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DS18B20温度采集通过串口送入电脑
程序肯定还是把其它的驱动组合，呵呵，EDN51验证。显示4位温度。串口助手设置 1200 8 N 1哦
给点支持吧
#include <AT89x52.h>
#include <intrins.h>
//*****************************************
sbit DS18b20_DQ = P1^6 ;
bit flag;
unsigned char *p;
char a[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90,0x88,0x83,0xc6,0x86,0x8e,0x82};
char b[16]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,
0x00,0x19,0x08,0x03,0x46,0x06,0x0e,0x02};
char one,two,three,four;
unsigned char code CrcTable [256]={
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
unsigned char temp_buff[9]; //存储读取的字节，read scratchpad为9字节，read rom ID为8字节
unsigned char crc_data;
float Temperature;
unsigned char id_buff[8];
/******定义函数****************/
# define uchar unsigned char
# define uint unsigned int
void LCD_init(void);//初始化函数
void LCD_write_command(uchar command);//写指令函数
void LCD_write_data(uchar dat);//写数据函数
void LCD_disp_char(uchar x,uchar y,uchar dat);//在某个屏幕位置上显示一个字符,X（0-16),y(1-2)
void delay_n40us(uint n);//延时函数
//****************************************************/
void TempDelay (uint us)
{
while(us--);
}
//******************************************************/
void Init18b20 (void)
{
DS18b20_DQ = 1;
_nop_();
DS18b20_DQ = 0;
TempDelay(86); //delay 530 uS//80
_nop_();
DS18b20_DQ = 1;
TempDelay(14); //delay 100 uS//14
_nop_();
_nop_();
_nop_();
if(DS18b20_DQ==0)
flag = 1; //detect 1820 success!
else
flag = 0; //detect 1820 fail!
TempDelay(20); //20
_nop_();
_nop_();
DS18b20_DQ = 1;
}
/******************** *********
*Function:向18B20写入一个字节*/
void WriteByte (uchar wr) //单字节写入
{
uchar i;
for (i=0;i<8;i++)
{
DS18b20_DQ = 0 ;
_nop_();
DS18b20_DQ = wr & 0x01;
TempDelay(5); //delay 45 uS //5
_nop_();
_nop_();
DS18b20_DQ = 1;
wr >>= 1;
}
}
/************************************************************
*Function:读18B20的一个字节
*************************************************************/
uchar ReadByte (void) //读取单字节
{
uchar i,u=0;
for(i=0;i<8;i++)
{
DS18b20_DQ = 0 ;
u >>= 1;
DS18b20_DQ = 1;
if(DS18b20_DQ ==1 )
u |= 0x80;
TempDelay (4);
_nop_();
}
return(u);
}
/************************************************************
*Function:读18B20
*************************************************************/
void read_bytes (uchar j)
{
uchar i;
for(i=0;i<j;i++)
{
*p = ReadByte();
p++;
}
}
/*Function:CRC校验********************************/
uchar CRC (uchar j)
{
uchar i,crc_data=0;
for(i=0;i<j;i++) //查表校验
crc_data = CrcTable[crc_data^temp_buff[i]];
return (crc_data);
}
/************************************************************
*Function:读取温度
*************************************************************/
void GemTemp (void)
{
read_bytes (9);
if (CRC(9)==0) //校验正确
{
Temperature = temp_buff[1]*0x100 + temp_buff[0];
// Temperature *= 0.625;
Temperature /= 16;
TempDelay(1);
}
}
/************************************************************
*Function:内部配置
*************************************************************/
void Config18b20 (void) //重新配置报警限定值和分辨率
{
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x4e); //write scratchpad
WriteByte(0x19); //上限
WriteByte(0x1a); //下限
WriteByte(0x7f); //set 11 bit (0.125)
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0x48); //保存设定值
Init18b20();
WriteByte(0xcc); //skip rom
WriteByte(0xb8); //回调设定值
}
/************************************************************
*Function:读18B20ID
*parameter:
*Return:
*Modify:
*************************************************************/
void ReadID (void)//读取器件 id
{
Init18b20();
WriteByte(0x33); //read rom
read_bytes(8);
}
/************************************************************
*Function:18B20ID全处理*/
void TemperatuerResult(void)
{
p = id_buff;
ReadID();
Config18b20();
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0x44); //Temperature convert
Init18b20 ();
WriteByte(0xcc); //skip rom
WriteByte(0xbe);
}
void Get_Temperature()
{
p = temp_buff;
GemTemp();
}
/*void delay_n40us(uint n)
{
uint i;
uchar j;
for(i=n;i>0;i--)
for(j=0;j<15;j++)
; //
}*/
//初始化232
void Init_RSC232()
{
//波特率：1200bit/s ，1位起始位，1位停止位，8位数据位
TMOD = 0x20;
TL1 = 0xE8;
TH1 = 0xE8;
TR1 = 1;
PCON = 0x00;
SCON = 0x50;
}
void printc(unsigned char c)
{
TI = 0 ;
SBUF = c ;
while(TI==0)
;
TI = 0 ;
}
void prints(unsigned char c[])
{
unsigned char index = 0 ;
while(c[index]!='\0')
{
printc(c[index]);
index++;
}
}
void printhex(unsigned char i)
{
unsigned char j;
j = i + 0x30;
printc(j);
}
void delay_n40us(uint n)
{
uint i;
uchar j;
for(i=n;i>0;i--)
for(j=0;j<15;j++)
; //
} //
//*******************************
//*********主函数*****************
void main(void)
{ int Temper;
Init_RSC232();
while(1)
{
TemperatuerResult();
Get_Temperature();
// prints("Welcome to jizzll's blog!\n\r");
Temper=(int)Temperature;
one="Temper/10";
two="Temper"%10;
three=(Temperature-Temper)*100/10;
four=(Temperature-Temper)*100-three*10;
// printhex(Temperature);
printhex(one);
printhex(two);
prints(".");
printhex(three);
printhex(four);
prints(".C\n");
delay_n40us(1000);
}
}
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