Added script to set the I2C switch on PCC

With this script the I2C switch on PCC can be set. By using an bash script multiple RCU2's can be programmed.

select_adc_on_PCC.py

+
+'''
+Copyright 2021 Stichting Nederlandse Wetenschappelijk Onderzoek Instituten,
+ASTRON Netherlands Institute for Radio Astronomy
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Set ADC
+
+'''
+import sys
+import time
+sys.path.insert(0,'.')
+import os
+
+if os.name =="posix":
+    from I2C_serial_pi import *
+else:
+    from I2C_serial import *
+    print("run on windows")
+
+
+if (len(sys.argv) < 2) :
+    print("\nUse: \npython select_adc_on_PCC.py <RCU_NR> \n")
+else :
+    RCU_nr = sys.argv[1]
+    if RCU_Nr < 3:
+        pr_stri = "Set RCU nr {}".format(RCU_nr)
+        print(pr_stri)
+        addr_switch = 0x70
+        I2C_device = I2C(addr_switch)
+        I2C_device.write_pointer(1 << RCU_nr)
+    elif RCU_Nr == 99:
+        pr_stri = "Set All RCU in parallel "
+        print(pr_stri)
+        addr_switch = 0x70
+        I2C_device = I2C(addr_switch)
+        I2C_device.write_pointer(0x0F)
+    else:
+        print("\nUse: \npython select_adc_on_PCC.py <RCU_NR 0..3 > \n")