new.c.bak

压缩包中包括多个常用的汇编

#include <reg52.h>

sbit DQ =P0^3;


void delay(unsigned int i)
{
 while(i--);
}

void Init_DS18B20(void)
{
 unsigned char x=0;
 DQ = 1;
 delay(8);
 DQ = 0;
 delay(80);
 DQ = 1;
 delay(14);
 x=DQ;
 delay(20);
}


unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for (i=8;i>0;i--)
 {
  DQ = 0;
  dat>>=1;
  DQ = 1;
  if(DQ)
   dat|=0x80;
  delay(4);
 }
 return(dat);
}


void WriteOneChar(unsigned char dat)
{
 unsigned char i=0;
 for (i=8; i>0; i--)
 {
  DQ = 0;
  DQ = dat&0x01;
  delay(5);
  DQ = 1;
  dat>>=1;
 }

}


unsigned char ReadTemperature(void)
{
unsigned char a=0;
unsigned char b=0;
unsigned int t=0;
float tt=0;
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0x44);
Init_DS18B20();
WriteOneChar(0xCC);
WriteOneChar(0xBE);
a=ReadOneChar();
b=ReadOneChar();
t=b;
t<<=8;
t=t|a;
tt=t*0.0625;

return(t);
}

main()
{
 unsigned char i=0;
  while(1)
  {
   i=ReadTemperature();//读温度
     delay(5);
  }
}