LetAllLinesOfCodeSpeak

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*Author:JYW

*Time:2019_04_26

*Describe:LetAllLinesOfCodeSpeak

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/*******************************************
*Auther:JYW
*Time:2019_04_26
*Describe:代码练习DS18B20等驱动练习
************************************/

#define DS18B20IO P0_7

unsigned char Ds18b20Init()
{
  unsigned char Status = 0x00;
  unsigned int CON_T = 0;
  unsigned char Flag_1 = 1;
  P0DIR |= 0x80;
  DS18B20IO = 1;
  Delay_us(250);
  DS18B20IO = 0;
  Delay_us(750);
  DS18B20IO = 1;
  P0DIR &=0x7F;
  while((DS18B20IO != 0)&&(Flag_1 == 1))
  {
    CONT_1++;
    Delay_us(10);
    if(CONT_1 > 8000)Flag_1 = 0
     Status = DS18B20IO;
  }
  P0DIR |= 0x80;
  DS18B20IO = 1;
  Delay_us(100);
  return Status;
}

void Ds18b20Write(unsigned char infor)
{
  unsigned int i;
  P0DIR |=0x80; 
  for(i=0;i<8;i++)
  {
    if((infor & 0x01))
    {
      DS18B20IO = 0;
      Delay_us(6);
      DS18B20IO = 1;
      Delay_us(50);
    }
    else 
    {
       DS18B20IO = 0;
       Delay_us(50);
       DS18B20IO = 1;
       Delay_us(6);
    }
    infor >>=1;
  }
}

unsigned char Ds18b20Read(void)
{
  unsigned char Value = 0x00;
  unsigned int i;
  P0DIR |=0x80;
  DS18B20IO = 1;
  Delay_us(10);
  for(i=0;i<8;i++)
  {
     Value >>=1;
     P0DIR |=0x80;
     DS18B20IO = 0;
     Delay_us(3);
     DS18B20IO = 1;
     Delay_us(3);
     P0DIR &= 0x7F;
     if(1== DS18B20IO) Value |=0x80;
     Delay_us(15);
  }
  return Value;
}

unsigned char ReadDs18b20()
{
  unsigned char V1,V2;
  unsigned char temp;
  
  Ds18b20Init();
  Ds18b20Write(0xcc);
  Ds18b20Write(0x44);
  
   Ds18b20Initial();
    Ds18b20Write(0xcc);   
    Ds18b20Write(0xbe); 
    
    V1 = Ds18b20Read();    //低位0110 0000
    V2 = Ds18b20Read();    //高位0010 0011
    temp = ((V1 >> 4)+((V2 & 0x07)*16)); //转换数据 
//     0 011 0110
    return temp;
}