File content as of revision 0:4a3d6ac5042d:

/*******************************************************************************
* 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(uint8_t resolution)
{
    if (resolution <= MAX31723_CFG_RESOLUTION_12BIT)
        write_reg(resolution | MAX31723_CFG_1SHOT | 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;
    
    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
}