Diff: MAX31856.cpp

Revision:

0:b714c6a7c969

Child:

1:a1bbb5c254f2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX31856.cpp	Thu Sep 14 17:56:47 2017 +0000
@@ -0,0 +1,616 @@
+#include <mbed.h>
+#include "MAX31856.h"
+
+#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);
+    setEmiFilterFreq(_fltr);
+    setNumSamplesAvg(_samples);
+    setConversionMode(_conversion_mode);
+}
+
+
+//*****************************************************************************
+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};
+    
+    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;
+        }
+    }
+    thermocouple_conversion_count++; //iterate the conversion count to speed up time in between future converions in always on mode
+    
+    checkFaultsThermocoupleThresholds();  //print any faults to the terminal
+    return 0;
+}
+
+
+//*****************************************************************************
+float MAX31856::readCJ()
+{
+    int32_t temp;
+    uint8_t buf_read[3], buf_write=ADDRESS_CJTH_READ;
+    
+    spiEnable();
+    for(int i=0; i<3; i++)
+    {
+        buf_read[i]=spi.write(buf_write);
+    }
+    spiDisable();
+    
+    //Convert the registers contents into the correct value
+    temp =((int32_t)(buf_read[1] << 6));        //Shift the MSB into place
+    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
+//*****************************************************************************
+bool MAX31856::setConversionMode(uint8_t val) 
+{
+    if      (val==CR0_CONV_MODE_NORMALLY_OFF) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_7, val);
+        conversion_mode=0;
+        LOG("Register containing\t\tsetConversionMode\t\twas programmed with the parameter\t\tCR0_CONV_MODE_NORMALLY_OFF\r\n");
+    } 
+    else if (val==CR0_CONV_MODE_NORMALLY_ON) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_7, val);
+        conversion_mode=1;
+        LOG("Register containing\t\tsetConversionMode\t\twas programmed with the parameter\t\tCR0_CONV_MODE_NORMALLY_ON\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 7. 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;
+}
+
+
+//Register:CR0    Bits: 6
+//*****************************************************************************
+bool MAX31856::setOneShotMode(uint8_t val) 
+{
+    if      (val==CR0_1_SHOT_MODE_NO_CONVERSION) 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_6, val);
+    else if (val==CR0_1_SHOT_MODE_ONE_CONVERSION)
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_6, val);
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 6. 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;
+}
+
+
+//Register:CR0    Bits: 5:4
+//*****************************************************************************
+bool MAX31856::setOpenCircuitFaultDetection(uint8_t val) 
+{
+    if      (val==CR0_OC_DETECT_DISABLED) { 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_5_4, val);
+        LOG("Register containing\t\tsetOpenCircuitFaultDetection\t\twas programmed with the parameter\t\tCR0_OC_DETECT_DISABLED\r\n");
+    }
+    else if (val==CR0_OC_DETECT_ENABLED_R_LESS_5k) {  
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_5_4, val);
+        LOG("Register containing\t\tsetOpenCircuitFaultDetection\t\twas programmed with the parameter\t\tCR0_OC_DETECT_ENABLED_R_LESS_5k\r\n");
+    }
+    else if (val==CR0_OC_DETECT_ENABLED_TC_LESS_2ms) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_5_4, val);
+        LOG("Register containing\t\tsetOpenCircuitFaultDetection\t\twas programmed with the parameter\t\tCR0_OC_DETECT_ENABLED_TC_LESS_2ms\r\n");
+    }
+    else if (val==CR0_OC_DETECT_ENABLED_TC_MORE_2ms) { 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_5_4, val);
+        LOG("Register containing\t\tsetOpenCircuitFaultDetection\t\twas programmed with the parameter\t\tCR0_OC_DETECT_ENABLED_TC_MORE_2ms\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bits 5:4. 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;
+}
+
+
+//Register:CR0    Bits: 3
+//*****************************************************************************
+bool MAX31856::setColdJunctionDisable(uint8_t val) 
+{
+    if (val==CR0_COLD_JUNC_ENABLE) { 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_3, val);
+        cold_junction_enabled=1;
+        LOG("Register containing\t\tsetColdJunctionDisable\t\twas programmed with the parameter\t\tCR0_COLD_JUNC_ENABLE\r\n");
+    }
+    else if (val==CR0_COLD_JUNC_DISABLE) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_3, val);
+        cold_junction_enabled=0;
+        LOG("Register containing\t\tsetColdJunctionDisable\t\twas programmed with the parameter\t\tCR0_COLD_JUNC_DISABLE\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 3. 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;
+}
+
+
+//Register:CR0    Bits: 2
+//*****************************************************************************
+bool MAX31856::setFaultMode(uint8_t val) 
+{
+    if      (val==CR0_FAULT_MODE_COMPARATOR) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_2, val);
+        LOG("Register containing\t\tsetFaultMode\t\twas programmed with the parameter\t\tCR0_FAULT_MODE_COMPARATOR\r\n");
+    }
+    else if (val==CR0_FAULT_MODE_INTERUPT) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_2, val);
+        LOG("Register containing\t\tsetFaultMode\t\twas programmed with the parameter\t\tCR0_FAULT_MODE_INTERUPT\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 2. 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;
+}
+
+
+//Register:CR0    Bits: 1
+//*****************************************************************************
+bool MAX31856::setFaultStatusClear(uint8_t val) 
+{
+    if      (val==CR0_FAULTCLR_DEFAULT_VAL) { 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_1, val);
+        LOG("Register containing\t\tsetFaultStatusClear\t\twas programmed with the parameter\t\tCR0_FAULTCLR_DEFAULT_VAL\r\n");
+    }
+    else if (val==CR0_FAULTCLR_RETURN_FAULTS_TO_ZERO) { 
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_1, val);
+        LOG("Register containing\t\tsetFaultStatusClear\t\twas programmed with the parameter\t\tCR0_FAULTCLR_RETURN_FAULTS_TO_ZERO\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 1. 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;
+}
+
+
+//Register:CR0    Bits: 0
+//*****************************************************************************
+bool MAX31856::setEmiFilterFreq(uint8_t val) 
+{
+    if      (val==CR0_FILTER_OUT_60Hz) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_0, val);
+        filter_mode=0;
+        LOG("Register containing\t\tsetEmiFilterFreq\t\twas programmed with the parameter\t\tCR0_FILTER_OUT_60Hz\r\n");
+    }
+    else if (val==CR0_FILTER_OUT_50Hz) {
+        return_val=registerReadWriteByte(ADDRESS_CR0_READ, ADDRESS_CR0_WRITE, CR0_CLEAR_BITS_0, val);
+        filter_mode=1;
+        LOG("Register containing\t\tsetEmiFilterFreq\t\twas programmed with the parameter\t\tCR0_FILTER_OUT_50Hz\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 0 (CR0) bit 0. 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;
+}
+
+
+//Register:CR1    Bits: 6:4
+//*****************************************************************************
+bool MAX31856::setNumSamplesAvg(uint8_t val) 
+{   
+    if      (val==CR1_AVG_TC_SAMPLES_1) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_6_4, val);
+        samples=1;
+        LOG("Register containing\t\tsetNumSamplesAvg\t\twas programmed with the parameter\t\tCR1_AVG_TC_SAMPLES_1\r\n");
+    }
+    else if (val==CR1_AVG_TC_SAMPLES_2) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_6_4, val);
+        samples=2;
+        LOG("Register containing\t\tsetNumSamplesAvg\t\twas programmed with the parameter\t\tCR1_AVG_TC_SAMPLES_2\r\n");
+    }
+    else if (val==CR1_AVG_TC_SAMPLES_4) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_6_4, val);
+        samples=4;
+        LOG("Register containing\t\tsetNumSamplesAvg\t\twas programmed with the parameter\t\tCR1_AVG_TC_SAMPLES_4\r\n");
+    }
+    else if (val==CR1_AVG_TC_SAMPLES_8) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_6_4, val);
+        samples=8;
+        LOG("Register containing\t\tsetNumSamplesAvg\t\twas programmed with the parameter\t\tCR1_AVG_TC_SAMPLES_8\r\n");
+    }
+    else if (val==CR1_AVG_TC_SAMPLES_16) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_6_4, val);
+        samples=16;
+        LOG("Register containing\t\tsetNumSamplesAvg\t\twas programmed with the parameter\t\tCR1_AVG_TC_SAMPLES_16\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 1 (CR1) bits 6:4. 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;
+}
+
+
+//Register:CR1    Bits: 3:0
+//*****************************************************************************
+bool MAX31856::setThermocoupleType(uint8_t val) 
+{   
+    if      (val==CR1_TC_TYPE_B) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_B\r\n");
+    }
+    else if (val==CR1_TC_TYPE_E) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_E\r\n");
+    }
+    else if (val==CR1_TC_TYPE_J) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_J\r\n");
+    }
+    else if (val==CR1_TC_TYPE_K) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_K\r\n");
+    }
+    else if (val==CR1_TC_TYPE_N) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_N\r\n");
+    }
+    else if (val==CR1_TC_TYPE_R) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_R\r\n");
+    }
+    else if (val==CR1_TC_TYPE_S) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_S\r\n");
+    }
+    else if (val==CR1_TC_TYPE_T) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=false;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_T\r\n");
+    }
+    else if (val==CR1_TC_TYPE_VOLT_MODE_GAIN_8) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=true;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_VOLT_MODE_GAIN_8\r\n");
+    }
+    else if (val==CR1_TC_TYPE_VOLT_MODE_GAIN_32) {
+        return_val=registerReadWriteByte(ADDRESS_CR1_READ, ADDRESS_CR1_WRITE, CR1_CLEAR_BITS_3_0, val);
+        voltage_mode=true;
+        LOG("Register containing\t\tsetThermocoupleType\t\twas programmed with the parameter\t\tCR1_TC_TYPE_VOLT_MODE_GAIN_32\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Control Register 1 (CR1) bits 3:0. 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;
+}
+
+
+//Register:MASK    Bits: 5:0
+//*****************************************************************************
+bool MAX31856::setFaultMasks(uint8_t val, bool enable) 
+{
+    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");
+    }
+    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, val);
+        LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_CJ_FAULT_THRESHOLD_LOW\r\n");
+    }
+    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, val);
+        LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_TC_FAULT_THRESHOLD_HIGH\r\n");
+    }
+    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, val);
+        LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_TC_FAULT_THRESHOLD_LOW\r\n");
+    }
+    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, val);
+        LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_OVER_UNDER_VOLT_FAULT\r\n");
+    }
+    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, val);
+        LOG("Register containing\t\tsetFaultMasks\t\twas programmed with the parameter\t\tMASK_OPEN_CIRCUIT_FAULT\r\n");
+    }
+    else {
+        LOG("Incorrect parameter selected for Mask Register bits 5:0. 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;
+}
+
+
+//Register:MASK    Bits: 5:0
+//******************************************************************************
+bool MAX31856::setFaultThresholds(uint8_t val, float temperature) 
+{
+    if      (val==MASK_CJ_FAULT_THRESHOLD_HIGH) {          //Cold Junction High Threshold Fault Mask
+        int8_t temperature_byte=temperature;
+        return_val=registerWriteByte(ADDRESS_CJHF_WRITE, temperature_byte);
+    }
+    else if (val==MASK_CJ_FAULT_THRESHOLD_LOW) {           //Cold Junction Low  Threshold Fault Mask
+        int8_t temperature_byte=temperature;
+        return_val=registerWriteByte(ADDRESS_CJLF_WRITE, temperature_byte);
+    }
+    else if (val==MASK_TC_FAULT_THRESHOLD_HIGH) {          //Thermocouple High Threshold Fault Mask
+        int8_t temperature_byte[2];
+        int16_t temperature_multi_byte =temperature*4.0;
+        //now split up the 16bit 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]);
+    }
+    else if (val==MASK_TC_FAULT_THRESHOLD_LOW) {          //Thermocouple LOW Threshold Fault Mask
+        int8_t temperature_byte[2];
+        int16_t temperature_multi_byte =temperature*4.0;
+        //now split up the 16bit 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]);
+    }
+    else 
+        LOG("Please select correct threshold register to program with the correct value!\r\n");
+    return return_val;
+}
+
+//******************************************************************************
+bool MAX31856::coldJunctionOffset(float temperature)
+{
+    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;
+    }
+    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() 
+{
+    ncs=0; //Set CS low to start transmission (interrupts conversion)
+    return;
+}
+
+
+//******************************************************************************
+void MAX31856::spiDisable() 
+{
+    ncs=1; //Set CS high to stop transmission (restarts conversion)
+    return;
+}
+
+
+//******************************************************************************
+bool MAX31856::registerReadWriteByte(uint8_t read_address, uint8_t write_address, int clear_bits, uint8_t val) 
+{   
+    uint8_t buf_read[2];
+    
+    //Read the current contents of a register
+    spiEnable();
+    for(int i=0; i<2; i++) {
+        buf_read[i]=spi.write(read_address);
+    }
+    spiDisable();
+    
+    //Modify contents pulled from the register 
+    buf_read[1]&=clear_bits;    //Clear the contents of bits of parameter you are trying to clear for later or equal operation
+    buf_read[1]|=val;       //Bitwise OR the input parameter with cleaned buf_read[1] to create new byte
+    val=buf_read[1];
+    
+    //Write the updated byte to the register 
+    spiEnable();
+    buf_read[0]=spi.write(write_address);
+    buf_read[1]=spi.write(val);
+    spiDisable();
+    return 1;
+}
+
+
+//******************************************************************************
+bool MAX31856::registerWriteByte(uint8_t write_address, uint8_t val) 
+{   
+    //Write the updated byte to the register 
+    spiEnable();
+    spi.write(write_address);
+    spi.write(val);
+    spiDisable();
+    return true;
+}
+
+//******************************************************************************
+uint8_t MAX31856::registerReadByte(uint8_t read_address) 
+{
+    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;
+}
+
+//******************************************************************************
+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;
+}
+
+//*****************************************************************************
+MAX31856::~MAX31856(void) 
+{
+  //empty block
+}
+