From c3ad1606457e2a2048cc9619687d49ff032e6740 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ovidio=20Y=2E=20Pe=C3=B1a=20Rodr=C3=ADguez?=
 <ovidio@bytesfall.com>
Date: Fri, 14 Jun 2024 10:11:27 +0200
Subject: [PATCH 1/2] Added support for C type TCs.

---
 include/mcc134.h |  2 ++
 lib/mcc134.c     |  2 +-
 lib/nist.c       | 77 +++++++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 73 insertions(+), 8 deletions(-)

diff --git a/include/mcc134.h b/include/mcc134.h
index df0852f..abb7baf 100644
--- a/include/mcc134.h
+++ b/include/mcc134.h
@@ -49,6 +49,8 @@ enum TcTypes
     TC_TYPE_B   = 6,
     /// N type
     TC_TYPE_N   = 7,
+    /// C type
+    TC_TYPE_C   = 8,
     /// Input disabled
     TC_DISABLED = 0xFF
 };
diff --git a/lib/mcc134.c b/lib/mcc134.c
index 205bfda..8883ebe 100644
--- a/lib/mcc134.c
+++ b/lib/mcc134.c
@@ -972,7 +972,7 @@ int mcc134_tc_type_write(uint8_t address, uint8_t channel, uint8_t type)
 
     if (!_check_addr(address) ||
         (channel >= NUM_TC_CHANNELS) ||
-        ((type > TC_TYPE_N) && (type != TC_DISABLED)))
+        ((type > TC_TYPE_C) && (type != TC_DISABLED)))
     {
         return RESULT_BAD_PARAMETER;
     }
diff --git a/lib/nist.c b/lib/nist.c
index da89996..02c24c1 100644
--- a/lib/nist.c
+++ b/lib/nist.c
@@ -4,6 +4,8 @@
 *   brief This file contains NIST thermocouple linearization functions.
 *
 *   date 1 Feb 2018
+*
+*   14 Jun 2024 Added C Type TC (Ovidio Y. Pena Rodriguez)
 */
 #include <math.h>
 #include "nist.h"
@@ -12,7 +14,7 @@
 //
 // The following types are supported:
 //
-//	J, K, R, S, T, N, E, B
+//	J, K, R, S, T, N, E, B, C
 enum tcTypes
 {
     TC_TYPE_J = 0,
@@ -22,7 +24,8 @@ enum tcTypes
     TC_TYPE_R,
     TC_TYPE_S,
     TC_TYPE_B,
-    TC_TYPE_N
+    TC_TYPE_N,
+    TC_TYPE_C
 };
 
 
@@ -641,10 +644,65 @@ const NIST_Reverse_type TypeBReverseTable =
 	TypeBReverse
 };
 
+// ****************************************************************************
+// Type C data
+
+const double TypeCTable0[] =
+{
+	 0.0000000E+00,
+     7.4411468E+01,
+    -4.5680255E+00,
+     6.0972079E-01,
+    -5.5888380E-02,
+     2.9645590E-03,
+    -6.5745000E-05
+};
+
+const double TypeCTable1[] =
+{
+	 4.1102500E+02,
+    -6.1463789E+01,
+     1.4651879E+01,
+    -9.9683382E-01,
+     3.7141869E-02,
+    -7.0836000E-04,
+     5.5012700E-06
+};
+
+const NIST_Table_type TypeCTables[] =
+{
+	{
+		7,
+		0.0,
+		TypeCTable0
+	},
+	{
+		7,
+		11.3,
+		TypeCTable1
+	}
+};
+
+const double TypeCReverse[] =
+{
+	-2.344710E-01,
+     7.190027E-03,
+     3.956443E-06,
+    -1.842722E-09,
+     3.471851E-13,
+    -2.616792E-17
+};
+
+const NIST_Reverse_type TypeCReverseTable =
+{
+	6,						// nCoefficients
+	TypeCReverse
+};
+
 
 // ****************************************************************************
 
-const Thermocouple_Data_type ThermocoupleData[8] =
+const Thermocouple_Data_type ThermocoupleData[9] =
 {
 	{
 		3, 							// nTables
@@ -685,6 +743,11 @@ const Thermocouple_Data_type ThermocoupleData[8] =
 		3, 							// nTables
 		&TypeNReverseTable, 		// Reverse Table
 		TypeNTables					// Tables
+	},
+	{
+		2, 							// nTables
+		&TypeCReverseTable, 		// Reverse Table
+		TypeCTables					// Tables
 	}
 };
 
@@ -696,9 +759,9 @@ double NISTCalcVoltage(unsigned int type, double temp)
 	double fTemp;
 	double fExtra = 0.0;
 
-	if (type > TC_TYPE_N)
+	if (type > TC_TYPE_C)
     {
-        type = TC_TYPE_N;
+        type = TC_TYPE_C;
     }
 	
 	// select appropriate NIST table data
@@ -740,9 +803,9 @@ double NISTCalcTemperature(unsigned int type, double voltage)
 	double fVoltage;
 	double fResult;
 	
-	if (type > TC_TYPE_N)
+	if (type > TC_TYPE_C)
 	{
-		type = TC_TYPE_N;
+		type = TC_TYPE_C;
 	}
 
 	// determine which temp range table to use with the threshold V

From b86bcea9ed67c30f80cf0b79d76b9b21a0ae7ac8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ovidio=20Y=2E=20Pe=C3=B1a=20Rodr=C3=ADguez?=
 <ovidio@bytesfall.com>
Date: Fri, 21 Jun 2024 16:37:56 +0200
Subject: [PATCH 2/2] Updated the inverse polynomial for type C thermocouples.

---
 lib/nist.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/lib/nist.c b/lib/nist.c
index 02c24c1..46cbe91 100644
--- a/lib/nist.c
+++ b/lib/nist.c
@@ -685,17 +685,18 @@ const NIST_Table_type TypeCTables[] =
 
 const double TypeCReverse[] =
 {
-	-2.344710E-01,
-     7.190027E-03,
-     3.956443E-06,
-    -1.842722E-09,
-     3.471851E-13,
-    -2.616792E-17
+	 0.00000E00,
+     1.33300E-02,
+     1.25261E-05,
+    -1.08382E-08,
+     3.70800E-12,
+    -4.64562E-16,
+    -1.35135E-20
 };
 
 const NIST_Reverse_type TypeCReverseTable =
 {
-	6,						// nCoefficients
+	7,						// nCoefficients
 	TypeCReverse
 };