CVAVR做的DS18b20温度只显示15度

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CVAVR做的DS18b20温度只显示15度 [复制链接]

 
    
 #include <mega16.h>
 #include <delay.h>
 #include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
uchar teml,temh,tem,tt,a,b;
flash uchar table[]={'0','1','2','3','4','5','6','7','8','9',};
// 1 Wire Bus functions
#asm
   .equ __w1_port=0x1B ;PORTA
   .equ __w1_bit=0
#endasm
#include <1wire.h>

// DS1820 Temperature Sensor functions
#include <ds18b20.h>

// Alphanumeric LCD Module functions
#asm
   .equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>

// Declare your global variables here

void main(void)
{
// 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: Timer1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 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: Timer2 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;

// 1 Wire Bus initialization
//w1_init();

// LCD module initialization
lcd_init(16);
while (1)
      {
      w1_write(0XCC); //发转换命令
      w1_write(0X44); //启动
      delay_ms(750);
        w1_init();
        w1_write(0XCC); //读
        w1_write(0XBE);

        teml=w1_read();
        temh=w1_read();
        delay_ms(750); //延时
        tem=temh;
        tem=tem*256;
        tem|=teml;
        tt=tem*0.0625;
        tem=tt*10+0.5;

        //tem=ds1820_read_spd(0xbe);
        //tem=0x16;
        a=tem/100;
        b=tem%100/10;
       
        //a=4;b=5;
       
         lcd_clear();
         lcd_gotoxy(6,0 );
         lcd_putsf("temp");
         lcd_gotoxy(6,1 );    
         lcd_putchar(table[a]);
         lcd_gotoxy(8,1 );
         lcd_putchar(table);
        
      };
}