David Jung / Mbed OS MAX31725_High_Temperature_Accurate_IC

Sample main.c/cpp code for the Maxim Integrated MAX31725, MAX31726 high temperature sensor with accuracy of to +-0.5°C. Hosted on the MAX32630FTHR. Typical applications are for thermometers, thermostats, and high temperature alarm monitoring.

Dependencies:   MAX31725_Accurate_Temperature_Sensor max32630fthr USBDevice

main.cpp@2:1890f1449f7c, 2019-04-10 (annotated)

Committer:
phonemacro
Date:
Wed Apr 10 19:30:46 2019 +0000
Revision:
2:1890f1449f7c
Parent:
1:5d32aeb8387e 
updated waits for one-shots

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phonemacro 0:08830daf46a0 1 /*******************************************************************************
phonemacro 0:08830daf46a0 2 * Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved.
phonemacro 0:08830daf46a0 3 *
phonemacro 0:08830daf46a0 4 * Permission is hereby granted, free of charge, to any person obtaining a
phonemacro 0:08830daf46a0 5 * copy of this software and associated documentation files (the "Software"),
phonemacro 0:08830daf46a0 6 * to deal in the Software without restriction, including without limitation
phonemacro 0:08830daf46a0 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
phonemacro 0:08830daf46a0 8 * and/or sell copies of the Software, and to permit persons to whom the
phonemacro 0:08830daf46a0 9 * Software is furnished to do so, subject to the following conditions:
phonemacro 0:08830daf46a0 10 *
phonemacro 0:08830daf46a0 11 * The above copyright notice and this permission notice shall be included
phonemacro 0:08830daf46a0 12 * in all copies or substantial portions of the Software.
phonemacro 0:08830daf46a0 13 *
phonemacro 0:08830daf46a0 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
phonemacro 0:08830daf46a0 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
phonemacro 0:08830daf46a0 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
phonemacro 0:08830daf46a0 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
phonemacro 0:08830daf46a0 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
phonemacro 0:08830daf46a0 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
phonemacro 0:08830daf46a0 20 * OTHER DEALINGS IN THE SOFTWARE.
phonemacro 0:08830daf46a0 21 *
phonemacro 0:08830daf46a0 22 * Except as contained in this notice, the name of Maxim Integrated
phonemacro 0:08830daf46a0 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
phonemacro 0:08830daf46a0 24 * Products, Inc. Branding Policy.
phonemacro 0:08830daf46a0 25 *
phonemacro 0:08830daf46a0 26 * The mere transfer of this software does not imply any licenses
phonemacro 0:08830daf46a0 27 * of trade secrets, proprietary technology, copyrights, patents,
phonemacro 0:08830daf46a0 28 * trademarks, maskwork rights, or any other form of intellectual
phonemacro 0:08830daf46a0 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
phonemacro 0:08830daf46a0 30 * ownership rights.
phonemacro 0:08830daf46a0 31 *******************************************************************************
phonemacro 0:08830daf46a0 32 */
phonemacro 0:08830daf46a0 33 #include "mbed.h"
phonemacro 0:08830daf46a0 34 #include "max32630fthr.h"
phonemacro 0:08830daf46a0 35 #include "max31725.h"
phonemacro 0:08830daf46a0 36 #include "max31725_cpp.h"
phonemacro 0:08830daf46a0 37 #include "USBSerial.h"
phonemacro 2:1890f1449f7c 38
phonemacro 2:1890f1449f7c 39 Serial pc(USBTX, USBRX); // Use USB debug probe for serial link
phonemacro 2:1890f1449f7c 40 Serial uart(P2_1, P2_0);
phonemacro 2:1890f1449f7c 41 void wait_sec_prompt(uint8_t time)
phonemacro 2:1890f1449f7c 42 {
phonemacro 2:1890f1449f7c 43 // Ports and serial connections
phonemacro 2:1890f1449f7c 44 uint32_t i;
phonemacro 2:1890f1449f7c 45 for (i = 0; i < time; i++) {
phonemacro 2:1890f1449f7c 46 pc.printf(".");
phonemacro 2:1890f1449f7c 47 wait(1);
phonemacro 2:1890f1449f7c 48 }
phonemacro 2:1890f1449f7c 49 pc.printf("\r\n");
phonemacro 2:1890f1449f7c 50 }
phonemacro 2:1890f1449f7c 51
phonemacro 2:1890f1449f7c 52
phonemacro 0:08830daf46a0 53 MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
phonemacro 0:08830daf46a0 54
phonemacro 0:08830daf46a0 55 DigitalOut rLED(LED1);
phonemacro 0:08830daf46a0 56 DigitalOut gLED(LED2);
phonemacro 0:08830daf46a0 57 DigitalOut bLED(LED3);
phonemacro 0:08830daf46a0 58
phonemacro 0:08830daf46a0 59 I2C i2cBus(P3_4, P3_5);
phonemacro 0:08830daf46a0 60
phonemacro 0:08830daf46a0 61 // main() runs in its own thread in the OS
phonemacro 0:08830daf46a0 62 // (note the calls to Thread::wait below for delays)
phonemacro 0:08830daf46a0 63 /**
phonemacro 0:08830daf46a0 64 * @brief Sample main program for MAX31725
phonemacro 0:08830daf46a0 65 * @version 1.0000.0002
phonemacro 0:08830daf46a0 66 *
phonemacro 0:08830daf46a0 67 * @details Sample main program for MAX31725
phonemacro 0:08830daf46a0 68 * The prints are sent to the terminal window (9600, 8n1).
phonemacro 0:08830daf46a0 69 * The program sets the GPIOs to 3.3V and the program
phonemacro 0:08830daf46a0 70 * configures the chip and reads temperatures.
phonemacro 0:08830daf46a0 71 * To run the program, drag and drop the .bin file into the
phonemacro 0:08830daf46a0 72 * DAPLINK folder. After it finishes flashing, cycle the power or
phonemacro 0:08830daf46a0 73 * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on
phonemacro 0:08830daf46a0 74 * the Pegasus next to the battery connector or the button
phonemacro 0:08830daf46a0 75 * on the MAXREFDES100HDK.
phonemacro 0:08830daf46a0 76 */
phonemacro 0:08830daf46a0 77 int main()
phonemacro 0:08830daf46a0 78 {
phonemacro 0:08830daf46a0 79 uint32_t i;
phonemacro 0:08830daf46a0 80 float temperature;
phonemacro 0:08830daf46a0 81 uint8_t cfg;
phonemacro 0:08830daf46a0 82 DigitalOut rLED(LED1, LED_OFF);
phonemacro 0:08830daf46a0 83 DigitalOut gLED(LED2, LED_OFF);
phonemacro 0:08830daf46a0 84 DigitalOut bLED(LED3, LED_OFF);
phonemacro 0:08830daf46a0 85 gLED = LED_ON;
phonemacro 2:1890f1449f7c 86 pc.baud(9600); // Baud rate = 115200
phonemacro 2:1890f1449f7c 87 pc.printf("MAX31725 Digital Thermometer and "
phonemacro 0:08830daf46a0 88 "Thermostat example source code.\r\n");
phonemacro 2:1890f1449f7c 89 pc.printf("\r\n");
phonemacro 1:5d32aeb8387e 90 uint8_t i2c_addr = MAX31725_I2C_SLAVE_ADR_21;
phonemacro 1:5d32aeb8387e 91 MAX31725 temp_sensor(i2cBus, i2c_addr);
phonemacro 0:08830daf46a0 92 i2cBus.frequency(400000);
phonemacro 0:08830daf46a0 93 /* Configure for time out enabled, normal format, fault filter 6,
phonemacro 0:08830daf46a0 94 active low polarity, comparator mode, continuous
phonemacro 0:08830daf46a0 95 */
phonemacro 0:08830daf46a0 96 temp_sensor.write_cfg_reg(uint8_t(MAX31725_CFG_TIMEOUT_ENABLE |
phonemacro 0:08830daf46a0 97 MAX31725_CFG_NORMAL_FORMAT| MAX31725_CFG_FAULT_FILTER_6 |
phonemacro 0:08830daf46a0 98 MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE |
phonemacro 0:08830daf46a0 99 MAX31725_CFG_CONTINUOUS));
phonemacro 0:08830daf46a0 100 for (i = 0; i < 10; i++) {
phonemacro 0:08830daf46a0 101 wait(MAX31725_WAIT_CONV_TIME);
phonemacro 0:08830daf46a0 102 temperature =
phonemacro 0:08830daf46a0 103 temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE);
phonemacro 2:1890f1449f7c 104 pc.printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 105 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 106 }
phonemacro 0:08830daf46a0 107 temp_sensor.read_cfg_reg(&cfg);
phonemacro 2:1890f1449f7c 108 pc.printf("Configuration Register = 0x%02Xh \r\n", cfg);
phonemacro 0:08830daf46a0 109 #if 0
phonemacro 0:08830daf46a0 110 temp_sensor.write_trip_low_thyst(-63.9375);
phonemacro 0:08830daf46a0 111 temperature =
phonemacro 0:08830daf46a0 112 temp_sensor.read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP);
phonemacro 2:1890f1449f7c 113 pc.printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 114 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 115
phonemacro 0:08830daf46a0 116 temp_sensor.write_trip_high_tos(64.0625f);
phonemacro 0:08830daf46a0 117 temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP);
phonemacro 2:1890f1449f7c 118 pc.printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 119 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 2:1890f1449f7c 120 pc.printf("\r\n\r\n");
phonemacro 0:08830daf46a0 121 #endif
phonemacro 0:08830daf46a0 122
phonemacro 2:1890f1449f7c 123 pc.printf("\r\n");
phonemacro 2:1890f1449f7c 124 temp_sensor.write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START |
phonemacro 2:1890f1449f7c 125 MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT |
phonemacro 2:1890f1449f7c 126 MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW |
phonemacro 2:1890f1449f7c 127 MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN));
phonemacro 0:08830daf46a0 128 for (i = 0; i < 8; i++) {
phonemacro 2:1890f1449f7c 129 wait_sec_prompt(10); /* leave it in shutdown mode for a while */
phonemacro 0:08830daf46a0 130 /* Configure for one shot, time out disabled, extended format, fault filter 4,
phonemacro 0:08830daf46a0 131 active low polarity, comparator mode, shutdown
phonemacro 0:08830daf46a0 132 */
phonemacro 0:08830daf46a0 133 temp_sensor.write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START |
phonemacro 0:08830daf46a0 134 MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT |
phonemacro 0:08830daf46a0 135 MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW |
phonemacro 0:08830daf46a0 136 MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN));
phonemacro 0:08830daf46a0 137 wait(MAX31725_WAIT_CONV_TIME);
phonemacro 0:08830daf46a0 138 temperature =
phonemacro 0:08830daf46a0 139 temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE);
phonemacro 2:1890f1449f7c 140 pc.printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 141 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 142 }
phonemacro 0:08830daf46a0 143 temp_sensor.read_cfg_reg(&cfg);
phonemacro 2:1890f1449f7c 144 pc.printf("Configuration Register = 0x%02Xh \r\n", cfg);
phonemacro 0:08830daf46a0 145
phonemacro 2:1890f1449f7c 146 pc.printf("\r\n\r\n");
phonemacro 0:08830daf46a0 147
phonemacro 0:08830daf46a0 148 #if 0
phonemacro 0:08830daf46a0 149 temp_sensor.write_trip_low_thyst(-55.0f);
phonemacro 0:08830daf46a0 150 temperature =
phonemacro 0:08830daf46a0 151 temp_sensor.read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP);
phonemacro 2:1890f1449f7c 152 pc.printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 153 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 154
phonemacro 0:08830daf46a0 155 temp_sensor.write_trip_high_tos(125.0f);
phonemacro 0:08830daf46a0 156 temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP);
phonemacro 2:1890f1449f7c 157 pc.printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 158 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 2:1890f1449f7c 159 pc.printf("\r\n\r\n");
phonemacro 0:08830daf46a0 160 #endif
phonemacro 0:08830daf46a0 161
phonemacro 0:08830daf46a0 162 /***************************************************************************
phonemacro 0:08830daf46a0 163 * Call the C code version of the driver
phonemacro 0:08830daf46a0 164 ***************************************************************************
phonemacro 0:08830daf46a0 165 */
phonemacro 0:08830daf46a0 166 #include "max31725_c.h"
phonemacro 2:1890f1449f7c 167 pc.printf("C implementation of the code\r\n");
phonemacro 1:5d32aeb8387e 168 max31725_init(i2c_addr);
phonemacro 0:08830daf46a0 169 /* Configure for time out enabled, normal format, fault filter 6,
phonemacro 0:08830daf46a0 170 active low polarity, comparator mode, continuous
phonemacro 0:08830daf46a0 171 */
phonemacro 0:08830daf46a0 172 max31725_write_cfg_reg(uint8_t(MAX31725_CFG_TIMEOUT_ENABLE |
phonemacro 0:08830daf46a0 173 MAX31725_CFG_NORMAL_FORMAT | MAX31725_CFG_FAULT_FILTER_6 |
phonemacro 0:08830daf46a0 174 MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE |
phonemacro 0:08830daf46a0 175 MAX31725_CFG_CONTINUOUS), i2cBus);
phonemacro 0:08830daf46a0 176 /* Configure for 9 bit resolution, fault filter 1,
phonemacro 0:08830daf46a0 177 active low, comparator, continuous,
phonemacro 0:08830daf46a0 178 */
phonemacro 0:08830daf46a0 179 for (i = 0; i < 10; i++) {
phonemacro 0:08830daf46a0 180 wait(MAX31725_WAIT_CONV_TIME);
phonemacro 0:08830daf46a0 181 temperature = max31725_read_reg_as_temperature(MAX31725_REG_TEMPERATURE,
phonemacro 0:08830daf46a0 182 i2cBus);
phonemacro 2:1890f1449f7c 183 pc.printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 184 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 185 }
phonemacro 0:08830daf46a0 186
phonemacro 0:08830daf46a0 187 max31725_read_cfg_reg(&cfg, i2cBus);
phonemacro 2:1890f1449f7c 188 pc.printf("Configuration Register = 0x%02Xh \r\n", cfg);
phonemacro 0:08830daf46a0 189
phonemacro 0:08830daf46a0 190 #if 0
phonemacro 0:08830daf46a0 191 max31725_write_trip_low_thyst(-63.9375, i2cBus);
phonemacro 0:08830daf46a0 192 temperature = max31725_read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP,
phonemacro 0:08830daf46a0 193 i2cBus);
phonemacro 2:1890f1449f7c 194 pc.printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 195 temperature, max31725_celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 196
phonemacro 0:08830daf46a0 197 max31725_write_trip_high_tos(64.0625f, i2cBus);
phonemacro 0:08830daf46a0 198 temperature = max31725_read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP,
phonemacro 0:08830daf46a0 199 i2cBus);
phonemacro 2:1890f1449f7c 200 pc.printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 201 temperature, max31725_celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 202 #endif
phonemacro 0:08830daf46a0 203
phonemacro 2:1890f1449f7c 204 pc.printf("\r\n");
phonemacro 2:1890f1449f7c 205 max31725_write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START |
phonemacro 2:1890f1449f7c 206 MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT |
phonemacro 2:1890f1449f7c 207 MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW |
phonemacro 2:1890f1449f7c 208 MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN), i2cBus);
phonemacro 0:08830daf46a0 209 for (i = 0; i < 8; i++) {
phonemacro 2:1890f1449f7c 210 wait_sec_prompt(10); /* leave it in shutdown mode for a while */
phonemacro 0:08830daf46a0 211 /* Configure for one shot, time out disabled, extended format, fault filter 4,
phonemacro 0:08830daf46a0 212 active low polarity, comparator mode, shutdown
phonemacro 0:08830daf46a0 213 */
phonemacro 0:08830daf46a0 214 max31725_write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START |
phonemacro 0:08830daf46a0 215 MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT |
phonemacro 0:08830daf46a0 216 MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW |
phonemacro 0:08830daf46a0 217 MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN), i2cBus);
phonemacro 0:08830daf46a0 218 wait(MAX31725_WAIT_CONV_TIME);
phonemacro 0:08830daf46a0 219 temperature = max31725_read_reg_as_temperature(MAX31725_REG_TEMPERATURE,
phonemacro 0:08830daf46a0 220 i2cBus);
phonemacro 2:1890f1449f7c 221 pc.printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 222 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 223 }
phonemacro 0:08830daf46a0 224 max31725_read_cfg_reg(&cfg, i2cBus);
phonemacro 2:1890f1449f7c 225 pc.printf("Configuration Register = 0x%02Xh \r\n", cfg);
phonemacro 0:08830daf46a0 226
phonemacro 0:08830daf46a0 227 #if 0
phonemacro 0:08830daf46a0 228 max31725_write_trip_low_thyst(-55, i2cBus);
phonemacro 0:08830daf46a0 229 temperature = max31725_read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP,
phonemacro 0:08830daf46a0 230 i2cBus);
phonemacro 2:1890f1449f7c 231 pc.printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 232 temperature, max31725_celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 233
phonemacro 0:08830daf46a0 234 max31725_write_trip_high_tos(125.0f, i2cBus);
phonemacro 0:08830daf46a0 235 temperature = max31725_read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP,
phonemacro 0:08830daf46a0 236 i2cBus);
phonemacro 2:1890f1449f7c 237 pc.printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:08830daf46a0 238 temperature, max31725_celsius_to_fahrenheit(temperature));
phonemacro 0:08830daf46a0 239 #endif
phonemacro 2:1890f1449f7c 240 pc.printf("\r\n\r\n\r\n");
phonemacro 0:08830daf46a0 241
phonemacro 0:08830daf46a0 242
phonemacro 0:08830daf46a0 243 while (true) { // Blink the green LED
phonemacro 0:08830daf46a0 244 gLED = !gLED;
phonemacro 0:08830daf46a0 245 wait(0.5);
phonemacro 0:08830daf46a0 246 }
phonemacro 0:08830daf46a0 247 }
phonemacro 0:08830daf46a0 248
phonemacro 0:08830daf46a0 249