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//bài viết này tặng cho nhưng bạn mới học AVR ,chúc các bạn thành công
//LAP TRINH : DO NHIET DO PHONG
//TH : PHAN THE BINH
//CN : DIEU KHIEN TU DONG
//NHT : 30/12/2007
//--------------------------------------
#include <mega8515.h>
#include <ds18b20.h>
#define load PORTC.5
#define data PORTC.4 //hien thi qua ic595 voi 4 led 7 thanh
#define clk PORTC.6
//--------------------------------------
#asm
.equ __w1_port=0x1b
.equ __w1_bit=0
#endasm
//---------------------------------------
#define MAX_DEVICES 8
unsignedunsigned char byte);
//---------------------------------------
void main(void)
{ char rom_code[MAX_DEVICES][9];
//---------------------------------------
void hien_thi (void);
void dich(
int temp;
unsigned char i,devices,sodem;
//---------Khoi tao cong vao ra----------
DDRC=0xff;
//--------Khoi tao giao tiep i2c---------
devices=w1_search(0xf0,rom_code);
//--khai bao do phan giai 12bit ,nhiet do cach bao TL=10,TH=40 do--
for (i=0;i<devices;)
if (!ds18b20_init(&rom_code[i++][0],10,40,DS18B20_12BIT_RES))
{
while (1); //Dung he thong neu thiet bi loi
};
//-----------hien thi nhiet do----------------------
while (1)
{
while (sodem==temp){ //kiem tra nhiet do co thay doi khong
for (i=0;i<devices;i++)
{
temp=ds18b20_temperature(&rom_code[i][0]); //neu nhiet do khong thay doi thi khong day du lieu ra 595
};
}; //neu nhiet do thay doi thi day du lieu ra 595
sodem=temp;
hien_thi();
};
}
//-------------------------------------------------
void hien_thi (void)
{
unsigned char ht,dv,p,q,sodem,n_7seg,led_7seg;
unsigned char byte,a,b;
dv=sodem % 10;
p=sodem / 10;
ht=p % 10;
q=p / 10;
//-------------------------------------------------
n_7seg=dv;
switch (n_7seg)
{
case 0:
led_7seg=40;
break;
case 1:
led_7seg=252;
break;
case 2:
led_7seg=25;
break;
case 3:
led_7seg=88;
break;
case 4:
led_7seg=204;
break;
case 5:
led_7seg=74;
break;
case 6:
led_7seg=10;
break;
case 7:
led_7seg=248;
break;
case 8:
led_7seg=8;
break;
case 9:
led_7seg=72;
break;
}
a=led_7seg;
n_7seg=ht;
switch (n_7seg)
{
case 0:
led_7seg=40;
break;
case 1:
led_7seg=252;
break;
case 2:
led_7seg=25;
break;
case 3:
led_7seg=88;
break;
case 4:
led_7seg=204;
break;
case 5:
led_7seg=74;
break;
case 6:
led_7seg=10;
break;
case 7:
led_7seg=248;
break;
case 8:
led_7seg=8;
break;
case 9:
led_7seg=72;
break;
}
b=led_7seg;
//------------------------------------------------
byte=43;
dich(byte);
byte=201;
dich(byte);
byte=a;
dich(byte);
byte=b;
dich(byte);
}
//------------------------------------------------
void dich(unsigned char byte)
{
unsigned char k;
for(k=0;k<8;k++)
{
data=(byte>>k)&0x01;
clk=0;
clk=1;
}
load=0;
load=1;
}
//ket thuc chuong trinh
//------------------------------------------------
//------------------------------------------------
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