Maxim Integrated / Mbed OS MAX31875_Temperature_Sensor_Small_WLP

Sample host software for the Maxim Integrated MAX31875 Low Power Small Package Temperature Sensor. Hosted on the MAX32630FTHR. The MAX31875 may be used in wearables, thermostats, thermometers, and hardware temperature supervisors.

Dependencies:   MAX31875_Temperature_Sensor_Low_Power max32630fthr USBDevice

main.cpp@1:c5ac6967b6bf, 2019-02-04 (annotated)

Committer:
phonemacro
Date:
Mon Feb 04 23:39:11 2019 +0000
Revision:
1:c5ac6967b6bf
Parent:
0:77036686489d
Child:
2:32c0d11d8c0d
added c version of the driver.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phonemacro 0:77036686489d 1 /*******************************************************************************
phonemacro 0:77036686489d 2 * Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved.
phonemacro 0:77036686489d 3 *
phonemacro 0:77036686489d 4 * Permission is hereby granted, free of charge, to any person obtaining a
phonemacro 0:77036686489d 5 * copy of this software and associated documentation files (the "Software"),
phonemacro 0:77036686489d 6 * to deal in the Software without restriction, including without limitation
phonemacro 0:77036686489d 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
phonemacro 0:77036686489d 8 * and/or sell copies of the Software, and to permit persons to whom the
phonemacro 0:77036686489d 9 * Software is furnished to do so, subject to the following conditions:
phonemacro 0:77036686489d 10 *
phonemacro 0:77036686489d 11 * The above copyright notice and this permission notice shall be included
phonemacro 0:77036686489d 12 * in all copies or substantial portions of the Software.
phonemacro 0:77036686489d 13 *
phonemacro 0:77036686489d 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
phonemacro 0:77036686489d 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
phonemacro 0:77036686489d 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
phonemacro 0:77036686489d 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
phonemacro 0:77036686489d 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
phonemacro 0:77036686489d 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
phonemacro 0:77036686489d 20 * OTHER DEALINGS IN THE SOFTWARE.
phonemacro 0:77036686489d 21 *
phonemacro 0:77036686489d 22 * Except as contained in this notice, the name of Maxim Integrated
phonemacro 0:77036686489d 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
phonemacro 0:77036686489d 24 * Products, Inc. Branding Policy.
phonemacro 0:77036686489d 25 *
phonemacro 0:77036686489d 26 * The mere transfer of this software does not imply any licenses
phonemacro 0:77036686489d 27 * of trade secrets, proprietary technology, copyrights, patents,
phonemacro 0:77036686489d 28 * trademarks, maskwork rights, or any other form of intellectual
phonemacro 0:77036686489d 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
phonemacro 0:77036686489d 30 * ownership rights.
phonemacro 0:77036686489d 31 *******************************************************************************
phonemacro 0:77036686489d 32 */
phonemacro 0:77036686489d 33 #include "mbed.h"
phonemacro 0:77036686489d 34 #include "max32630fthr.h"
phonemacro 0:77036686489d 35 #include "max31875.h"
phonemacro 1:c5ac6967b6bf 36 #include "max31875_cpp.h"
phonemacro 0:77036686489d 37 #include "USBSerial.h"
phonemacro 0:77036686489d 38
phonemacro 0:77036686489d 39 MAX32630FTHR pegasus(MAX32630FTHR::VIO_1V8);
phonemacro 0:77036686489d 40
phonemacro 0:77036686489d 41 DigitalOut rLED(LED1);
phonemacro 0:77036686489d 42 DigitalOut gLED(LED2);
phonemacro 0:77036686489d 43 DigitalOut bLED(LED3);
phonemacro 0:77036686489d 44
phonemacro 0:77036686489d 45 I2C i2cBus(P3_4, P3_5);
phonemacro 0:77036686489d 46
phonemacro 0:77036686489d 47 // main() runs in its own thread in the OS
phonemacro 0:77036686489d 48 // (note the calls to Thread::wait below for delays)
phonemacro 0:77036686489d 49 /**
phonemacro 0:77036686489d 50 * @brief Sample main program for MAX31875
phonemacro 1:c5ac6967b6bf 51 * @version 1.0000.0001
phonemacro 0:77036686489d 52 *
phonemacro 0:77036686489d 53 * @details Sample main program for MAX31875
phonemacro 0:77036686489d 54 * The prints are sent to the terminal window (9600, 8n1).
phonemacro 0:77036686489d 55 * The program sets the GPIOs to 1.8V and the program
phonemacro 0:77036686489d 56 * configures the chip and reads temperatures.
phonemacro 0:77036686489d 57 * To run the program, drag and drop the .bin file into the
phonemacro 0:77036686489d 58 * DAPLINK folder. After it finishes flashing, cycle the power or
phonemacro 0:77036686489d 59 * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on
phonemacro 0:77036686489d 60 * the Pegasus next to the battery connector or the button
phonemacro 0:77036686489d 61 * on the MAXREFDES100HDK.
phonemacro 0:77036686489d 62 */
phonemacro 0:77036686489d 63 int main()
phonemacro 0:77036686489d 64 {
phonemacro 0:77036686489d 65 uint32_t i;
phonemacro 0:77036686489d 66 float temperature;
phonemacro 0:77036686489d 67 uint16_t cfg;
phonemacro 0:77036686489d 68 DigitalOut rLED(LED1, LED_OFF);
phonemacro 0:77036686489d 69 DigitalOut gLED(LED2, LED_OFF);
phonemacro 0:77036686489d 70 DigitalOut bLED(LED3, LED_OFF);
phonemacro 0:77036686489d 71 gLED = LED_ON;
phonemacro 0:77036686489d 72 printf("MAX31875 Small Package Temperature Sensor example source code.\r\n");
phonemacro 0:77036686489d 73 printf("\r\n");
phonemacro 0:77036686489d 74
phonemacro 0:77036686489d 75 MAX31875 temp_sensor(i2cBus, MAX31875_I2C_SLAVE_ADR_R0);
phonemacro 0:77036686489d 76 i2cBus.frequency(1000000);
phonemacro 0:77036686489d 77
phonemacro 0:77036686489d 78 /* Configure for fault filter 1, comparator, continuous,
phonemacro 0:77036686489d 79 * normal format, 8 sps, 12 bit resolution
phonemacro 0:77036686489d 80 */
phonemacro 0:77036686489d 81 temp_sensor.write_cfg(uint16_t(MAX31875_CFG_FAULT_FILTER_1 |
phonemacro 0:77036686489d 82 MAX31875_CFG_COMPARATOR_MODE | MAX31875_CFG_CONTINUOUS |
phonemacro 0:77036686489d 83 MAX31875_CFG_NORMAL_FORMAT | MAX31875_CFG_CONV_RATE_8 |
phonemacro 0:77036686489d 84 MAX31875_CFG_RESOLUTION_12BIT));
phonemacro 0:77036686489d 85 for (i = 0; i < 10; i++) {
phonemacro 0:77036686489d 86 wait(MAX31875_WAIT_CONV_RATE_8);
phonemacro 0:77036686489d 87 temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE);
phonemacro 0:77036686489d 88 printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:77036686489d 89 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:77036686489d 90 }
phonemacro 0:77036686489d 91 temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION);
phonemacro 0:77036686489d 92 printf("Configuration Register = 0x%04Xh \r\n", cfg);
phonemacro 0:77036686489d 93
phonemacro 0:77036686489d 94 printf("\r\n");
phonemacro 0:77036686489d 95
phonemacro 0:77036686489d 96
phonemacro 0:77036686489d 97 /* Configure for fault filter 4, interrupt, shutdown,
phonemacro 0:77036686489d 98 * extended format, 0.25 sps, 10 bit resolution, start one-shot
phonemacro 0:77036686489d 99 */
phonemacro 0:77036686489d 100 for (i = 0; i < 5; i++) {
phonemacro 0:77036686489d 101 temp_sensor.write_cfg(uint16_t(MAX31875_CFG_FAULT_FILTER_4 |
phonemacro 0:77036686489d 102 MAX31875_CFG_INTERRUPT_MODE | MAX31875_CFG_SHUTDOWN |
phonemacro 0:77036686489d 103 MAX31875_CFG_EXTENDED_FORMAT| MAX31875_CFG_CONV_RATE_0_25 |
phonemacro 0:77036686489d 104 MAX31875_CFG_RESOLUTION_10BIT | MAX31875_CFG_ONE_SHOT_START));
phonemacro 0:77036686489d 105 wait(MAX31875_WAIT_CONV_RATE_0_25);
phonemacro 0:77036686489d 106 temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE);
phonemacro 0:77036686489d 107 printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:77036686489d 108 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:77036686489d 109 }
phonemacro 0:77036686489d 110 temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION);
phonemacro 0:77036686489d 111 printf("Configuration Register = 0x%04Xh \r\n", cfg);
phonemacro 0:77036686489d 112
phonemacro 0:77036686489d 113 printf("\r\n\r\n");
phonemacro 0:77036686489d 114 #if 0
phonemacro 0:77036686489d 115 temp_sensor.write_trip_low(3.0625f);
phonemacro 0:77036686489d 116 temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION);
phonemacro 0:77036686489d 117 temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_THYST);
phonemacro 0:77036686489d 118 printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:77036686489d 119 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:77036686489d 120
phonemacro 0:77036686489d 121 temp_sensor.write_trip_high(129.0625f);
phonemacro 0:77036686489d 122 temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TOS);
phonemacro 0:77036686489d 123 printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 0:77036686489d 124 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 0:77036686489d 125 printf("\r\n\r\n");
phonemacro 0:77036686489d 126 #endif
phonemacro 1:c5ac6967b6bf 127
phonemacro 1:c5ac6967b6bf 128 /***************************************************************************
phonemacro 1:c5ac6967b6bf 129 * Call the C code version of the driver
phonemacro 1:c5ac6967b6bf 130 ***************************************************************************
phonemacro 1:c5ac6967b6bf 131 */
phonemacro 1:c5ac6967b6bf 132 #include "max31875_c.h"
phonemacro 1:c5ac6967b6bf 133 max31875_init(MAX31875_I2C_SLAVE_ADR_R0);
phonemacro 1:c5ac6967b6bf 134 /* Configure for fault filter 1, comparator, continuous,
phonemacro 1:c5ac6967b6bf 135 * normal format, 8 sps, 12 bit resolution
phonemacro 1:c5ac6967b6bf 136 */
phonemacro 1:c5ac6967b6bf 137 max31875_write_cfg(uint16_t(MAX31875_CFG_FAULT_FILTER_1 |
phonemacro 1:c5ac6967b6bf 138 MAX31875_CFG_COMPARATOR_MODE | MAX31875_CFG_CONTINUOUS |
phonemacro 1:c5ac6967b6bf 139 MAX31875_CFG_NORMAL_FORMAT | MAX31875_CFG_CONV_RATE_8 |
phonemacro 1:c5ac6967b6bf 140 MAX31875_CFG_RESOLUTION_12BIT), i2cBus);
phonemacro 1:c5ac6967b6bf 141 for (i = 0; i < 10; i++) {
phonemacro 1:c5ac6967b6bf 142 wait(MAX31875_WAIT_CONV_RATE_8);
phonemacro 1:c5ac6967b6bf 143 temperature = max31875_read_reg_as_temperature(MAX31875_REG_TEMPERATURE,
phonemacro 1:c5ac6967b6bf 144 i2cBus);
phonemacro 1:c5ac6967b6bf 145 printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n",
phonemacro 1:c5ac6967b6bf 146 temperature, temp_sensor.celsius_to_fahrenheit(temperature));
phonemacro 1:c5ac6967b6bf 147 }
phonemacro 1:c5ac6967b6bf 148 max31875_read_reg(&cfg, MAX31875_REG_CONFIGURATION, i2cBus);
phonemacro 1:c5ac6967b6bf 149 printf("Configuration Register = 0x%04Xh \r\n", cfg);
phonemacro 1:c5ac6967b6bf 150
phonemacro 1:c5ac6967b6bf 151
phonemacro 0:77036686489d 152 while (true) { // Blink the green LED
phonemacro 0:77036686489d 153 gLED = !gLED;
phonemacro 0:77036686489d 154 wait(0.5);
phonemacro 0:77036686489d 155 }
phonemacro 0:77036686489d 156 }
phonemacro 0:77036686489d 157
phonemacro 0:77036686489d 158