Settings in config.yaml file

config.yaml

@@ -0,0 +1,9 @@
+# Configuration file for scanner service
+# it is automatically re-loaded between scans
+start_freq: 10000.0
+stop_freq:  0.1
+freq_step_multiply: 0.95
+ampl: 1600
+interference_freq:      0.052
+interference_bandwidth: 0.008
+noise_scan: False

scanner.py

@@ -9,19 +9,11 @@ import time
 import pyodbc
 import math
 from datetime import datetime
+import yaml
+import os
 
 data_rows = []   # global 2-D list
-state = {
+state = {}
-    "ampl": 1600,
-    "remaining_receive_lines": 0,
-    "freq": 10000.0,
-    "freq_step_multiply": 0.85,
-    "stop_freq": 0.1,
-    "interference_freq":      0.052,
-    "interference_bandwidth": 0.008,
-    "initializing": 1,
-    "noise_scan": False
-}
 
 PATTERN = re.compile(
     r"Va=(?P<Va>-?\d+\.?\d*)\s+"
@@ -37,6 +29,19 @@ PATTERN = re.compile(
     r"(?P<adc_imax>[0-9a-fA-F]+)"       # Fourth hex
 )
 
+config_path = '/home/bart/python-scanner/config.yaml'
+
+def load_yaml_config(state_dict):
+    if os.path.exists(config_path):
+        with open(config_path, 'r') as f:
+            # Loader=yaml.SafeLoader is the secure way to load YAML
+            config_data = yaml.load(f, Loader=yaml.SafeLoader)
+            if config_data:
+                state_dict.update(config_data)
+    else:
+        print(f"Error: {config_path} not found.")
+
+# =============================================
 # Database connection parameters
 conn_str = (
     "DRIVER={FreeTDS};"
@@ -293,14 +298,14 @@ if __name__ == "__main__":
         reader.connect()
         while True:
             data_rows.clear()
-            state["ampl"]                    = 1600;
+
+            load_yaml_config(state)            # Load configuration settings
+
+            state["freq"]                    = state["start_freq"];
             state["remaining_receive_lines"] = 0;
-            state["freq"]                    = 1000;
-            state["freq_step_multiply"]      = 0.95;
-            state["stop_freq"]               = 0.1;
             state["initializing"]            = 1;
-            state["interference_freq"]       = 0.052;
+
-            state["interference_bandwidth"]  = 0.008
             reader.read_loop()
+
     finally:
         reader.disconnect()