AVR M16 8M 的DS18B20頭文件

只需調(diào)用gettemp()；就可以了！出口參數(shù)wmh是顯示的高位，wml使顯示的低位，然后調(diào)用你的顯示程序就可以了！

/*************************************************************************
ds18b20頭文件
M16內(nèi)部8M
*************************************************************************/
#define CLR_DIR_1WIRE DDRC&=~BIT(2) //只要修改這里的參數(shù)就可以了！呵呵！
#define SET_DIR_1WIRE DDRC|=BIT(2)//里面什么都不用該！
#define CLR_OP_1WIRE PORTC&=~BIT(2)
#define SET_OP_1WIRE PORTC|=BIT(2)
#define CHECK_IP_1WIRE (PINC & 0x04)//檢測
unsigned char wmh,wml;
void init_1820()
{
SET_DIR_1WIRE;//設置PC2 為輸出
SET_OP_1WIRE;
CLR_OP_1WIRE;
delay_nus(480);//480us以上
SET_OP_1WIRE;
CLR_DIR_1WIRE;
delay_nus(20); //15~60us
while(CHECK_IP_1WIRE);
SET_DIR_1WIRE;
SET_OP_1WIRE;
delay_nus(140); //60~240us
}
void write_1820(unsigned char x)
{
unsigned char m;
for(m=0;m<8;m++)
{
CLR_OP_1WIRE;
if(x&(1< SET_OP_1WIRE;
else
{CLR_OP_1WIRE;}
delay_nus(40); //15~60us
SET_OP_1WIRE;
}
SET_OP_1WIRE;
}
unsigned char read_1820()
{
unsigned char temp,k,n;
temp=0;
for(n=0;n<8;n++)
{
CLR_OP_1WIRE;
SET_OP_1WIRE;
CLR_DIR_1WIRE;
k=(CHECK_IP_1WIRE);//讀數(shù)據(jù),從低位開始
if(k)
temp|=(1<else
temp&=~(1<delay_nus(50); //60~120us
SET_DIR_1WIRE;
}
return (temp);
}

void gettemp() //讀取溫度值
{
unsigned char temh,teml,wm0,wm1,wm2,wm3;
init_1820();//復位18b20
write_1820(0xcc); // 發(fā)出轉換命令
write_1820(0x44);
//delay_nms(800); //不延時也好使，不知道怎么回事！
init_1820();
write_1820(0xcc);//發(fā)出讀命令
write_1820(0xbe);
teml=read_1820();//讀數(shù)據(jù)
temh=read_1820();
wm0=teml>>4; //只要高8位的低四位和低8位的高四位，溫度范圍0~99啦！
wm1=temh<<4;
wm2=wm1+wm0;//16進制轉10進制
wm3=wm2/100;
wmh=(wm2%100)/10; //出口參數(shù)了！wmh是顯示的高位，wml使顯示的低位
wml=(wm2%100)%10;
}


//延時程序：

//delay.h
/*-----------------------------------------------------------------------
延時函數(shù)
系統(tǒng)時鐘：8M
-----------------------------------------------------------------------*/
void delay_1us(void) //1us延時函數(shù)
{
asm("nop");
}

void delay_nus(unsigned int n) //N us延時函數(shù)
{
unsigned int i=0;
for (i=0;i delay_1us();
}

void delay_1ms(void) //1ms延時函數(shù)
{
unsigned int i;
for (i=0;i<1140;i++);
}

void delay_nms(unsigned int n) //N ms延時函數(shù)
{
unsigned int i=0;
for (i=0;i delay_1ms();
}