dht.h

Go to the documentation of this file.

/*
 * Copyright 2015 Ludwig Knüpfer,
 *           2015 Christian Mehlis
 *           2016-2017 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#ifndef DHT_H
#define DHT_H
 
#include <stdint.h>
 
#include "periph/gpio.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
enum {
    DHT_OK      =  0,       
    DHT_NOCSUM  = -1,       
    DHT_TIMEOUT = -2,       
    DHT_NODEV   = -3        
};
 
typedef struct {
    uint16_t humidity;      
    uint16_t temperature;   
} dht_data_t;
 
typedef enum {
    DHT11,                  
    DHT22,                  
    DHT21 = DHT22           
} dht_type_t;
 
typedef struct {
    gpio_t pin;             
    dht_type_t type;        
    gpio_mode_t in_mode;    
} dht_params_t;
 
typedef struct {
    dht_params_t params;    
    dht_data_t last_val;    
    uint32_t last_read_us;  
} dht_t;
 
int dht_init(dht_t *dev, const dht_params_t *params);
 
int dht_read(dht_t *dev, int16_t *temp, int16_t *hum);
 
#ifdef __cplusplus
}
#endif
 
#endif /* DHT_H */