main._c

结合温度传感器的实现测温度的C程序 这个小项目用到了比较多的AVR单片机的资源 是个不错的学习例程

//ICC-AVR application builder : 2005-11-2 16:28:30
// Target : 8515
// Crystal: 4.0000Mhz
#include <io8515v.h>
#include <macros.h>
#include <162-1302.h>
#include <function.h>
uchar temh_d;
uchar teml_d;
uchar temm_d;
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0xFF;
 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0xFF;
 DDRC  = 0xFF;
 PORTD = 0x00;
 DDRD  = 0x00; 
}	   	 	   		//call this routine to initialize all peripherals
void init_devices(void)
{
 	 				//stop errant interrupts until set up
 CLI(); 			//disable all interrupts
 port_init();
 MCUCR = 0x00;
 GIMSK = 0x00;
 TIMSK = 0x00;
 SEI();  	   		//re-enable interrupts
 			   		//all peripherals are now initialized
}
/******************************************************
                         主程序
******************************************************/		               
void main(void)
{
uchar s,i,th,tl;
 uchar temh,teml,a,count,temm; 
init_devices();
init_1302();
init_1302();
init_lcd() ;
init_lcd() ;
init_time();
   while(1)
    {
	 LCD_set_xy(0,0);
	 for(i=0;i<9;i+=2)
	 {
   	  s=read_data(0x81+i);
	  tl=s&0x0f;
   	  th=(s>>4);
   	  LCD_write_char(th+48);
      LCD_write_char(tl+48);
	  LCD_write_char(':');
	 }
	  s=read_data(0x8b);
	  tl=s&0x0f;
      LCD_write_char(tl+48);
	  
	 a=init_1820();               //复位18b20   
if(a==0x01)
{
LCD_write_string(0,1,"wrong"); //初始化失败
}
else
{
LCD_write_string(0,1,"temper is");//初始化成功
}                  
     write_1820(0xCC);              // SKIP THE ROM
      write_1820(0x44);              //启动温度转换
	  for(i=0;i<200;i++)           //每次转换需要延时200ms以上 
        delay(200);   
      a=init_1820();               //复位18b20 
      write_1820(0xCC);               //SKIP THE ROM
      write_1820(0xBE);               //读寄存器命令
      teml=read_1820();              //读低字节数据 
      temh=read_1820();              //读高字节数据 
	  temm=teml;
	  temm&=0x0F;
	  teml>>=4;
	  temh<<=4;
	  count=teml|temh;
	  temh_d=count/10;
	  temm_d=(temm*6)/10;
	  teml_d=count%10;
      delay(200);  
	  LCD_set_xy(10,1);
	  LCD_write_char(temh_d+48);       
	  LCD_set_xy(11,1);
	  LCD_write_char(teml_d+48);  
	  LCD_set_xy(12,1);
	  LCD_write_char('.');     
	  LCD_set_xy(13,1);
	  LCD_write_char(temm_d+48); 
	  LCD_write_string(14,1,"`c");     
     }
}