Add RFG UDP source to rph_radar

python_app/hardware_full/laser_control/conversions.py

@@ -39,6 +39,18 @@ def current_ma_to_n(current_ma: float) -> int:
     Returns:
         Integer in [0, 65535] for the DAC.
     """
-    n = int(ADC_BITS_16 / 2000 * RREF * current_ma)
-    n = max(0, min(ADC_BITS_16, n))
-    return n
+    # Rounded like the lab GUI (_device_main.py), so both send identical DAC codes.
+    return max(0, min(ADC_BITS_16, round(ADC_BITS_16 / 2000 * RREF * current_ma)))
+
+
+def variation_codes(min_value: float, max_value: float, step: float) -> tuple[int, int, int]:
+    low, high, delta = (current_ma_to_n(value) for value in (min_value, max_value, step))
+    if delta == 0 or low >= high:
+        raise ValueError("Current variation range and step must be representable by the DAC")
+    return low, high, delta
+
+
+def variation_step_count(min_value: float, max_value: float, step: float) -> int:
+    """SWEEP_STEP edges per sweep: firmware loops ``while (current < max) current += delta`` on these codes."""
+    low, high, delta = variation_codes(min_value, max_value, step)
+    return math.ceil((high - low) / delta)