Diff: MAX11410.cpp

Revision:

3:658a93dfb2d8

Parent:

2:eac67184cc0c

Child:

4:c169ba85d673

--- a/MAX11410.cpp	Fri Dec 20 23:46:49 2019 +0000
+++ b/MAX11410.cpp	Tue Dec 24 00:09:37 2019 +0000
@@ -423,6 +423,10 @@
     VRef_AVDD = 3.300;
     
     //----------------------------------------
+    // Temperature calculated from RTD Resistance; Thermocouple Cold Junction, in degrees C
+    RTD_Temperature = 25.0;
+    
+    //----------------------------------------
     // shadow of register ctrl CMD_r000_1001_dddd_dddd_CTRL
     ctrl = 0x01;
     
@@ -1620,7 +1624,7 @@
 }
 
 //----------------------------------------
-// Menu item 'R'
+// Menu item 'RM'
 // Trigger Measurement for Resistive Temperature Device (RTD).
 //
 // Example code for typical RTD measurement.
@@ -1632,7 +1636,7 @@
 // @param[in] rtd_ainn = channel RTD low side, default=AINN_SEL_1001_AIN9
 // @post AINcode[rtd_ainp]: measurement result LSB code
 //
-// @return ideal voltage calculated from raw LSB code and reference voltage
+// @return resistance calculated from raw LSB code and reference resistance
 double MAX11410::Measure_RTD(MAX11410_AINP_SEL_enum_t rtd_iout, MAX11410_AINP_SEL_enum_t rtd_ainp, MAX11410_AINN_SEL_enum_t rtd_ainn)
 {
     
@@ -1693,6 +1697,33 @@
 }
 
 //----------------------------------------
+// Menu item 'RT'
+// Return the physical temperature corresponding to measured resistance
+// of a PT1000 type Resistive Temperature Device (RTD).
+//
+// @param[in] rtd_resistance = RTD resistance in ohms, default=1000
+//
+// @return ideal temperature in degrees C, calculated from RTD resistance in ohms
+// @test TemperatureOfRTD_PT1000(1000.0) expect 0.00             PT1000 at 0 deg C
+// @test TemperatureOfRTD_PT1000(1100.0) expect 25.00            PT1000 at 25 deg C
+//
+double MAX11410::TemperatureOfRTD_PT1000(double rtd_resistance)
+{
+    
+    //----------------------------------------
+    // warning -- WIP work in progress
+    #warning "Not Tested Yet: MAX11410::TemperatureOfRTD_PT1000..."
+    
+    //----------------------------------------
+    // Temperature from RTD Resistance maths
+    // TODO: define R0 = 1000 ohms for PT1000
+    // TODO: define standard RTD coefficients
+    // TODO: calculate T from R and R0
+    RTD_Temperature = 25.00;
+    return RTD_Temperature;
+}
+
+//----------------------------------------
 // Configure Measurement for Thermocouple
 //
 // Example code for typical Thermocouple measurement.
@@ -1726,7 +1757,7 @@
 }
 
 //----------------------------------------
-// Menu item 'T'
+// Menu item 'TM'
 // Trigger Measurement for Thermocouple
 //
 // Example code for typical Thermocouple measurement.
@@ -1761,5 +1792,32 @@
     return VoltageOfCode(AINcode[((int)rtd_ainp & 0x0F)]);
 }
 
+//----------------------------------------
+// Menu item 'TK'
+// Return the physical temperature corresponding to measured voltage
+// of a type K Thermocouple (TC).
+//
+// @pre {0}.RTD_Temperature = cold junction temperature, in degrees C
+// @param[in] tc_voltage = Thermocouple voltage in volts, default=0.0254
+//
+// @return ideal temperature in degrees C, calculated from RTD resistance in ohms
+// @test TemperatureOfTC_TypeK(0.123) expect 0.00             TC_TypeK at 0 deg C
+// @test TemperatureOfTC_TypeK(0.456) expect 25.00            TC_TypeK at 25 deg C
+//
+double MAX11410::TemperatureOfTC_TypeK(double tc_voltage)
+{
+    
+    //----------------------------------------
+    // warning -- WIP work in progress
+    #warning "Not Tested Yet: MAX11410::TemperatureOfTC_TypeK..."
+    
+    //----------------------------------------
+    // Temperature from TC_TypeK voltage maths
+    // TODO: define standard TC_TypeK coefficients
+    // TODO: calculate deltaT from tc_voltage
+    double deltaT = 0;
+    return deltaT + RTD_Temperature; // cold junction
+}
+
 
 // End of file