温度传感器ds18b20-AVR程序代码

ID:51024 · 发表于 2014-7-12 01:57

以前学AVR时候写的一些程序，分享一下

#include

#include

// Alphanumeric LCD Module functions

#asm

.equ __lcd_port=0x18 ;PORTB

#endasm

#include

#define  uchar unsigned char

#define  uint unsigned int

#define  BIT(x) 1<<(x)

#define DQ_IN DDRC&=~BIT(2)

#define DQ_OUT DDRC|=BIT(2)

#define DQ_SET PORTC|=BIT(2)

#define DQ_CLR PORTC&=~BIT(2)

#define DQ_R PINC&BIT(2)

uint wan,qian,bai,shi;

uchar ds18b20_reset(void)

{

uchar i;

DQ_OUT;

DQ_CLR;

delay_us(500);

DQ_SET;

delay_us(100);

DQ_IN;

i=DQ_R;

delay_us(500);

return i;

}

void ds18b20_write_byte(uchar value)

{

uchar i;

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;

}

}

uchar ds18b20_read_byte(void)

{

uchar i,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);

}

return value;

}

// Declare your global variables here

void main(void)

{  uchar i,j;

double  temp;

// Declare your local variables here

// Input/Output Ports initialization

// Port A initialization

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In

// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T

PORTA=0x00;

DDRA=0x00;

// Port B initialization

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In

// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T

PORTB=0x00;

DDRB=0x00;

// Port C initialization

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In

// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T

PORTC=0x00;

DDRC=0x00;

// Port D initialization

// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In

// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T

PORTD=0x00;

DDRD=0x00;

// Timer/Counter 0 initialization

// Clock source: System Clock

// Clock value: Timer 0 Stopped

// Mode: Normal top=FFh

// OC0 output: Disconnected

TCCR0=0x00;

TCNT0=0x00;

OCR0=0x00;

// Timer/Counter 1 initialization

// Clock source: System Clock

// Clock value: Timer 1 Stopped

// Mode: Normal top=FFFFh

// OC1A output: Discon.

// OC1B output: Discon.

// Noise Canceler: Off

// Input Capture on Falling Edge

// Timer 1 Overflow Interrupt: Off

// Input Capture Interrupt: Off

// Compare A Match Interrupt: Off

// Compare B Match Interrupt: Off

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

// Timer/Counter 2 initialization

// Clock source: System Clock

// Clock value: Timer 2 Stopped

// Mode: Normal top=FFh

// OC2 output: Disconnected

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

// External Interrupt(s) initialization

// INT0: Off

// INT1: Off

// INT2: Off

MCUCR=0x00;

MCUCSR=0x00;

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

TIMSK=0x00;

// Analog Comparator initialization

// Analog Comparator: Off

// Analog Comparator Input Capture by Timer/Counter 1: Off

ACSR=0x80;

SFIOR=0x00;

// LCD module initialization

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);

   // Place your code here

   };

}

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