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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@0:77036686489d, 2019-02-03 (annotated)
- Committer:
- phonemacro
- Date:
- Sun Feb 03 23:56:45 2019 +0000
- Revision:
- 0:77036686489d
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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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 | 0:77036686489d | 36 | #include "USBSerial.h" |
phonemacro | 0:77036686489d | 37 | |
phonemacro | 0:77036686489d | 38 | MAX32630FTHR pegasus(MAX32630FTHR::VIO_1V8); |
phonemacro | 0:77036686489d | 39 | |
phonemacro | 0:77036686489d | 40 | DigitalOut rLED(LED1); |
phonemacro | 0:77036686489d | 41 | DigitalOut gLED(LED2); |
phonemacro | 0:77036686489d | 42 | DigitalOut bLED(LED3); |
phonemacro | 0:77036686489d | 43 | |
phonemacro | 0:77036686489d | 44 | I2C i2cBus(P3_4, P3_5); |
phonemacro | 0:77036686489d | 45 | |
phonemacro | 0:77036686489d | 46 | // main() runs in its own thread in the OS |
phonemacro | 0:77036686489d | 47 | // (note the calls to Thread::wait below for delays) |
phonemacro | 0:77036686489d | 48 | /** |
phonemacro | 0:77036686489d | 49 | * @brief Sample main program for MAX31875 |
phonemacro | 0:77036686489d | 50 | * @version 1.0000.0000 |
phonemacro | 0:77036686489d | 51 | * |
phonemacro | 0:77036686489d | 52 | * @details Sample main program for MAX31875 |
phonemacro | 0:77036686489d | 53 | * The prints are sent to the terminal window (9600, 8n1). |
phonemacro | 0:77036686489d | 54 | * The program sets the GPIOs to 1.8V and the program |
phonemacro | 0:77036686489d | 55 | * configures the chip and reads temperatures. |
phonemacro | 0:77036686489d | 56 | * To run the program, drag and drop the .bin file into the |
phonemacro | 0:77036686489d | 57 | * DAPLINK folder. After it finishes flashing, cycle the power or |
phonemacro | 0:77036686489d | 58 | * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on |
phonemacro | 0:77036686489d | 59 | * the Pegasus next to the battery connector or the button |
phonemacro | 0:77036686489d | 60 | * on the MAXREFDES100HDK. |
phonemacro | 0:77036686489d | 61 | */ |
phonemacro | 0:77036686489d | 62 | int main() |
phonemacro | 0:77036686489d | 63 | { |
phonemacro | 0:77036686489d | 64 | uint32_t i; |
phonemacro | 0:77036686489d | 65 | float temperature; |
phonemacro | 0:77036686489d | 66 | uint16_t cfg; |
phonemacro | 0:77036686489d | 67 | DigitalOut rLED(LED1, LED_OFF); |
phonemacro | 0:77036686489d | 68 | DigitalOut gLED(LED2, LED_OFF); |
phonemacro | 0:77036686489d | 69 | DigitalOut bLED(LED3, LED_OFF); |
phonemacro | 0:77036686489d | 70 | gLED = LED_ON; |
phonemacro | 0:77036686489d | 71 | printf("MAX31875 Small Package Temperature Sensor example source code.\r\n"); |
phonemacro | 0:77036686489d | 72 | printf("\r\n"); |
phonemacro | 0:77036686489d | 73 | |
phonemacro | 0:77036686489d | 74 | MAX31875 temp_sensor(i2cBus, MAX31875_I2C_SLAVE_ADR_R0); |
phonemacro | 0:77036686489d | 75 | i2cBus.frequency(1000000); |
phonemacro | 0:77036686489d | 76 | |
phonemacro | 0:77036686489d | 77 | /* Configure for fault filter 1, comparator, continuous, |
phonemacro | 0:77036686489d | 78 | * normal format, 8 sps, 12 bit resolution |
phonemacro | 0:77036686489d | 79 | */ |
phonemacro | 0:77036686489d | 80 | temp_sensor.write_cfg(uint16_t(MAX31875_CFG_FAULT_FILTER_1 | |
phonemacro | 0:77036686489d | 81 | MAX31875_CFG_COMPARATOR_MODE | MAX31875_CFG_CONTINUOUS | |
phonemacro | 0:77036686489d | 82 | MAX31875_CFG_NORMAL_FORMAT | MAX31875_CFG_CONV_RATE_8 | |
phonemacro | 0:77036686489d | 83 | MAX31875_CFG_RESOLUTION_12BIT)); |
phonemacro | 0:77036686489d | 84 | for (i = 0; i < 10; i++) { |
phonemacro | 0:77036686489d | 85 | wait(MAX31875_WAIT_CONV_RATE_8); |
phonemacro | 0:77036686489d | 86 | temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE); |
phonemacro | 0:77036686489d | 87 | printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", |
phonemacro | 0:77036686489d | 88 | temperature, temp_sensor.celsius_to_fahrenheit(temperature)); |
phonemacro | 0:77036686489d | 89 | } |
phonemacro | 0:77036686489d | 90 | temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION); |
phonemacro | 0:77036686489d | 91 | printf("Configuration Register = 0x%04Xh \r\n", cfg); |
phonemacro | 0:77036686489d | 92 | |
phonemacro | 0:77036686489d | 93 | printf("\r\n"); |
phonemacro | 0:77036686489d | 94 | |
phonemacro | 0:77036686489d | 95 | |
phonemacro | 0:77036686489d | 96 | /* Configure for fault filter 4, interrupt, shutdown, |
phonemacro | 0:77036686489d | 97 | * extended format, 0.25 sps, 10 bit resolution, start one-shot |
phonemacro | 0:77036686489d | 98 | */ |
phonemacro | 0:77036686489d | 99 | for (i = 0; i < 5; i++) { |
phonemacro | 0:77036686489d | 100 | temp_sensor.write_cfg(uint16_t(MAX31875_CFG_FAULT_FILTER_4 | |
phonemacro | 0:77036686489d | 101 | MAX31875_CFG_INTERRUPT_MODE | MAX31875_CFG_SHUTDOWN | |
phonemacro | 0:77036686489d | 102 | MAX31875_CFG_EXTENDED_FORMAT| MAX31875_CFG_CONV_RATE_0_25 | |
phonemacro | 0:77036686489d | 103 | MAX31875_CFG_RESOLUTION_10BIT | MAX31875_CFG_ONE_SHOT_START)); |
phonemacro | 0:77036686489d | 104 | wait(MAX31875_WAIT_CONV_RATE_0_25); |
phonemacro | 0:77036686489d | 105 | temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE); |
phonemacro | 0:77036686489d | 106 | printf("Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", |
phonemacro | 0:77036686489d | 107 | temperature, temp_sensor.celsius_to_fahrenheit(temperature)); |
phonemacro | 0:77036686489d | 108 | } |
phonemacro | 0:77036686489d | 109 | temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION); |
phonemacro | 0:77036686489d | 110 | printf("Configuration Register = 0x%04Xh \r\n", cfg); |
phonemacro | 0:77036686489d | 111 | |
phonemacro | 0:77036686489d | 112 | printf("\r\n\r\n"); |
phonemacro | 0:77036686489d | 113 | #if 0 |
phonemacro | 0:77036686489d | 114 | temp_sensor.write_trip_low(3.0625f); |
phonemacro | 0:77036686489d | 115 | temp_sensor.read_reg(&cfg, MAX31875_REG_CONFIGURATION); |
phonemacro | 0:77036686489d | 116 | temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_THYST); |
phonemacro | 0:77036686489d | 117 | printf("Thyst Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", |
phonemacro | 0:77036686489d | 118 | temperature, temp_sensor.celsius_to_fahrenheit(temperature)); |
phonemacro | 0:77036686489d | 119 | |
phonemacro | 0:77036686489d | 120 | temp_sensor.write_trip_high(129.0625f); |
phonemacro | 0:77036686489d | 121 | temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TOS); |
phonemacro | 0:77036686489d | 122 | printf("TOS Temperature = %3.4f Celsius, %3.4f Fahrenheit\r\n", |
phonemacro | 0:77036686489d | 123 | temperature, temp_sensor.celsius_to_fahrenheit(temperature)); |
phonemacro | 0:77036686489d | 124 | printf("\r\n\r\n"); |
phonemacro | 0:77036686489d | 125 | #endif |
phonemacro | 0:77036686489d | 126 | while (true) { // Blink the green LED |
phonemacro | 0:77036686489d | 127 | gLED = !gLED; |
phonemacro | 0:77036686489d | 128 | wait(0.5); |
phonemacro | 0:77036686489d | 129 | } |
phonemacro | 0:77036686489d | 130 | } |
phonemacro | 0:77036686489d | 131 | |
phonemacro | 0:77036686489d | 132 |