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標題: cc2530 溫度傳感器 [打印本頁]

作者: 99067559 時間: 2018-1-8 09:21
標題: cc2530 溫度傳感器

#include <reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit fm=P2^3;

sbit DS=P2^2; //define interface 定義連接

uint temp; // variable of temperature 溫度變化

uchar flag1; // sign of the result positive or negative 表明結果的正確與否

unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,

0xf8,0x80,0x90,};

unsigned char code table1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,

0x78,0x00,0x10};

void delay(uint count) //delay

{

uint i;

while(count)

{

i=200;

while(i>0)

i--;

count--;

}

void dsreset(void) //send reset and initialization command 重置初始數據

{

uint i;

DS=0;

i=103;

while(i>0)i--;

DS=1;

i=4;

while(i>0)i--;

}

bit tmpreadbit(void) //read a bit 讀點

{

uint i;

bit dat;

DS=0;i++; //i++ for delay

DS=1;i++;i++;

dat=DS;

i=8;while(i>0)i--;

return (dat);

}

uchar tmpread(void) //read a byte date 讀一個字節數據

{

uchar i,j,dat;

dat=0;

for(i=1;i<=8;i++)

{

j=tmpreadbit();

dat=(j<<7)|(dat>>1); //讀出的數據最低位在最前面，這樣剛好一個字節在DAT里

}

return(dat);

}

void tmpwritebyte(uchar dat) //write a byte to ds18b20

{

uint i;

uchar j;

bit testb;

for(j=1;j<=8;j++)

{

testb=dat&0x01;

dat=dat>>1;

if(testb) //write 1

{

DS=0;

i++;i++;

DS=1;

i=8;while(i>0)i--;

}

else

{

DS=0; //write 0

i=8;while(i>0)i--;

DS=1;

i++;i++;

}

void tmpchange(void) //DS18B20 begin change

{

dsreset();

delay(1);

tmpwritebyte(0xcc); // address all drivers on bus

tmpwritebyte(0x44); // initiates a single temperature conversion

}

uint tmp() //get the temperature

{

float tt;

uchar a,b;

dsreset();

delay(1);

tmpwritebyte(0xcc);

tmpwritebyte(0xbe);

a=tmpread();

b=tmpread();

temp=b;

temp<<=8; //two byte compose a int variable

temp=temp|a;

tt=temp*0.0625;

temp=tt*10+0.5;

return temp;

}

void readrom() //read the serial

{

uchar sn1,sn2;

dsreset();

delay(1);

tmpwritebyte(0x33);

sn1=tmpread();

sn2=tmpread();

}

void delay10ms() //delay

{

uchar a,b;

for(a=10;a>0;a--)

for(b=60;b>0;b--);

}

void display(uint temp) //顯示程序

{

uchar A0,A1,A2,A2t,A3,ser;

ser=temp/10;

SBUF=ser;

A0=temp/1000;

A1=(temp/100)%10;

A2t=temp%100;

A2=A2t/10;

A3=A2t%10;

P1=0x01;

P0=table[A0];//顯示百位

delay(1);

P1=0X02;

P0=table[A1]; //顯示十位

delay(1);

P1=0X04;

P0=table1[A2]; //顯示個位

delay(1);

P1=0X08;

P0=table[A3]; //顯示十分位

delay(1);

}

void main()

{

har a;

{

tmpchange();

// delay(200);

for(a=10;a>0;a--)

{

display(tmp());

if(temp>300|temp<270)

fm=0;

else

fm=1;

}

}while(1);

}

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