Define conversion functions for TD, T and RH

src/common.h

@@ -1,6 +1,7 @@
 #ifndef MAD_CORE_COMMON_H
 #define MAD_CORE_COMMON_H
 
+#include "common/math.h"
 #include "common/types.h"
 #include "common/watchdog.h"
 

src/common/math.c

@@ -0,0 +1,43 @@
+#include "common.h"
+
+// https://bmcnoldy.earth.miami.edu/Humidity.html
+// https://onlinelibrary.wiley.com/doi/abs/10.1002/andp.18280890511
+// https://onlinelibrary.wiley.com/doi/abs/10.1002/andp.18441370202
+
+// NOTE: EXP and LN are exponential and natural logarithm functions
+
+// Dewpoint TD
+// 243.04*(LN(RH/100)+((17.625*T)/(243.04+T)))/
+// (17.625-LN(RH/100)-((17.625*T)/(243.04+T)))
+float Dewp(float t, float rh)
+{
+	// TODO
+	UNUSED(tc);
+	UNUSED(rh);
+
+	return 0.0f;
+}
+
+// Temperature T
+// 243.04*(((17.625*TD)/(243.04+TD))-LN(RH/100))/
+// (17.625+LN(RH/100)-((17.625*TD)/(243.04+TD)))
+float Temp(float td, float rh)
+{
+	// TODO
+	UNUSED(dc);
+	UNUSED(rh);
+
+	return 0.0f;
+}
+
+// Relative Humidity RH
+// 100*(EXP((17.625*TD)/(243.04+TD))/
+//      EXP((17.625*T)/(243.04+T)))
+float Rhum(float t, float td)
+{
+	// TODO
+	UNUSED(tc);
+	UNUSED(dc);
+
+	return 0.0f;
+}

src/common/math.h

@@ -0,0 +1,8 @@
+#ifndef MAD_CORE_COMMON_MATH_H
+#define MAD_CORE_COMMON_MATH_H
+
+float Dewp(float t, float rh);
+float Temp(float td, float rh);
+float Rhum(float t, float td);
+
+#endif // MAD_CORE_COMMON_MATH_H