dht11.h

/* ****************************************************************************
   *                                                                          *
   * Name    : DHT11 Temperature and humidity digital sensor                  *
   *            (cheap version of Sensirion SHT11)                            *
   * Author  : saper_2 / nolin11                                              *
   *                                                                          *
   *  Checkout dht11.c for complete author & license inforamtion about this   *
   *                                                                          *
   **************************************************************************** */

#ifndef _DHT11_DRIVER_H_
#define _DHT11_DRIVER_H_

struct DHT11_DATA {
    uint8_t rh; // integral part of RH
    uint8_t rhd; // decimal part of RH
    uint8_t temp; // integral part of temperature
    uint8_t tempd; // decimal part of temperature
    uint8_t csm; // checksum
};

// data line need a pull-up (4-10k - 5k1 is recomended)
#define DHT_PORT PORTD
#define DHT_PIN PIND
#define DHT_DDR DDRD
#define DHT_PN 3

#define DHT_DATA_INT_SOURCE_NOT_USED 0
#define DHT_DATA_INT_SOURCE_INT0 0
#define DHT_DATA_INT_SOURCE_INT1 1

#define DHT_DATA_INT_SOURCE DHT_DATA_INT_SOURCE_NOT_USED


#define dht_data_in DHT_DDR &= ~(1<<DHT_PN);
#define dht_data_out DHT_DDR |= (1<<DHT_PN);
#define dht_data_hi DHT_PORT |= 1<<DHT_PN; dht_data_in;
#define dht_data_lo DHT_PORT &= ~(1<<DHT_PN); dht_data_out;
#define dht_get_data ((DHT_PIN & (1<<DHT_PN)) == (1<<DHT_PN))

// init ports, interrupts, etc...
void dht11_init(void);

#define DHT11_READ_OK 0
#define DHT11_READ_ERROR_CSM 1
#define DHT11_READ_ERROR_START 2
#define DHT11_READ_ERROR_ACK 3
#define DHT11_READ_ERROR_ACK2 4
#define DHT11_READ_ERROR_TIME 5
#define DHT11_READ_ERROR_TIME2 6

uint8_t dht11_read(uint8_t* data);
//uint8_t dht11_read(void);




#endif