50
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66
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32
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$maxreg = $reg if !defined $maxreg or $reg > $maxreg; |
284
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} @names; |
285
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286
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5
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15
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my @values = await $self->_read_holding_registers( $minreg, $maxreg-$minreg+1 ); |
287
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288
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return map { |
289
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5
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226
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my $m = $READINGS{$_}; |
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6
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11
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290
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6
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23
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$m->[1]->( local $_ = $values[$m->[0] - $minreg] ); |
291
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} @names; |
292
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5
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5
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1
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2781
|
} |
293
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294
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=head2 set_output_state |
295
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296
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await $psu->set_output_state( $on ); |
297
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298
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Switches output on / off. |
299
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300
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=cut |
301
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302
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1
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2
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async method set_output_state ( $on ) |
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1
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3
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1
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1
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303
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1
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4
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{ |
304
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1
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4
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await $self->_write_single_register( REG_ONOFF, !!$on ); |
305
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1
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1
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1
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2838
|
} |
306
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307
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=head2 read_model |
308
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309
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$model = await $psu->read_model; |
310
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311
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Returns the model number (e.g. 3005 for F). |
312
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313
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=cut |
314
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315
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async method read_model |
316
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1
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4
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{ |
317
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1
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5
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return await $self->_read_holding_registers( REG_MODEL ); |
318
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1
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1
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1
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1463
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} |
319
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320
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=head2 read_version |
321
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322
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$version = await $psu->read_version; |
323
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324
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Returns firmware version as an integer. |
325
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326
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=cut |
327
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328
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async method read_version |
329
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1
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3
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{ |
330
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1
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4
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return await $self->_read_holding_registers( REG_VERSION ); |
331
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1
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1
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1
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3539
|
} |
332
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333
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=head1 AUTHOR |
334
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335
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Paul Evans |
336
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337
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=cut |
338
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339
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0x55AA; |