Add padding before measurement windows

Author: maxbeer99

qupulse/hardware/dacs/atssimple.py

@@ -61,8 +61,7 @@ def _pad_and_validate_measurement_windows(
         self, windows: Dict[str, Tuple[numpy.ndarray, numpy.ndarray]]
     ) -> Dict[str, Tuple[numpy.ndarray, numpy.ndarray]]:
         """
-        Only non-overlapping measurement windows are allowed. Gaps are padded with
-        low-sample rate padding windows.
+        Only non-overlapping measurement windows are allowed. Gaps are padded with padding windows.
         """
 
         # Strip previous padding
@@ -80,6 +79,17 @@ def _pad_and_validate_measurement_windows(
         windows_flat[1] = windows_flat[1][args]
 
         padding_windows = [numpy.array([]), numpy.array([])]
+        # Prepend padding in case that the first measurement window starts with some delay
+        if windows_flat[0][0] > 0:
+            padding_windows[0] = numpy.append(
+                padding_windows[0], 0
+            )
+            padding_windows[1] = numpy.append(
+                padding_windows[1],
+                windows_flat[0][0]
+            )
+
+        # Pad between windows
         for index in range(len(windows_flat[0]) - 1):
             # Raise error if windows overlap
             if (
@@ -153,7 +163,7 @@ def register_operations(
         """
 
         if not "_padding" in operations.keys():
-            operations["_padding"] = 1  # 1 Hz padding acquisition padding
+            operations["_padding"] = 125000000  # 125000000 Hz acquisition padding
 
         self.registered_programs[program_name]["operations"] = operations