//
//    FILE: Cozir.cpp
//  AUTHOR: DirtGambit & Rob Tillaart
// VERSION: 0.1.04
// PURPOSE: library for COZIR range of sensors for Arduino
//          Polling Mode
//     URL: http://forum.arduino.cc/index.php?topic=91467.0
//
// HISTORY:
// 0.1.04 changed CO2 to support larger values (Rob T)
// 0.1.03 added setOperatingMode
// 0.1.02 added support Arduino 1.x
// 0.1.01 initial version
//
// READ DATASHEET BEFORE USE OF THIS LIB !
//
// Released to the public domain
//

#include "Cozir.h"

////////////////////////////////////////////////////////////
//
// CONSTRUCTOR
//
#if defined(ARDUINO) && ARDUINO >= 100
COZIR::COZIR(SoftwareSerial& nss) : CZR_Serial(nss)
#else
COZIR::COZIR(NewSoftSerial& nss) : CZR_Serial(nss)
#endif
{
    nss.begin(9600);
    // overide default streaming (takes too much perf
    SetOperatingMode(CZR_POLLING);
    // delay for initialization
    delay(1200);
}

////////////////////////////////////////////////////////////
//
// OPERATING MODE
//
// note: use CZR_COMMAND to minimize power consumption
// CZR_POLLING and CZR_STREAMING use an equally amount
// of power as both sample continuously...
//
void COZIR::SetOperatingMode(uint8_t mode)
{
    sprintf(buffer, "K %u", mode);
    Command(buffer);
}

////////////////////////////////////////////////////////////
//
// POLLING MODE
//
// you need to set the polling mode explicitely before
// using these functions. SetOperatingMode(CZR_POLLING);
// this is the default behaviour of this Class but
// not of the sensor!!
//
float COZIR::Fahrenheit()
{
    return (Celsius() * 1.8) + 32;
}

float COZIR::Celsius()
{
    uint16_t rv = Request("T");
    float f = 0.1 * (rv - 1000.0);
    return f;
}

float COZIR::Humidity()
{
    return 0.1 * Request("H");
}

// TODO UNITS UNKNOWN
float COZIR::Light()
{
    return 1.0 * Request("L");
}

uint32_t COZIR::CO2()
{
    return Request("Z");
}

// CALLIBRATION - USE THESE WITH CARE
// use these only in pollingmode (on the Arduino)

// FineTuneZeroPoint()
// a reading of v1 will be reported as v2
// sort of mapping
// check datasheet for detailed description
uint16_t COZIR::FineTuneZeroPoint(uint16_t v1, uint16_t v2)
{
    sprintf(buffer, "F %u %u", v1, v2);
    return Request(buffer);
}

// mostly the default calibrator
uint16_t COZIR::CalibrateFreshAir()
{
    return Request("G");
}

uint16_t COZIR::CalibrateNitrogen()
{
    return Request("U");
}

uint16_t COZIR::CalibrateKnownGas(uint16_t value)
{
    sprintf(buffer, "X %u", value);
    return Request(buffer);
}

// NOT RECOMMENDED, see datasheet
uint16_t COZIR::CalibrateManual(uint16_t value)
{
    return 0;
    //sprintf(buffer, "u %u", value);
    //return Request(buffer);
}

// NOT RECOMMENDED, see datasheet
uint16_t COZIR::SetSpanCalibrate(uint16_t value)
{
    return 0;
    //sprintf(buffer, "S %u", value);
    //return Request(buffer);
}

// NOT RECOMMENDED, see datasheet
uint16_t COZIR::GetSpanCalibrate()
{
    return Request("s");
}

// DIGIFILTER, use with care
// default value = 32,
// 1=fast (noisy) 255=slow (smoothed)
// 0 = special. details see datasheet
void COZIR::SetDigiFilter(uint8_t value)
{
    sprintf(buffer, "A %u", value);
    Command(buffer);
}

uint8_t COZIR::GetDigiFilter()
{
    return Request("a");
}

////////////////////////////////////////////////////////////
//
// STREAMING MODE
//
// outputfields should be OR-ed
// e.g. SetOutputFields(CZR_HUMIDITY | CZR_RAWTEMP | CZR_RAWCO2);
//
// you need to set the STREAMING mode explicitely
// SetOperatingMode(CZR_STREAMING);
//
// in STREAMING mode you must parse the output of serial yourself
//
void COZIR::SetOutputFields(uint16_t fields)
{
    sprintf(buffer, "M %u", fields);
    Command(buffer);
}

// For Arduino you must read the serial yourself as
// the internal buffer of this Class cannot handle
// large output - can be > 100 bytes!!
void COZIR::GetRecentFields()
{
    Command("Q");
}

////////////////////////////////////////////////////////////
//
// EEPROM - USE WITH CARE
//
// SEE DATASHEET 7.2 EEPROM FOR DETAILS
//
// TODO
// - defines for addresses
// - do HILO values in one call
//
void COZIR::SetEEPROM(uint8_t address, uint8_t value)
{
    sprintf(buffer, "P %u %u", address, value);
    Command(buffer);
}

uint8_t COZIR::GetEEPROM(uint8_t address)
{
    sprintf(buffer, "p %u", address);
    return Request(buffer);
}

////////////////////////////////////////////////////////////
//
// COMMAND MODE
//
// read serial yourself
//
void COZIR::GetVersionSerial()
{
    Command("Y");
}

void COZIR::GetConfiguration()
{
    Command("*");
}

/////////////////////////////////////////////////////////
// PRIVATE

void COZIR::Command(const char* s)
{
    // TODO
    // CZR_Serial.println(s);
    CZR_Serial.print(s);
    CZR_Serial.print("\r\n");
}

uint32_t COZIR::Request(const char* s)
{
    Command(s);
    // empty buffer
    buffer[0] = '\0';
    // read answer; there may be a 100ms delay!
    // TODO: PROPER TIMEOUT CODE.
    delay(200);
    int idx = 0;
    while(CZR_Serial.available())
    {
        buffer[idx++] = CZR_Serial.read();
    }
    buffer[idx] = '\0';

    uint32_t rv = 0;
    switch(buffer[0])
    {
    case 'T' :
        rv = atoi(&buffer[5]);
        if (buffer[4] == 1) rv += 1000;
        // negative values are mapped above 1000..1250 => capture this in Celsius()
        break;
        default :
        rv = atol(&buffer[2]);
        break;
    }
    return rv;
}
// -- END OF FILE --