DS18B20 MSP430 C Program

火辣西米秀

DS18B20 MSP430 C Program [Copy link]

DS18B20 MSP430 Program

Program for the DS18B20 temperature sensor on the MSP430 Advanced Development Board

MSP430 Advanced Development Board: >>Click to enter

Welcome to reprint this site program, please indicate that it comes from www.just430.cn

/**************************************************************/
//MSP430 Advanced Developping Components - [DS18B20_430.C]
////DS18B20 One-Wire Digital Thermometer Demos
////->>> http://www.just430.cn ////->>> tel :(0)13500717874 /**************************************************************/ //MSP430 Advanced Developping Components - [DS18B20_430.C] ////DS18B20 One-Wire Digital Thermometer Demos ////->>> http://www.just430.cn
////->>> tel :(0)13500717874
/**************************************************************/
//MSP430 Advanced Developping Components - DS18B20 Single-Wire Digital Thermometer Demo Program
//Hardware Connection:
// MSP430 Broad

DS18B20
// ------------------ ------------------
// | P23 | ------> | DQ |
// ------------------ ------------------
//Current demonstration program function description:
//Loop to detect temperature and save the results in
// ResultSignal temperature sign (0x01 is negative)
// ResultTemperatureH temperature integer
// ResultTemperatureLH temperature decimal (high two digits)
// ResultTemperatureLL temperature decimal (low two digits)
//If the system has a ZLG7289 keyboard display module, the temperature can be displayed
//**For more information, refer to the DS18B20 data sheet and ZLG7289_430.C
/*********************************************************/
#include
#include "ZLG7289_430.C"

#define DS18B20_DIR P2DIR
#define DS18B20_IN P2IN
#define DS18B20_OUT P2OUT

#define DS18B20_DQ BIT3 //Define the interface of DS18B20

// DS18B20 ROM command macro definitions
#define ReadRom 0x33
#define MatchRom 0x55
#define SearchRom 0xf0
#define AlertSearch 0xec
#define CopyScratchpad 0x48
#define SkipRom 0xcc
#define ReadPower 0xb4

// DS18B20 function command macro definition
#define ConvertTemperature 0x44
#define ReadScratchpad 0xbe
#define WriteScratchpad 0x4e
#define RecallE 0xb8

#define SMCLK 4000 //(KHz) for

System Delay

// Decimal code of temperature (for table lookup)
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};

// variable definition
unsigned char GetScratchpad[9];
unsigned char ResultTemperatureH; // integer part of temperature
unsigned char ResultTemperatureLH; // fractional part of temperature (high bit)
unsigned char ResultTemperatureLL; // fractional part of temperature (low bit)

void DS18B20_WriteBit(unsigned char oww_dat);
void DS18B20_WriteByte(unsigned char oww_dat);
void DS18B20_R

eadTemp(void);
unsigned char DS18B20_Init(void);
unsigned char DS18B20_ReadBit(void);
unsigned char DS18B20_ReadByte(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

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);
}
}
****************************/

// Function definition

unsigned char DS18B20_Init(void){
unsigned char result;
DS18B20_DIR |= DS18B20_DQ; // ow output
DS18B20_OUT &= ~DS18B20_DQ; &

sp; // 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_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;

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;

unsigned char DS18B20_ReadByte(void){
unsigned char i;
unsigned char result="0";
for(i = 0; i < 8; i++){
if(DS18B20_ReadBit())
result |= 0x01 << i;
DelayX10us(12); // ??
}
return(res

ult); // 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; i < 8; i++){
temp = oww_dat >> i;
temp &= 0x01;
DS18B20_WriteBit(temp);
}
DelayX10us(7); // ??
}//Write a byte to the 1-wire bus;

void DS18B20_ReadTemp(void)
{ unsigned char tempH,tempL;
DS18B20_Init();
DS18B20_WriteByte(SkipRom);
_NOP();
//There is just one DS1820 on the bus;
DS18B20_WriteByte(ConvertTemperature);
DelayX10us(10);
//Start to convert temperature;
DS18B20_Init();
DS18B20_WriteByte(SkipRom);
_NOP();
DS18B20_WriteByte(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 sa

mples 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();
&nbs

p; //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];
//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();
}