msp430单片机的ds18b20测温度c程序

时间：11-27 来源：互联网点击：

#include
#define DS18B20_DIRP2DIR
#define DS18B20_INP2IN
#define DS18B20_OUTP2OUT

#define DS18B20_DQBIT3//定义DS18B20的接口
#define DS18B20_DQ_2BIT4//定义另一个DS18B20的接口

// DS18B20 ROM命令宏定义
#define ReadRom0x33
#define MatchRom0x55
#define SearchRom0xf0
#define AlertSearch0xec
#define CopyScratchpad0x48
#define SkipRom0xcc
#define ReadPower0xb4

// DS18B20 功能命令宏定义
#define ConvertTemperature0x44
#define ReadScratchpad0xbe
#define WriteScratchpad0x4e
#define RecallE0xb8

#define SMCLK2000//(KHz)用于系统延时

// 温度的十进制编码(查表用)
unsigned char decimalH[16]={00,06,12,18,25,31,37,43,50,56,62,68,75,81,87,93};
unsigned char decimalL[16]={00,25,50,75,00,25,50,75,00,25,50,75,00,25,50,75};

// 变量定义
unsigned char GetScratchpad[9];
unsigned char GetScratchpad_2[9];
float ResultTemperatureH;//温度的整数部分
float ResultTemperatureLH;//温度的小数部分(高位)
float ResultTemperatureLL;//温度的小数部分(低位)
float ResultTemperatureH_2;//温度的整数部分
float ResultTemperatureLH_2;//温度的小数部分(高位)
float ResultTemperatureLL_2;//温度的小数部分(低位)
float ResultTemperature;//温度的真实值
float ResultTemperature_2;//温度的真实值
float Temperaturefromtwo;//温度的真实值差
float OilPercentage;//油相含率

void DS18B20_WriteBit(unsigned char oww_dat);
void DS18B20_WriteBit_2(unsigned char oww_dat);
void DS18B20_WriteByte(unsigned char oww_dat);
void DS18B20_WriteByte_2(unsigned char oww_dat);
void DS18B20_ReadTemp(void);
void DS18B20_ReadTemp_2(void);
unsigned char DS18B20_Init(void);
unsigned char DS18B20_Init_2(void);
unsigned char DS18B20_ReadBit(void);
unsigned char DS18B20_ReadBit_2(void);
unsigned char DS18B20_ReadByte(void);
unsigned char DS18B20_ReadByte_2(void);
void Delay10us(void);
void DelayX10us(unsigned char x10us);

void main(void) {
volatile unsigned int i,j;
WDTCTL = WDTPW + WDTHOLD;//停止看门狗

BCSCTL1 &= ~XT2OFF;//XT2 = HF XTAL
do {
IFG1 &= ~OFIFG;//Clear OSCFault flag
for (i=0xFF;i>0;i--);//Time for flag to set
}while((IFG1&OFIFG));//OSCFault flag still set?
BCSCTL2 |= (SELM1 + SELS);//MCLK = SMCLK = XT2

DS18B20_Init();//初始化DS18B20
DS18B20_Init_2();//初始化DS18B20.2

//Z7289_Init();

while(1) {
DS18B20_ReadTemp();
i=ResultTemperatureH/10;
j=ResultTemperatureH-(i*10);
//Z7289_Show(7,1,i);
//Z7289_Show(6,1,j);
//Z7289_Show(5,1,0x0C);
i=ResultTemperatureLH/10;
j=ResultTemperatureLH-(i*10);
//Z7289_Show(4,1,i);
//Z7289_Show(3,1,j);
i=ResultTemperatureLL/10;
j=ResultTemperatureLL-(i*10);
//Z7289_Show(2,1,i);
//Z7289_Show(1,1,j);
ResultTemperature=ResultTemperatureH+ResultTemperatureLH/100+ResultTemperatureLL/10000;
ResultTemperature_2=ResultTemperatureH_2+ResultTemperatureLH_2/100+ResultTemperatureLL_2/10000;
Temperaturefromtwo=ResultTemperature_2-ResultTemperature;
OilPercentage=1.6939-0.9260/Temperaturefromtwo;
}
}

// 功能函数定义

unsigned char DS18B20_Init(void){
unsigned char result;
DS18B20_DIR |= DS18B20_DQ;// ow output
DS18B20_OUT &= ~DS18B20_DQ;// DS18B20_DQ=0;
DelayX10us(48);// Bus master pulling low 480us minimum;
DS18B20_OUT |= DS18B20_DQ;// DS18B20_DQ=1;
DelayX10us(6);// Resister pull up 15-60us;
DS18B20_DIR &= ~DS18B20_DQ;// ow input
result = DS18B20_IN & DS18B20_DQ;
DS18B20_DIR |= DS18B20_DQ;// ow output
DelayX10us(48);// End of timeslot total 480us;
return(result);// any 1 wire device ?result:=1 no devide; ?result:=0 have device;
}//Intialization the 1-wire devices;

unsigned char DS18B20_Init_2(void){
unsigned char result;
DS18B20_DIR |= DS18B20_DQ_2;// ow output
DS18B20_OUT &= ~DS18B20_DQ_2;// DS18B20_DQ=0;
DelayX10us(48);// Bus master pulling low 480us minimum;
DS18B20_OUT |= DS18B20_DQ_2;// DS18B20_DQ=1;
DelayX10us(6);// Resister pull up 15-60us;
DS18B20_DIR &= ~DS18B20_DQ_2;// ow input
result = DS18B20_IN & DS18B20_DQ_2;
DS18B20_DIR |= DS18B20_DQ_2;// ow output
DelayX10us(48);// End of timeslot total 480us;
return(result);// any 1 wire device ?result:=1 no devide; ?result:=0 have device;
}//Intialization the 1-wire devices;

unsigned char DS18B20_ReadBit(void){
unsigned char result;
DS18B20_DIR |= DS18B20_DQ;// ow output
DS18B20_OUT &= ~DS18B20_DQ;// DS18B20_DQ=0;
_NOP();// Start of timeslot;
DS18B20_OUT |= DS18B20_DQ;// DS18B20_DQ=1;
_NOP();_NOP();_NOP();_NOP();
// Wait from the start;
DS18B20_DIR &= ~DS18B20_DQ;// ow input
result = DS18B20_IN & DS18B20_DQ;
DS18B20_DIR |= DS18B20_DQ;// ow output
return(result);// return the result of the 1-wire devide;
}//Read a bit on the 1-wire bus;

unsigned char DS18B20_ReadBit_2(void){
unsigned char result;
DS18B20_DIR |= DS18B20_DQ_2;// ow output
DS18B20_OUT &= ~DS18B20_DQ_2;// DS18B20_DQ=0;
_NOP();// Start of timeslot;
DS18B20_OUT |= DS18B20_DQ_2;// DS18B20_DQ=1;
_NOP();_NOP();_NOP();_NOP();
// Wait from the start;
DS18B20_DIR &= ~DS18B20_DQ_2;// ow input
result = DS18B20_IN & DS18B20_DQ_2;
DS18B20_DIR |= DS18B20_DQ_2;// ow output
return(result);// return the result of the 1-wire devide;
}//Read a bit on the 1-wire bus;

void DS18B20_WriteBit(unsigned char oww_dat){
DS18B20_DIR |= DS18B20_DQ;// ow output
DS18B20_OUT &= ~DS18B20_DQ;// DS18B20_DQ=0;
if (1 == oww_dat)
DS18B20_OUT |= DS18B20_DQ;// DS18B20_DQ=1;
DelayX10us(10);// Remain the state for 100us;
DS18B20_OUT |= DS18B20_DQ;// DS18B20_DQ=1;
}//Write a bit to the 1-wire bus;

void DS18B20_WriteBit_2(unsigned char oww_dat){
DS18B20_DIR |= DS18B20_DQ_2;// ow output
DS18B20_OUT &= ~DS18B20_DQ_2;// DS18B20_DQ=0;
if (1 == oww_dat)
DS18B20_OUT |= DS18B20_DQ_2;// DS18B20_DQ=1;
DelayX10us(10);// Remain the state for 100us;
DS18B20_OUT |= DS18B20_DQ_2;// DS18B20_DQ=1;
}//Write a bit to the 1-wire bus;

unsigned char DS18B20_ReadByte(void){
unsigned char i;
unsigned char result=0;
for(i = 0; i8; i++){
if(DS18B20_ReadBit())
result |= 0x01 < i;
DelayX10us(12);// ??
}
return(result);// return the result of the 1-wire device;
}//Read a byte from the 1-wire bus;

unsigned char DS18B20_ReadByte_2(void){
unsigned char i;
unsigned char result=0;
for(i = 0; i8; i++){
if(DS18B20_ReadBit_2())
result |= 0x01 < i;
DelayX10us(12);// ??
}
return(result);// return the result of the 1-wire device;
}//Read a byte from the 1-wire bus;

void DS18B20_WriteByte(unsigned char oww_dat){
unsigned char i,temp;
for(i = 0; i8; i++){
temp = oww_dat >> i;
temp &= 0x01;
DS18B20_WriteBit(temp);
}
DelayX10us(7);// ??
}//Write a byte to the 1-wire bus;

void DS18B20_WriteByte_2(unsigned char oww_dat){
unsigned char i,temp;
for(i = 0; i8; i++){
temp = oww_dat >> i;
temp &= 0x01;
DS18B20_WriteBit_2(temp);
}
DelayX10us(7);// ??
}//Write a byte to the 1-wire bus;

void DS18B20_ReadTemp(void)
{unsigned char tempH,tempL,tempH_2,tempL_2;
DS18B20_Init();
DS18B20_Init_2();
DS18B20_WriteByte(SkipRom);
_NOP();
DS18B20_WriteByte_2(SkipRom);
_NOP();
//There is just one DS1820 on the bus;
DS18B20_WriteByte(ConvertTemperature);
DelayX10us(10);
DS18B20_WriteByte_2(ConvertTemperature);
DelayX10us(10);
//Start to convert temperature;
DS18B20_Init();
DS18B20_Init_2();
DS18B20_WriteByte(SkipRom);
_NOP();
DS18B20_WriteByte_2(SkipRom);
_NOP();
DS18B20_WriteByte(ReadScratchpad);
DS18B20_WriteByte_2(ReadScratchpad);
GetScratchpad[0]=DS18B20_ReadByte();
//Master samples the LSB temperature from the scratchpad;
GetScratchpad[1]=DS18B20_ReadByte();
//Master samples the MSB temperature from the scratchpad;
GetScratchpad[2]=DS18B20_ReadByte();
//Master samples the Th register or userbyte1 from the scratchpad;
GetScratchpad[3]=DS18B20_ReadByte();
//Master samples the Tl register or userbyte0 from the scratchpad;
GetScratchpad[4]=DS18B20_ReadByte();
//Master samples the configuration register from the scratchpad;
GetScratchpad[5]=DS18B20_ReadByte();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad[6]=DS18B20_ReadByte();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad[7]=DS18B20_ReadByte();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad[8]=DS18B20_ReadByte();
//Master samples the CRC from the scratchpad;
tempH=(GetScratchpad[1] < 4) | (GetScratchpad[0] >> 4);
tempL=(GetScratchpad[0] & 0x0f);
DS18B20_Init();

GetScratchpad_2[0]=DS18B20_ReadByte_2();
//Master samples the LSB temperature from the scratchpad;
GetScratchpad_2[1]=DS18B20_ReadByte_2();
//Master samples the MSB temperature from the scratchpad;
GetScratchpad_2[2]=DS18B20_ReadByte_2();
//Master samples the Th register or userbyte1 from the scratchpad;
GetScratchpad_2[3]=DS18B20_ReadByte_2();
//Master samples the Tl register or userbyte0 from the scratchpad;
GetScratchpad_2[4]=DS18B20_ReadByte_2();
//Master samples the configuration register from the scratchpad;
GetScratchpad_2[5]=DS18B20_ReadByte_2();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad_2[6]=DS18B20_ReadByte_2();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad_2[7]=DS18B20_ReadByte_2();
//Master samples the reservedbyte from the scratchpad;
GetScratchpad_2[8]=DS18B20_ReadByte_2();
//Master samples the CRC from the scratchpad;
tempH_2=(GetScratchpad_2[1] < 4) | (GetScratchpad_2[0] >> 4);
tempL_2=(GetScratchpad_2[0] & 0x0f);
DS18B20_Init_2();
//Issue a reset to terminate left parts;
//if(tempH & 0x80)
//{ tempH=~tempH;
//tempL=~tempL+1;
//ResultSignal=1;
////Negative temperature;
//}
ResultTemperatureH=tempH;
ResultTemperatureLL=decimalL[tempL];
ResultTemperatureLH=decimalH[tempL];

ResultTemperatureH_2=tempH_2;
ResultTemperatureLL_2=decimalL[tempL_2];
ResultTemperatureLH_2=decimalH[tempL_2];
//Result of temperature;
}//Read the byte0 and byte1 from scratchpad;

void Delay10us(void){
unsigned char i;
for (i=0; i<(SMCLK/500-3); i++);
}

//Time is accurately !!
void DelayX10us(unsigned char x10us){
unsigned int i;
for (i=0; i
Delay10us
}

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