![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
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
- Committer:
- phonemacro
- Date:
- 2019-04-09
- Revision:
- 0:08830daf46a0
- Child:
- 1:5d32aeb8387e
File content as of revision 0:08830daf46a0:
/******************************************************************************* * Copyright (C) 2019 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. ******************************************************************************* */ #include "mbed.h" #include "max32630fthr.h" #include "max31725.h" #include "max31725_cpp.h" #include "USBSerial.h" MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3); DigitalOut rLED(LED1); DigitalOut gLED(LED2); DigitalOut bLED(LED3); I2C i2cBus(P3_4, P3_5); // main() runs in its own thread in the OS // (note the calls to Thread::wait below for delays) /** * @brief Sample main program for MAX31725 * @version 1.0000.0002 * * @details Sample main program for MAX31725 * The prints are sent to the terminal window (9600, 8n1). * The program sets the GPIOs to 3.3V and the program * configures the chip and reads temperatures. * To run the program, drag and drop the .bin file into the * DAPLINK folder. After it finishes flashing, cycle the power or * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on * the Pegasus next to the battery connector or the button * on the MAXREFDES100HDK. */ int main() { uint32_t i; float temperature; uint8_t cfg; DigitalOut rLED(LED1, LED_OFF); DigitalOut gLED(LED2, LED_OFF); DigitalOut bLED(LED3, LED_OFF); gLED = LED_ON; printf("MAX31725 Digital Thermometer and " "Thermostat example source code.\r\n"); printf("\r\n"); MAX31725 temp_sensor(i2cBus, MAX31725_I2C_SLAVE_ADR_R7); i2cBus.frequency(400000); /* Configure for time out enabled, normal format, fault filter 6, active low polarity, comparator mode, continuous */ temp_sensor.write_cfg_reg(uint8_t(MAX31725_CFG_TIMEOUT_ENABLE | MAX31725_CFG_NORMAL_FORMAT| MAX31725_CFG_FAULT_FILTER_6 | MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_CONTINUOUS)); for (i = 0; i < 10; i++) { wait(MAX31725_WAIT_CONV_TIME); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE); printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); } temp_sensor.read_cfg_reg(&cfg); printf("Configuration Register = 0x%02Xh \r\n", cfg); #if 0 temp_sensor.write_trip_low_thyst(-63.9375); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP); printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); temp_sensor.write_trip_high_tos(64.0625f); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP); printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); printf("\r\n\r\n"); #endif printf("\r\n"); for (i = 0; i < 8; i++) { /* Configure for one shot, time out disabled, extended format, fault filter 4, active low polarity, comparator mode, shutdown */ temp_sensor.write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START | MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT | MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN)); wait(MAX31725_WAIT_CONV_TIME); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TEMPERATURE); printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); wait(2); /* leave it in shutdown mode for a while */ } temp_sensor.read_cfg_reg(&cfg); printf("Configuration Register = 0x%02Xh \r\n", cfg); printf("\r\n\r\n"); #if 0 temp_sensor.write_trip_low_thyst(-55.0f); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP); printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); temp_sensor.write_trip_high_tos(125.0f); temperature = temp_sensor.read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP); printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); printf("\r\n\r\n"); #endif /*************************************************************************** * Call the C code version of the driver *************************************************************************** */ #include "max31725_c.h" printf("C implementation of the code\r\n"); max31725_init(MAX31725_I2C_SLAVE_ADR_R7); /* Configure for time out enabled, normal format, fault filter 6, active low polarity, comparator mode, continuous */ max31725_write_cfg_reg(uint8_t(MAX31725_CFG_TIMEOUT_ENABLE | MAX31725_CFG_NORMAL_FORMAT | MAX31725_CFG_FAULT_FILTER_6 | MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_CONTINUOUS), i2cBus); /* Configure for 9 bit resolution, fault filter 1, active low, comparator, continuous, */ for (i = 0; i < 10; i++) { wait(MAX31725_WAIT_CONV_TIME); temperature = max31725_read_reg_as_temperature(MAX31725_REG_TEMPERATURE, i2cBus); printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); } max31725_read_cfg_reg(&cfg, i2cBus); printf("Configuration Register = 0x%02Xh \r\n", cfg); #if 0 max31725_write_trip_low_thyst(-63.9375, i2cBus); temperature = max31725_read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP, i2cBus); printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, max31725_celsius_to_fahrenheit(temperature)); max31725_write_trip_high_tos(64.0625f, i2cBus); temperature = max31725_read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP, i2cBus); printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, max31725_celsius_to_fahrenheit(temperature)); #endif printf("\r\n"); for (i = 0; i < 8; i++) { /* Configure for one shot, time out disabled, extended format, fault filter 4, active low polarity, comparator mode, shutdown */ max31725_write_cfg_reg(uint8_t(MAX31725_CFG_ONE_SHOT_START | MAX31725_CFG_TIMEOUT_DISABLE | MAX31725_CFG_EXTENDED_FORMAT | MAX31725_CFG_FAULT_FILTER_4 | MAX31725_CFG_OS_POLARITY_ACT_LOW | MAX31725_CFG_COMPARATOR_MODE | MAX31725_CFG_SHUTDOWN), i2cBus); wait(MAX31725_WAIT_CONV_TIME); temperature = max31725_read_reg_as_temperature(MAX31725_REG_TEMPERATURE, i2cBus); printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, temp_sensor.celsius_to_fahrenheit(temperature)); wait(2); /* leave it in shutdown mode for a while */ } max31725_read_cfg_reg(&cfg, i2cBus); printf("Configuration Register = 0x%02Xh \r\n", cfg); #if 0 max31725_write_trip_low_thyst(-55, i2cBus); temperature = max31725_read_reg_as_temperature(MAX31725_REG_THYST_LOW_TRIP, i2cBus); printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, max31725_celsius_to_fahrenheit(temperature)); max31725_write_trip_high_tos(125.0f, i2cBus); temperature = max31725_read_reg_as_temperature(MAX31725_REG_TOS_HIGH_TRIP, i2cBus); printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", temperature, max31725_celsius_to_fahrenheit(temperature)); #endif printf("\r\n\r\n\r\n"); while (true) { // Blink the green LED gLED = !gLED; wait(0.5); } }