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, thermostat and over-temperature monitoring.
Dependencies: MAX31725_Accurate_Temperature_Sensor max32630fthr USBDevice
Diff: main.cpp
- Revision:
- 0:08830daf46a0
- Child:
- 1:5d32aeb8387e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Tue Apr 09 07:13:23 2019 +0000 @@ -0,0 +1,227 @@ +/******************************************************************************* +* 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); + } +} + + \ No newline at end of file