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標(biāo)題: ALIENTEK MINISTM32 DS18B20數(shù)字溫度傳感器實驗 [打印本頁]

作者: hsw2017 時間: 2018-1-1 16:16
標(biāo)題: ALIENTEK MINISTM32 DS18B20數(shù)字溫度傳感器實驗
#include "ds18b20.h"
#include "delay.h"
void DS18B20_Rst(void)
{
DS18B20_IO_OUT(); //SET PA0 OUTPUT
DS18B20_DQ_OUT=0; //à-μíDQ
delay_us(750); //à-μí750us
DS18B20_DQ_OUT=1; //DQ=1
delay_us(15);    //15US
}
//μè′yDS18B20μÄ»Øó|
//·μ»Ø1:Î′¼ì2aμ½DS18B20μÄ′æÔú
//·μ»Ø0:′æÔú
u8 DS18B20_Check(void)
{
u8 retry=0;
DS18B20_IO_IN();//SET PA0 INPUT
while (DS18B20_DQ_IN&&retry<200)
{
retry++;
delay_us(1);
};
if(retry>=200)return 1;
else retry=0;
while (!DS18B20_DQ_IN&&retry<240)
{
retry++;
delay_us(1);
};
if(retry>=240)return 1;
return 0;
}
//′óDS18B20¶áè¡ò»¸öÎ»
//·μ»ØÖμ￡o1/0
u8 DS18B20_Read_Bit(void)    // read one bit
{
u8 data;
DS18B20_IO_OUT();//SET PA0 OUTPUT
DS18B20_DQ_OUT=0;
delay_us(2);
DS18B20_DQ_OUT=1;
DS18B20_IO_IN();//SET PA0 INPUT
delay_us(12);
if(DS18B20_DQ_IN)data=1;
else data=0;
delay_us(50);
return data;
}
//′óDS18B20¶áè¡ò»¸ö×Ö½ú
//·μ»ØÖμ￡o¶áμ½μÄêy¾Y
u8 DS18B20_Read_Byte(void) // read one byte
{
u8 i,j,dat;
dat=0;
for (i=1;i<=8;i++)
{
      j=DS18B20_Read_Bit();
      dat=(j<<7)|(dat>>1);
}
return dat;
}
//D′ò»¸ö×Ö½úμ½DS18B20
//dat￡oòaD′èëμÄ×Ö½ú
void DS18B20_Write_Byte(u8 dat)
{
u8 j;
u8 testb;
DS18B20_IO_OUT();//SET PA0 OUTPUT;
for (j=1;j<=8;j++)
{
      testb=dat&0x01;
      dat=dat>>1;
      if (testb)
      {
         DS18B20_DQ_OUT=0;// Write 1
         delay_us(2);
         DS18B20_DQ_OUT=1;
         delay_us(60);
      }
      else
      {
         DS18B20_DQ_OUT=0;// Write 0
         delay_us(60);
         DS18B20_DQ_OUT=1;
         delay_us(2);
      }
}
}
//¿aê¼ÎÂ¶è×a»»
void DS18B20_Start(void)// ds1820 start convert
{
DS18B20_Rst();
DS18B20_Check();
DS18B20_Write_Byte(0xcc);// skip rom
DS18B20_Write_Byte(0x44);// convert
}


u8 DS18B20_Init(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);    //ê1ÄüPORTA¿úê±Öó

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PORTA0 íÆíìêä3ö
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_SetBits(GPIOA,GPIO_Pin_0); //êä3ö1

DS18B20_Rst();

return DS18B20_Check();
}
short DS18B20_Get_Temp(void)
{
u8 temp;
u8 TL,TH;
short tem;
DS18B20_Start ();                   // ds1820 start convert
DS18B20_Rst();
DS18B20_Check();
DS18B20_Write_Byte(0xcc);// skip rom
DS18B20_Write_Byte(0xbe);// convert
TL=DS18B20_Read_Byte(); // LSB
TH=DS18B20_Read_Byte(); // MSB

if(TH>7)
{
      TH=~TH;
      TL=~TL;
      temp=0;
}else temp=1;
tem=TH;
tem<<=8;
tem+=TL;
tem=(float)tem*0.625;//×a»»
if(temp)return tem;
else return -tem;
}

ALIENTEK MINISTM32 DS18B20數(shù)字溫度傳感器實驗.zip

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