Camilo Ruiz / tmp112

Interface with TMP112 and TMP102 temperature sensor

Dependents:   tmp112HelloWorld

TMP112.cpp@0:2fbb524f0609, 2016-05-12 (annotated)

Committer:
CamiloRuiz
Date:
Thu May 12 21:49:05 2016 +0000
Revision:
0:2fbb524f0609
First working version.; ; extended mode, negative values and oneshot mode are not supported yet.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CamiloRuiz 0:2fbb524f0609 1 /*
CamiloRuiz 0:2fbb524f0609 2 Copyright (c) 2016 Camilo Ruiz
CamiloRuiz 0:2fbb524f0609 3
CamiloRuiz 0:2fbb524f0609 4 Permission is hereby granted, free of charge, to any person obtaining a copy
CamiloRuiz 0:2fbb524f0609 5 of this software and associated documentation files (the "Software"), to deal
CamiloRuiz 0:2fbb524f0609 6 in the Software without restriction, including without limitation the rights
CamiloRuiz 0:2fbb524f0609 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
CamiloRuiz 0:2fbb524f0609 8 copies of the Software, and to permit persons to whom the Software is
CamiloRuiz 0:2fbb524f0609 9 furnished to do so, subject to the following conditions:
CamiloRuiz 0:2fbb524f0609 10
CamiloRuiz 0:2fbb524f0609 11 The above copyright notice and this permission notice shall be included in
CamiloRuiz 0:2fbb524f0609 12 all copies or substantial portions of the Software.
CamiloRuiz 0:2fbb524f0609 13
CamiloRuiz 0:2fbb524f0609 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
CamiloRuiz 0:2fbb524f0609 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
CamiloRuiz 0:2fbb524f0609 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
CamiloRuiz 0:2fbb524f0609 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
CamiloRuiz 0:2fbb524f0609 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
CamiloRuiz 0:2fbb524f0609 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
CamiloRuiz 0:2fbb524f0609 20 THE SOFTWARE.
CamiloRuiz 0:2fbb524f0609 21 */
CamiloRuiz 0:2fbb524f0609 22
CamiloRuiz 0:2fbb524f0609 23 //this should work with tmp102 too
CamiloRuiz 0:2fbb524f0609 24 //I do not use negative values on my application, this code has to be tweaked to support it
CamiloRuiz 0:2fbb524f0609 25 //I do not use extended mode, this code has to be tweaked to support it
CamiloRuiz 0:2fbb524f0609 26
CamiloRuiz 0:2fbb524f0609 27 //greetings from Colombia :)
CamiloRuiz 0:2fbb524f0609 28
CamiloRuiz 0:2fbb524f0609 29 #include "TMP112.h"
CamiloRuiz 0:2fbb524f0609 30
CamiloRuiz 0:2fbb524f0609 31 #define TEMP_REG_ADDR 0x00
CamiloRuiz 0:2fbb524f0609 32
CamiloRuiz 0:2fbb524f0609 33 TMP112::TMP112(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
CamiloRuiz 0:2fbb524f0609 34 {
CamiloRuiz 0:2fbb524f0609 35 extended_mode=0; //default, extended mode off
CamiloRuiz 0:2fbb524f0609 36 }
CamiloRuiz 0:2fbb524f0609 37
CamiloRuiz 0:2fbb524f0609 38 TMP112::~TMP112()
CamiloRuiz 0:2fbb524f0609 39 {
CamiloRuiz 0:2fbb524f0609 40 }
CamiloRuiz 0:2fbb524f0609 41
CamiloRuiz 0:2fbb524f0609 42
CamiloRuiz 0:2fbb524f0609 43 /** TMP112 read one of the three available temperature registers
CamiloRuiz 0:2fbb524f0609 44 * return in celsius
CamiloRuiz 0:2fbb524f0609 45 */
CamiloRuiz 0:2fbb524f0609 46 float TMP112::readTmpReg(char reg)
CamiloRuiz 0:2fbb524f0609 47 {
CamiloRuiz 0:2fbb524f0609 48 m_i2c.write(m_addr, &reg, 1); //Pointer to the temperature register
CamiloRuiz 0:2fbb524f0609 49 char data[2] = {0,0};
CamiloRuiz 0:2fbb524f0609 50 m_i2c.read(m_addr, data, 2); //Read
CamiloRuiz 0:2fbb524f0609 51 int16_t res = ((int8_t)data[0] << 4) | ((uint8_t)data[1] >> 4);
CamiloRuiz 0:2fbb524f0609 52 float temp = (float) ((float)res * 0.0625);
CamiloRuiz 0:2fbb524f0609 53 return temp;
CamiloRuiz 0:2fbb524f0609 54 }
CamiloRuiz 0:2fbb524f0609 55
CamiloRuiz 0:2fbb524f0609 56 /** TMP112 get the actual temperature of the sensor
CamiloRuiz 0:2fbb524f0609 57 */
CamiloRuiz 0:2fbb524f0609 58 float TMP112::readTemperature()
CamiloRuiz 0:2fbb524f0609 59 {
CamiloRuiz 0:2fbb524f0609 60 return readTmpReg(0);
CamiloRuiz 0:2fbb524f0609 61 }
CamiloRuiz 0:2fbb524f0609 62
CamiloRuiz 0:2fbb524f0609 63 /** TMP112 read the hi temp of the thermostat stored in the sensor
CamiloRuiz 0:2fbb524f0609 64 */
CamiloRuiz 0:2fbb524f0609 65 float TMP112::readTM_Htemp()
CamiloRuiz 0:2fbb524f0609 66 {
CamiloRuiz 0:2fbb524f0609 67 return readTmpReg(3);
CamiloRuiz 0:2fbb524f0609 68 }
CamiloRuiz 0:2fbb524f0609 69
CamiloRuiz 0:2fbb524f0609 70 /** TMP112 read the low temp of the thermostat stored in the sensor
CamiloRuiz 0:2fbb524f0609 71 */
CamiloRuiz 0:2fbb524f0609 72 float TMP112::readTM_Ltemp()
CamiloRuiz 0:2fbb524f0609 73 {
CamiloRuiz 0:2fbb524f0609 74 return readTmpReg(2);
CamiloRuiz 0:2fbb524f0609 75 }
CamiloRuiz 0:2fbb524f0609 76
CamiloRuiz 0:2fbb524f0609 77 /** TMP112 read the cfg register
CamiloRuiz 0:2fbb524f0609 78 */
CamiloRuiz 0:2fbb524f0609 79 uint16_t TMP112::readCFG()
CamiloRuiz 0:2fbb524f0609 80 {
CamiloRuiz 0:2fbb524f0609 81 char reg=1;
CamiloRuiz 0:2fbb524f0609 82 m_i2c.write(m_addr, &reg, 1); //Pointer to the cfg register
CamiloRuiz 0:2fbb524f0609 83 char data[2] = {0,0};
CamiloRuiz 0:2fbb524f0609 84 m_i2c.read(m_addr, data, 2); //Read
CamiloRuiz 0:2fbb524f0609 85 return (data[0] << 8) | data[1];
CamiloRuiz 0:2fbb524f0609 86 }
CamiloRuiz 0:2fbb524f0609 87
CamiloRuiz 0:2fbb524f0609 88 /** TMP112 write the cfg register
CamiloRuiz 0:2fbb524f0609 89 */
CamiloRuiz 0:2fbb524f0609 90 void TMP112::writeCFG(uint16_t cfg)
CamiloRuiz 0:2fbb524f0609 91 {
CamiloRuiz 0:2fbb524f0609 92 //char reg=1;
CamiloRuiz 0:2fbb524f0609 93 //m_i2c.write(m_addr, &reg, 1); //Pointer to the cfg register
CamiloRuiz 0:2fbb524f0609 94 char data[3];
CamiloRuiz 0:2fbb524f0609 95 data[0]=1; //Pointer to the cfg register
CamiloRuiz 0:2fbb524f0609 96 data[1]=cfg>>8;
CamiloRuiz 0:2fbb524f0609 97 data[2]=cfg & 0xFF;
CamiloRuiz 0:2fbb524f0609 98 m_i2c.write(m_addr, data, 3); //write
CamiloRuiz 0:2fbb524f0609 99 }
CamiloRuiz 0:2fbb524f0609 100 /** TMP112 write a threshold temp o thermostat into the sensor
CamiloRuiz 0:2fbb524f0609 101 */
CamiloRuiz 0:2fbb524f0609 102 void TMP112::writeTmpReg(char reg, float temp){
CamiloRuiz 0:2fbb524f0609 103 uint16_t regValue= (uint16_t) (temp/0.0625);
CamiloRuiz 0:2fbb524f0609 104 char data[3];
CamiloRuiz 0:2fbb524f0609 105 data[0]=reg; //Pointer to the cfg register
CamiloRuiz 0:2fbb524f0609 106 data[1]=(regValue>>4)& 0xFF;
CamiloRuiz 0:2fbb524f0609 107 data[2]=(regValue << 4) & 0xFF;
CamiloRuiz 0:2fbb524f0609 108 m_i2c.write(m_addr, data, 3); //write
CamiloRuiz 0:2fbb524f0609 109 }
CamiloRuiz 0:2fbb524f0609 110
CamiloRuiz 0:2fbb524f0609 111 //write thermostat temperatures high
CamiloRuiz 0:2fbb524f0609 112 void TMP112::write_TM_Htemp(float temp){
CamiloRuiz 0:2fbb524f0609 113 writeTmpReg(3,temp);
CamiloRuiz 0:2fbb524f0609 114 }
CamiloRuiz 0:2fbb524f0609 115 //write thermostat temperatures low
CamiloRuiz 0:2fbb524f0609 116 void TMP112::write_TM_Ltemp(float temp){
CamiloRuiz 0:2fbb524f0609 117 writeTmpReg(2,temp);
CamiloRuiz 0:2fbb524f0609 118 }
CamiloRuiz 0:2fbb524f0609 119