From e1321edaddb4ef637c4561128c624e80751c00b6 Mon Sep 17 00:00:00 2001
From: Mark Standke <mstandke@cern.ch>
Date: Tue, 3 Jul 2018 23:24:51 +0200
Subject: [PATCH] ADD: This commit adds support of the prologix USB to GPIB
 controller as described here:
 http://prologix.biz/downloads/PrologixGpibUsbManual-4.2.pdf This enables GPIB
 usage with basil.

---
 basil/HL/hp_e3632a.yaml                   | 20 +++++++++
 basil/TL/PrologixVisa.py                  | 53 +++++++++++++++++++++++
 examples/lab_devices/prologix_pyvisa.yaml | 14 ++++++
 3 files changed, 87 insertions(+)
 create mode 100644 basil/HL/hp_e3632a.yaml
 create mode 100644 basil/TL/PrologixVisa.py
 create mode 100644 examples/lab_devices/prologix_pyvisa.yaml

diff --git a/basil/HL/hp_e3632a.yaml b/basil/HL/hp_e3632a.yaml
new file mode 100644
index 000000000..944b6be7c
--- /dev/null
+++ b/basil/HL/hp_e3632a.yaml
@@ -0,0 +1,20 @@
+# Device description for HP E3632A Powersupply.
+# set_ function expect a parameter, get_ function return a parameter.
+# Just the very basic commands are imlemented here.
+identifier : HEWLETT-PACKARD,E3632A,0,1.1-5.0-1.0
+on : OUTP ON
+off : OUTP OFF
+disp_on : DISP 1
+disp_off : DISP 0
+get_current : MEAS:CURR?
+set_current : SOUR:CURR
+set_voltage : SOUR:VOLT
+get_voltage : MEAS:VOLT?
+set_current_limit : CURR:PROT
+get_current_limit : CURR:PROT?
+set_voltage_limit : VOLT:PROT
+get_voltage_limit : VOLT:PROT?
+
+
+
+
diff --git a/basil/TL/PrologixVisa.py b/basil/TL/PrologixVisa.py
new file mode 100644
index 000000000..085e3559b
--- /dev/null
+++ b/basil/TL/PrologixVisa.py
@@ -0,0 +1,53 @@
+#
+# ------------------------------------------------------------
+# Copyright (c) All rights reserved
+# SiLab, Institute of Physics, University of Bonn
+# ------------------------------------------------------------
+#
+import visa
+import logging
+
+from basil.TL.TransferLayer import TransferLayer
+
+logger = logging.getLogger(__name__)
+
+
+class PrologixVisa(TransferLayer):
+    '''Transfer layer for a Virtual Instrument Software Architecture (VISA) provided by pyVisa.
+    Several interfaces are available (GPIB, RS232, USB, Ethernet). To be able to use pyVisa without
+    the proprietary NI-VISA driver a pyVisa backend pyVisa-py can be used.
+    GPIB under linux is not supported via pyVisa-py right now.
+    '''
+
+    def __init__(self, conf):
+        super(PrologixVisa, self).__init__(conf)
+        self._resource = None
+
+    def init(self):
+        '''
+        Initialize the device.
+        Parameters of visa.ResourceManager().open_resource()
+        '''
+        super(PrologixVisa, self).init()
+        backend = self._init.get('backend', '')  # Empty string means std. backend (NI VISA)
+        rm = visa.ResourceManager(backend)
+        try:
+            logger.info('BASIL VISA TL with %s backend found the following devices: %s', backend, ", ".join(rm.list_resources()))
+        except NotImplementedError:  # some backends do not always implement the list_resources function
+            logger.info('BASIL VISA TL with %s backend', backend)
+        self._resource = rm.open_resource(**{key: value for key, value in self._init.items() if key not in ("backend",)})
+
+    def close(self):
+        super(PrologixVisa, self).close()
+        self._resource.close()
+
+    def write(self, data):
+        self._resource.write(data)
+
+    def read(self):
+        self._resource.read()
+
+    def query(self, data):
+        self._resource.write("++auto 0")
+        self._resource.write(data)
+        return self._resource.query("++read eoi")
diff --git a/examples/lab_devices/prologix_pyvisa.yaml b/examples/lab_devices/prologix_pyvisa.yaml
new file mode 100644
index 000000000..220791f69
--- /dev/null
+++ b/examples/lab_devices/prologix_pyvisa.yaml
@@ -0,0 +1,14 @@
+transfer_layer:
+  - name     : PrologixVisa
+    type     : PrologixVisa
+    init     :
+        resource_name : ASRL::INSTR
+        read_termination : "\n"
+        backend : "@py"
+
+hw_drivers:
+  - name      : Powersupply
+    type      : scpi
+    interface : PrologixVisa
+    init      :
+        device : hp e3632a
\ No newline at end of file