TMP102.cpp

00001 
00002 /*
00003 Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
00004  
00005 Permission is hereby granted, free of charge, to any person obtaining a copy
00006 of this software and associated documentation files (the "Software"), to deal
00007 in the Software without restriction, including without limitation the rights
00008 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00009 copies of the Software, and to permit persons to whom the Software is
00010 furnished to do so, subject to the following conditions:
00011  
00012 The above copyright notice and this permission notice shall be included in
00013 all copies or substantial portions of the Software.
00014  
00015 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00016 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00017 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00018 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00019 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00020 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00021 THE SOFTWARE.
00022 */
00023 
00024 #include "TMP102.h"
00025 
00026 #define TEMP_REG_ADDR 0x00
00027 
00028 TMP102::TMP102(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
00029 {
00030 
00031 }
00032 
00033 TMP102::~TMP102 ()
00034 {
00035 
00036 }
00037 
00038 float TMP102::read()
00039 {
00040   
00041   const char tempRegAddr = TEMP_REG_ADDR;
00042 
00043   m_i2c.write(m_addr, &tempRegAddr, 1); //Pointer to the temperature register
00044  
00045   char reg[2] = {0,0};
00046   m_i2c.read(m_addr, reg, 2); //Rea
00047   
00048   int16_t res  = ((int8_t)reg[0] << 4) | ((uint8_t)reg[1] >> 4);  
00049   
00050   float temp =  (float) ((float)res * 0.0625);
00051    
00052   return temp;
00053 }