Hello i have microcontroler atmega32, 7 segment display and ds18b20 temperature sensor, i make sensor to read temperature and give me temperature, i need to know how to convert temperature in integer for represent in 7 sengment display
this is the code:
#ifndef DS18B20_H_
#define DS18B20_H_
#define F_CPU 16000000UL
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define DS18B20_PORT PORTC
#define DS18B20_DDR DDRC
#define DS18B20_PIN PINC
#define DS18B20_DQ PC0
#define DS18B20_CMD_CONVERTTEMP 0x44
#define DS18B20_CMD_RSCRATCHPAD 0xbe
#define DS18B20_CMD_WSCRATCHPAD 0x4e
#define DS18B20_CMD_CPYSCRATCHPAD 0x48
#define DS18B20_CMD_RECEEPROM 0xb8
#define DS18B20_CMD_RPWRSUPPLY 0xb4
#define DS18B20_CMD_SEARCHROM 0xf0
#define DS18B20_CMD_READROM 0x33
#define DS18B20_CMD_MATCHROM 0x55
#define DS18B20_CMD_SKIPROM 0xcc
#define DS18B20_CMD_ALARMSEARCH 0xec
//-------------------------------------------------------------------
//stop orice intrerupere in read
#define DS18B20_STOPINTERRUPTONREAD 1
//functions
extern double ds18b20_gettemp();
#endif
int ms_flag = 0;
int digit_selection_counter = 0;
int temp_flag = 0;
void timer_delay()
{
TCCR1B |= (1 << WGM12);
TIMSK |= (1 << OCIE1A);
sei();
OCR1A = 0;
TCCR1B |= ((1 << CS10) | (1 << CS12));// 16MHz/1024
}
ISR (TIMER1_COMPA_vect){
ms_flag ++;
temp_flag ++;
}
//-------------------------------------------------------------------
uint8_t ds18b20_reset(){
uint8_t i;
//low pentru 480 us
DS18B20_PORT &= ~(1<<DS18B20_DQ); //low
DS18B20_DDR |= (1<<DS18B20_DQ);//output
_delay_us(480);
//ridica linia si asteapta 60 us
DS18B20_DDR &= ~(1<<DS18B20_DQ); //intput
_delay_us(60);
i = (DS18B20_PIN &(1<<DS18B20_DQ));
_delay_us(420);
return i;
}
//-------------------------------------------------------------------
void ds18b20_writebit(uint8_t bit){
//low pentru 1 us
DS18B20_PORT &= ~(1<<DS18B20_DQ); //low
DS18B20_DDR |= (1<<DS18B20_DQ);//OUTPUT
_delay_us(1);
//daca vrem sa scriem 1, eliberam linia (daca nu linia se va pastra low)
if (bit)
{
DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
}
//asteapta 60 us si restabileste linia
_delay_us(60);
DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
}
//-------------------------------------------------------------------
uint8_t ds18b20_readbit(void)
{
uint8_t bit = 0;
//low pentru 1 us
DS18B20_PORT &= ~(1<<DS18B20_DQ); //low
DS18B20_DDR |= (1<<DS18B20_DQ); //output
_delay_us(1);
//ridica linia si asteapta pentru 14us
DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
_delay_us(14);
//citeste valoarea
if(DS18B20_PIN &(1<<DS18B20_DQ)) bit = 1;
//Asteapta 45us si returneaza valoarea citita
_delay_us(45);
return bit;
}
//-------------------------------------------------------------------
void ds18b20_writebyte(uint8_t byte)
{
uint8_t i = 8;
while (i--)
{
ds18b20_writebit(byte&1);
byte >>= 1;
}
}
//-------------------------------------------------------------------
uint8_t ds18b20_readbyte(void)
{
uint8_t i = 8;
uint8_t n = 0;
while (i--)
{
n >>= 1;
n|=(ds18b20_readbit()<<7);
}
return n;
}
//-------------------------------------------------------------------
double ds18b20_gettemp()
{
uint8_t temperature_l;
uint8_t temperature_h;
double retd = 0;
#if DS18B20_STOPINTERRUPTONREAD == 1
cli();
#endif
ds18b20_reset(); // reset
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_CONVERTTEMP); //start convert temperatur
while(!ds18b20_readbit()); //asteapra pana conversiunea este completa
ds18b20_reset();
ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
ds18b20_writebyte(DS18B20_CMD_RSCRATCHPAD);//read scratchpad
//citeste 2 byte din scratchpad
temperature_l = ds18b20_readbyte();
temperature_h = ds18b20_readbyte();
#if DS18B20_STOPINTERRUPTONREAD == 1
sei();
#endif
retd = ((temperature_h << 8) + temperature_l) * 0.0625;
return retd;
}
//-------------------------------------------------------------------
int main(void)
{
timer_delay();
sei();
int arr1 [10]={0x81,0xCF, 0x92, 0x86, 0xCC, 0xA4, 0xA0, 0x8F, 0x80, 0x84};
double temperature = 0;
int nr1 = 0;
int nr2 = 0;
int nr3 = 0;
int nr4 = 0;
DDRB = (1<<DDB7) | (1<<DDB6) | (1<<DDB5) | (1<<DDB4) | (1<<DDB3) | (1<<DDB2) | (1<<DDB1) | (1<<DDB0);
PORTB = (0<<PB7) | (0<<PB6) | (0<<PB5) | (0<<PB4) | (0<<PB3) | (0<<PB2) | (0<<PB1) | (0<<PB0);
DDRA = (1<<DDA7) | (1<<DDA6) | (1<<DDA5) | (1<<DDA4) | (1<<DDA3) | (1<<DDA2) | (1<<DDA1) | (1<<DDA0);
PORTA = (0<<PA7) | (0<<PA6) | (0<<PA5) | (0<<PA4) | (1<<PA3) | (1<<PA2) | (1<<PA1) | (1<<PA0);
while (1)
{
temperature = ds18b20_gettemp();
_delay_ms(500);
if(ms_flag == 15)
{
ms_flag = 0;
digit_selection_counter ++;
if (digit_selection_counter >= 4)
{
digit_selection_counter = 0;
}
}
switch(digit_selection_counter){
case 0:
PORTA =~(1<<digit_selection_counter); //tranzistorul de afisare ON
PORTB = arr1[nr1]; //pune valoarea la portul care este necesar pentru afisarea cifrelor corespunzatoare
break;
case 1:
PORTA =~(1<<digit_selection_counter); //acelasi lucru de sus doar ca pentru segmentul numrul 2
PORTB = arr1[nr2];
break;
case 2:
PORTA =~(1<<digit_selection_counter); //acelasi lucru de sus doar ca pentru segmentul numrul 3
PORTB = arr1[nr3];
break;
/*case 3:
PORTA =~(1<<digit_selection_counter); //acelasi lucru de sus doar ca pentru segmentul numrul 4
PORTB = arr1[nr4];
break;*/
default: digit_selection_counter = 0;
}
}
}
i have double retd = temperature, in function ds18b20_gettemp(), and i have in in main double temperature = ds18b20_gettemp(); , if temperature = 26,32 C i need to convert this in , nr1 = 2, nr2 = 6, nr3 = 3, nr4 = 2
