Updates to allow pyvisa 1.11 dependency

docs_requirements.txt

@@ -51,8 +51,8 @@ pyparsing==2.4.7
 pyrsistent==0.17.3
 python-dateutil==2.8.1
 pytz==2020.1
-PyVISA==1.10.1
-PyVISA-sim-QCoDeS @ git+https://github.com/QCoDeS/pyvisa-sim.git@c23b02520e1966cd89c62e93b6db6790cb60f693
+PyVISA==1.11.1
+PyVISA-sim==0.4.0
 pywin32==228; sys_platform == 'win32'
 pywinpty==0.5.7; sys_platform == 'win32'
 PyYAML==5.3.1

qcodes/instrument/visa.py

@@ -3,13 +3,14 @@
 import warnings
 import logging
 
-import visa
+import pyvisa as visa
 import pyvisa.constants as vi_const
 import pyvisa.resources
 
 from .base import Instrument, InstrumentBase
 
 import qcodes.utils.validators as vals
+from qcodes.utils.deprecate import deprecate
 from qcodes.logger.instrument_logger import get_instrument_logger
 from qcodes.utils.delaykeyboardinterrupt import DelayedKeyboardInterrupt
 
@@ -52,7 +53,7 @@ def __init__(self, name: str, address: str, timeout: Union[int, float] = 5,
         super().__init__(name, **kwargs)
         self.visa_log = get_instrument_logger(self, VISA_LOGGER)
         self.visabackend: str
-        self.visa_handle: visa.ResourceManager
+        self.visa_handle: visa.resources.MessageBasedResource
         self.visalib: Optional[str]
 
         self.add_parameter('timeout',
@@ -119,7 +120,11 @@ def set_address(self, address: str) -> None:
             self.visabackend = 'ni'
 
         self.visa_log.info(f'Opening PyVISA resource at address: {address}')
-        self.visa_handle = resource_manager.open_resource(address)
+        resouce = resource_manager.open_resource(address)
+        if not isinstance(resouce, visa.resources.MessageBasedResource):
+            raise TypeError("QCoDeS only support MessageBasedResource "
+                            "Visa resources")
+        self.visa_handle = resouce
         self._address = address
 
     def device_clear(self) -> None:
@@ -136,12 +141,10 @@ def device_clear(self) -> None:
 
         if isinstance(self.visa_handle, pyvisa.resources.SerialInstrument):
             self.visa_handle.flush(
-                vi_const.VI_READ_BUF_DISCARD | vi_const.VI_WRITE_BUF_DISCARD)
+                vi_const.BufferOperation.discard_read_buffer_no_io | vi_const.BufferOperation.discard_write_buffer
+            )
         else:
-            status_code = self.visa_handle.clear()
-            if status_code is not None:
-                self.visa_log.warning(
-                    f"Cleared visa buffer with status code {status_code}")
+            self.visa_handle.clear()
 
     def set_terminator(self, terminator: str) -> None:
         r"""
@@ -158,10 +161,12 @@ def set_terminator(self, terminator: str) -> None:
         if self.visabackend == 'sim':
             self.visa_handle.write_termination = terminator
 
-    def _set_visa_timeout(self, timeout: Optional[Union[float, int]]) -> None:
-
+    def _set_visa_timeout(self, timeout: Optional[float]) -> None:
+        # according to https://pyvisa.readthedocs.io/en/latest/introduction/resources.html#timeout
+        # both float('+inf') and None are accepted as meaning infinite timeout
+        # however None does not pass the typechecking in 1.11.1
         if timeout is None:
-            self.visa_handle.timeout = None
+            self.visa_handle.timeout = float('+inf')
         else:
             # pyvisa uses milliseconds but we use seconds
             self.visa_handle.timeout = timeout * 1000.0
@@ -181,10 +186,10 @@ def close(self) -> None:
             self.visa_handle.close()
         super().close()
 
+    @deprecate(reason="pyvisa already checks the error code itself")
     def check_error(self, ret_code: int) -> None:
         """
         Default error checking, raises an error if return code ``!=0``.
-
         Does not differentiate between warnings or specific error messages.
         Override this function in your driver if you want to add specific
         error messages.
@@ -209,8 +214,7 @@ def write_raw(self, cmd: str) -> None:
         """
         with DelayedKeyboardInterrupt():
             self.visa_log.debug(f"Writing: {cmd}")
-            nr_bytes_written, ret_code = self.visa_handle.write(cmd)
-            self.check_error(ret_code)
+            self.visa_handle.write(cmd)
 
     def ask_raw(self, cmd: str) -> str:
         """

qcodes/instrument_drivers/QDev/QDac.py

@@ -1,7 +1,7 @@
 # QCoDeS driver for QDac. Based on Alex Johnson's work.
 
 import time
-import visa
+import pyvisa as visa
 import logging
 import numpy as np
 

qcodes/instrument_drivers/QDev/QDac_channels.py

@@ -1,7 +1,7 @@
 # QCoDeS driver for QDac using channels
 
 import time
-import visa
+import pyvisa as visa
 import logging
 import numpy as np
 

qcodes/instrument_drivers/QDevil/QDevil_QDAC.py

@@ -4,7 +4,7 @@
 # Version 2.1 QDevil 2020-02-10
 
 import time
-import visa
+import pyvisa as visa
 import logging
 
 from functools import partial

qcodes/instrument_drivers/QuantumDesign/DynaCoolPPMS/DynaCool.py

@@ -3,7 +3,7 @@
 import warnings
 from time import sleep
 
-from visa import VisaIOError
+from pyvisa import VisaIOError
 import numpy as np
 
 from qcodes.instrument.visa import VisaInstrument

qcodes/instrument_drivers/stahl/stahl.py

@@ -9,6 +9,8 @@
 from collections import OrderedDict
 from functools import partial
 
+from pyvisa.resources.serial import SerialInstrument
+
 from qcodes import VisaInstrument, InstrumentChannel, ChannelList
 from qcodes.utils.validators import Numbers
 
@@ -144,6 +146,8 @@ class Stahl(VisaInstrument):
 
     def __init__(self, name: str, address: str, **kwargs):
         super().__init__(name, address, terminator="\r", **kwargs)
+        assert isinstance(self.visa_handle, SerialInstrument)
+
         self.visa_handle.baud_rate = 115200
 
         instrument_info = self.parse_idn_string(

qcodes/instrument_drivers/tektronix/Keithley_2600.py

@@ -35,7 +35,7 @@ def __init__(self, name: str, address: str, channel: str,
 
         self._channel = channel
 
-        model = self.visa_handle.ask('print(localnode.model)')
+        model = self.visa_handle.query('print(localnode.model)')
 
         knownmodels = ['2601B', '2602A', '2602B', '2604B', '2611B', '2612B',
                        '2614B', '2635B', '2636B']

qcodes/tests/test_visa.py

@@ -1,7 +1,8 @@
 import warnings
 
 import pytest
-import visa
+import pyvisa as visa
+
 from qcodes.instrument.visa import VisaInstrument
 from qcodes.utils.validators import Numbers
 
@@ -19,7 +20,7 @@ def set_address(self, address):
         self.visabackend = self.visalib
 
 
-class MockVisaHandle:
+class MockVisaHandle(visa.resources.MessageBasedResource):
     """
     mock the API needed for a visa handle that throws lots of errors:
 
@@ -51,11 +52,9 @@ def write(self, cmd):
             raise ValueError('be more positive!')
 
         if num == 0:
-            ret_code = visa.constants.VI_ERROR_TMO
-        else:
-            ret_code = 0
+            raise visa.VisaIOError(visa.constants.VI_ERROR_TMO)
 
-        return len(cmd), ret_code
+        return len(cmd)
 
     def ask(self, cmd):
         if self.closed:
@@ -69,6 +68,14 @@ def query(self, cmd):
             raise ValueError("I'm out of fingers")
         return self.state
 
+    def set_visa_attribute(
+            self, name, state
+    ):
+        setattr(self, str(name), state)
+
+    def __del__(self):
+        pass
+
 
  # error args for set(-10)
 args1 = [

requirements.txt

@@ -61,7 +61,7 @@ pyparsing~=2.4.7
 pyrsistent~=0.17.3
 python-dateutil~=2.8.1
 pytz~=2020.1
-PyVISA~=1.10.1
+PyVISA~=1.11.1
 pywin32==228; sys_platform == 'win32'
 pywinpty~=0.5.7; sys_platform == 'win32'
 pyzmq~=19.0.2

setup.py

@@ -21,7 +21,7 @@ def readme():
 
 install_requires = [
     'numpy>=1.10',
-    'pyvisa>=1.9.1, <1.11',
+    'pyvisa>=1.9.1, <1.12',
     'h5py>=2.6',
     'websockets>=7.0',
     'jsonschema',

test_requirements.txt

@@ -30,8 +30,8 @@ pytest-forked==1.3.0
 pytest-mock==3.3.1
 pytest-rerunfailures==9.1.1
 pytest-xdist==2.1.0
-PyVISA==1.10.1
-PyVISA-sim-QCoDeS @ git+https://github.com/QCoDeS/pyvisa-sim.git@c23b02520e1966cd89c62e93b6db6790cb60f693
+PyVISA==1.11.1
+PyVISA-sim==0.4.0
 PyYAML==5.3.1
 requests==2.24.0
 six==1.15.0