Diff: app/ad4110_temperature_sensor.cpp

Revision:

0:6ca37a8f8ba9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/ad4110_temperature_sensor.cpp	Wed Jul 27 17:04:15 2022 +0530
@@ -0,0 +1,111 @@
+/***************************************************************************//*
+ * @file    ad4110_temperature_sensor.cpp
+ * @brief   AD4110 temperature sensor functionality
+ * @details
+******************************************************************************
+ * Copyright (c) 2022 Analog Devices, Inc. All Rights Reserved.
+ *
+ * This software is proprietary to Analog Devices, Inc. and its licensors.
+ * By using this software you agree to the terms of the associated
+ * Analog Devices Software License Agreement.
+******************************************************************************/
+
+/******************************************************************************/
+/***************************** Include Files **********************************/
+/******************************************************************************/
+
+#include <stdint.h>
+#include <ptxxx.h>
+#include <thermocouple.h>
+#include "ad4110_temperature_sensor.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif //  _cplusplus
+
+#include "app_config.h"
+#include "ad4110_support.h"
+
+#ifdef __cplusplus  // Closing extern c
+}
+#endif //  _cplusplus
+
+/******************************************************************************/
+/********************* Macros and Constants Definitions ***********************/
+/******************************************************************************/
+
+/* NTC thermistor Rsense value (in ohms) */
+#define NTC_RSENSE			10000U
+
+/* RTD Rref Resistance value (in ohms) */
+#define RTD_RREF			25000U
+
+/* Lead resistance value (in ohms)
+* NOTE: There is an RC filter configuration physically in series with the AIN+
+* and AIN- terminals, (10 + 10 ohms) that needs to be compensated for during conversion. */
+#define LEAD_RESISTANCE			20
+
+/* Scale factor for TMP36 used for CJC */
+#define TMP36_SCALE			0.03
+
+/******************************************************************************/
+/******************** Variables and User Defined Data Types *******************/
+/******************************************************************************/
+
+/******************************************************************************/
+/************************** Functions Definitions *****************************/
+/******************************************************************************/
+
+/**
+ * @brief Convert ADC raw value into equivalent RTD temperature
+ * @param rtd_sample[in] - Raw ADC sample for RTD sensor
+ * @return RTD temperature
+ * @note Fixed PT100 RTD sensor is used
+ */
+float get_rtd_temperature(uint32_t rtd_sample)
+{
+	PT100 rtd_sensor;
+	float rtd_resistance;
+
+	rtd_resistance = convert_adc_raw_into_rtd_resistance(rtd_sample, RTD_RREF);
+	/* The lead resistance value is compensated to achieve accuracy in resistance and temperature
+	measurement */
+	rtd_resistance = rtd_resistance - LEAD_RESISTANCE;
+	return rtd_sensor.convertResistanceToTemperature(rtd_resistance);
+}
+
+
+/**
+ * @brief Convert ADC raw value into TC temperature
+ * @param tc_sample[in] - Raw TC sample
+ * @param tc_channel[in] - Thermocouple channel
+ * @param cjc_sample[in] - Raw CJC sample
+ * @param cjc_channel[in - CJC channel
+ * @param cjc_temp[in, out] - CJC temperature value
+ * @return TC temperature
+ * @note T type thermocouple used, on board TMP36 is used for CJC.
+ */
+float get_tc_temperature(uint32_t tc_sample, uint8_t tc_channel,
+			 uint32_t cjc_sample, uint8_t cjc_channel,
+			 float *cjc_temp)
+{
+	Thermocouple_Type_T tcSensor;
+	float tc_mv;
+	volatile float cjc_mv;
+	float tc_temperature;
+	float cjc_temperature;
+
+	/* Thermocouple temperature calculation */
+	tc_mv = convert_adc_sample_into_voltage(tc_sample, tc_channel) * 1000;
+	tc_temperature = tcSensor.convert(tc_mv);
+
+	/* CJC Temperature calculation */
+	cjc_mv = convert_adc_sample_into_voltage(cjc_sample, cjc_channel) * 1000;
+	cjc_temperature  = TMP36_SCALE * cjc_mv;
+
+	/* Get the CJC temperature */
+	*cjc_temp = cjc_temperature;
+
+	return (tc_temperature + cjc_temperature);
+}
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