Added ADC measurements

laser_control/conversions.py

@@ -14,6 +14,7 @@ from .constants import (
     RREF,
     BETA_INTERNAL, BETA_EXTERNAL, T0_K, R0,
     ADC_BITS_16, ADC_BITS_12,
+    STM32_ADC_PIN_VREF,
     U3V3_COEFF, U5V_COEFF, U7V_COEFF,
 )
 
@@ -111,4 +112,15 @@ def voltage_5v_n_to_v(n: int) -> float:
 
 def voltage_7v_n_to_v(n: int) -> float:
     """Convert 7V rail ADC count to volts."""
-    return n * U7V_COEFF
+    return n * U7V_COEFF
+
+
+def stm32_adc_pin_n_to_v(n: int) -> float:
+    """
+    Convert a raw 12-bit STM32 ADC code from a direct MCU input pin to volts.
+
+    The new auxiliary telemetry channels are measured directly on PF3/PF4
+    without an external divider in the firmware path, so the conversion is a
+    plain ratio against the MCU analog reference rail.
+    """
+    return n * STM32_ADC_PIN_VREF / ADC_BITS_12