dht.h
[syntax=c]#ifndef DHT2_H_
#define DHT2_H_
#include <stdio.h>
#include <avr/io.h>
//setup port
#define DHT1_DDR DDRD
#define DHT1_PORT PORTD
#define DHT1_PIN PIND
#define DHT1_INPUTPIN PD5
//sensor type
#define DHT1_DHT11 1
#define DHT1_DHT22 2
#define DHT1_TYPE DHT1_DHT11
//enable decimal precision (float)
#if DHT1_TYPE == DHT1_DHT11
#define DHT1_FLOAT 0
#elif DHT1_TYPE == DHT1_DHT22
#define DHT1_FLOAT 1
#endif
//timeout retries
#define DHT1_TIMEOUT 200
//functions
#if DHT1_FLOAT == 1
extern int8_t dht_gettemperature1(float *temperature1);
extern int8_t dht_gethumidity1(float *humidity1);
extern int8_t dht_gettemperaturehumidity1(float *temperature1, float *humidity1);
#elif DHT1_FLOAT == 0
extern int8_t dht_gettemperature1(int8_t *temperature1);
extern int8_t dht_gethumidity1(int8_t *humidity1);
extern int8_t dht_gettemperaturehumidity1(int8_t *temperature1, int8_t *humidity1);
#endif
#endif[/syntax]
plik dht.c
[syntax=c]#include <stdio.h>
#include <string.h>
#include <avr/io.h>
#include <util/delay.h>
#include "dht2.h"
/*
* get data from sensor
*/
#if DHT1_FLOAT == 1
int8_t dht_getdata1(float *temperature1, float *humidity1) {
#elif DHT1_FLOAT == 0
int8_t dht_getdata1(int8_t *temperature1, int8_t *humidity1) {
#endif
uint8_t bits[5];
uint8_t i,j = 0;
memset(bits, 0, sizeof(bits));
//reset port
DHT1_DDR |= (1<<DHT1_INPUTPIN); //output
DHT1_PORT |= (1<<DHT1_INPUTPIN); //high
_delay_ms(100);
//send request
DHT1_PORT &= ~(1<<DHT1_INPUTPIN); //low
#if DHT1_TYPE == DHT1_DHT11
_delay_ms(18);
#elif DHT1_TYPE == DHT1_DHT22
_delay_us(500);
#endif
DHT1_PORT |= (1<<DHT1_INPUTPIN); //high
DHT1_DDR &= ~(1<<DHT1_INPUTPIN); //input
_delay_us(40);
//check start condition 1
if((DHT1_PIN & (1<<DHT1_INPUTPIN))) {
return -1;
}
_delay_us(80);
//check start condition 2
if(!(DHT1_PIN & (1<<DHT1_INPUTPIN))) {
return -1;
}
_delay_us(80);
//read the data
uint16_t timeoutcounter = 0;
for (j=0; j<5; j++) { //read 5 byte
uint8_t result=0;
for(i=0; i<8; i++) {//read every bit
timeoutcounter = 0;
while(!(DHT1_PIN & (1<<DHT1_INPUTPIN))) { //wait for an high input (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT1_TIMEOUT) {
return -1; //timeout
}
}
_delay_us(30);
if(DHT1_PIN & (1<<DHT1_INPUTPIN)) //if input is high after 30 us, get result
result |= (1<<(7-i));
timeoutcounter = 0;
while(DHT1_PIN & (1<<DHT1_INPUTPIN)) { //wait until input get low (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT1_TIMEOUT) {
return -1; //timeout
}
}
}
bits[j] = result;
}
//reset port
DHT1_DDR |= (1<<DHT1_INPUTPIN); //output
DHT1_PORT |= (1<<DHT1_INPUTPIN); //low
_delay_ms(100);
//check checksum
if ((uint8_t)(bits[0] + bits[1] + bits[2] + bits[3]) == bits[4]) {
//return temperature and humidity
#if DHT1_TYPE == DHT1_DHT11
*temperature1 = bits[2];
*humidity1 = bits[0];
#elif DHT1_TYPE == DHT1_DHT22
uint16_t rawhumidity1 = bits[0]<<8 | bits[1];
uint16_t rawtemperature1 = bits[2]<<8 | bits[3];
if(rawtemperature1 & 0x8000) {
*temperature1 = (float)((rawtemperature1 & 0x7FFF) / 10.0) * -1.0;
} else {
*temperature1 = (float)(rawtemperature1)/10.0;
}
*humidity1 = (float)(rawhumidity1)/10.0;
#endif
return 0;
}
return -1;
}
/*
* get temperature
*/
#if DHT1_FLOAT == 1
int8_t dht_gettemperature1(float *temperature1) {
float humidity1 = 0;
#elif DHT_FLOAT == 0
int8_t dht_gettemperature1(int8_t *temperature1) {
int8_t humidity1 = 0;
#endif
return dht_getdata1(temperature1, &humidity1);
}
/*
* get humidity
*/
#if DHT1_FLOAT == 1
int8_t dht_gethumidity1(float *humidity1) {
float temperature1 = 0;
#elif DHT1_FLOAT == 0
int8_t dht_gethumidity1(int8_t *humidity1) {
int8_t temperature1 = 0;
#endif
return dht_getdata(&temperature1, humidity1);
}
/*
* get temperature and humidity
*/
#if DHT1_FLOAT == 1
int8_t dht_gettemperaturehumidity1(float *temperature1, float *humidity1) {
#elif DHT1_FLOAT == 0
int8_t dht_gettemperaturehumidity1(int8_t *temperature1, int8_t *humidity1) {
#endif
return dht_getdata(temperature1, humidity1);
}[/syntax]
oraz z pliku main.c wycinek odpowiedzialny za wyswietlanie, przekazuje to do wyświetlacza
[syntax=c]if(dht_gettemperaturehumidity1(&temperature1, &humidity1) != -1) {
itoa(temperature1, t2, 10);
itoa(humidity1, w2, 10);
}[/syntax]Statystyki: Napisane przez keke — 13 lis 2017, o 14:48
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