plot_sayma_data: Add option to skip data plotting

plot_sayma_data.py

@@ -31,6 +31,9 @@ def main():
     parser.add_argument("--log",
         help="path of the log file where the measurement record will be appended",
         type=str)
+    parser.add_argument("--noplot",
+        help="do not show data plot, which is blocking until the GUI is closed",
+        action="store_true")
     args = parser.parse_args()
 
     # Must only compare 2 data
@@ -77,12 +80,13 @@ def main():
     # Print the phase difference
     print(angle)
 
-    # Normalize y1 and y2 for plotting
-    y1 /= abs(y1).max()
-    y2 /= abs(y2).max()
-    plot.plot(y1)
-    plot.plot(y2)
-    plot.show()
+    if not args.noplot:
+        # Normalize y1 and y2 for plotting
+        y1 /= abs(y1).max()
+        y2 /= abs(y2).max()
+        plot.plot(y1)
+        plot.plot(y2)
+        plot.show()
 
 if __name__ == "__main__":
     main()