温度传感器ds18b20-AVR程序代码

#include

#include

//AlphanumericLCDModulefunctions

#asm

.equ__lcd_port=0x18;PORTB

#endasm

#include

#defineucharunsignedchar

#defineuintunsignedint

#defineBIT(x)1<<(x)

#defineDQ_INDDRC&=~BIT(2)

#defineDQ_OUTDDRC|=BIT(2)

#defineDQ_SETPORTC|=BIT(2)

#defineDQ_CLRPORTC&=~BIT(2)

#defineDQ_RPINC&BIT(2)

uintwan,qian,bai,shi;

uchards18b20_reset(void)

{

uchari;

DQ_OUT;

DQ_CLR;

delay_us(500);

DQ_SET;

delay_us(100);

DQ_IN;

i=DQ_R;

delay_us(500);

returni;

}

voidds18b20_write_byte(ucharvalue)

{

uchari;

for(i=0;i<8;i++){

DQ_OUT;

DQ_CLR;

delay_us(10);

if(value&BIT(0))

{

DQ_SET;

}

delay_us(100);

DQ_SET;

value=value>>1;

}

}

uchards18b20_read_byte(void)

{

uchari,value;

for(i=0;i<8;i++)

{

value=value>>1;

DQ_OUT;

DQ_CLR;

delay_us(10);

DQ_SET;

DQ_IN;

if(DQ_R)

{

value|=0x80;

}

delay_us(50);

}

returnvalue;

}

//Declareyourglobalvariableshere

voidmain(void)

{uchari,j;

doubletemp;

//Declareyourlocalvariableshere

//Input/OutputPortsinitialization

//PortAinitialization

//Func7=InFunc6=InFunc5=InFunc4=InFunc3=InFunc2=InFunc1=InFunc0=In

//State7=TState6=TState5=TState4=TState3=TState2=TState1=TState0=T

PORTA=0x00;

DDRA=0x00;

//PortBinitialization

//Func7=InFunc6=InFunc5=InFunc4=InFunc3=InFunc2=InFunc1=InFunc0=In

//State7=TState6=TState5=TState4=TState3=TState2=TState1=TState0=T

PORTB=0x00;

DDRB=0x00;

//PortCinitialization

//Func7=InFunc6=InFunc5=InFunc4=InFunc3=InFunc2=InFunc1=InFunc0=In

//State7=TState6=TState5=TState4=TState3=TState2=TState1=TState0=T

PORTC=0x00;

DDRC=0x00;

//PortDinitialization

//Func7=InFunc6=InFunc5=InFunc4=InFunc3=InFunc2=InFunc1=InFunc0=In

//State7=TState6=TState5=TState4=TState3=TState2=TState1=TState0=T

PORTD=0x00;

DDRD=0x00;

//Timer/Counter0initialization

//Clocksource:SystemClock

//Clockvalue:Timer0Stopped

//Mode:Normaltop=FFh

//OC0output:Disconnected

TCCR0=0x00;

TCNT0=0x00;

OCR0=0x00;

//Timer/Counter1initialization

//Clocksource:SystemClock

//Clockvalue:Timer1Stopped

//Mode:Normaltop=FFFFh

//OC1Aoutput:Discon.

//OC1Boutput:Discon.

//NoiseCanceler:Off

//InputCaptureonFallingEdge

//Timer1OverflowInterrupt:Off

//InputCaptureInterrupt:Off

//CompareAMatchInterrupt:Off

//CompareBMatchInterrupt:Off

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

//Timer/Counter2initialization

//Clocksource:SystemClock

//Clockvalue:Timer2Stopped

//Mode:Normaltop=FFh

//OC2output:Disconnected

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

//ExternalInterrupt(s)initialization

//INT0:Off

//INT1:Off

//INT2:Off

MCUCR=0x00;

MCUCSR=0x00;

//Timer(s)/Counter(s)Interrupt(s)initialization

TIMSK=0x00;

//AnalogComparatorinitialization

//AnalogComparator:Off

//AnalogComparatorInputCapturebyTimer/Counter1:Off

ACSR=0x80;

SFIOR=0x00;

//LCDmoduleinitialization

lcd_init(16);

while(1)

{ds18b20_reset();

ds18b20_write_byte(0xcc);

ds18b20_write_byte(0x44);

delay_us(20);

ds18b20_reset();

ds18b20_write_byte(0xcc);

ds18b20_write_byte(0xbe);

i=ds18b20_read_byte();

j=ds18b20_read_byte();

temp=(j*256.0+i)*6.25;

wan=(int)temp/1000;

qian=(int)temp00/100;

bai=(int)temp0/10;

shi=(int)temp;

lcd_gotoxy(0,0);

lcd_putchar(wan+48);

lcd_putchar(qian+48);

lcd_putchar('.');

lcd_putchar(bai+48);

lcd_putchar(shi+48);

delay_ms(100);

//Placeyourcodehere

};

}