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標(biāo)題: AVR單片機(jī)使用DS18B20測(cè)量負(fù)溫度的程序資料 [打印本頁(yè)]

作者: 51黑黑黑 時(shí)間: 2016-3-4 16:29
標(biāo)題: AVR單片機(jī)使用DS18B20測(cè)量負(fù)溫度的程序資料
//main.c
#include<iom16v.h>
#include <macros.h>
#include "18B20.h"
#include"disp.h"
#define  uint  unsignedint
#define  uchar unsigned char
const uchar shu[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,
               0x82,0xF8,0x80,0x90};
const uchar bshu[3]={0xff,0xf9,0xbf};

//延時(shí)函數(shù)在4M時(shí)延時(shí)1ms
void s_1ms(unsigned int ms)
{
unsigned intaa;
for(;ms>=1;ms--)
{
for(aa=0;aa<=800;aa++)
{;}
}
}
void main()
{
uint wendu,xiao,ge,shi,bai;
uchar  fh;
DDRA =0xff;
PORTA =0xff;
s_1ms(200); //延時(shí)200ms
ds1820_reset();  //DS18B20復(fù)位
while (1)
  {
ds1820_start();

  wendu =ds1820_read_temp();  //讀取溫度數(shù)值

  fh=ds1820_fh();

  if(fh)
  {
  wendu=~(wendu)+1;
wendu = (wendu * 10)/16;    //數(shù)值處理

   wendu = wendu % 1000;

  shi= wendu / 100; //顯示第2位
  wendu = wendu % 100;
  ge= wendu /10; //顯示ge位
  xiao=wendu %10; //顯示小數(shù)位

  display(0,shu[xiao]);  //小數(shù)位
  display(1,shu[ge]&0x7f); //個(gè)位
  display(2,shu[shi]); //shi
  display(3,bshu[2]);  //bai位,0不顯示
}

else
{
wendu = (wendu * 10) /16;    //數(shù)值處理

  bai = wendu /1000; //bai位
  wendu = wendu %1000;

  shi= wendu / 100; //顯示第2位
  wendu = wendu % 100;
  ge= wendu /10; //顯示ge位
  xiao=wendu %10; //顯示小數(shù)位

  display(0,shu[xiao]);  //小數(shù)位
  display(1,shu[ge]&0x7f); //個(gè)位
  display(2,shu[shi]); //shi
  display(3,bshu[bai]);  //bai位,0不顯示
}
  }
}

//18B20.h
#define uchar unsigned char
#define uint  unsigned int
//設(shè)置成輸入
#define DQ_INPUT DDRC&= ~BIT(7)
//設(shè)置成輸出
#defineDQ_OUT DDRC |= BIT(7)
//設(shè)置成低電平
#defineDQ_LO    PORTC &= ~BIT(7)
//設(shè)置成高電平
#defineDQ_HI    PORTC |= BIT(7)
//讀出
#defineDQ_R    PINC &BIT(7)
//中斷標(biāo)志
ucharinit_f;
//延時(shí)函數(shù)
void delay_us(uint ms)
{
uchar  tm;
while(ms--)
{
  for(tm=0;tm<2;tm++);
  }
}
//DS18B20復(fù)位
void ds1820_reset(void)
{
uchar i;
//中斷保護(hù)
init_f =SREG;
//關(guān)中斷
CLI();
DQ_OUT;
DQ_LO;
delay_us(80); //延時(shí)500us
DQ_HI;
DQ_INPUT;
delay_us(10); //延時(shí)80us
i = DQ_R;
delay_us(80); //延時(shí)500us
if (init_f &0x80)  //恢復(fù)中斷狀態(tài)
  {
SEI();
  }
}
//DS18B20字節(jié)讀取
uchar ds1820_read_byte(void)
{
uchar i;
uchar value = 0;
//中斷保護(hù)
init_f = SREG;
//關(guān)中斷
CLI();
for (i = 8; i != 0; i--) {
  value >>= 1;
  DQ_OUT;
  DQ_LO;
  delay_us(2);
  DQ_HI;
  DQ_INPUT;
  if (DQ_R)
{
   value|=0x80;
}
delay_us(10); //延時(shí)60us
  }
if (init_f&&0x80)//恢復(fù)中斷狀態(tài)
{
  SEI();
  }
return(value);
}
//DS18B20字節(jié)寫(xiě)入
void ds1820_write_byte(unsigned char value)
{
uchar i;
init_f =SREG;
CLI();
for (i = 8; i > 0; i--)
{
  DQ_OUT;
  DQ_LO;
  if (value & 0x01)
{
DQ_HI;
}
delay_us(10); //延時(shí)80us
DQ_HI;
value >>= 1;
  }
if (init_f& 0x80)//恢復(fù)中斷狀態(tài)
{
   SEI();
   }
}
//啟動(dòng)ds1820轉(zhuǎn)換
void ds1820_start(void)
{
ds1820_reset();
ds1820_write_byte(0xCC); //勿略ROM
ds1820_write_byte(0x44); //啟動(dòng)轉(zhuǎn)換
}
//讀溫度
uint ds1820_read_temp(void)
{
uint i,wendu;
uchar buf[2];
ds1820_reset();
ds1820_write_byte(0xCC); //勿略ROM
ds1820_write_byte(0xBE); //讀溫度
for (i = 0; i < 2; i++)
  {
  buf[i] = ds1820_read_byte();
  }
wendu =(buf[1]<<8)|buf[0];
return wendu;
}
uint ds1820_fh(void)  //讀正負(fù)溫度符號(hào)
{
uint i,bb;
uchar buf[2];
ds1820_reset();
ds1820_write_byte(0xCC); //勿略ROM
ds1820_write_byte(0xBE); //讀溫度
for (i = 0; i < 2; i++)
  {
  buf[i] = ds1820_read_byte();
  }
  bb=buf[1]&0xf0;
return bb;
}

//disp.h
#define uchar unsigned char
#define uint  unsigned int
#define SHCP_0  PORTA&=~BIT(1)
#define SHCP_1 PORTA|=BIT(1)
#define DS_0 PORTA&=~BIT(3)
#define DS_1 PORTA|=BIT(3)
#define STCP_0  PORTA&=~BIT(2)
#define STCP_1 PORTA|=BIT(2)

void  CKin()
{
SHCP_0;
  NOP();
  SHCP_1;
}
void  Dataout()  //并行輸出
{
STCP_0;
NOP();
STCP_1;
}
void Datein( uchar  date ) //數(shù)據(jù)串行輸入
{
uchar  i,mod;
DDRA=0xff;
for(i=0;i<8;i++)
  {
mod=date&0x80;
if(mod==0x80)
{DS_1;}
else
{DS_0;}
CKin();
date<<=1;
  }
Dataout();  //并行輸出
}
void  weihao(uchar add)
{
DDRA=0xff;
switch(add)
{
case 0:PORTA=0x1f;break;
  case1:PORTA=0x1f|0x80;break;
  case2:PORTA=0x1f|0x40;break;
  case3:PORTA=0x1f|0xc0;break;
  case4:PORTA=0x1f|0x20;break;
  case5:PORTA=0x1f|0xA0;break;
  case6:PORTA=0x1f|0x60;break;
  case7:PORTA=0x1f|0xE0;break;
  default:break;
}

}
void  DELAY(uint  tt)
{
uintmm;
while(tt--)
{
   for(mm=30;mm>0;mm--);
}
}
void display(uchar wei,uchar data)
{
   weihao(wei);
Datein(data);
DELAY(20);
weihao(wei);
Datein(0xff);
}

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