M054LBN

只看该作者 · 2015-3-30 16:22

谁有M054LBN单片机DS18B20的程序啊

1万 · 2015-3-30 21:50

楼主发帖发重复了吗？

1万 · 2015-3-30 21:51

建议根据时序图自己写一个，关键是延时写对就行了，顺序不容易搞错

只看该作者 · 2015-3-31 10:38

598330983 发表于 2015-3-30 21:51
建议根据时序图自己写一个，关键是延时写对就行了，顺序不容易搞错

结果就是不对
//================================================================
void DS18b20_Rest(void)
{
//_GPIO_ENABLE_DIGITAL_PATH(P3, 4);
_GPIO_SET_PIN_MODE(P3, 4, GPIO_PMD_OUTPUT);
P34 = 1;
SYS_SysTickDelay(2);
P34 = 0;
SYS_SysTickDelay(750);
P34 = 1;
SYS_SysTickDelay(15);
}
//================================================================
uchar DS18B20_Check(void)
{
uchar rety = 0;

//_GPIO_ENABLE_DIGITAL_PATH(P3, 4);
_GPIO_SET_PIN_MODE(P3, 4, GPIO_PMD_INPUT);
while(P34&&rety<200)
{
      rety++;
      SYS_SysTickDelay(1);
};
if(rety>=200)
      return 1;
else
      rety = 0;
while(P34&&rety<240)
{
      rety++;
      SYS_SysTickDelay(1);
};
if(rety>=240)
      return 1;
return 0;

}
//================================================================
void Write_One_Byte(uchar dat)
{
uchar i = 0;
uchar whicebit;

//_GPIO_ENABLE_DIGITAL_PATH(P3, 4);
_GPIO_SET_PIN_MODE(P3, 4, GPIO_PMD_OUTPUT);
for(i=0;i<8;i++)
{
      whicebit = dat&0x01;
dat>>=1;
      if(whicebit)
      {
         P34 = 0;
         SYS_SysTickDelay(2);
         P34 = 1;
         SYS_SysTickDelay(60);
      }
      else
      {
         P34 = 0;
         SYS_SysTickDelay(60);
         P34 = 1;
         SYS_SysTickDelay(2);
      }
}
P34 = 1;
}
//=====================================================================
uchar Read_One_Bit()
{
uchar dat = 0;

//_GPIO_ENABLE_DIGITAL_PATH(P3, 4);
_GPIO_SET_PIN_MODE(P3, 4, GPIO_PMD_OUTPUT);
P34 = 1;
SYS_SysTickDelay(2);
P34 = 0;
SYS_SysTickDelay(2);
P34 = 1;

//_GPIO_ENABLE_DIGITAL_PATH(P3, 4);
_GPIO_SET_PIN_MODE(P3, 4, GPIO_PMD_INPUT);
SYS_SysTickDelay(12);
if(P34)
      dat = 1;
else
      dat = 0;
SYS_SysTickDelay(60);
return (dat);
}
//================================================================
uchar DS18B20_Read_Byte(void)
{
uchar i,j,dat;
dat = 0;
for (i=0;i<8;i++)
{
      j=Read_One_Bit();
      dat=(j<<i)|dat;
}
return dat;
}
//===============================================================
void DS18B20_Star_Com(void)
{
DS18b20_Rest();
DS18B20_Check();
Write_One_Byte(0xcc);
Write_One_Byte(0x44);
}
//===============================================================
void DS18B20_Read_Com(void)
{
DS18b20_Rest();
DS18B20_Check();
Write_One_Byte(0xcc);
Write_One_Byte(0xbe);
}
//===============================================================
void Get_Tmp(void)
{
float temp_map;
uchar temp_l,temp_h,flag;

DS18B20_Star_Com();
DS18B20_Read_Com();

temp_l = DS18B20_Read_Byte();
temp_h = DS18B20_Read_Byte();
// if(temp_h>7)
// {
//       temp_h = ~temp_h;
//       temp_l = ~temp_l;
//       flag = 0;
// }
// else
//       flag = 1;
temp = temp_h;
temp = temp<<8;
temp = temp|temp_l;
temp_map=temp*0.0625;
temp = (uint)(temp_map*10+5);

TX1_buf[0] = temp/256;
TX1_buf[1] = temp%256;
}