基于meg128温控程序测不出？求解

只看该作者 · 2013-7-10 14:53

#include <avr/io.h>
#include<avr/interrupt.h>
#include <util/delay.h>
#include "LCD.h"
#define uchar unsigned char
#define uint unsigned int

#define DQ_IN DDRD&= ~(1 << PD3)
#define DQ_OUT DDRD|=(1 << PD3)
#define DQ_SET PORTD|=(1 << PD3)
#define DQ_CLR PORTD&=~(1 << PD3)
#define DQ_R PIND&(1 << PD3)

uchar table[3]={0,0,0};

uchar ds18b20_reset(void)
{
uchar i;
DQ_OUT;
DQ_CLR;
  _delay_us(500);
DQ_SET;  //release bus
_delay_us(100);
DQ_IN;
i = DQ_R;
  _delay_us(500);
DQ_SET;
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&0x01)
{
  DQ_SET;
}
  else
       DQ_CLR;
  _delay_us(100);

value = value >> 1;
  DQ_SET;//总线释放
  _delay_us(2);
}
}

/******************************/
uchar ds18b20_read_byte(void)
{
uchar i;
uchar value;
for(i=0; i<8; i++)
{
  value = value>>1;
  DQ_OUT;
  DQ_CLR;
  _delay_us(10);
  DQ_SET;
  DQ_IN;//采样开始
  if(DQ_R)
  {
value |= 0x80;
  }
  _delay_us(50);
}
return value;
}
/**************************************/
void data_pro(uint temp)
{
uint a;
table[2] = temp/100;
a = temp%100;
table[1] = a/10;
table[0] = a%10;
}

/****************************************/
void main(void)
{
      uchar k;
uchar i,j;
uint temp;

system_init();                         //系统初始化，设
_delay_ms(100);                         //延时100ms
LCD_init();                            //液晶参数初始化
LCD_clear();

while(1)
{
  ds18b20_reset();
  ds18b20_write_byte(0xcc);
  ds18b20_write_byte(0x44);
  _delay_us(2000);

  ds18b20_reset();
  ds18b20_write_byte(0xcc);
  ds18b20_write_byte(0xbe);
  i = ds18b20_read_byte();//lsb
  j = ds18b20_read_byte();//msb
  temp = j*256 + i;  //26.8
  temp = temp*0.625;//268
  data_pro(temp);
  for(k=0; k<20; k++)
  {
    LCD_write_com(0xc6);
LCD_write_data(table[2]+0x30);
    LCD_write_data(table[1]+0x30);
LCD_write_data(table[0]+0x30);

}
}
}