Exemple #1
0
void ReadTemperature()
{
    static unsigned char num=0;
    if(0==num) {

        Init_DS18B20();
        WriteOneChar(0xCC);            // 跳过读序号列号的操作
        WriteOneChar(0x4E);         // //写入"写暂存器"命令,修改TH和TL和分辩率配置寄存器   //先写TH,再写TL,最后写配置寄存器
        WriteOneChar(0x6e);                //写入想设定的温度报警上限
        WriteOneChar(0x00);                //写入想设定的温度报警下限
        WriteOneChar(0x3f);                //写配置寄存器,格式为0 R1 R0 1,1 1 1 1  //R1R0=00分辨率娄9位,R1R0=11分辨率为12位  */
    } else if(1==num) {
//	delay_18B20(80);       // this message is wery important
        Init_DS18B20();
        WriteOneChar(0xCC);            // 跳过读序号列号的操作
        WriteOneChar(0x44);         // 启动温度转换
    } else if(2==num) {
//	delay_18B20(80);       // this message is wery important
        Init_DS18B20();
        WriteOneChar(0xCC);         //跳过读序号列号的操作
        WriteOneChar(0xBE);         //读取温度寄存器等(共可读9个寄存器) 前两个就是温度
    } else if(3==num) {

//	delay_18B20(80);
        low_byte=ReadOneChar();            //读取温度值低位
        high_byte=ReadOneChar();                   //读取温度值高位
        num=0;
        return ;
    }
    num++;
}
Exemple #2
0
float DS18B20_Temperature(void)
{
    BYTE flag = 0,i = 0;
    BYTE a[10];
    float temp = 0.0f;

    flag = Init_DS18B20();
    if (flag == 0x00)
        return -9999;
    DS18B20_WriteByte(DS18B20_SkipROM);
    DS18B20_WriteByte(DS18B20_ConvertTemp);

    flag = Init_DS18B20();
    if (flag == 0x00)
        return -9999;

    DS18B20_WriteByte(DS18B20_SkipROM);
    DS18B20_WriteByte(DS18B20_ReadSCR);
    
    for(i = 0;i < 9;i++)
        a[i]  = DS18B20_ReadByte();
 
    if(CRC(a,9) == 0)
	{
		if(a[1]&0xf0)
	        temp= 0-(0xffff-(unsigned short)((a[1]<<8)+a[0])+1)*0.0625;
	    else
	        temp=((unsigned short)(a[1]<<8)+a[0])*0.0625;
 	}
	else
		temp = 9999;
    return temp;
}
Exemple #3
0
/*------------------------------------------------
                    读取温度
------------------------------------------------*/
unsigned int ReadTemperature(void)
{


unsigned char a=0;
unsigned int b=0;
unsigned int t=0;
Init_DS18B20();
WriteOneChar(0xCC); // 跳过读序号列号的操作
WriteOneChar(0x44); // 启动温度转换
DelayUs2x(1000);
Init_DS18B20();
WriteOneChar(0xCC); //跳过读序号列号的操作 
WriteOneChar(0xBE); //读取温度寄存器等(共可读9个寄存器) 前两个就是温度
a=ReadOneChar();   //低位
b=ReadOneChar();   //高位

b<<=8;
t=a+b;

t=(float)t*0.625; //t为实际温度的十倍,这样方便取小数点后一位

 return t;
  



}
void Write_Temperature_alarm(void)
{
    Init_DS18B20();
  
    WriteOneChar(0xCC);           //跳过读序号列号的操作 
    WriteOneChar(0x4e);           //将设定的温度报警值写入 DS18B20
	WriteOneChar(temp_alarm[0]);  //写TH
	WriteOneChar(temp_alarm[1]);  //写TL
    WriteOneChar(0x7f);           //12位精确度
 
	Init_DS18B20();
    WriteOneChar(0xCC);           //跳过读序号列号的操作 
    WriteOneChar(0x48);           //把暂存器里的温度报警值拷贝到EEROM
}
void Config18b20 (void)  //重新配置报警限定值和分辨率
{
     Init_DS18B20();
     WriteOneChar(0xcc);  //skip rom
     WriteOneChar(0x4e);  //write scratchpad
     WriteOneChar(0xff);  //上限
     WriteOneChar(0x00);  //下限
     WriteOneChar(0x7f);     //set 12 bit
     Init_DS18B20();
     WriteOneChar(0xcc);  //skip rom
     WriteOneChar(0x48);  //保存设定值
     Init_DS18B20();
     WriteOneChar(0xcc);  //skip rom
     WriteOneChar(0xb8);  //回调设定值
}
Exemple #6
0
void Init_Hard(void){
    Init_CLK();
    gpio_init();
    externalInterrupt_CcCv_init();
    
    InitDelTim();
    delay_ms(100);
    Init_Beep();
    Init_Timer4();              //FAN_PWM
    Init_Encoder();
    InitAdc();
    Init_DAC_CH1();
    Init_DAC_CH2();
    Init_DS18B20();
    Init_PVD();
    Init_EXTI1();
    Init_SPI2();
    uart_init(USART3, BR38400);
    lcd_init ();                //Глючная инициализация
    lcd_init ();
    lcd_init ();
    lcd_init ();
    
    timMeasInit();  //DEBUG
}
void Read_RomCord(void)
{
   unsigned char j;
   Init_DS18B20();
  
   WriteOneChar(0x33);          // 读序列码的操作
   for (j = 0; j < 8; j++)
   {
     RomCode[j] = ReadOneChar() ; 
   }
}
Exemple #8
0
//读取温度
unsigned char ReadTemperature(void)
{
	unsigned char a=0;
	unsigned char b=0;
	unsigned char t=0;
	//float tt=0;
	Init_DS18B20();
	WriteOneChar(0xCC); // 跳过读序号列号的操作
	WriteOneChar(0x44); // 启动温度转换
	delay_18B20(2000);
	Init_DS18B20();
	WriteOneChar(0xCC); //跳过读序号列号的操作 
	WriteOneChar(0xBE); //读取温度寄存器等(共可读9个寄存器) 前两个就是温度
	a=ReadOneChar();
	b=ReadOneChar();
	
	b<<=4;
	b+=(a&0xf0)>>4;
	t=b;
	//tt=t*0.0625;
	//t= tt*10+0.5; //放大10倍输出并四舍五入
	return(t);
}
Exemple #9
0
/*****读取温度*****/
int ReadTemperature(void)
{
  unsigned char a=0;
  unsigned char b=0;
  unsigned int t=0;

  t=Init_DS18B20();
  if(t) return Real_temp;
  WriteOneChar(0xCC);  //跳过读序号列号的操作
  WriteOneChar(0x44);  //启动温度转换
//  delay(10);
  t=Init_DS18B20();
  if(t) return Real_temp;
  WriteOneChar(0xCC);  //跳过读序号列号的操作
  WriteOneChar(0xBE);  //读取温度寄存器
  a=ReadOneChar();     //读低8位
  b=ReadOneChar();     //读高8位
  t=b;
  t<<=8;
  t=t|a;
  if(t<=0||t>0x900) return Real_temp;
  return(t);
}
/******************************************************
函数名称:int ReadOneTemperature(void)
返回值:int t
参数: 无
作用:读温度值
*******************************************************/
int get_temp(void) ////////***读取温度值***********///// 每次读写均要先复位
{ 
uchar a=0;
uchar b=0;
uint16 t=0;
Init_DS18B20();
WriteOneChar(0xcc);//发跳过ROM命令
WriteOneChar(0x44);//发读开始转换命令
Init_DS18B20();
WriteOneChar(0xcc);//发跳过ROM命令
WriteOneChar(0xbe);//读寄存器,共九字节,前两字节为转换值
a=ReadOneChar(); //a存低字节
b=ReadOneChar(); //b存高字节
t=((b<<8)|a);
return((t>>4)*10+table_tempfh[t&0x0f]);
/*
t=b;
t<<=8;//高字节转换为10进制
t=t|a;
tep=t*0.0625;//转换精度为0.0625/LSB
t=tep*10+0.5;//保留1位小数并四舍五入****后面除10还原正确温度值)
*/
}