Diff: MAX31856.cpp

Revision:

8:8723d0006097

Parent:

7:2e45068189b1

Child:

9:2d284cc2f65c

diff -r 2e45068189b1 -r 8723d0006097 MAX31856.cpp
--- a/MAX31856.cpp	Mon Jul 31 18:46:49 2017 +0000
+++ b/MAX31856.cpp	Tue Aug 01 03:29:15 2017 +0000
@@ -3,6 +3,7 @@
 
 #define LOG(args...)    printf(args)
 
+//*****************************************************************************
 MAX31856::MAX31856(SPI& _spi, PinName _ncs, uint8_t _type, uint8_t _fltr, uint8_t _samples, uint8_t _conversion_mode) : spi(_spi), ncs(_ncs), samples(_samples) {  
     spi.format(8,3); //configure the correct SPI mode to beable to program the registers intially correctly
     setThermocoupleType(_type);
@@ -14,27 +15,44 @@
 
 //*****************************************************************************
 float MAX31856::readTC()
-{
+{    
+    //Check and see if the MAX31856 is set to conversion mode ALWAYS ON
+    if (conversion_mode==0) {   //means that the conversion mode is normally off
+        setOneShotMode(CR0_1_SHOT_MODE_ONE_CONVERSION); // turn on the one shot mode for singular conversion
+        thermocouple_conversion_count=0; //reset the conversion count back to zero to make sure minimum conversion time reflects one shot mode requirements
+    }
+    
+    //calculate minimum wait time for conversions
+    calculateDelayTime();
+    
+    //initialize other info for the read functionality
     int32_t temp;
     uint8_t buf_read[3], buf_write[3]={ADDRESS_LTCBH_READ,ADDRESS_LTCBM_READ,ADDRESS_LTCBL_READ};
     
-//    uint32_t time = us_ticker_read();
-//    uint32_t duration = time - lastReadTime;
-//    if (duration > 200000) {   // more than 250ms
-        for(int i=0; i<3; i++) {
-            spiEnable();
-            buf_read[i]=spi.write(buf_write[i]);
-            buf_read[i]=spi.write(buf_write[i]);
-            spiDisable();
-        }   
-        
-        //Convert the registers contents into the correct value
-        temp =((buf_read[0] & 0xFF) << 11);       //Shift Byte 2 into place
-        temp|=((buf_read[1] & 0xFF) << 3);        //Shift Byte 1 into place
-        temp|=((buf_read[2] & 0xFF) >> 5);        //Shift Byte 0 into place
-        float val=(temp/128.0f);                  //Divide the binary string by 2 to the 7th power
-        return val;
-//  }
+    bool read_thermocouple_temp=checkFaultsThermocoupleConnection(); //check and see if there are any faults that prohibit a normal read of the register
+    
+    if(read_thermocouple_temp){ //no faults with connection are present so continue on with normal read of temperature
+        uint32_t time = us_ticker_read();
+        uint32_t duration = time - lastReadTime;
+        if (duration > conversion_time) {   // more than current conversion time
+            for(int i=0; i<3; i++) {
+                spiEnable();
+                buf_read[i]=spi.write(buf_write[i]);
+                buf_read[i]=spi.write(buf_write[i]);
+                spiDisable();
+            }   
+            
+            //Convert the registers contents into the correct value
+            temp =((buf_read[0] & 0xFF) << 11);       //Shift Byte 2 into place
+            temp|=((buf_read[1] & 0xFF) << 3);        //Shift Byte 1 into place
+            temp|=((buf_read[2] & 0xFF) >> 5);        //Shift Byte 0 into place
+            float val=(temp/128.0f);                  //Divide the binary string by 2 to the 7th power
+            return val;
+        }
+    }
+    checkFaultsThermocoupleThresholds();  //print any faults to the terminal
+    
+    thermocouple_conversion_count++; //iterate the conversion count to speed up time in between future converions in always on mode
 }
 
 
@@ -56,9 +74,113 @@
     temp|=((int32_t)(buf_read[2] >> 2));        //Shift the LSB into place
     float val=((float)(temp/64.0));             //Divide the binary string by 2 to the 6th power
     
+    checkFaultsColdJunctionThresholds(); //print any faults to the terminal
+    
     return val;
 }
 
+//*****************************************************************************
+uint8_t MAX31856::checkFaultsThermocoupleThresholds()
+{  
+    uint8_t fault_byte=registerReadByte(ADDRESS_SR_READ); //Read contents of fault status register
+    uint8_t temp[2], return_int;
+    for(int i=0; i<2; i++)
+        temp[i]=fault_byte;
+    
+    //Check if any of the faults for thermocouple connection are triggered
+    if      ((fault_byte&0x4C)==0) //means no fault is detected for thermocouple thresholds
+        return_int=0;
+    else {
+        if ((fault_byte&0x40)==0) {   //check if normal operation of thermocouple is true
+            if      (temp[0]&0x08) {
+                LOG("FAULT! Thermocouple temp is higher than the threshold that is set!\r\n");
+                return_int=1;
+            }
+            else if (temp[1]&0x04) {
+                LOG("FAULT! Thermocouple temp is lower than the threshold that is set!\r\n");
+                return_int=2;
+            }
+        }
+        else {                      //Thermocouples is operating outside of normal range
+            LOG("FAULT! Thermocouple temperature is out of range for specific type of thermocouple!\r\n");
+            if      (temp[0]&0x08) {
+                LOG("FAULT! Thermocouple temp is higher than the threshold that is set!\r\n");
+                return_int=4;
+            }
+            else if (temp[1]&0x04) {
+                LOG("FAULT! Thermocouple temp is lower than the threshold that is set!\r\n");
+                return_int=5;
+            }
+            else                    //no other faults are flagged besides unnatural operation
+                return_int=3; 
+        }
+    }
+    return return_int;
+}
+
+//*****************************************************************************
+uint8_t MAX31856::checkFaultsColdJunctionThresholds()
+{  
+    uint8_t fault_byte=registerReadByte(ADDRESS_SR_READ); //Read contents of fault status register
+    uint8_t temp[2], return_int;
+    for(int i=0; i<2; i++)
+        temp[i]=fault_byte;
+    
+    //Check if any of the faults for thermocouple connection are triggered
+    if      ((fault_byte&0xB0)==0)  //means no fault is detected for cold junction thresholds
+        return_int=0;
+    else {
+        if ((fault_byte&0x80)==0) {   //check if normal operation of cold junction is true
+            if      (temp[0]&0x20) {
+                LOG("FAULT! Cold Junction temp is higher than the threshold that is set!\r\n");
+                return_int=1;
+            }
+            else if (temp[1]&0x10) {
+                LOG("FAULT! Cold Junction temp is lower than the threshold that is set!\r\n");
+                return_int=2;
+            }
+        }
+        else {                      //Cold Junction is operating outside of normal range
+            LOG("FAULT! Cold Junction temperature is out of range for specific type of thermocouple!\r\n");
+            if      (temp[0]&0x20) {
+                LOG("FAULT! Cold Junction temp is higher than the threshold that is set!\r\n");
+                return_int=4;
+            }
+            else if (temp[1]&0x10) {
+                LOG("FAULT! Cold Junction temp is lower than the threshold that is set!\r\n");
+                return_int=5;
+            }
+            else                    //no other faults are flagged besides unnatural operation
+                return_int=3;
+        }
+    }
+    return return_int;
+}
+
+//*****************************************************************************
+bool MAX31856::checkFaultsThermocoupleConnection()
+{
+    uint8_t fault_byte=registerReadByte(ADDRESS_SR_READ); //Read contents of fault status register
+    uint8_t temp[2];
+    for(int i=0; i<2; i++)
+        temp[i]=fault_byte;
+    
+    //Check if any of the faults for thermocouple connection are triggered
+    if (fault_byte==0) //means no fault is detected
+        return_val=1;
+    else{    
+        if (temp[0]&0x02) {
+            LOG("Overvotage/Undervoltage Fault triggered! Input voltage is negative or the voltage is greater than Vdd! Please check thermocouple connection!\r\n");
+            return_val=0;
+        }
+        if (temp[1]&0x01) {
+            LOG("Open circuit fault detected! Please check thermocouple connection!\r\n");
+            return_val=0;
+        }
+    }
+    return return_val;
+}
+
 
 //Register:CR0    Bits: 7
 //*****************************************************************************
@@ -319,7 +441,6 @@
 {
     if(enable)
         val=0;
-    ;
     if      (val==MASK_CJ_FAULT_THRESHOLD_HIGH) {          //Cold Junction High Threshold Fault Mask
         return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_5, val);
         LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_CJ_FAULT_THRESHOLD_HIGH\r\n");
@@ -352,91 +473,99 @@
 }
 
 
-//Register:MASK    Bits: 5:0
+////Register:MASK    Bits: 5:0
+////******************************************************************************
+//float MAX31856::setFaultThresholds(uint8_t val, bool enable_mask, float temperature) 
+//{
+//    float return_val;
+//    uint8_t temp_val;
+//    if(enable_mask) {
+//        temp_val=0;
+//    }
+//    else {
+//        temp_val=val;
+//    }
+//    if      (val==MASK_CJ_FAULT_THRESHOLD_HIGH) {          //Cold Junction High Threshold Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_5, temp_val);
+//        
+//        int8_t temperature_byte=temperature;
+//        
+//        if      (temperature_byte>CJ_MAX_VAL_FAULT)
+//            temperature_byte=CJ_MAX_VAL_FAULT;
+//        else if (temperature_byte<=0 || temperature_byte>=CJ_MIN_VAL_FAULT)            
+//            temperature_byte=twosComplimentToSigned8(temperature_byte);    //Convert the 2's compliment int into a signed value
+//        else if (temperature_byte<CJ_MIN_VAL_FAULT)
+//            temperature_byte=twosComplimentToSigned8(CJ_MIN_VAL_FAULT);    //Convert the 2's compliment int into a signed value
+//        //else the data is within range, no more manipulation of data is needed
+//        return_val=registerWriteByte(ADDRESS_CJHF_WRITE, temperature_byte);
+//    }
+//    else if (val==MASK_CJ_FAULT_THRESHOLD_LOW) {           //Cold Junction Low  Threshold Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_4, temp_val);
+//        
+//        int8_t temperature_byte=temperature;
+//        
+//        if      (temperature_byte>CJ_MAX_VAL_FAULT)
+//            temperature_byte=CJ_MAX_VAL_FAULT;
+//        else if (temperature_byte<=0 || temperature_byte>=CJ_MIN_VAL_FAULT) 
+//            temperature_byte=twosComplimentToSigned8(temperature_byte);    //Convert the 2's compliment int into a signed value
+//        else if (temperature_byte<CJ_MIN_VAL_FAULT)
+//            temperature_byte=twosComplimentToSigned8(CJ_MIN_VAL_FAULT);    //Convert the 2's compliment int into a signed value
+//        //else the data is within range, no more manipulation of data is needed
+//        
+//        return_val=registerWriteByte(ADDRESS_CJLF_WRITE, temperature_byte);
+//    }
+//    else if (val==MASK_TC_FAULT_THRESHOLD_HIGH) {          //Thermocouple High Threshold Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_3, temp_val);
+//        
+//        if (temperature) {
+//            int8_t temperature_byte[2];
+//            int16_t temperature_multi_byte =(int16_t)(temperature*4.0);
+//            if      (temperature_multi_byte>(TC_MAX_VAL_FAULT*4.0f))                     
+//                temperature_multi_byte=TC_MAX_VAL_FAULT*4.0f;
+//            else if (temperature_multi_byte<=0 || temperature_multi_byte>=(TC_MIN_VAL_FAULT*4.0f)) 
+//                temperature_multi_byte=twosComplimentToSigned16(temperature_multi_byte);    //Convert the 2's compliment int into a signed value
+//            else if (temperature_multi_byte<(TC_MIN_VAL_FAULT*4.0f))
+//                temperature_multi_byte=twosComplimentToSigned16(TC_MIN_VAL_FAULT*4.0f);    //Convert the 2's compliment int into a signed value
+//            
+//            //now split up the 32bit int into two bytes to program the registers with
+//            temperature_byte[0]=((uint8_t)((temperature_multi_byte)&(0xFF00) >> 8));
+//            temperature_byte[1]=((uint8_t)((temperature_multi_byte)&(0x00FF)));
+//            
+//            return_val=registerWriteByte(ADDRESS_LTHFTH_WRITE, temperature_byte[0]);
+//            return_val=registerWriteByte(ADDRESS_LTHFTL_WRITE, temperature_byte[1]);
+//            
+//            return_val=temperature;
+//        }
+////        else {
+////            /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////return_val="WHATEVER IS IN THE REGISTERS WHEN YOU SET THE FLAG JUST INCASE YOU NEED TO SEE WHAT IS INSISIDE THE REGISTER";
+////        }
+//    }
+//    else if (val==MASK_TC_FAULT_THRESHOLD_LOW)            //Thermocouple Low  Threshold Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_2, temp_val);
+//    else if (val==MASK_OVER_UNDER_VOLT_FAULT)             //Over-Voltage/Under-Voltage Input Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_1, temp_val);
+//    else if (val==MASK_OPEN_CIRCUIT_FAULT)                //Thermocouple Open-Circuit Fault Mask
+//        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_0, temp_val);
+//    else {
+//        LOG("Incorrect parameter selected for MASK Register. Default value not changed.\r\nPlease see MAX31856.h for list of valid parameters. \r\n"); 
+//        return_val=0; //returns a 0 to flag that the parameter wasn't programmed due to wrong parameter in function call
+//    }
+//    return return_val;
+//}
+
 //******************************************************************************
-float MAX31856::setFaultThresholds(uint8_t val, bool enable_mask, float temperature) 
+bool MAX31856::coldJunctionOffset(float temperature)
 {
-    float return_val;
-    uint8_t temp_val;
-    if(enable_mask) {
-        temp_val=0;
-    }
-    else {
-        temp_val=val;
-    }
-    if      (val==MASK_CJ_FAULT_THRESHOLD_HIGH) {          //Cold Junction High Threshold Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_5, temp_val);
-        
-        int8_t temperature_byte=temperature;
-        
-        if      (temperature_byte>CJ_MAX_VAL_FAULT)
-            temperature_byte=CJ_MAX_VAL_FAULT;
-        else if (temperature_byte<=0 || temperature_byte>=CJ_MIN_VAL_FAULT)            
-            temperature_byte=twosComplimentToSigned8(temperature_byte);    //Convert the 2's compliment int into a signed value
-        else if (temperature_byte<CJ_MIN_VAL_FAULT)
-            temperature_byte=twosComplimentToSigned8(CJ_MIN_VAL_FAULT);    //Convert the 2's compliment int into a signed value
-        //else the data is within range, no more manipulation of data is needed
-        return_val=registerWriteByte(ADDRESS_CJHF_WRITE, temperature_byte);
+    if (temperature > 7.9375 || temperature < -8.0) {
+        LOG("Input value to offest the cold junction point is non valid. enter in value in range -8 to +7.9375\r\n");
+        return_val = 0;
     }
-    else if (val==MASK_CJ_FAULT_THRESHOLD_LOW) {           //Cold Junction Low  Threshold Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_4, temp_val);
-        
-        int8_t temperature_byte=temperature;
-        
-        if      (temperature_byte>CJ_MAX_VAL_FAULT)
-            temperature_byte=CJ_MAX_VAL_FAULT;
-        else if (temperature_byte<=0 || temperature_byte>=CJ_MIN_VAL_FAULT) 
-            temperature_byte=twosComplimentToSigned8(temperature_byte);    //Convert the 2's compliment int into a signed value
-        else if (temperature_byte<CJ_MIN_VAL_FAULT)
-            temperature_byte=twosComplimentToSigned8(CJ_MIN_VAL_FAULT);    //Convert the 2's compliment int into a signed value
-        //else the data is within range, no more manipulation of data is needed
-        
-        return_val=registerWriteByte(ADDRESS_CJLF_WRITE, temperature_byte);
-    }
-    else if (val==MASK_TC_FAULT_THRESHOLD_HIGH) {          //Thermocouple High Threshold Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_3, temp_val);
-        
-        if (temperature) {
-            int8_t temperature_byte[2];
-            int16_t temperature_multi_byte =(int16_t)(temperature*4.0);
-            if      (temperature_multi_byte>(TC_MAX_VAL_FAULT*4.0f))                     
-                temperature_multi_byte=TC_MAX_VAL_FAULT*4.0f;
-            else if (temperature_multi_byte<=0 || temperature_multi_byte>=(TC_MIN_VAL_FAULT*4.0f)) 
-                temperature_multi_byte=twosComplimentToSigned16(temperature_multi_byte);    //Convert the 2's compliment int into a signed value
-            else if (temperature_multi_byte<(TC_MIN_VAL_FAULT*4.0f))
-                temperature_multi_byte=twosComplimentToSigned16(TC_MIN_VAL_FAULT*4.0f);    //Convert the 2's compliment int into a signed value
-            
-            //now split up the 32bit int into two bytes to program the registers with
-            temperature_byte[0]=((uint8_t)((temperature_multi_byte)&(0xFF00) >> 8));
-            temperature_byte[1]=((uint8_t)((temperature_multi_byte)&(0x00FF)));
-            
-            return_val=registerWriteByte(ADDRESS_LTHFTH_WRITE, temperature_byte[0]);
-            return_val=registerWriteByte(ADDRESS_LTHFTL_WRITE, temperature_byte[1]);
-            
-            return_val=temperature;
-        }
-//        else {
-//            /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////return_val="WHATEVER IS IN THE REGISTERS WHEN YOU SET THE FLAG JUST INCASE YOU NEED TO SEE WHAT IS INSISIDE THE REGISTER";
-//        }
-    }
-    else if (val==MASK_TC_FAULT_THRESHOLD_LOW)            //Thermocouple Low  Threshold Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_2, temp_val);
-    else if (val==MASK_OVER_UNDER_VOLT_FAULT)             //Over-Voltage/Under-Voltage Input Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_1, temp_val);
-    else if (val==MASK_OPEN_CIRCUIT_FAULT)                //Thermocouple Open-Circuit Fault Mask
-        return_val=registerReadWriteByte(ADDRESS_MASK_READ, ADDRESS_MASK_WRITE, MASK_CLEAR_BITS_0, temp_val);
-    else {
-        LOG("Incorrect parameter selected for MASK Register. Default value not changed.\r\nPlease see MAX31856.h for list of valid parameters. \r\n"); 
-        return_val=0; //returns a 0 to flag that the parameter wasn't programmed due to wrong parameter in function call
-    }
+    int8_t temp_val=temperature*16.0f; //normalize the value to get rid of decimal and shorten it to size of register
+    return_val=registerWriteByte(ADDRESS_CJTO_WRITE, temp_val); //write the byte to cold junction offset register
     return return_val;
 }
 
 
-
-
-
-
 //The following functions are for internal library use only
 //******************************************************************************
 void MAX31856::spiEnable() 
@@ -491,34 +620,22 @@
     return true;
 }
 
-
 //******************************************************************************
-int8_t MAX31856::twosComplimentToSigned8(int8_t temp)
+uint8_t MAX31856::registerReadByte(uint8_t read_address) 
 {
-    temp=(~(temp)+1);               //Take two's complement of the negative number
-    temp|=(int8_t)(0x80UL);                 //And convert it into 7-bit val with msb as sign bit
-    return temp;
-}
-
-//******************************************************************************
-int16_t MAX31856::twosComplimentToSigned16(int16_t temp)
-{
-    temp=(~(temp)+1);               //Take two's complement of the negative number
-    temp|=(int16_t)(0x8000UL);               //And convert it into 15-bit val with msb as sign bit
-    return temp;
+    uint8_t buf_read, buf_write=read_address;
+    spiEnable();
+    buf_read=spi.write(buf_write);
+    buf_read=spi.write(buf_write);
+    spiDisable();
+    return buf_read;
 }
 
 
-//******************************************************************************
-MAX31856::~MAX31856(void) 
-{
-  //empty block
-}
 
 
-//bool MAX31856::checkForFaults() {
-//    
-//}
+
+
 
 
 
@@ -535,23 +652,36 @@
 */
 
 
+//******************************************************************************
+void MAX31856::calculateDelayTime() {
+    uint32_t temp_int;
+    
+    if      (conversion_mode==0 || thermocouple_conversion_count==0) {
+        if (filter_mode==0)  //60Hz
+            temp_int=82+(samples-1)*33.33f;
+        else                 //50Hz
+            temp_int=98+(samples-1)*40.00f;
+    }
+    else  { 
+        if (filter_mode==0)  //60Hz
+            temp_int=82+(samples-1)*16.67f;
+        else                //50Hz
+            temp_int=98+(samples-1)*20.00f;
+    }
+    
+    if (cold_junction_enabled==0) //cold junction is disabled enabling 25 millisecond faster conversion times
+        temp_int=temp_int-25;
+    conversion_time=1000*temp_int; //set private member conversion time to calculated minimum wait time in microseconds
+    return;
+}
 
-//uint32_t MAX31856::calculateDelayTime() {
-//    uint32_t delayTime;
-//    
-//    if      (auto_convert_mode==1 && samples==1) { //single conversion
-//        if (filter_mode==0)  //60Hz
-//            delayTime=82+(samples-1)*33.33f;
-//        if (filter_mode==1)  //50Hz
-//            delayTime=98+(samples-1)*40.00f;
-//    }
-//    else if (auto_convert_mode==1 && samples>1) { //single conversion
-//        if (filter_mode==0)  //60Hz
-//            delayTime=82+(samples-1)*33.33f;
-//        if (filter_mode==1)  //50Hz
-//            delayTime=98+(samples-1)*40.00f;
-//    }
-//    
+//*****************************************************************************
+MAX31856::~MAX31856(void) 
+{
+  //empty block
+}
+
+
 //            
 //            
 //            
@@ -559,3 +689,80 @@
 //auto 60   143
 //1shot 50  98
 //1shot 60  82
+
+
+//*****************************************************************************    
+//EXTRA
+//*****************************************************************************    
+//bool MAX31856::checkFaultsAll()
+//{
+//    uint8_t temp[9];
+//    uint8_t buf_read, buf_write=ADDRESS_SR_READ;
+//    
+//    spiEnable();
+//    buf_read=spi.write(buf_write);
+//    buf_read=spi.write(buf_write);
+//    spiDisable();
+//    for(int i=0; i<9; i++)
+//        temp[i]=buf_read;
+//    
+//    //Check if any of the faults are triggered
+//    if ((temp[0]&0xFF)==0) //means no fault is detected
+//        return_val=1;
+//    else{    
+//        if (temp[0]&0x80) {
+//            LOG("Cold Junction out of range fault is triggered! ");
+//            return_val=0;
+//        }
+//        if (temp[1]&0x40) {
+//            LOG("Thermocouple  out of range fault is triggered! ");
+//            return_val=0;
+//        }
+//        if (temp[2]&0x20) {
+//            LOG("Temperature is higher than the threshold that is set!\r\n");
+//            return_val=0;
+//        }
+//        if (temp[3]&0x10) {
+//            LOG("Temperature is lower  than the threshold that is set!\r\n");
+//            return_val=0;
+//        }
+//        if (temp[4]&0x08) {
+//            LOG("Temperature is higher than the threshold that is set!\r\n");
+//            return_val=0;
+//        }
+//        if (temp[5]&0x04) {
+//            LOG("Temperature is lower  than the threshold that is set!\r\n");
+//            return_val=0;
+//        }
+//        if (temp[6]&0x02) {
+//            LOG("Overvotage/Undervoltage Fault triggered! Input voltage is negative or the voltage is greater than Vdd! Please check thermocouple connection!\r\n");
+//            return_val=0;
+//        }
+//        if (temp[7]&0x01) {
+//            LOG("Open circuit fault detected! Please check thermocouple connection!\r\n");
+//            return_val=0;
+//        }
+//    }
+//    return return_val;
+//}
+
+
+
+////******************************************************************************
+//int8_t MAX31856::twosComplimentToSigned8(int8_t temp)
+//{
+//    temp=(~(temp)+1);               //Take two's complement of the negative number
+//    temp|=(int8_t)(0x80UL);                 //And convert it into 7-bit val with msb as sign bit
+//    return temp;
+//}
+
+
+
+////******************************************************************************
+//int16_t MAX31856::twosComplimentToSigned16(int16_t temp)
+//{
+//    temp=(~(temp)+1);               //Take two's complement of the negative number
+//    temp|=(int16_t)(0x8000UL);               //And convert it into 15-bit val with msb as sign bit
+//    return temp;
+//}
+