[syntax=c]/*
* main.c
*
* Created on: 2 wrz 2014
* Author: Janusz M.
*/
#include <stdlib.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "AM2302/am2302.h"
#include "MKUART/mkuart.h"
#include "MK_TERMINAL/mk_term.h"
int main(void)
{
char printbuff[4];
//init uart
USART_Init(__UBRR);// 19200
//init interrupt
sei();
uint16_t temperature = 0;
uint16_t humidity = 0;
tr_cls(1);
tr_attr( 0, TR_CYAN, TR_BLACK );
//tr_cursor_hide(1);
//tr_attr( 0, TR_BLACK, TR_YELLOW );
while(1)
{
if(AM2302_gettemperaturehumidity(&temperature, &humidity, AM2302_PIN1) != -1)
{
tr_locate(5, 7);
itoa(temperature/10, printbuff, 10);
uart_puts("Temperatura 1: ");
if(AM2302_znak) uart_putc('-');
uart_puts(printbuff);
uart_putc('.');
itoa(temperature%10, printbuff, 10);
uart_puts(printbuff);
uart_puts(" °C\r\n");
tr_locate(8, 7);
itoa(humidity/10, printbuff, 10);
uart_puts("Wilgotność 1: ");
uart_puts(printbuff);
uart_puts(".");
itoa(humidity%10, printbuff, 10);
uart_puts(printbuff);
uart_puts(" %\r\n");
}
else
{
uart_puts("AM2302 nr1: error\r\n");
}
uart_puts("\r\n");
_delay_ms(1500);
if(AM2302_gettemperaturehumidity(&temperature, &humidity, AM2302_PIN2) != -1)
{
tr_locate(15, 7);
itoa(temperature/10, printbuff, 10);
uart_puts("Temperatura 2: ");
if(AM2302_znak) uart_putc('-');
uart_puts(printbuff);
uart_putc('.');
itoa(temperature%10, printbuff, 10);
uart_puts(printbuff);
uart_puts(" °C\r\n");
tr_locate(18, 7);
itoa(humidity/10, printbuff, 10);
uart_puts("Wilgotność 2: ");
uart_puts(printbuff);
uart_puts(".");
itoa(humidity%10, printbuff, 10);
uart_puts(printbuff);
uart_puts(" %\r\n");
}
else
{
uart_puts("AM2302 nr2: error\r\n");
}
uart_puts("\r\n");
}
return 0;
}[/syntax]
[syntax=c]/*
* am2302.h
*
* Created on: 2 wrz 2014
* Author: Janusz M.
*/
#ifndef AM2302_H_
#define AM2302_H_
//setup port
#define AM2302_PORTD
#define AM2302_PIN16
#define AM2302_PIN27
//timeout retries
#define AM2302_TIMEOUT 200
extern uint8_t AM2302_znak;
//functions
extern int8_t AM2302_gettemperature(uint16_t *temperature, const uint8_t M2302_PIN);
extern int8_t AM2302_gethumidity(uint16_t *humidity, const uint8_t M2302_PIN);
extern int8_t AM2302_gettemperaturehumidity(uint16_t *temperature, uint16_t *humidity, const uint8_t M2302_PIN);
#endif /* AM2302_H_ */[/syntax]
[syntax=c]/*
* am2302.c
*
* Created on: 2 wrz 2014
* Author: Janusz M.
*/
/*
DHT Library 0x03
copyright (c) Davide Gironi, 2012
*/
#include <avr/io.h>
#include <util/delay.h>
#include "am2302.h"
#include "../makra.h"
uint8_t AM2302_znak;// dla wartości dodatnich temperatury = 0, dla ujemnych = 1
/*
* get data from sensor
*/
int8_t AM2302_getdata(uint16_t *temperature, uint16_t *humidity, const uint8_t AM2302_PIN)
{
uint8_t AM2302_data[5];
uint8_t i,j = 0;
//reset port
DDR(AM2302_PORT) |= (1 << AM2302_PIN); //output
PORT(AM2302_PORT) |= (1 << AM2302_PIN); //high
_delay_ms(100);
//send request
PORT(AM2302_PORT) &= ~(1 << AM2302_PIN); //low
_delay_us(500);
PORT(AM2302_PORT) |= (1 << AM2302_PIN); //high
DDR(AM2302_PORT) &= ~(1 << AM2302_PIN); //input
_delay_us(40);
//check start condition 1
if((PIN(AM2302_PORT) & (1 << AM2302_PIN))) {
return -1;
}
_delay_us(80);
//check start condition 2
if(!(PIN(AM2302_PORT) & (1 << AM2302_PIN))) {
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(!(PIN(AM2302_PORT) & ( 1<< AM2302_PIN)))
{ //wait for an high input (non blocking)
timeoutcounter++;
if(timeoutcounter > AM2302_TIMEOUT)
{
return -1; //timeout
}
}
_delay_us(30);
if(PIN(AM2302_PORT) & (1 << AM2302_PIN)) result |= (1 << (7 - i));//if input is high after 30 us, get result
timeoutcounter = 0;
while(PIN(AM2302_PORT) & (1 << AM2302_PIN))
{ //wait until input get low (non blocking)
timeoutcounter++;
if(timeoutcounter > AM2302_TIMEOUT) return -1; //timeout
}
}
AM2302_data[j] = result;
}
//reset port
DDR(AM2302_PORT) |= (1 << AM2302_PIN); //output
PORT(AM2302_PORT) |= (1 << AM2302_PIN); //low
_delay_ms(100);
//check checksum
if ((uint8_t)(AM2302_data[0] + AM2302_data[1] + AM2302_data[2] + AM2302_data[3]) == AM2302_data[4])
{
//return temperature and humidity
uint16_t rawhumidity = (AM2302_data[0] << 8) | AM2302_data[1];// wilgotność - wartość nieobrobiona
uint16_t rawtemperature = (AM2302_data[2] << 8) | AM2302_data[3];// temperatura - wartość nieobrobiona
if(rawtemperature & 0x8000)
{
*temperature = rawtemperature & 0x7FFF;
AM2302_znak = 1;
}
else
{
*temperature = rawtemperature;
AM2302_znak = 0;
}
*humidity = rawhumidity;
return 0;
}
return -1;
}
/*
* get temperature
*/
int8_t AM2302_gettemperature(uint16_t *temperature, const uint8_t AM2302_PIN)
{
uint16_t humidity = 0;
return AM2302_getdata(temperature, &humidity, AM2302_PIN);
}
/*
* get humidity
*/
int8_t AM2302_gethumidity(uint16_t *humidity, const uint8_t AM2302_PIN)
{
uint16_t temperature = 0;
return AM2302_getdata(&temperature, humidity, AM2302_PIN);
}
/*
* get temperature and humidity
*/
int8_t AM2302_gettemperaturehumidity(uint16_t *temperature, uint16_t *humidity, const uint8_t AM2302_PIN)
{
return AM2302_getdata(temperature, humidity, AM2302_PIN);
}[/syntax]
[syntax=c]/*
* makra.h
*
* Created on: 2012-08-23
* Author: Janusz Mika
*/
#ifndef MAKRA_H_
#define MAKRA_H_
// Makra upraszczające dostęp do portów
// *** PORT
#define PORT(x) XPORT(x)
#define XPORT(x) (PORT##x)
// *** PIN
#define PIN(x) XPIN(x)
#define XPIN(x) (PIN##x)
// *** DDR
#define DDR(x) XDDR(x)
#define XDDR(x) (DDR##x)
#define ROTATE_RIGHT(x) x=(x>>1)|(x<<7)
#define ROTATE_LEFT(x) x=(x<<1)|(x>>7)
#endif /* MAKRA_H_ */[/syntax]
Do obsługi UART-a i terminala wykorzystałem biblioteki z poradników Pana Mirka.
W układzie testowym miałem dwa czujniki podpięte do zestawu ATB z procesorem ATmega32.Statystyki: Napisane przez janusz17 — 14 sty 2015, o 16:07
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