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#include <reg52.H>
#include <intrins.H>
#include <math.H>
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
sbit lcdrs=P3^5;
sbit lcden=P3^4;
void delayUs()
{
_nop_();
}
void delayMs(uint a)
{
uint i,j;
for(i=a;i>0;i--)
for(j=100;j>0;j--);
}
void writeComm(uchar comm)
{
lcdrs=0;
P0=comm;
lcden = 1;
delayUs();
lcden = 0;
delayMs(1);
}
//寫數據:RS=1, RW=0;
void writeData(uchar dat)
{
lcdrs=1;
P0=dat;
lcden=1;
delayUs();
lcden=0;
delayMs(1);
}
void init()
{
dula=wela=0;
writeComm(0x38);
writeComm(0x0c);
writeComm(0x06);
writeComm(0x01);
}
void writeString(uchar*str, uchar length)
{
uchar i;
for(i=0;i<length;i++)
{
writeData(str[i]);
}
}
/**//*****************************DS18B20*******************************/
sbit ds = P2^2;
void dsInit()
{
unsigned int i;
ds=0;
i=100;
while(i>0) i--;
ds=1;
i=4;
while(i>0) i--;
}
void dsWait()
{
unsigned int i;
while(ds);
while(~ds);
i=4;
while(i>0) i--;
}
bit readBit()
{
unsigned int i;
bit b;
ds=0;
i++;
ds=1;
i++; i++;
b=ds;
i=8;
while(i>0) i--;
return b;
}
unsigned char readByte()
{
unsigned int i;
unsigned char j, dat;
dat = 0;
for(i=0; i<8; i++)
{
j = readBit();
dat = (j<<7) | (dat>>1);
}
return dat;
}
void writeByte(unsigned char dat)
{
unsigned int i;
unsigned char j;
bit b;
for(j=0; j<8; j++)
{
b = dat & 0x01;
dat >>= 1;
if(b)
{
ds=0; i++; i++;
ds=1;
i=8; while(i>0) i--;
}
else
{
ds=0;
i=8; while(i>0) i--;
ds=1;
i++; i++;
}
}
}
void sendChangeCmd()
{
dsInit();
dsWait();
delayMs(1);
writeByte(0xcc);
writeByte(0x44);
}
void sendReadCmd()
{
dsInit();
dsWait();
delayMs(1);
writeByte(0xcc);
writeByte(0xbe);
}
int getTmpValue()
{
unsigned int tmpvalue;
int value;
float t;
unsigned char low, high;
sendReadCmd();
low=readByte();
high=readByte();
tmpvalue=high;
tmpvalue<<=8;
tmpvalue |=low;
value=tmpvalue;
\
t = value * 0.0625;
\
value = t * 100 + (value > 0 ? 0.5 : -0.5); //大于0加0.5, 小于0減0.5
return value;
}
void display(int v)
{
unsigned char count;
unsigned char datas[] = {0, 0, 0, 0, 0};
unsigned int tmp = abs(v);
datas[0] = tmp / 10000;
datas[1] = tmp % 10000 / 1000;
datas[2] = tmp % 1000 / 100;
datas[3] = tmp % 100 / 10;
datas[4] = tmp % 10;
writeComm(0xc0+3);
if(v < 0)
{
writeString("- ", 2);
}
else
{
writeString("+ ", 2);
}
if(datas[0] != 0)
{
writeData('0'+datas[0]);
}
for(count = 1; count != 5; count++)
{
writeData('0'+datas[count]);
if(count == 2)
{
writeData('.');
}
}
}
/**//*****************************DS18B20*******************************/
void main()
{
uchar table[] = " temperature: ";
sendChangeCmd();
init();
writeComm(0x80);
writeString(table, 16);
while(1)
{
delayMs(1000); //溫度轉換時間需要750ms以上
writeComm(0xc0);
display(getTmpValue());
sendChangeCmd();
}
}
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