MAX30205.cpp

00001 /*******************************************************************************
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00033  
00034  
00035 #include "MAX30205.h"
00036 
00037 
00038 //******************************************************************************
00039 MAX30205::MAX30205(I2C &i2c, uint8_t slaveAddress): 
00040 m_i2c(i2c), m_address(slaveAddress)
00041 {
00042 }
00043 
00044 
00045 //******************************************************************************
00046 MAX30205::~MAX30205(void) 
00047 {
00048   //empty block
00049 }
00050 
00051 
00052 //******************************************************************************
00053 int32_t MAX30205::readTemperature(uint16_t &value) 
00054 {
00055   return readRegister(MAX30205::Temperature, value);
00056 }
00057 
00058 
00059 //******************************************************************************
00060 int32_t MAX30205::readConfiguration(Configuration_u &config)
00061 {
00062     uint16_t data;
00063     
00064     int32_t result = readRegister(MAX30205::Configuration, data);
00065     if(result == 0)
00066     {
00067         config.all = (0x00FF & data);
00068     }
00069     
00070     return result;
00071     
00072 }
00073 
00074 
00075 //******************************************************************************    
00076 int32_t MAX30205::writeConfiguration(const Configuration_u config)
00077 {
00078     uint16_t local_config = (0x00FF & config.all);
00079     
00080     return writeRegister(MAX30205::Configuration, local_config);
00081 }
00082 
00083 
00084 //******************************************************************************
00085 int32_t MAX30205::readTHYST(uint16_t &value) 
00086 {
00087   return readRegister(MAX30205::THYST, value);
00088 }
00089 
00090 
00091 //******************************************************************************
00092 int32_t MAX30205::writeTHYST(uint16_t value) 
00093 {
00094   return writeRegister(MAX30205::THYST, value);
00095 }
00096 
00097 
00098 //******************************************************************************
00099 int32_t MAX30205::readTOS(uint16_t &value)
00100 {
00101     return readRegister(MAX30205::TOS, value);
00102 }
00103 
00104 
00105 //******************************************************************************
00106 int32_t MAX30205::writeTOS(const uint16_t value)
00107 {
00108     return writeRegister(MAX30205::TOS, value);
00109 }
00110 
00111 
00112 //******************************************************************************
00113 float MAX30205::toCelsius(uint32_t rawTemp) 
00114 {
00115   uint8_t val1, val2;
00116   float result;
00117   
00118   val1 = (rawTemp >> 8);
00119   val2 = (rawTemp & 0xFF);
00120   
00121   result = static_cast<float>(val1 + (val2/ 256.0F));
00122   
00123   return result;
00124 }
00125 
00126 
00127 //******************************************************************************
00128 float MAX30205::toFahrenheit(float temperatureC) 
00129 {
00130   return((temperatureC * 1.8F) + 32.0f);
00131 }
00132 
00133 
00134 //******************************************************************************
00135 int32_t MAX30205::writeRegister(Registers_e reg, uint16_t value) 
00136 {
00137   int32_t result;
00138   
00139   uint8_t hi = ((value >> 8) & 0xFF);
00140   uint8_t lo = (value & 0xFF);
00141   char cmdData[3] = {reg, hi, lo};
00142   
00143   result = m_i2c.write(m_address, cmdData, 3);
00144   
00145   return result;
00146 }
00147 
00148 
00149 //******************************************************************************
00150 int32_t MAX30205::readRegister(Registers_e reg, uint16_t &value) 
00151 {
00152   int32_t result;
00153   
00154   char data[2];
00155   char cmdData[1] = {reg};
00156   
00157   result = m_i2c.write(m_address, cmdData, 1);
00158   if(result == 0)
00159   {
00160       result = m_i2c.read(m_address, data, 2);
00161       if (result == 0)
00162       {
00163           value = (data[0] << 8) + data[1];
00164       }
00165   }
00166   
00167   return result;
00168 }