代碼如下：
#include"temp.h"
void Delay1ms(uint y)
{
uint x;
for( ; y>0; y--)
{
for(x=110; x>0; x--);
}
}
uchar Ds18b20Init()
{
uchar i;
DSPORT = 0;
i = 70;
while(i--);
DSPORT = 1;
i = 0;
while(DSPORT)
{
Delay1ms(1);
i++;
if(i>5)
{
return 0;
}
}
return 1;
}
void Ds18b20WriteByte(uchar dat)
{
uint i, j;
for(j=0; j<8; j++)
{
DSPORT = 0;
i++;
DSPORT = dat & 0x01;
i=6;
while(i--);
DSPORT = 1;
dat >>= 1;
}
}
uchar Ds18b20ReadByte()
{
uchar byte, bi;
uint i, j;
for(j=8; j>0; j--)
{
DSPORT = 0;
i++;
DSPORT = 1;
i++;
i++;
bi = DSPORT;
byte = (byte >> 1) | (bi << 7);
i = 4;
while(i--);
}
return byte;
}
void Ds18b20ChangTemp()
{
Ds18b20Init();
Delay1ms(1);
Ds18b20WriteByte(0xcc);
Ds18b20WriteByte(0x44);
}
void Ds18b20ReadTempCom()
{
Ds18b20Init();
Delay1ms(1);
Ds18b20WriteByte(0xcc);
Ds18b20WriteByte(0xbe);
}
int Ds18b20ReadTemp()
{
int temp = 0;
uchar tmh, tml;
Ds18b20ChangTemp();
Ds18b20ReadTempCom();
tml = Ds18b20ReadByte();
tmh = Ds18b20ReadByte();
temp = tmh;
temp <<= 8;
temp |= tml;
return temp;
}
歡迎大家學習指正。
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