#include <reg51.h>
#include \"AscLed.h\"
#include <intrins.h>
#include <stdio.h>
//** ******************************************************
#define Seck (500/TK) //Factor of the main program in 1 second
#define OffLed (Seck*5*60) //Automatic shutdown of the Time 5 minutes!
//********************************************************
#if (FHz==0)
#define NOP_2uS_nop_()
#else
#define NOP_2uS_nop_();_nop_()
#endif
//**************************************
#define SkipK 0xcc //skip command
# define ConvertK 0x44 //convert command
#define RdDs18b20K 0xbe //read temperature command
//*******************************************
extern LedOut (void);
//*************************************************
sbit PNP1=P3^4;
sbit PNP2=P3^5;
sbit BEEP=P3^2;
//***********************************
#defineDQ PNP2 //original PNP2 BEEP
//***********************************
static unsigned char Power=0;
//************************************
union{
unsigned char Temp[2]; //single byte temperature
unsigned int Tt; //2-byte temperature
}T;
//***********************************************
typedef struct{
unsigned char Flag; //positive flag 0; 1==" negative
unsigned char WenDu; //temperature integer
unsigned int WenDuDot; //temperature decimals enlarged by 10,000
}WENDU;
//**************** *******************************
WENDU WenDu;
unsigned char LedBuf[3];
//----------------------------------
// Function: 10us level delay
// n=1===> 6Mhz=14uS 12MHz=7uS
//----------------------------------
void Delay10us(unsigned char n){
do{
#if (FHz==1)
NOP_2uS;NOP_2uS;
#endif
}while(--n);
}
//--------------------------------- --
//Function: write 18B20
//-----------------------------------
void Write_18B20(unsigned char n){
unsigned char i;
for(i=0;i<8;i++){
DQ=0;
Delay10us(1);//delay 13us or so
DQ=n & 0x01;
n=n>>1;
Delay10us(5);//delay 50us or more
DQ=1;
}
}
//------------------------------------
// Function: Read 18B20
//----------------------- -------------
unsigned char Read_18B20(void){
unsigned char i;
unsigned char temp;
for(i=0;i<8;i++){
temp=temp>>1;
DQ=0;
NOP_2uS;//delay 1us
DQ=1;
NOP_2uS;NOP_2uS;//delay 5us
if(DQ==0){
temp=temp&. amp;0x7F;
}else{
temp=temp|0x80;
}
Delay10us(5);//delay 40us
DQ=1;
}
return temp;
}
//-----------------------------------
void Init (void){
DQ=0;
Delay10us(45);//delay 500us
DQ=1;
Delay10us(9);//delay 90us
if(DQ){ //0001 1111b=1f
Power =0; //fail 0
}else{
Power++;
DQ=1;
}
}
< p>//----------------------------------void Skip(void){
Write_18B20(SkipK);
Power++;
}
//------------ ----------------------
void Convert (void){
Write_18B20(ConvertK);
Power++;
}
// ______________________________________
void Get_Ds18b20L (void){
T.Temp[1]=Read_18B20(); //Read the low bit
Power++;
}
//______________________________________
void Get_Ds18b20H (void){
T.Temp[0]=Read_18B20(); //read high bit
Power++;
}
//------------------------------------
// Normalize to floating point
// sssss111;11110000
// sssss111;1111(0.5,0.25,0.125, 0.0625)
// ------------------------------------
void ReadTemp (void){
unsigned char i;
unsigned intF1=0;
char j=1;
code int Code_F[]={6250,1250,2500,5000};
WenDu.Flag=0;
if (T.Temp[0] >0x80){ //negative temperature
T.Tt =~T.Tt+1; // Invert +1 = Source?+Sign S
WenDu.Flag=-1;
}
T.Tt <<= 4; // Shift left by 4 bits
WenDu.WenDu=T.Temp[0]; // Temperature integer
//****************** ********************************
T.Temp[1]>>=4;
//---------------------------
for (i=0;i<4;i++){ //calculate decimal places< /p>
F1 +=(T.Temp[1] & 0x01)*Code_F;
T.Temp[1]>>=1;
}
WenDu.WenDuDot=F1; //Temperature decimal
Power=0;
}
//----------------------------------
void Delay1S (void){
static unsigned int i=0;
if (++i==Seck) {i=0ower++;}
}
//----------------------------------
void ReadDo (void){
Write_18B20(RdDs18b20K);
Power++;
}
< p>/**********************************
Function Pointer Definition
***********************************/
code void (code *SubTemp[])()={
Init,Skip,Convert,Delay1S,Init,Skip,ReadDo,Get_Ds18b20L,
Get_Ds18b20H,ReadTemp
};
//*********************** ***************
void GetTemp(void){
(*SubTemp[Power])();
}
//---------------------------------------------- -----
/// Display the temperature with the decimal point enlarged by 10000.
void GetBcd(void){
LedBuf[0]=WenDu.WenDu / 10;
LedBuf[1]=WenDu.WenDu % 10 +DotK;
< p> LedBuf[2]=(WenDu.WenDuDot/1000)%10;if(LedBuf[0]==0)LedBuf[0]=Black;
if(WenDu.Flag==0) return;
if(LedBuf[0] ! =Black){
LedBuf[2]=LedBuf[1];
LedBuf[1]=LedBuf[0];
LedBuf[0]=Led_Pol; //'-'
}else{
LedBuf[0]=Led_Pol. //'-'
}
}
/*
//---------------------------------------------------
void JbDelay (void){
static long i;
if (++i>=OffLed){
P1=0xff;
P2=0xff;
PCON=0x02;
}
}
*/
/****************** ***********************************
Main program start
1:2002_10_1 design, using DS18B20 measurement
2:Using function array to read DS18B20.LED digital tube display is normal!
3:Change FHz can work with 6,12MHz!
******************************************************/
code unsigned char Stop[3] _at_ 0x3b;
void main (void){
P1=0xff;
WenDu.WenDu=0;
while (1){
GetTemp();
GetBcd();
// JbDelay();LedOut();
}
}< /p>
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Uploaded on 2009-10-21 23:21
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