From 9f7ddb48286720734bdfe9dde644a95d1a47e642 Mon Sep 17 00:00:00 2001
From: "Eugeniy E. Mikhailov" <evgmik@gmail.com>
Date: Sun, 2 Jan 2022 12:33:02 -0500
Subject: small refining of the SCPI_PROPERTY

---
 qolab/hardware/scpi.py | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

(limited to 'qolab')

diff --git a/qolab/hardware/scpi.py b/qolab/hardware/scpi.py
index 42f25b4..d80a546 100644
--- a/qolab/hardware/scpi.py
+++ b/qolab/hardware/scpi.py
@@ -23,7 +23,14 @@ def response2numStr(strIn, firstSeparator=None, unit=None):
     return (prefix, numberString, unit)
 
 class SCPI_PROPERTY(property):
-    """ Overrides property class and makes it suitable for SCPI set and query notation """
+    """ 
+    Overrides property class and makes it suitable for SCPI set and query notation.
+    Works within SCPIinstr class since it assumes that owner has query() and write().
+        scpi_prfx - SCPI command prefix to get/set property, for example 'FreqInt'
+                    query formed as 'scpi_prfx?' and setter as 'scpi_prfx val'
+        ptype     - property type 'str', 'int', 'float', ...
+        doc       - short description of property, for example 'Internal lockin frequency'
+    """
     def __init__(self, scpi_prfx=None, ptype=str, doc=None):
         super().__init__(fget=self.get_scpi, fset=self.set_scpi)
         self.scpi_prfx = scpi_prfx
@@ -31,11 +38,10 @@ class SCPI_PROPERTY(property):
         self.__doc__ = doc
 
     def get_scpi(self, owner):
-        print(f'{self.scpi_prfx}?')
-        return self.ptype( '443' )
+        return self.ptype( owner.query(f'{self.scpi_prfx}?') )
 
     def set_scpi(self, owner, val):
-        print(f'{self.scpi_prfx} {val}')
+        return owner.write(f'{self.scpi_prfx} {val}')
 
     def __repr__(self):
         s = [ f'{self.__class__.__name__}(' ]
@@ -107,10 +113,18 @@ class SCPIinstr:
 
 
 if __name__ == '__main__': 
-    class DummyInstrument():
-        def fz(self):
-            """ I am  fz """
-            return 34
+    from qolab.hardware.basic import BasicInstrument
+    class DummyInstrument(BasicInstrument):
+        def __init__(self, *args, **kwargs):
+            super().__init__(*args, **kwargs)
+
+        def write(self, str):
+            print(f'write: {str=}')
+
+        def query(self, str):
+            print(f'query: {str=}')
+            return '123'
+
         x = SCPI_PROPERTY(scpi_prfx='SETX', ptype=str, doc='property X')
         y = SCPI_PROPERTY(scpi_prfx='SETY', ptype=int, doc='property Y')
 
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