Diff: max31723.cpp

Revision:

0:4a3d6ac5042d

Child:

1:bb6f11be119f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max31723.cpp	Sat Jan 26 23:55:38 2019 +0000
@@ -0,0 +1,97 @@
+/*******************************************************************************
+* 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
+}
+