/*
    FILE:       idDHT11.h
    VERSION:    0.1
    PURPOSE:    Interrupt driven Lib for DHT11 with Arduino.
    LICENCE:    GPL v3 (http://www.gnu.org/licenses/gpl.html)
    DATASHEET: http://www.micro4you.com/files/sensor/DHT11.pdf

    Based on DHT11 library: http://playground.arduino.cc/Main/DHT11Lib
*/


#ifndef idDHT11_H__
#define idDHT11_H__

#if defined(ARDUINO) && (ARDUINO >= 100)
#include <Arduino.h>
#else
#include <WProgram.h>
#endif

#define IDDHT11LIB_VERSION "0.1"

// state codes
#define IDDHTLIB_OK         0
#define IDDHTLIB_ACQUIRING      1
#define IDDHTLIB_ACQUIRED       2
#define IDDHTLIB_RESPONSE_OK        3

// error codes
#define IDDHTLIB_ERROR_CHECKSUM     -1
#define IDDHTLIB_ERROR_ISR_TIMEOUT  -2
#define IDDHTLIB_ERROR_RESPONSE_TIMEOUT -3
#define IDDHTLIB_ERROR_DATA_TIMEOUT -4
#define IDDHTLIB_ERROR_ACQUIRING    -5
#define IDDHTLIB_ERROR_DELTA        -6
#define IDDHTLIB_ERROR_NOTSTARTED   -7

#define IDDHT11_CHECK_STATE     if(state == STOPPED)                                                    \
                                    return status;                                                  \
                                else if(state != ACQUIRED)              \
                                    return IDDHTLIB_ERROR_ACQUIRING;

class idDHT11
{
public:
    idDHT11(int pin, int intNumber,void (*isrCallback_wrapper)());
    void init(int pin, int intNumber,void (*isrCallback_wrapper)());
    void isrCallback();
    int acquire();
    int acquireAndWait();
    float getCelsius();
    float getFahrenheit();
    float getKelvin();
    double getDewPoint();
    double getDewPointSlow();
    float getHumidity();
    bool acquiring();
    int getStatus();

private:

    void (*isrCallback_wrapper)(void);

    enum states{RESPONSE=0,DATA=1,ACQUIRED=2,STOPPED=3,ACQUIRING=4};
    volatile states state;
    volatile int status;
    volatile byte bits[5];
    volatile byte cnt;
    volatile byte idx;
    volatile int us;
    int intNumber;
    int pin;
    volatile float hum;
    volatile float temp;
};
#endif // idDHT11_H__