C++ driver software code for Maxim Integrated MAX31723/MAX31722 device temperature sensor. The MAX31723 provides 9 to 12 bits of resolution.
Dependents: MAX31723_Thermostat_Thermometer_Sensor
max31723.cpp
- Committer:
- phonemacro
- Date:
- 2019-01-27
- Revision:
- 2:7a20e65da621
- Parent:
- 1:bb6f11be119f
- Child:
- 3:f39791139435
File content as of revision 2:7a20e65da621:
/******************************************************************************* * 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 "max31723.h" MAX31723::MAX31723(SPI &spi, DigitalOut &ce_pin) : m_spi(spi), m_chip_enable(ce_pin) { m_chip_enable = 0; } int MAX31723::write_reg(uint8_t val, uint8_t reg) { m_chip_enable = 1; m_spi.write(reg); m_spi.write(val); m_chip_enable = 0; return MAX31723_NO_ERROR; } int MAX31723::read_reg(uint8_t &val, uint8_t reg) { m_chip_enable = 1; m_spi.write(reg); val = m_spi.write(0); m_chip_enable = 0; return MAX31723_NO_ERROR; } int MAX31723::perform_one_shot_int(uint8_t resolution) { if (resolution <= MAX31723_CFG_RESOLUTION_12BIT) { write_reg(0, MAX31723_REG_CFG | MAX31723_WRITE_MASK); write_reg(MAX31723_CFG_TM_MODE_INTERRUPT | MAX31723_CFG_1SHOT | resolution | MAX31723_CFG_STANDBY, MAX31723_REG_CFG | MAX31723_WRITE_MASK); } else return MAX31723_ERROR; return MAX31723_NO_ERROR; } float MAX31723::read_temp() { uint8_t lsb, msb; uint16_t raw_temp; float temperature; wait(0.2); read_reg(lsb, MAX31723_REG_TEMP_LSB); read_reg(msb, MAX31723_REG_TEMP_MSB); raw_temp = int16_t((msb << 8) | (lsb)); raw_temp = raw_temp >> 4; temperature = raw_temp * 0.0625 ; return temperature; } float MAX31723::celsius_to_fahrenheit(float temp_c) { float temp_f; temp_f = ((temp_c * 9)/5) + 32; return temp_f; } MAX31723::~MAX31723(void) { //empty block }