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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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103132
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use v5.26; |
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use warnings; |
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1008
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use Object::Pad 0.70 ':experimental(adjust_params)'; |
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16416
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package Electronics::PSU::DPSxxxx 0.03; |
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class Electronics::PSU::DPSxxxx; |
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use Carp; |
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92
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449
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use Future::AsyncAwait; |
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13685
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465
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use Future::IO; |
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10342
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use Fcntl qw( O_NOCTTY O_NDELAY ); |
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925
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use IO::Termios; |
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45941
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21
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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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30
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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 |
41
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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 |
48
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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 |
53
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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. |
61
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62
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=cut |
63
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64
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has $_fh :param = undef; |
65
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has $_addr :param = 1; |
66
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67
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ADJUST :params ( |
68
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:$dev = undef, |
69
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) { |
70
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unless( $_fh ) { |
71
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$_fh = IO::Termios->open( $dev, "9600,8,n,1", O_NOCTTY, O_NDELAY ) or |
72
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croak "Cannot open $dev - $!"; |
73
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74
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$_fh->cfmakeraw; |
75
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$_fh->setflag_clocal( 1 ); |
76
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$_fh->blocking( 1 ); |
77
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$_fh->autoflush; |
78
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} |
79
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} |
80
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81
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sub _calc_crc ( $data ) |
82
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20
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20
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32
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{ |
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29
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20
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27
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83
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# This is not the standard CRC16 algorithm |
84
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# Stolen and adapted from |
85
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# https://ctlsys.com/support/how_to_compute_the_modbus_rtu_message_crc/ |
86
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20
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25
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my $crc = 0xFFFF; |
87
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20
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63
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foreach my $d ( split //, $data ) { |
88
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115
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129
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$crc ^= ord $d; |
89
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115
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144
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foreach ( 1 .. 8 ) { |
90
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920
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100
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1145
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if( $crc & 0x0001 ) { |
91
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427
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437
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$crc >>= 1; |
92
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427
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487
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$crc ^= 0xA001; |
93
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} |
94
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else { |
95
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493
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573
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$crc >>= 1; |
96
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} |
97
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} |
98
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} |
99
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100
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20
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61
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return $crc; |
101
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} |
102
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103
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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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10
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14
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10
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16
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10
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15
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10
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13
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104
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10
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19
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{ |
105
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10
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57
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my $request = pack "C C $format", $_addr, $func, @args; |
106
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107
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# CRC is appended in little-endian format |
108
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10
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20
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$request .= pack "S<", _calc_crc( $request ); |
109
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110
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10
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34
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await Future::IO->syswrite( $_fh, $request ); |
111
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10
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10
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13
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} |
112
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113
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10
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12
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async method _recv_response ( $func, $len, $format ) |
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10
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15
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10
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13
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10
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13
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10
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11
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114
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10
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28
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{ |
115
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10
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36
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my $response = await Future::IO->sysread_exactly( $_fh, 2 + $len + 2 ); |
116
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117
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10
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12723
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my $got_crc = unpack "S<", substr( $response, -2, 2, "" ); |
118
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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 ) ) ) { |
119
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# Just warn for now |
120
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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; |
121
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} |
122
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123
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10
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37
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my ( $got_addr, $got_func, $payload ) = unpack "C C a*", $response; |
124
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10
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50
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27
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$got_addr == $_addr or croak "Received response from unexpected addr"; |
125
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10
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50
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18
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$got_func == $func or croak "Received response for unexpected function"; |
126
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127
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10
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54
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return unpack $format, $payload; |
128
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10
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10
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17
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} |
129
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130
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use constant { |
131
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2
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817
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FUNC_READ_HOLDING_REGISTER => 0x03, |
132
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FUNC_WRITE_SINGLE_REGISTER => 0x06, |
133
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2
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2
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1996
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}; |
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2
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4
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134
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135
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7
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10
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async method _read_holding_registers ( $reg, $count = 1 ) |
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7
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12
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7
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10
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7
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9
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136
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7
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11
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{ |
137
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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 ); |
138
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139
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7
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14373
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my ( $nbytes, @regs ) = |
140
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await $self->_recv_response( FUNC_READ_HOLDING_REGISTER, 1 + 2*$count, "C (S>)*" ); |
141
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142
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7
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479
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return @regs; |
143
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7
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7
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14
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} |
144
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145
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3
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3
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async method _write_single_register ( $reg, $value ) |
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3
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5
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3
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5
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3
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4
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146
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3
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6
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{ |
147
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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 ); |
148
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149
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# ignore result |
150
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3
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3613
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await $self->_recv_response( FUNC_WRITE_SINGLE_REGISTER, 2 + 2, "S> S>" ); |
151
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152
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3
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192
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return; |
153
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3
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3
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5
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} |
154
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155
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=head1 METHODS |
156
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157
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=cut |
158
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159
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use constant { |
160
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2
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696
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REG_USET => 0x00, # centivolts |
161
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REG_ISET => 0x01, # miliamps |
162
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REG_UOUT => 0x02, # centivolts (RO) |
163
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REG_IOUT => 0x03, # miliiamps (RO) |
164
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REG_POWER => 0x04, # (RO) |
165
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REG_UIN => 0x05, # centivolts (RO) |
166
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REG_LOCK => 0x06, # 0=off 1=on |
167
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REG_PROTECT => 0x07, # 0=ok, 1=OVP 2=OCP 3=OPP |
168
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REG_CVCC => 0x08, # 0=CV 1=CC |
169
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REG_ONOFF => 0x09, # 0=off 1=on |
170
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REG_B_LED => 0x0A, |
171
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REG_MODEL => 0x0B, # (RO) |
172
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REG_VERSION => 0x0C, # (RO) |
173
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2
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2
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14
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}; |
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2
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4
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174
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175
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=head2 set_voltage |
176
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177
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await $psu->set_voltage( $volts ); |
178
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179
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Sets the output voltage, in volts. |
180
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181
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=cut |
182
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183
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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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184
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1
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5
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{ |
185
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1
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6
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await $self->_write_single_register( REG_USET, $voltage * 100 ); |
186
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1
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1
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1
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3056
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} |
187
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188
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=head2 set_current |
189
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190
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await $psu->set_current( $amps ); |
191
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192
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Sets the output current, in amps. |
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=cut |
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196
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1
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2
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async method set_current ( $current ) |
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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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119
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} |
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201
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my %READINGS; |
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203
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# Build up all the reading methods |
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BEGIN { |
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2
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12
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use Object::Pad qw( :experimental(mop) ); |
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206
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207
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2
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1059
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my $metaclass = Object::Pad::MOP::Class->for_caller; |
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%READINGS = ( # register, scale |
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output_voltage => [ REG_UOUT, sub { $_ / 100 } ], |
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output_current => [ REG_IOUT, sub { $_ / 1000 } ], |
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1
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8
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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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output_mode => [ REG_CVCC, sub { (qw( CV CC ))[$_] } ], |
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7
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); |
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217
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2
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foreach my $name ( keys %READINGS ) { |
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$metaclass->add_method( |
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1379
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"read_$name" => async method { return await $self->read_multiple( $name ) } |
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9685
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); |
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} |
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} |
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224
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=head2 read_output_voltage |
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226
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$volts = await $psu->read_output_voltage; |
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228
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Returns the measured voltage at the output terminals, in volts. |
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230
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=head2 read_output_current |
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232
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$amps = await $psu->read_output_current; |
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234
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Returns the measured current at the output terminals, in amps. |
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236
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=head2 read_input_voltage |
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238
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$volts = await $psu->read_input_voltage; |
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240
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Returns the input voltage to the PSU module, in volts. |
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242
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=head2 read_output_protect |
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244
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$protect = await $psu->read_output_protect; |
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246
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Returns the output protection state as a string, either C<"ok"> if protection |
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has not been triggered, or one of C<"OVP">, C<"OCP"> or C<"OPP"> if any of the |
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protection mechanisms have been triggered. |
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250
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=head2 read_output_mode |
251
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252
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$mode = await $psu->read_output_mode; |
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254
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Returns the output mode, as a string either C<"CV"> for constant-voltage or |
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C<"CC"> for constant-current. |
256
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257
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=cut |
258
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259
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=head2 read_multiple |
260
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261
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@readings = await $psu->read_multiple( @names ) |
262
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263
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Returns multiple measurements in a single query. This is faster than |
264
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performing several individual read requests. C<@names> should be a list of |
265
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string names, taken from the C method names. For example: |
266
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267
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my ( $volts, $amps ) = |
268
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await $psu->read_multiple(qw( output_voltage output_current )); |
269
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270
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Results are returned in the same order as the requested names. |
271
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272
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=cut |
273
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274
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5
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9
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async method read_multiple ( @names ) |
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5
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11
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5
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8
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275
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5
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10
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{ |
276
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5
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7
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my ( $minreg, $maxreg ); |
277
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278
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my @regs = map { |
279
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5
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50
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11
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my $m = $READINGS{$_} or croak "Measurement '$_' is not recognised"; |
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6
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19
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280
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6
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9
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my $reg = $m->[0]; |
281
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6
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100
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66
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21
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$minreg = $reg if !defined $minreg or $reg < $minreg; |
282
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6
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50
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66
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36
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$maxreg = $reg if !defined $maxreg or $reg > $maxreg; |
283
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} @names; |
284
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285
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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 ); |
286
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287
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return map { |
288
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5
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301
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my $m = $READINGS{$_}; |
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6
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10
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289
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6
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19
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$m->[1]->( local $_ = $values[$m->[0] - $minreg] ); |
290
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} @names; |
291
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5
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5
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1
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2911
|
} |
292
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293
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=head2 set_output_state |
294
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295
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await $psu->set_output_state( $on ); |
296
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297
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Switches output on / off. |
298
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299
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=cut |
300
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301
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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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2
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1
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3
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302
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1
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4
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{ |
303
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1
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3
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await $self->_write_single_register( REG_ONOFF, !!$on ); |
304
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1
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1
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1
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3264
|
} |
305
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306
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=head2 read_model |
307
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308
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$model = await $psu->read_model; |
309
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310
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Returns the model number (e.g. 3005 for F). |
311
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312
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=cut |
313
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314
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async method read_model |
315
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1
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4
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{ |
316
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1
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4
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return await $self->_read_holding_registers( REG_MODEL ); |
317
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1
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1
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1
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1636
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} |
318
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319
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=head2 read_version |
320
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321
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$version = await $psu->read_version; |
322
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323
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Returns firmware version as an integer. |
324
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325
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=cut |
326
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327
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async method read_version |
328
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1
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17
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{ |
329
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1
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5
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return await $self->_read_holding_registers( REG_VERSION ); |
330
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1
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1
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1
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3702
|
} |
331
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332
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=head1 AUTHOR |
333
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334
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Paul Evans |
335
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336
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=cut |
337
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338
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0x55AA; |