From a8ac1f95c196385ec64e609e1c73beb1e28cee3d Mon Sep 17 00:00:00 2001
From: Andreas Neiser <neiser@kph.uni-mainz.de>
Date: Fri, 12 Apr 2013 20:24:13 +0200
Subject: [PATCH] users/mainz: Added script for power supply Elektro Automatik
 PS2384-05B

---
 users/mainz_kph_a2/psu.pl | 71 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100755 users/mainz_kph_a2/psu.pl

diff --git a/users/mainz_kph_a2/psu.pl b/users/mainz_kph_a2/psu.pl
new file mode 100755
index 0000000..b529725
--- /dev/null
+++ b/users/mainz_kph_a2/psu.pl
@@ -0,0 +1,71 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+use Device::SerialPort;
+
+&main;
+
+sub main {
+  my $port = setup_connection("/dev/ttyACM0");
+  my($U0,$I0,$OnOff0,$U0s,$I0s)=get_current_values($port, 0);
+  my($U1,$I1,$OnOff1,$U1s,$I1s)=get_current_values($port, 1);
+  printf("Output 0: %s %06.3fV (%06.3fV) %05.3fA (%05.3fA)\n", $OnOff0 ? "On" : "OFF" ,
+         $U0, $U0s, $I0, $I0s);
+  printf("Output 1: %s %06.3fV (%06.3fV) %05.3fA (%05.3fA)\n", $OnOff1 ? "On" : "OFF" ,
+         $U1, $U1s, $I1, $I1s);
+  $port->close or die "failed to close port";
+}
+
+sub get_current_values {
+  my $port = shift;
+  my $ch = shift;
+
+  my $response = send_and_read($port,"750047",$ch);
+  my($status1,$status2,$U,$I,$checksum) = unpack("x3CCnnn", $response);
+  my $response_set = send_and_read($port,"750048",$ch);
+  my($Uset,$Iset) = unpack("x5nnx", $response_set);
+
+  # do the weird calculation to physical values (depends on device)
+  $U = 84 * $U / 25600;
+  $I = 5 * $I / 25600;
+  my $OnOff = $status2 & 0x1;
+  $Uset = 84 * $Uset / 25600;
+  $Iset = 5 * $Iset / 25600;
+  return ($U, $I, $OnOff, $Uset, $Iset);
+}
+
+sub send_and_read {
+  my $port = shift;
+  my $msg = shift; # msg bytes as hex coded string (without checksum)
+  my $channel = shift || 0; # output 0 or 1?
+
+  my @msg_int = map { hex($_) } ($msg =~ /(\w\w)/g);
+  $msg_int[1] += $channel;
+
+  my $msg_bytes = join('', map { pack('C',$_) } @msg_int);
+  $msg_bytes .= pack('n', unpack('%16C*', $msg_bytes));
+  #print "Sending ",unpack('H*', $msg_bytes), "\n";
+  $port->write($msg_bytes) or die "Write failed";
+  # read response
+  my ($count,$saw)=$port->read(255); # will read _up to_ 255 chars
+  #print "Got $count bytes: ", unpack('H*', $saw), "\n";
+  return $saw;
+}
+
+sub setup_connection {
+  my $portname = shift;
+  my $port = Device::SerialPort->new($portname)
+    or die "Can't connect to $portname: $!";
+
+  # connection settings from ps2000b_programming.pdf
+  $port->baudrate(115200);
+  $port->databits(8);
+  $port->parity("odd");
+  $port->stopbits(1);
+  $port->write_settings or die "Can't write settings";
+  $port->read_char_time(0);     # don't wait for each character
+  $port->read_const_time(100); # 1 second per unfulfilled "read" call
+
+  return $port;
+}
-- 
2.43.0