Maxim Integrated / MAX31856

Library for the MAX31856 Precision Thermocouple to Digital Converter with Linearization

Dependents:   MAX31856_example_program

Fork of MAX31856 by Central Applications - Mbed Code repo

MAX31856.h@1:a1bbb5c254f2, 2017-09-14 (annotated)

Committer:
DevinAlexander
Date:
Thu Sep 14 18:08:20 2017 +0000
Revision:
1:a1bbb5c254f2
Parent:
0:b714c6a7c969 
Final first revision

Who changed what in which revision?

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DevinAlexander 1:a1bbb5c254f2 1 /******************************************************************//**
DevinAlexander 1:a1bbb5c254f2 2 * @file MAX31856.h
DevinAlexander 1:a1bbb5c254f2 3 *
DevinAlexander 1:a1bbb5c254f2 4 * @author Devin Alexander
DevinAlexander 1:a1bbb5c254f2 5 *
DevinAlexander 1:a1bbb5c254f2 6 * @version 1.0
DevinAlexander 1:a1bbb5c254f2 7 *
DevinAlexander 1:a1bbb5c254f2 8 * Started: SEPTEMBER 14th 2017
DevinAlexander 1:a1bbb5c254f2 9 *
DevinAlexander 1:a1bbb5c254f2 10 * Updated:
DevinAlexander 1:a1bbb5c254f2 11 *
DevinAlexander 1:a1bbb5c254f2 12 * @brief Header file for MAX31856 class
DevinAlexander 1:a1bbb5c254f2 13 *
DevinAlexander 1:a1bbb5c254f2 14 ***********************************************************************
DevinAlexander 1:a1bbb5c254f2 15 *
DevinAlexander 1:a1bbb5c254f2 16 * @copyright
DevinAlexander 1:a1bbb5c254f2 17 * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
DevinAlexander 1:a1bbb5c254f2 18 *
DevinAlexander 1:a1bbb5c254f2 19 * Permission is hereby granted, free of charge, to any person obtaining a
DevinAlexander 1:a1bbb5c254f2 20 * copy of this software and associated documentation files (the "Software"),
DevinAlexander 1:a1bbb5c254f2 21 * to deal in the Software without restriction, including without limitation
DevinAlexander 1:a1bbb5c254f2 22 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
DevinAlexander 1:a1bbb5c254f2 23 * and/or sell copies of the Software, and to permit persons to whom the
DevinAlexander 1:a1bbb5c254f2 24 * Software is furnished to do so, subject to the following conditions:
DevinAlexander 1:a1bbb5c254f2 25 *
DevinAlexander 1:a1bbb5c254f2 26 * The above copyright notice and this permission notice shall be included
DevinAlexander 1:a1bbb5c254f2 27 * in all copies or substantial portions of the Software.
DevinAlexander 1:a1bbb5c254f2 28 *
DevinAlexander 1:a1bbb5c254f2 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
DevinAlexander 1:a1bbb5c254f2 30 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
DevinAlexander 1:a1bbb5c254f2 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
DevinAlexander 1:a1bbb5c254f2 32 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
DevinAlexander 1:a1bbb5c254f2 33 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
DevinAlexander 1:a1bbb5c254f2 34 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
DevinAlexander 1:a1bbb5c254f2 35 * OTHER DEALINGS IN THE SOFTWARE.
DevinAlexander 1:a1bbb5c254f2 36 *
DevinAlexander 1:a1bbb5c254f2 37 * Except as contained in this notice, the name of Maxim Integrated
DevinAlexander 1:a1bbb5c254f2 38 * Products, Inc. shall not be used except as stated in the Maxim Integrated
DevinAlexander 1:a1bbb5c254f2 39 * Products, Inc. Branding Policy.
DevinAlexander 1:a1bbb5c254f2 40 *
DevinAlexander 1:a1bbb5c254f2 41 * The mere transfer of this software does not imply any licenses
DevinAlexander 1:a1bbb5c254f2 42 * of trade secrets, proprietary technology, copyrights, patents,
DevinAlexander 1:a1bbb5c254f2 43 * trademarks, maskwork rights, or any other form of intellectual
DevinAlexander 1:a1bbb5c254f2 44 * property whatsoever. Maxim Integrated Products, Inc. retains all
DevinAlexander 1:a1bbb5c254f2 45 * ownership rights.
DevinAlexander 1:a1bbb5c254f2 46 **********************************************************************/
DevinAlexander 1:a1bbb5c254f2 47
DevinAlexander 1:a1bbb5c254f2 48
DevinAlexander 0:b714c6a7c969 49 #ifndef MAX31856_h
DevinAlexander 0:b714c6a7c969 50 #define MAX31856_h
DevinAlexander 0:b714c6a7c969 51 #include "mbed.h"
DevinAlexander 0:b714c6a7c969 52
DevinAlexander 0:b714c6a7c969 53 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 54 //Define all the addresses of the registers in the MAX31856
DevinAlexander 0:b714c6a7c969 55 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 56 #define ADDRESS_CR0_READ 0x00 //Factory Default 00h
DevinAlexander 0:b714c6a7c969 57 #define ADDRESS_CR0_WRITE 0x80
DevinAlexander 0:b714c6a7c969 58 #define ADDRESS_CR1_READ 0x01 //Factory Default 03h
DevinAlexander 0:b714c6a7c969 59 #define ADDRESS_CR1_WRITE 0x81
DevinAlexander 0:b714c6a7c969 60 #define ADDRESS_MASK_READ 0x02 //Factory Default FFh
DevinAlexander 0:b714c6a7c969 61 #define ADDRESS_MASK_WRITE 0x82
DevinAlexander 0:b714c6a7c969 62 #define ADDRESS_CJHF_READ 0x03 //Factory Default 7Fh
DevinAlexander 0:b714c6a7c969 63 #define ADDRESS_CJHF_WRITE 0x83
DevinAlexander 0:b714c6a7c969 64 #define ADDRESS_CJLF_READ 0x04 //Factory Default C0h
DevinAlexander 0:b714c6a7c969 65 #define ADDRESS_CJLF_WRITE 0x84
DevinAlexander 0:b714c6a7c969 66 #define ADDRESS_LTHFTH_READ 0x05 //Factory Default 7Fh
DevinAlexander 0:b714c6a7c969 67 #define ADDRESS_LTHFTH_WRITE 0x85
DevinAlexander 0:b714c6a7c969 68 #define ADDRESS_LTHFTL_READ 0x06 //Factory Default FFh
DevinAlexander 0:b714c6a7c969 69 #define ADDRESS_LTHFTL_WRITE 0x86
DevinAlexander 0:b714c6a7c969 70 #define ADDRESS_LTLFTH_READ 0x07 //Factory Default 80h
DevinAlexander 0:b714c6a7c969 71 #define ADDRESS_LTLFTH_WRITE 0x87
DevinAlexander 0:b714c6a7c969 72 #define ADDRESS_LTLFTL_READ 0x08 //Factory Default 00h
DevinAlexander 0:b714c6a7c969 73 #define ADDRESS_LTLFTL_WRITE 0x88
DevinAlexander 0:b714c6a7c969 74 #define ADDRESS_CJTO_READ 0x09 //Factory Default 00h
DevinAlexander 0:b714c6a7c969 75 #define ADDRESS_CJTO_WRITE 0x89
DevinAlexander 0:b714c6a7c969 76 #define ADDRESS_CJTH_READ 0x0A //Factory Default 00h
DevinAlexander 0:b714c6a7c969 77 #define ADDRESS_CJTH_WRITE 0x8A
DevinAlexander 0:b714c6a7c969 78 #define ADDRESS_CJTL_READ 0x0B //Factory Default 00h
DevinAlexander 0:b714c6a7c969 79 #define ADDRESS_CJTL_WRITE 0x8B
DevinAlexander 0:b714c6a7c969 80 #define ADDRESS_LTCBH_READ 0x0C
DevinAlexander 0:b714c6a7c969 81 #define ADDRESS_LTCBM_READ 0x0D
DevinAlexander 0:b714c6a7c969 82 #define ADDRESS_LTCBL_READ 0x0E
DevinAlexander 0:b714c6a7c969 83 #define ADDRESS_SR_READ 0x0F
DevinAlexander 0:b714c6a7c969 84
DevinAlexander 0:b714c6a7c969 85 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 86 //Define parameters for control register zero (CR0)
DevinAlexander 0:b714c6a7c969 87 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 88 #define CR0_CONV_MODE_NORMALLY_OFF 0x00 //Power On Default value
DevinAlexander 0:b714c6a7c969 89 #define CR0_CONV_MODE_NORMALLY_ON 0x80
DevinAlexander 0:b714c6a7c969 90
DevinAlexander 0:b714c6a7c969 91 #define CR0_1_SHOT_MODE_NO_CONVERSION 0x00 //defaults to this value
DevinAlexander 0:b714c6a7c969 92 #define CR0_1_SHOT_MODE_ONE_CONVERSION 0x40 //^
DevinAlexander 0:b714c6a7c969 93
DevinAlexander 0:b714c6a7c969 94 #define CR0_OC_DETECT_DISABLED 0x00
DevinAlexander 0:b714c6a7c969 95 #define CR0_OC_DETECT_ENABLED_R_LESS_5k 0x10
DevinAlexander 0:b714c6a7c969 96 #define CR0_OC_DETECT_ENABLED_TC_LESS_2ms 0x20
DevinAlexander 0:b714c6a7c969 97 #define CR0_OC_DETECT_ENABLED_TC_MORE_2ms 0x30
DevinAlexander 0:b714c6a7c969 98
DevinAlexander 0:b714c6a7c969 99 #define CR0_COLD_JUNC_ENABLE 0x00 //Power On Default value
DevinAlexander 0:b714c6a7c969 100 #define CR0_COLD_JUNC_DISABLE 0x08 //speed of conversion is sped up by 25ms when this optionis selected (Disable the cold junc)
DevinAlexander 0:b714c6a7c969 101
DevinAlexander 0:b714c6a7c969 102 #define CR0_FAULT_MODE_COMPARATOR 0x00 //Power On Default value
DevinAlexander 0:b714c6a7c969 103 #define CR0_FAULT_MODE_INTERUPT 0x04
DevinAlexander 0:b714c6a7c969 104
DevinAlexander 0:b714c6a7c969 105 #define CR0_FAULTCLR_DEFAULT_VAL 0x00 //defaults to this value
DevinAlexander 0:b714c6a7c969 106 #define CR0_FAULTCLR_RETURN_FAULTS_TO_ZERO 0x02 //^
DevinAlexander 0:b714c6a7c969 107
DevinAlexander 0:b714c6a7c969 108 #define CR0_FILTER_OUT_60Hz 0x00 //Preset value
DevinAlexander 0:b714c6a7c969 109 #define CR0_FILTER_OUT_50Hz 0x01 //^
DevinAlexander 0:b714c6a7c969 110
DevinAlexander 0:b714c6a7c969 111
DevinAlexander 0:b714c6a7c969 112 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 113 //Define parameters for control register one (CR1)
DevinAlexander 0:b714c6a7c969 114 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 115 #define CR1_AVG_TC_SAMPLES_1 0x00 //Power on default value
DevinAlexander 0:b714c6a7c969 116 #define CR1_AVG_TC_SAMPLES_2 0x10
DevinAlexander 0:b714c6a7c969 117 #define CR1_AVG_TC_SAMPLES_4 0x20
DevinAlexander 0:b714c6a7c969 118 #define CR1_AVG_TC_SAMPLES_8 0x30
DevinAlexander 0:b714c6a7c969 119 #define CR1_AVG_TC_SAMPLES_16 0x40
DevinAlexander 0:b714c6a7c969 120
DevinAlexander 0:b714c6a7c969 121 // Define which type of thermocouple the MAX31856 is using. This is for lineariztion purposes
DevinAlexander 0:b714c6a7c969 122 #define CR1_TC_TYPE_B 0x00
DevinAlexander 0:b714c6a7c969 123 #define CR1_TC_TYPE_E 0x01
DevinAlexander 0:b714c6a7c969 124 #define CR1_TC_TYPE_J 0x02
DevinAlexander 0:b714c6a7c969 125 #define CR1_TC_TYPE_K 0x03 //Power on default value
DevinAlexander 0:b714c6a7c969 126 #define CR1_TC_TYPE_N 0x04
DevinAlexander 0:b714c6a7c969 127 #define CR1_TC_TYPE_R 0x05
DevinAlexander 0:b714c6a7c969 128 #define CR1_TC_TYPE_S 0x06
DevinAlexander 0:b714c6a7c969 129 #define CR1_TC_TYPE_T 0x07
DevinAlexander 0:b714c6a7c969 130 #define CR1_TC_TYPE_VOLT_MODE_GAIN_8 0x08
DevinAlexander 0:b714c6a7c969 131 #define CR1_TC_TYPE_VOLT_MODE_GAIN_32 0x0C
DevinAlexander 0:b714c6a7c969 132
DevinAlexander 0:b714c6a7c969 133 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 134 //Define parameters for the mask register (MASK)
DevinAlexander 0:b714c6a7c969 135 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 136 #define MASK_CJ_FAULT_THRESHOLD_HIGH 0x20
DevinAlexander 0:b714c6a7c969 137 #define MASK_CJ_FAULT_THRESHOLD_LOW 0x10
DevinAlexander 0:b714c6a7c969 138 #define MASK_TC_FAULT_THRESHOLD_HIGH 0x08
DevinAlexander 0:b714c6a7c969 139 #define MASK_TC_FAULT_THRESHOLD_LOW 0x04
DevinAlexander 0:b714c6a7c969 140 #define MASK_OVER_UNDER_VOLT_FAULT 0x02
DevinAlexander 0:b714c6a7c969 141 #define MASK_OPEN_CIRCUIT_FAULT 0x01
DevinAlexander 0:b714c6a7c969 142
DevinAlexander 0:b714c6a7c969 143 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 144 //If these defined values are &= (bitwise ANDed) with the contents of a register, it will reset the bits pertaing to the specific bitfields to zero
DevinAlexander 0:b714c6a7c969 145 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 146 #define CR0_CLEAR_BITS_7 ~(0x80)
DevinAlexander 0:b714c6a7c969 147 #define CR0_CLEAR_BITS_6 ~(0x40)
DevinAlexander 0:b714c6a7c969 148 #define CR0_CLEAR_BITS_5_4 ~(0x30)
DevinAlexander 0:b714c6a7c969 149 #define CR0_CLEAR_BITS_3 ~(0x08)
DevinAlexander 0:b714c6a7c969 150 #define CR0_CLEAR_BITS_2 ~(0x04)
DevinAlexander 0:b714c6a7c969 151 #define CR0_CLEAR_BITS_1 ~(0x02)
DevinAlexander 0:b714c6a7c969 152 #define CR0_CLEAR_BITS_0 ~(0x01)
DevinAlexander 0:b714c6a7c969 153
DevinAlexander 0:b714c6a7c969 154 #define CR1_CLEAR_BITS_6_4 ~(0x70)
DevinAlexander 0:b714c6a7c969 155 #define CR1_CLEAR_BITS_3_0 ~(0x0F)
DevinAlexander 0:b714c6a7c969 156
DevinAlexander 0:b714c6a7c969 157 #define MASK_CLEAR_BITS_5 ~(0x20)
DevinAlexander 0:b714c6a7c969 158 #define MASK_CLEAR_BITS_4 ~(0x10)
DevinAlexander 0:b714c6a7c969 159 #define MASK_CLEAR_BITS_3 ~(0x08)
DevinAlexander 0:b714c6a7c969 160 #define MASK_CLEAR_BITS_2 ~(0x04)
DevinAlexander 0:b714c6a7c969 161 #define MASK_CLEAR_BITS_1 ~(0x02)
DevinAlexander 0:b714c6a7c969 162 #define MASK_CLEAR_BITS_0 ~(0x01)
DevinAlexander 0:b714c6a7c969 163
DevinAlexander 0:b714c6a7c969 164 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 165 ///Parameters that are used throughout the library
DevinAlexander 0:b714c6a7c969 166 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 167 #define TC_MAX_VAL_FAULT 1800
DevinAlexander 0:b714c6a7c969 168 #define TC_MIN_VAL_FAULT -210
DevinAlexander 0:b714c6a7c969 169 #define CJ_MAX_VAL_FAULT 125
DevinAlexander 0:b714c6a7c969 170 #define CJ_MIN_VAL_FAULT -55
DevinAlexander 0:b714c6a7c969 171
DevinAlexander 0:b714c6a7c969 172
DevinAlexander 0:b714c6a7c969 173
DevinAlexander 0:b714c6a7c969 174 /**
DevinAlexander 0:b714c6a7c969 175 * @brief Library for the MAX31856\n
DevinAlexander 0:b714c6a7c969 176 * The MAX31856 thermocouple temperature sensor accurately measures temperature
DevinAlexander 0:b714c6a7c969 177 * and provides a vast amount of features such as:
DevinAlexander 0:b714c6a7c969 178 * //FEATURE
DevinAlexander 0:b714c6a7c969 179 * //FEATURE
DevinAlexander 0:b714c6a7c969 180 * //FEATURE
DevinAlexander 0:b714c6a7c969 181 * //FEATURE
DevinAlexander 0:b714c6a7c969 182 * //FEATURE
DevinAlexander 0:b714c6a7c969 183 * //FEATURE
DevinAlexander 0:b714c6a7c969 184 * Communication is through an SPI-compatible interface.
DevinAlexander 0:b714c6a7c969 185 *
DevinAlexander 0:b714c6a7c969 186 * @code
DevinAlexander 0:b714c6a7c969 187 * #include "mbed.h"
DevinAlexander 0:b714c6a7c969 188 * #include "MAX31856.h"
DevinAlexander 0:b714c6a7c969 189 *
DevinAlexander 0:b714c6a7c969 190 *
DevinAlexander 0:b714c6a7c969 191 * // Hardware serial port
DevinAlexander 0:b714c6a7c969 192 * Serial serial(USBTX, USBRX);
DevinAlexander 0:b714c6a7c969 193 *
DevinAlexander 0:b714c6a7c969 194 * //SPI communications
DevinAlexander 0:b714c6a7c969 195 * SPI spi(SPIO MOSI,SPIO MISO,SPIO SCK);
DevinAlexander 0:b714c6a7c969 196 *
DevinAlexander 0:b714c6a7c969 197 * //Thermocouples
DevinAlexander 0:b714c6a7c969 198 * MAX31856 Thermocouple1(spi, CHIPSELECT);
DevinAlexander 0:b714c6a7c969 199 *
DevinAlexander 0:b714c6a7c969 200 *
DevinAlexander 0:b714c6a7c969 201 * int main(void)
DevinAlexander 0:b714c6a7c969 202 * {
DevinAlexander 0:b714c6a7c969 203 * float temperature_TC_1, temperature_CJ_1;
DevinAlexander 0:b714c6a7c969 204 * while(true)
DevinAlexander 0:b714c6a7c969 205 * {
DevinAlexander 0:b714c6a7c969 206 * temperature_TC_1=Thermocouple1.readTC();
DevinAlexander 0:b714c6a7c969 207 * temperature_CJ_1=Thermocouple1.readCJ();
DevinAlexander 0:b714c6a7c969 208 * serial.printf("MAX31856 TC = %f Celsius MAX31856 CJ = %f Celsius \n\r",temperature_TC_1,temperature_CJ_1);
DevinAlexander 0:b714c6a7c969 209 * wait(1.0);
DevinAlexander 0:b714c6a7c969 210 * }
DevinAlexander 0:b714c6a7c969 211 * }
DevinAlexander 0:b714c6a7c969 212 * @endcode
DevinAlexander 0:b714c6a7c969 213 */
DevinAlexander 0:b714c6a7c969 214
DevinAlexander 0:b714c6a7c969 215
DevinAlexander 0:b714c6a7c969 216
DevinAlexander 0:b714c6a7c969 217 /** Please see pages 18-26 in the MAX31856 data sheet to see what register bit masks are needed to be set
DevinAlexander 0:b714c6a7c969 218 to achieve functionality desired. The data sheet can be found at
DevinAlexander 0:b714c6a7c969 219
DevinAlexander 0:b714c6a7c969 220 *** https://datasheets.maximintegrated.com/en/ds/MAX31856.pdf ***
DevinAlexander 0:b714c6a7c969 221 */
DevinAlexander 0:b714c6a7c969 222
DevinAlexander 0:b714c6a7c969 223
DevinAlexander 0:b714c6a7c969 224 /**
DevinAlexander 0:b714c6a7c969 225 * MAX31856 Class
DevinAlexander 0:b714c6a7c969 226 */
DevinAlexander 0:b714c6a7c969 227 class MAX31856
DevinAlexander 0:b714c6a7c969 228 {
DevinAlexander 0:b714c6a7c969 229
DevinAlexander 0:b714c6a7c969 230 public:
DevinAlexander 0:b714c6a7c969 231 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 232 //Constructor and Destructor for the class
DevinAlexander 0:b714c6a7c969 233 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 234 /**
DevinAlexander 0:b714c6a7c969 235 * @brief Constructor to create MAX31856 object with SPI information as well as preconfiguration parameter settings in configuration registers Zero and One
DevinAlexander 0:b714c6a7c969 236 * @param _spi - Reference to SPI object
DevinAlexander 0:b714c6a7c969 237 * @param _ncs - Chip Select for SPI comunications with the oject
DevinAlexander 0:b714c6a7c969 238 * @param _type - Type of thermocouple used
DevinAlexander 0:b714c6a7c969 239 * @param _fltr - Feature of the MAX31856 to filter out either 50Hz/60Hz from signal
DevinAlexander 0:b714c6a7c969 240 * @param _samples - How many samples are averaged for one conversion
DevinAlexander 0:b714c6a7c969 241 * @param _conversion_mode - Choose between always on and making conversions and off in between requests for a reading
DevinAlexander 0:b714c6a7c969 242 */
DevinAlexander 0:b714c6a7c969 243 MAX31856(SPI& _spi, PinName _ncs, uint8_t _type=CR1_TC_TYPE_K, uint8_t _fltr=CR0_FILTER_OUT_60Hz, uint8_t _samples=CR1_AVG_TC_SAMPLES_1, uint8_t _conversion_mode=CR0_CONV_MODE_NORMALLY_OFF);
DevinAlexander 0:b714c6a7c969 244
DevinAlexander 0:b714c6a7c969 245
DevinAlexander 0:b714c6a7c969 246 /** @brief Destructor */
DevinAlexander 0:b714c6a7c969 247 ~MAX31856(void);
DevinAlexander 0:b714c6a7c969 248
DevinAlexander 0:b714c6a7c969 249
DevinAlexander 0:b714c6a7c969 250 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 251 //Temperature Functions
DevinAlexander 0:b714c6a7c969 252 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 253 /**
DevinAlexander 0:b714c6a7c969 254 * @brief Requests read of the thermocouple temperature
DevinAlexander 0:b714c6a7c969 255 * @return float of the converted thermocouple reading based on current configurations
DevinAlexander 0:b714c6a7c969 256 */
DevinAlexander 0:b714c6a7c969 257 float readTC();
DevinAlexander 0:b714c6a7c969 258
DevinAlexander 0:b714c6a7c969 259
DevinAlexander 0:b714c6a7c969 260 /**
DevinAlexander 0:b714c6a7c969 261 * @brief Requests read of the cold junction temperature
DevinAlexander 0:b714c6a7c969 262 * @return float of the converted artificial cold junction reading based on current configurations
DevinAlexander 0:b714c6a7c969 263 */
DevinAlexander 0:b714c6a7c969 264 float readCJ();
DevinAlexander 0:b714c6a7c969 265
DevinAlexander 0:b714c6a7c969 266
DevinAlexander 0:b714c6a7c969 267 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 268 //Functions for register CR0
DevinAlexander 0:b714c6a7c969 269 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 270 /**
DevinAlexander 0:b714c6a7c969 271 * @brief Sets bits in the configuration register zero for setting the rate of conversions
DevinAlexander 0:b714c6a7c969 272 * @param val \li CR0_CONV_MODE_NORMALLY_OFF (Power On Default value)
DevinAlexander 0:b714c6a7c969 273 * \li CR0_CONV_MODE_NORMALLY_ON
DevinAlexander 0:b714c6a7c969 274 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 275 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 276 */
DevinAlexander 0:b714c6a7c969 277 bool setConversionMode(uint8_t val);
DevinAlexander 0:b714c6a7c969 278
DevinAlexander 0:b714c6a7c969 279
DevinAlexander 0:b714c6a7c969 280 /**
DevinAlexander 0:b714c6a7c969 281 * @brief Sets bits in the configuration register zero for enabling one conversion to take place
DevinAlexander 0:b714c6a7c969 282 * @param val \li CR0_1_SHOT_MODE_NO_CONVERSION (Power On Default value)
DevinAlexander 0:b714c6a7c969 283 * \li CR0_1_SHOT_MODE_ONE_CONVERSION (This bit self clears itself to default back to CR0_1_SHOT_MODE_NO_CONVERSION after singular conversion takes place)
DevinAlexander 0:b714c6a7c969 284 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 285 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 286 */
DevinAlexander 0:b714c6a7c969 287 bool setOneShotMode(uint8_t val);
DevinAlexander 0:b714c6a7c969 288
DevinAlexander 0:b714c6a7c969 289
DevinAlexander 0:b714c6a7c969 290 /**
DevinAlexander 0:b714c6a7c969 291 * @brief Sets bits in the configuration register zero for configuring open circuit fault detection
DevinAlexander 0:b714c6a7c969 292 * @param val \li CR0_OC_DETECT_DISABLED (Power On Default value)
DevinAlexander 0:b714c6a7c969 293 * \li CR0_OC_DETECT_ENABLED_R_LESS_5k
DevinAlexander 0:b714c6a7c969 294 * \li CR0_OC_DETECT_ENABLED_TC_LESS_2ms
DevinAlexander 0:b714c6a7c969 295 * \li CR0_OC_DETECT_ENABLED_TC_MORE_2ms
DevinAlexander 0:b714c6a7c969 296 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 297 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 298 */
DevinAlexander 0:b714c6a7c969 299 bool setOpenCircuitFaultDetection(uint8_t val);
DevinAlexander 0:b714c6a7c969 300
DevinAlexander 0:b714c6a7c969 301
DevinAlexander 0:b714c6a7c969 302 /**
DevinAlexander 0:b714c6a7c969 303 * @brief Sets bits in the configuration register zero for disabling or enabling the Cold Junction
DevinAlexander 0:b714c6a7c969 304 * @param val \li CR0_COLD_JUNC_ENABLE (Power On Default value)
DevinAlexander 0:b714c6a7c969 305 * \li CR0_COLD_JUNC_DISABLE
DevinAlexander 0:b714c6a7c969 306 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 307 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 308 */
DevinAlexander 0:b714c6a7c969 309 bool setColdJunctionDisable(uint8_t val);
DevinAlexander 0:b714c6a7c969 310
DevinAlexander 0:b714c6a7c969 311
DevinAlexander 0:b714c6a7c969 312 /**
DevinAlexander 0:b714c6a7c969 313 * @brief Sets bits in the configuration register zero for setting fault mode status
DevinAlexander 0:b714c6a7c969 314 * @param val \li CR0_FAULT_MODE_COMPARATOR (Power On Default value)
DevinAlexander 0:b714c6a7c969 315 * \li CR0_FAULT_MODE_INTERUPT
DevinAlexander 0:b714c6a7c969 316 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 317 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 318 */
DevinAlexander 0:b714c6a7c969 319 bool setFaultMode(uint8_t val);
DevinAlexander 0:b714c6a7c969 320
DevinAlexander 0:b714c6a7c969 321
DevinAlexander 0:b714c6a7c969 322 /**
DevinAlexander 0:b714c6a7c969 323 * @brief Sets bits in the configuration register zero for clearing fault status
DevinAlexander 0:b714c6a7c969 324 * @param val \li CR0_FAULTCLR_DEFAULT_VAL (Power On Default value)
DevinAlexander 0:b714c6a7c969 325 * \li CR0_FAULTCLR_RETURN_FAULTS_TO_ZERO (This bit self clears itself to default back to CR0_FAULTCLR_DEFAULT_VAL after fault status is cleared)
DevinAlexander 0:b714c6a7c969 326 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 327 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 328 */
DevinAlexander 0:b714c6a7c969 329 bool setFaultStatusClear(uint8_t val);
DevinAlexander 0:b714c6a7c969 330
DevinAlexander 0:b714c6a7c969 331
DevinAlexander 0:b714c6a7c969 332 /**
DevinAlexander 0:b714c6a7c969 333 * @brief Sets bits in the configuration register zero for setting which of the two filter modes either 50Hz or 60Hz cancelation
DevinAlexander 0:b714c6a7c969 334 * @param val \li CR0_FILTER_OUT_60Hz (Power On Default value)
DevinAlexander 0:b714c6a7c969 335 * \li CR0_FILTER_OUT_50Hz
DevinAlexander 0:b714c6a7c969 336 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 337 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 338 */
DevinAlexander 0:b714c6a7c969 339 bool setEmiFilterFreq(uint8_t val);
DevinAlexander 0:b714c6a7c969 340
DevinAlexander 0:b714c6a7c969 341
DevinAlexander 0:b714c6a7c969 342 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 343 //Functions for register CR1
DevinAlexander 0:b714c6a7c969 344 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 345 /**
DevinAlexander 0:b714c6a7c969 346 * @brief Sets bits in the configuration register one for setting how many readings are taken
DevinAlexander 0:b714c6a7c969 347 * @param val \li CR1_AVG_TC_SAMPLES_1 (Power On Default value)
DevinAlexander 0:b714c6a7c969 348 * \li CR1_AVG_TC_SAMPLES_2
DevinAlexander 0:b714c6a7c969 349 * \li CR1_AVG_TC_SAMPLES_4
DevinAlexander 0:b714c6a7c969 350 * \li CR1_AVG_TC_SAMPLES_8
DevinAlexander 0:b714c6a7c969 351 * \li CR1_AVG_TC_SAMPLES_16
DevinAlexander 0:b714c6a7c969 352 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 353 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 354 */
DevinAlexander 0:b714c6a7c969 355 bool setNumSamplesAvg(uint8_t val);
DevinAlexander 0:b714c6a7c969 356
DevinAlexander 0:b714c6a7c969 357
DevinAlexander 0:b714c6a7c969 358 /**
DevinAlexander 0:b714c6a7c969 359 * @brief Sets bits in the configuration register one for setting which thermocouple type is going to be programmed into the MAX31856 for linearization of thermovoltage produced and temperature
DevinAlexander 0:b714c6a7c969 360 * @param val \li CR1_TC_TYPE_B
DevinAlexander 0:b714c6a7c969 361 * \li CR1_TC_TYPE_E
DevinAlexander 0:b714c6a7c969 362 * \li CR1_TC_TYPE_J
DevinAlexander 0:b714c6a7c969 363 * \li CR1_TC_TYPE_K (Power On Default value)
DevinAlexander 0:b714c6a7c969 364 * \li CR1_TC_TYPE_N
DevinAlexander 0:b714c6a7c969 365 * \li CR1_TC_TYPE_R
DevinAlexander 0:b714c6a7c969 366 * \li CR1_TC_TYPE_S
DevinAlexander 0:b714c6a7c969 367 * \li CR1_TC_TYPE_T
DevinAlexander 0:b714c6a7c969 368 * \li CR1_TC_TYPE_VOLT_MODE_GAIN_8
DevinAlexander 0:b714c6a7c969 369 * \li CR1_TC_TYPE_VOLT_MODE_GAIN_32
DevinAlexander 0:b714c6a7c969 370 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 371 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 372 */
DevinAlexander 0:b714c6a7c969 373 bool setThermocoupleType(uint8_t val);
DevinAlexander 0:b714c6a7c969 374
DevinAlexander 0:b714c6a7c969 375
DevinAlexander 0:b714c6a7c969 376 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 377 //Functions for register MASK
DevinAlexander 0:b714c6a7c969 378 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 379 /**
DevinAlexander 0:b714c6a7c969 380 * @brief Sets bits in the configuration register one for setting fault masks
DevinAlexander 0:b714c6a7c969 381 * @param val \li MASK_CJ_FAULT_THRESHOLD_HIGH
DevinAlexander 0:b714c6a7c969 382 * \li MASK_CJ_FAULT_THRESHOLD_LOW
DevinAlexander 0:b714c6a7c969 383 * \li MASK_TC_FAULT_THRESHOLD_HIGH
DevinAlexander 0:b714c6a7c969 384 * \li MASK_TC_FAULT_THRESHOLD_LOW
DevinAlexander 0:b714c6a7c969 385 * \li MASK_OVER_UNDER_VOLT_FAULT
DevinAlexander 0:b714c6a7c969 386 * \li MASK_OPEN_CIRCUIT_FAULT
DevinAlexander 0:b714c6a7c969 387 * @param enable \li 0 for disabling the mask in whichever option is selcted in parameter val
DevinAlexander 0:b714c6a7c969 388 * \li 1 for enabling the mask in whichever option is selcted in parameter val
DevinAlexander 0:b714c6a7c969 389 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 390 * \li 0 if there is an incorrect parameter that is passed in as parameter val
DevinAlexander 0:b714c6a7c969 391 */
DevinAlexander 0:b714c6a7c969 392 bool setFaultMasks(uint8_t val, bool enable);
DevinAlexander 0:b714c6a7c969 393
DevinAlexander 0:b714c6a7c969 394
DevinAlexander 0:b714c6a7c969 395 /**
DevinAlexander 0:b714c6a7c969 396 * @brief Sets bits in the configuration register one for setting thresholds that corespond to the fault mask settings
DevinAlexander 0:b714c6a7c969 397 * @param val \li MASK_CJ_FAULT_THRESHOLD_HIGH
DevinAlexander 0:b714c6a7c969 398 * \li MASK_CJ_FAULT_THRESHOLD_LOW
DevinAlexander 0:b714c6a7c969 399 * \li MASK_TC_FAULT_THRESHOLD_HIGH
DevinAlexander 0:b714c6a7c969 400 * \li MASK_TC_FAULT_THRESHOLD_LOW
DevinAlexander 0:b714c6a7c969 401 * @param temperature value that you want to program into a threshold register for temperatre
DevinAlexander 0:b714c6a7c969 402 * @return return value that was programmed into the threshold register
DevinAlexander 0:b714c6a7c969 403 */
DevinAlexander 0:b714c6a7c969 404 bool setFaultThresholds(uint8_t val, float temperature);
DevinAlexander 0:b714c6a7c969 405
DevinAlexander 0:b714c6a7c969 406
DevinAlexander 0:b714c6a7c969 407 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 408 //Check Fault Status Functions
DevinAlexander 0:b714c6a7c969 409 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 410 /**
DevinAlexander 0:b714c6a7c969 411 * @brief Check the fault stautus register to see if there is anything wrong with range of thermocouple temperature
DevinAlexander 0:b714c6a7c969 412 * whether outside opperating temperatures or if above/below thresholds that are set
DevinAlexander 0:b714c6a7c969 413 * @return \li 0 if no faults are present
DevinAlexander 0:b714c6a7c969 414 * \li 1 if Thermocouple temp is higher than the threshold
DevinAlexander 0:b714c6a7c969 415 * \li 2 if Thermocouple temp is lower than the threshold
DevinAlexander 0:b714c6a7c969 416 * \li 3 if Thermocouple temp is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 417 * \li 4 if Thermocouple temp is higher than the threshold && is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 418 * \li 5 if Thermocouple temp is lower than the threshold && is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 419 */
DevinAlexander 0:b714c6a7c969 420 uint8_t checkFaultsThermocoupleThresholds();
DevinAlexander 0:b714c6a7c969 421
DevinAlexander 0:b714c6a7c969 422
DevinAlexander 0:b714c6a7c969 423 /**
DevinAlexander 0:b714c6a7c969 424 * @brief Check the fault stautus register to see if there is anything wrong with range of cold junction temperature
DevinAlexander 0:b714c6a7c969 425 * whether outside opperating temperatures or if above/below thresholds that are set
DevinAlexander 0:b714c6a7c969 426 * @return \li 0 if no faults are present
DevinAlexander 0:b714c6a7c969 427 * \li 1 if Cold Junction temp is higher than the threshold
DevinAlexander 0:b714c6a7c969 428 * \li 2 if Cold Junction temp is lower than the threshold
DevinAlexander 0:b714c6a7c969 429 * \li 3 if Cold Junction temp is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 430 * \li 4 if Cold Junction temp is higher than the threshold && is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 431 * \li 5 if Cold Junction temp is lower than the threshold && is outside operating range of termocouple type
DevinAlexander 0:b714c6a7c969 432 */
DevinAlexander 0:b714c6a7c969 433 uint8_t checkFaultsColdJunctionThresholds();
DevinAlexander 0:b714c6a7c969 434
DevinAlexander 0:b714c6a7c969 435
DevinAlexander 0:b714c6a7c969 436 /**
DevinAlexander 0:b714c6a7c969 437 * @brief Check the fault stautus register to see if there is anything wrong with thermocouple connection to the MAX31856
DevinAlexander 0:b714c6a7c969 438 * @return \li 1 if no faults are present
DevinAlexander 0:b714c6a7c969 439 * \li 0 if there is a fault and there needs to be information printed to the console to help diagnose issues
DevinAlexander 0:b714c6a7c969 440 */
DevinAlexander 0:b714c6a7c969 441 bool checkFaultsThermocoupleConnection();
DevinAlexander 0:b714c6a7c969 442
DevinAlexander 0:b714c6a7c969 443
DevinAlexander 0:b714c6a7c969 444 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 445 //General Functions
DevinAlexander 0:b714c6a7c969 446 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 447 /**
DevinAlexander 0:b714c6a7c969 448 * @brief This function is to read current contents of register, manipulate the contents, then rewrite the specific register\n
DevinAlexander 0:b714c6a7c969 449 * \li Read the value of a register from contents of register matching the parameter read_address
DevinAlexander 0:b714c6a7c969 450 * \li Clear the bits needed to be changed by bitwise ANDing the read value with the 8 bit parameter clear_bits
DevinAlexander 0:b714c6a7c969 451 * \li Set the bits of interest in the 8 bit value by bitwise ORing the value from step two with parameter val
DevinAlexander 0:b714c6a7c969 452 * \li Rewrite to the register with the new 8 bit value to the register with the address with parameter write_address
DevinAlexander 0:b714c6a7c969 453 * @param read_address - Address of register to read the data before it's changed
DevinAlexander 0:b714c6a7c969 454 * @param write_address - Address of register to rewrite the changed data
DevinAlexander 0:b714c6a7c969 455 * @param clear_bits - Parameter that is
DevinAlexander 0:b714c6a7c969 456 * @param val - Bitfield that contains bits related to function specific settings
DevinAlexander 0:b714c6a7c969 457 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 458 */
DevinAlexander 0:b714c6a7c969 459 bool registerReadWriteByte(uint8_t read_address, uint8_t write_address, int clear_bits, uint8_t val);
DevinAlexander 0:b714c6a7c969 460
DevinAlexander 0:b714c6a7c969 461
DevinAlexander 0:b714c6a7c969 462 /**
DevinAlexander 0:b714c6a7c969 463 * @brief This function is to read current contents of register, manipulate the contents, then rewrite the specific register\n
DevinAlexander 0:b714c6a7c969 464 * \li Read the value of a register from contents of register matching the parameter read_address
DevinAlexander 0:b714c6a7c969 465 * \li Clear the bits needed to be changed by bitwise ANDing the read value with the 8 bit parameter clear_bits
DevinAlexander 0:b714c6a7c969 466 * \li Set the bits of interest in the 8 bit value by bitwise ORing the value from step two with parameter val
DevinAlexander 0:b714c6a7c969 467 * \li Write to the register with the new 8 bit value to the register with the address with parameter write_address
DevinAlexander 0:b714c6a7c969 468 * @param write_address - Address of register to rewrite the changed data
DevinAlexander 0:b714c6a7c969 469 * @param val - Byte of information that is going to be written to the regitser with the address that matches the parameter write_address
DevinAlexander 0:b714c6a7c969 470 * @return \li 1 on success
DevinAlexander 0:b714c6a7c969 471 */
DevinAlexander 0:b714c6a7c969 472 bool registerWriteByte(uint8_t write_address, uint8_t val);
DevinAlexander 0:b714c6a7c969 473
DevinAlexander 0:b714c6a7c969 474
DevinAlexander 0:b714c6a7c969 475 /**
DevinAlexander 0:b714c6a7c969 476 * @brief This function is to read current contents of register by passing in the address of the read address and return contents of the register
DevinAlexander 0:b714c6a7c969 477 * @param read_address - Address of register to read data from
DevinAlexander 0:b714c6a7c969 478 * @return \li byte contained in the address
DevinAlexander 0:b714c6a7c969 479 */
DevinAlexander 0:b714c6a7c969 480 uint8_t registerReadByte(uint8_t read_address);
DevinAlexander 0:b714c6a7c969 481
DevinAlexander 0:b714c6a7c969 482
DevinAlexander 0:b714c6a7c969 483 /**
DevinAlexander 0:b714c6a7c969 484 * @brief This function is to read current contents of register by passing in the address of the read address and return contents of the register
DevinAlexander 0:b714c6a7c969 485 * @param temperature - Float of value to offest the value of the cold junction offset by (must be between -8°C to +7.9375°C)
DevinAlexander 0:b714c6a7c969 486 * @return \li 1 on successfully updated coldjunction offset
DevinAlexander 0:b714c6a7c969 487 * \li 0 if parameter temperature does not fall between range -8°C to +7.9375°C
DevinAlexander 0:b714c6a7c969 488 */
DevinAlexander 0:b714c6a7c969 489 bool coldJunctionOffset(float temperature);
DevinAlexander 0:b714c6a7c969 490
DevinAlexander 0:b714c6a7c969 491
DevinAlexander 0:b714c6a7c969 492 private:
DevinAlexander 0:b714c6a7c969 493
DevinAlexander 0:b714c6a7c969 494 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 495 //Private Functions
DevinAlexander 0:b714c6a7c969 496 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 497 /** @brief Writes the chip seleect pin low to begin SPI communications */
DevinAlexander 0:b714c6a7c969 498 void spiEnable();
DevinAlexander 0:b714c6a7c969 499
DevinAlexander 0:b714c6a7c969 500
DevinAlexander 0:b714c6a7c969 501 /** @brief Writes the chip seleect pin high to end SPI communications */
DevinAlexander 0:b714c6a7c969 502 void spiDisable();
DevinAlexander 0:b714c6a7c969 503
DevinAlexander 0:b714c6a7c969 504 /** @brief Calculates minimum wait time for a conversion to take place */
DevinAlexander 0:b714c6a7c969 505 void calculateDelayTime();
DevinAlexander 0:b714c6a7c969 506
DevinAlexander 0:b714c6a7c969 507
DevinAlexander 0:b714c6a7c969 508 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 509 //Private Members
DevinAlexander 0:b714c6a7c969 510 //*****************************************************************************
DevinAlexander 0:b714c6a7c969 511 /// SPI object
DevinAlexander 0:b714c6a7c969 512 SPI& spi;
DevinAlexander 0:b714c6a7c969 513
DevinAlexander 0:b714c6a7c969 514 /// Chip select pin for SPI communications
DevinAlexander 0:b714c6a7c969 515 DigitalOut ncs;
DevinAlexander 0:b714c6a7c969 516
DevinAlexander 0:b714c6a7c969 517 /// Number of samples the thermocouple is configured to average
DevinAlexander 0:b714c6a7c969 518 uint8_t samples;
DevinAlexander 0:b714c6a7c969 519
DevinAlexander 0:b714c6a7c969 520 /// 0=thermocouple is set to one of 8 thermocouple types and 1=Thermocouple is configured to report in voltage mode
DevinAlexander 0:b714c6a7c969 521 bool voltage_mode;
DevinAlexander 0:b714c6a7c969 522
DevinAlexander 0:b714c6a7c969 523 /// 0=60Hz and 1=50Hz
DevinAlexander 0:b714c6a7c969 524 bool filter_mode;
DevinAlexander 0:b714c6a7c969 525
DevinAlexander 0:b714c6a7c969 526 /// 0=MAX31856 is off, so no conversion is taking place currently and 1=Always On and converting
DevinAlexander 0:b714c6a7c969 527 bool conversion_mode;
DevinAlexander 0:b714c6a7c969 528
DevinAlexander 0:b714c6a7c969 529 /// 0=cold junction is disabled and 1=cold junction is enabled
DevinAlexander 0:b714c6a7c969 530 bool cold_junction_enabled;
DevinAlexander 0:b714c6a7c969 531
DevinAlexander 0:b714c6a7c969 532 ///Define a return val for all boolean functions
DevinAlexander 0:b714c6a7c969 533 bool return_val;
DevinAlexander 0:b714c6a7c969 534
DevinAlexander 0:b714c6a7c969 535 ///Used to figure out when a new conversion is ready to go
DevinAlexander 0:b714c6a7c969 536 uint32_t lastReadTime;
DevinAlexander 0:b714c6a7c969 537
DevinAlexander 0:b714c6a7c969 538 ///How many conversions have taken place since conversion mode was switched into auto mode
DevinAlexander 0:b714c6a7c969 539 ///Also this value should be 0 if the mode is in oneshot mode
DevinAlexander 0:b714c6a7c969 540 uint32_t thermocouple_conversion_count;
DevinAlexander 0:b714c6a7c969 541
DevinAlexander 0:b714c6a7c969 542 ///time in milliseconds that is needed minimum for a new conversion to take place
DevinAlexander 0:b714c6a7c969 543 uint32_t conversion_time;
DevinAlexander 0:b714c6a7c969 544 };
DevinAlexander 0:b714c6a7c969 545
DevinAlexander 0:b714c6a7c969 546 #endif /* __MAX31856_H_ */