Index: firmware/App/Drivers/ConductivityTeensy.h
===================================================================
diff -u
--- firmware/App/Drivers/ConductivityTeensy.h	(revision 0)
+++ firmware/App/Drivers/ConductivityTeensy.h	(revision 011ea36116a350c145cea26774fba1966c365430)
@@ -0,0 +1,142 @@
+/**************************************************************************
+*
+* Copyright (c) 2025-2026 Diality Inc. - All Rights Reserved.
+*
+* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+*
+* @file    ConductivityTeensy.h
+*
+* @author  (last)      Arpita Srivastava
+* @date    (last)      3-Nov-2025
+*
+* @author  (original)  Arpita Srivastava
+* @date    (original)  3-Nov-2025
+*
+***************************************************************************/
+
+#ifndef _CONDUCTIVITY_TEENSY_H_
+#define _CONDUCTIVITY_TEENSY_H_
+
+#include "DDCommon.h"
+
+// ********** public definitions **********
+#define DOUBLE_COUNT                8                                    ///< Number of double values in Teensy EEPROM data
+#define FLOAT_COUNT                 ((128 - (DOUBLE_COUNT * 8)) / 4)     ///< Number of float values in Teensy EEPROM data
+
+typedef enum TeensySensorIndex
+{
+    TEENSY_SENSOR_0 = 0,                            ///< Maps to D17_COND
+    TEENSY_SENSOR_1,                                ///< Maps to D27_COND
+    TEENSY_SENSOR_2,                                ///< Maps to D43_COND
+    TEENSY_SENSOR_3,                                ///< Maps to D74_COND
+    TEENSY_SENSOR_4,                                ///< Maps to P9_COND
+    TEENSY_SENSOR_5,                                ///< Maps to P18_COND
+    MAX_TEENSY_SENSOR                               ///< Total number of mapped sensors
+} TEENSY_SENSOR_INDEX_T;
+
+/// Initialization status of all the sensors connected to Teensy
+typedef enum Conductivity_Init_Status
+{
+    CONDUCTIVITY_INIT_STATUS_UNITIALIZED = 0,       ///< The initialization process has not started.
+    CONDUCTIVITY_INIT_STATUS_IN_PROGRESS,           ///< The initialization process has started.
+    CONDUCTIVITY_INIT_STATUS_INITIALIZED,           ///< Initialization process completed and all the sensors were initialized successfully.
+    CONDUCTIVITY_INIT_STATUS_FAILED                 ///< Initialization process completed but one or more sensor was not initialized properly.
+}CONDUCTIVITY_INIT_STATUS_T;
+
+
+typedef enum Conductivity_Parse_Status
+{
+    CONDUCTIVITY_PARSE_SUCCESS = 0,
+    CONDUCTIVITY_PARSE_ERROR_NULL_BUFFER,
+    CONDUCTIVITY_PARSE_ERROR_INVALID_LENGTH,
+    CONDUCTIVITY_PARSE_ERROR_INVALID_SENSOR_NUM
+} CONDUCTIVITY_PARSE_STATUS;
+
+/// Enumeration of FPGA states.
+typedef enum Conductivity_Comm_States
+{
+    COND_COMM_STATE_START = 0,
+    COND_COMM_STATE_SEND_CMD,
+    COND_COMM_STATE_RCV_RSPNS,
+    COND_COMM_STATE_SEND_CMD_INIT_SENSOR,
+    COND_COMM_STATE_RCV_RSPNS_INIT_SENSOR,
+    COND_COMM_STATE_SEND_CMD_GET_INIT_STATUS,
+    COND_COMM_STATE_RCV_RSPNS_GET_INIT_STATUS,
+    COND_COMM_STATE_SEND_CMD_UPDATE_EEPROM_DATA,
+    COND_COMM_STATE_RCV_RSPNS_UPDATE_EEPROM_DATA,
+    COND_COMM_STATE_SEND_CMD_GET_EEPROM_DATA,
+    COND_COMM_STATE_RCV_RSPNS_GET_EEPROM_DATA,
+    COND_COMM_STATE_SEND_CMD_UPDATE_MEASUREMENT_SETTINGS,
+    COND_COMM_STATE_RCV_RSPNS_UPDATE_MEASUREMENT_SETTINGS,
+    COND_COMM_STATE_SEND_CMD_GET_MEASUREMENT_SETTINGS,
+    COND_COMM_STATE_RCV_RSPNS_GET_MEASUREMENT_SETTINGS,
+    COND_COMM_STATE_SEND_CMD_GET_MEASUREMENT,
+    COND_COMM_STATE_RCV_RSPNS_GET_MEASUREMENT,
+    COND_COMM_STATE_FAILED,
+    NUM_OF_COND_COMM_STATES
+} CONDUCTIVITY_COMM_STATE_T;
+
+typedef struct
+{
+    F64 A0;
+    F64 A1;
+    F64 B0;
+    F64 B1;
+    F64 B2;
+    F64 B3;
+}CONDUCTIVITY_COEFFICIENTS_T;
+
+
+///  Structure to receive Sensor Measurement data from Teensy
+#pragma pack(push, 1)
+typedef struct
+{
+    U32 sensorNum;                                  ///< Conductivity Sensor number i.e unit 1 to 6.
+    F32 impFreq;                                    ///< Impedance Frequency
+    U32 impDataPoints;                              ///< Impedance Data Points. Hard coded to 1
+    F32 impRzMag;                                   ///< Value of medianMag
+    F32 impRzPhase;                                 ///< Value of medianPhase
+    F32 rtdFreq;                                    ///< RTD Frequency. Hard coded to 0.0
+    U32 rtdDataPoints;                              ///< Impedance Data Points. Hard coded to 1
+    F32 rtdRzMag;                                   ///< Value of rtd_resistance
+    F32 rtdRzPhase;                                 ///< RTD Rz Phase. Hard coded to 0.0
+} CONDUCTIVITY_SENSOR_DATA_T;
+#pragma pack(pop)
+
+/// Structure to receive EEPROM data from Teensy. These are coefficient values to calculate conductivity and temperature.
+#pragma pack(push, 1)
+typedef struct
+{
+    F64 doubleValue[DOUBLE_COUNT];                  ///< Double Values stored in the EEPROM
+    F32 floatValue[FLOAT_COUNT];                    ///< Float Values stored in the EEPROM
+} CONDUCTIVITY_EEPROM_DATA_T;
+#pragma pack(pop)
+
+///  Structure to receive conductivity measurement settings from Teensy
+#pragma pack(push, 1)
+typedef struct
+{
+    F32 SinFreq;
+    F32 DacVoltPP;
+    F32 BiasVolt;
+    U32 HstiaRtiaSel;
+    U32 AdcPgaGain;
+    U32 DftNum;
+    U32 ADCAvgNum;
+} CONDUCTIVITY_MEASUREMENT_SETTINGS_T;
+#pragma pack(pop)
+
+typedef struct
+{
+    F64 Conductivity;
+    F64 Temperature;
+}CONDUCTIVITY_CALCULATED_MEASUREMENTS_T;
+
+// ********** public function prototypes **********
+void initConductivityDMAchannels( void );
+void execConductivityCommunication( void );
+F64 getImpedanceValue( U32 sensorNum );
+F64 getRTDValue( U32 sensorNum );
+
+#endif /* _CONDUCTIVITY_TEENSY_H_ */