1-wire.c

ds18b20 thermometer with lcd, ds18b20 thermometer with lcd, ds18b20 thermometer with lcd

#include <avr/io.h>
#include <stdlib.h>
#include <util/delay.h>
#include "1-wire.h"
#include "lcd.h"

char buf[8];

unsigned char RESET_PULSE(void)
{
	unsigned char PRESENCE;
	CLEAR_1Wire;
	_delay_us(500);
	SET_1Wire;
	_delay_us(30);
	if (bit_is_clear(PORT_1Wire, WE)) { PRESENCE = 1;} else { PRESENCE = 0; }
	_delay_us(470);
	if (bit_is_set(PORT_1Wire, WE)) { PRESENCE = 1;} else { PRESENCE = 0; }
	return PRESENCE;
}

void send(char bit)
{
	CLEAR_1Wire;
	_delay_us(5);
	if (bit == 1) SET_1Wire;
	_delay_us(80);
	SET_1Wire;
}

unsigned char read(void)
{
	unsigned char PRESENCE = 0;
	CLEAR_1Wire;
	_delay_us(2);
	SET_1Wire;
	_delay_us(15);
	if (bit_is_set(PORT_1Wire,WE)) PRESENCE =1; else PRESENCE = 0;
	return PRESENCE;
}

void send_byte(char wartosc)
{
	unsigned char i;
	unsigned char pom;

	for (i = 0; i < 8; i++)
	{
		pom = wartosc>>1;
		pom &= 0x01;
		send(pom);
	}
	_delay_us(100);
}

unsigned char read_byte(void)
{
	unsigned char i;
	unsigned char wartosc = 0;

	for (i=0; i<8; i++)
	{
		if (read()) wartosc|=0x01<<i;
		_delay_us(15);
	}
	return wartosc;
}

void get_this_stupid_temperature_now(void)
{
	unsigned char sprawdz;
	char temp1=0, temp2=0;
	
	sprawdz=RESET_PULSE();
	if (sprawdz == 1)
	{
		send_byte(0xCC);
		send_byte(0x44);
		_delay_us(750);

		sprawdz = RESET_PULSE();
		send_byte(0xCC);
		send_byte(0xBE);

		temp1 = read_byte();
		temp2 = read_byte();

		sprawdz = RESET_PULSE();

		float temp = 0;
		//int temp = 0;
		//temp = (int)(temp1+(temp2*256))/16;

		//int temp = 0;
		temp = (float)(temp1+(temp2*256))/16;
		//temp = (temp1+(temp2*256))/16;
		
		dtostrf(temp,1,1,buf);
		//ltoa(temp,buf,10);
		//display buf
		lcd_str(buf);
	}
}