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* @file          MAX30208.cpp
* @brief         This is the C++ file used for the MAX30208 human body temperature sensor library.
* @version       1.0
* @notes         This file needs to be imported along with MAX30208.h for the program to work properly. This is library containing basic functions to be used in conjunction with the MAX30208. This library does not support any other devices. This is an MBed tested library. 
*****************************************************************************/
 
 
#include "MAX30208.h"


//******************************************************************************
MAX30208::MAX30208(I2C &i2c, uint8_t slaveAddress): 
m_i2c(i2c), m_writeAddress(slaveAddress << 1), 
m_readAddress((slaveAddress << 1) | 1)
{
}


//******************************************************************************
MAX30208::~MAX30208(void) {
  //empty block
}

//******************************************************************************
    int32_t MAX30208::writeInterruptRegister(Configuration_InterruptEnable config) {
        return(writeRegister(MAX30208::Interrupt_Enable,(config.all << 8),2));
    }
    
//******************************************************************************
    int32_t MAX30208::readInterruptRegister(Configuration_InterruptEnable &config) {
        uint16_t data;
        int32_t status;
        status = readRegister(MAX30208::Interrupt_Enable, data, 1);
        if(status == 0) {
            config.all = data;
        }
        return(status);
    }

//****************************************************************************** 
    int32_t MAX30208::readStatus(uint16_t &value) {
        return(readRegister(MAX30208::Status,value, 1));
    }
    
//******************************************************************************
    int32_t MAX30208::readWritePointer(uint16_t &value) {
        return (readRegister(MAX30208::FIFO_Write_Pointer,value, 1));
    }
    
//******************************************************************************
    int32_t MAX30208::readReadPointer(uint16_t &value) {
        return (readRegister(MAX30208::FIFO_Read_Pointer,value,1));
    }
    
//******************************************************************************
    int32_t MAX30208::writeReadPointer(uint8_t config) {
        return(writeRegister(MAX30208::FIFO_Read_Pointer, (config << 8),2));
    }
    
//******************************************************************************
    int32_t MAX30208::readOverflow(uint16_t &value) {
        return(readRegister(MAX30208::FIFO_Overflow_Counter,value, 1));
    }
    
//******************************************************************************
    int32_t MAX30208::readDataCounter(uint16_t &value) {
        return(readRegister(MAX30208::FIFO_Data_Counter,value, 1));  
    }
    
//******************************************************************************
   int32_t MAX30208::readData(uint16_t &value) {
        return(readRegister(MAX30208::FIFO_Data,value, 2));
    }
    
//******************************************************************************
   int32_t MAX30208::takeDataMeasurment() {
        return(writeRegister(MAX30208::Temp_Sensor_Setup,0xFF00,2));
    }
    
//******************************************************************************
    int32_t MAX30208::readFIFOConfig1(uint16_t &value) {
        return (readRegister(MAX30208::FIFO_Config1,value, 1));
    }
    
//******************************************************************************
    int32_t MAX30208::writeFIFOConfig1(uint8_t config) { 
        return(writeRegister(MAX30208::FIFO_Config1,(config << 8),2));
    }
    
//******************************************************************************
    int32_t MAX30208::readFIFOConfig2(Configuration_FIFOConfig2 &config) {
        uint16_t data;
        int32_t status;
        status = readRegister(MAX30208::FIFO_Config2, data, 1);
        if(status == 0){
            config.all = data;
        }
        return(status);
    }
    
//******************************************************************************
    int32_t MAX30208::writeFIFOConfig2(Configuration_FIFOConfig2 config) {
        return(writeRegister(MAX30208::FIFO_Config2,(config.all << 8),2));
    }
    
//******************************************************************************
    int32_t MAX30208::resetDevice() {
        return(writeRegister(MAX30208::System_Control,(0x01 << 8),2));
    }

//******************************************************************************
   int32_t MAX30208::readAlarmHigh(uint16_t &temp) {
        return readRegister(MAX30208::Alarm_High_MSB,temp, 2);
    }
       
//******************************************************************************
    int32_t MAX30208::writeAlarmHigh(uint16_t temp) {
        return(writeRegister(MAX30208::Alarm_High_MSB, temp, 3));
    }
    
//******************************************************************************
    int32_t MAX30208::readAlarmLow(uint16_t &value) {
        return (readRegister(MAX30208::Alarm_Low_MSB,value, 2));
    }
    
//******************************************************************************
   int32_t MAX30208::writeAlarmLow(uint16_t temp) {
        return(writeRegister(MAX30208::Alarm_Low_MSB,temp,3));
    }
    
//******************************************************************************
    int32_t MAX30208::readGPIOSetup(Configuration_GPIOSetup &config) {
        uint16_t data;
        int32_t status;
        status = readRegister(MAX30208::GPIO_Setup, data, 1);
        if(status == 0) {
            config.all = data;
        }
        return(status);
    }

//******************************************************************************
    int32_t MAX30208::writeGPIOSetup(Configuration_GPIOSetup config) {
        return(writeRegister(MAX30208::GPIO_Setup,(config.all << 8),2));
    }
    
//******************************************************************************
    int32_t MAX30208::readGPIOControl(Configuration_GPIOControl &config) {
        uint16_t data;
        int32_t status;
        status = readRegister(MAX30208::GPIO_Control, data, 1);
        if(status == 0) {
            config.all = data;
        }
        return(status);
    }

//******************************************************************************
    int32_t MAX30208::writeGPIOControl(Configuration_GPIOControl config) {
        return(writeRegister(MAX30208::GPIO_Control,(config.all << 8),2));
    }
    
//******************************************************************************
    float MAX30208::toCelsius(uint16_t rawTemp) {
        float celsius;
        celsius = 0.005*rawTemp;
        return celsius;    
    }
    
//******************************************************************************
    float MAX30208::toFahrenheit(float temperatureC) {
         float temperatureF;
         temperatureF = (temperatureC * 1.8F) + 32.0f;
         return temperatureF;   
    }
    
//******************************************************************************
int32_t MAX30208::writeRegister(Registers_e reg, uint16_t value, int bytesWritten) {
  
  int32_t ret;
  
  uint8_t hi = ((value >> 8) & 0xFF);
  uint8_t lo = (value & 0xFF);
  char val[3] = {reg, hi, lo};
  
  ret = m_i2c.write(m_writeAddress, val, bytesWritten, false); 
  return (ret);
}

//******************************************************************************
int32_t MAX30208::readRegister(Registers_e reg, uint16_t &value, int bytesRead) {
    
    int32_t ret;
    char cmdata[1] = {reg};
    char dataRead[2];
        
    ret = m_i2c.write(m_readAddress,cmdata,1,true);
    if (ret == 0) {
        ret = m_i2c.read(m_readAddress,dataRead,bytesRead,false);
        if(ret == 0 && bytesRead == 2){
            value = ((dataRead[0]<<8)+ dataRead[1]);
        }
        else if (ret == 0 && bytesRead == 1){
            value = dataRead[0];    
        }
    }
    return(ret);
}