ds18b20.i

C语言编写的DS18B20温度传感器的程序

// CodeVisionAVR C Compiler
// (C) 1998-2001 Pavel Haiduc, HP InfoTech S.R.L.

// I/O registers definitions for the ATmega16


#pragma used+
sfrb TWBR=0;
sfrb TWSR=1;
sfrb TWAR=2;
sfrb TWDR=3;
sfrb ADCL=4;
sfrb ADCH=5;
sfrw ADCW=4;      // 16 bit access
sfrb ADCSRA=6;
sfrb ADMUX=7;
sfrb ACSR=8;
sfrb UBRRL=9;
sfrb UCSRB=0xa;
sfrb UCSRA=0xb;
sfrb UDR=0xc;
sfrb SPCR=0xd;
sfrb SPSR=0xe;
sfrb SPDR=0xf;
sfrb PIND=0x10;
sfrb DDRD=0x11;
sfrb PORTD=0x12;
sfrb PINC=0x13;
sfrb DDRC=0x14;
sfrb PORTC=0x15;
sfrb PINB=0x16;
sfrb DDRB=0x17;
sfrb PORTB=0x18;
sfrb PINA=0x19;
sfrb DDRA=0x1a;
sfrb PORTA=0x1b;
sfrb EECR=0x1c;
sfrb EEDR=0x1d;
sfrb EEARL=0x1e;
sfrb EEARH=0x1f;
sfrw EEAR=0x1e;   // 16 bit access
sfrb UBRRH=0x20;
sfrb UCSRC=0X20;
sfrb WDTCR=0x21;
sfrb ASSR=0x22;
sfrb OCR2=0x23;
sfrb TCNT2=0x24;
sfrb TCCR2=0x25;
sfrb ICR1L=0x26;
sfrb ICR1H=0x27;
sfrb OCR1BL=0x28;
sfrb OCR1BH=0x29;
sfrw OCR1B=0x28;  // 16 bit access
sfrb OCR1AL=0x2a;
sfrb OCR1AH=0x2b;
sfrw OCR1A=0x2a;  // 16 bit access
sfrb TCNT1L=0x2c;
sfrb TCNT1H=0x2d;
sfrw TCNT1=0x2c;  // 16 bit access
sfrb TCCR1B=0x2e;
sfrb TCCR1A=0x2f;
sfrb SFIOR=0x30;
sfrb OSCCAL=0x31;
sfrb OCDR=0x31;
sfrb TCNT0=0x32;
sfrb TCCR0=0x33;
sfrb MCUCSR=0x34;
sfrb MCUCR=0x35;
sfrb TWCR=0x36;
sfrb SPMCR=0x37;
sfrb TIFR=0x38;
sfrb TIMSK=0x39;
sfrb GIFR=0x3a;
sfrb GICR=0x3b;
sfrb OCR0=0X3c;
sfrb SPL=0x3d;
sfrb SPH=0x3e;
sfrb SREG=0x3f;
#pragma used-

// Interrupt vectors definitions


// Needed by the power management functions (sleep.h)
#asm
	#ifndef __SLEEP_DEFINED__
	#define __SLEEP_DEFINED__
	.EQU __se_bit=0x40
	.EQU __sm_mask=0xB0
	.EQU __sm_powerdown=0x20
	.EQU __sm_powersave=0x30
	.EQU __sm_standby=0xA0
	.EQU __sm_ext_standby=0xB0
	.EQU __sm_adc_noise_red=0x10
	.SET power_ctrl_reg=mcucr
	#endif
#endasm


// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.


#pragma used+

void delay_us(unsigned int n);
void delay_ms(unsigned int n);

#pragma used-

/* CodeVisionAVR C Compiler
   Prototypes for standard library functions

   (C) 1998-2003 Pavel Haiduc, HP InfoTech S.R.L.
*/




#pragma used+

int atoi(char *str);
long int atol(char *str);
float atof(char *str);
void itoa(int n,char *str);
void ltoa(long int n,char *str);
void ftoa(float n,unsigned char decimals,char *str);
void ftoe(float n,unsigned char decimals,char *str);
void srand(int seed);
int rand(void);
void *malloc(unsigned int size);
void *calloc(unsigned int num, unsigned int size);
void *realloc(void *ptr, unsigned int size); 
void free(void *ptr);

#pragma used-
#pragma library stdlib.lib


// CodeVisionAVR C Compiler
// (C) 1998-2007 Pavel Haiduc, HP InfoTech S.R.L.

// Prototypes for string functions



#pragma used+

char *strcat(char *str1,char *str2);
char *strcatf(char *str1,char flash *str2);
char *strchr(char *str,char c);
signed char strcmp(char *str1,char *str2);
signed char strcmpf(char *str1,char flash *str2);
char *strcpy(char *dest,char *src);
char *strcpyf(char *dest,char flash *src);
unsigned int strlenf(char flash *str);
char *strncat(char *str1,char *str2,unsigned char n);
char *strncatf(char *str1,char flash *str2,unsigned char n);
signed char strncmp(char *str1,char *str2,unsigned char n);
signed char strncmpf(char *str1,char flash *str2,unsigned char n);
char *strncpy(char *dest,char *src,unsigned char n);
char *strncpyf(char *dest,char flash *src,unsigned char n);
char *strpbrk(char *str,char *set);
char *strpbrkf(char *str,char flash *set);
char *strrchr(char *str,char c);
char *strrpbrk(char *str,char *set);
char *strrpbrkf(char *str,char flash *set);
char *strstr(char *str1,char *str2);
char *strstrf(char *str1,char flash *str2);
char *strtok(char *str1,char flash *str2);
 
unsigned int strlen(char *str);
void *memccpy(void *dest,void *src,char c,unsigned n);
void *memchr(void *buf,unsigned char c,unsigned n);
signed char memcmp(void *buf1,void *buf2,unsigned n);
signed char memcmpf(void *buf1,void flash *buf2,unsigned n);
void *memcpy(void *dest,void *src,unsigned n);
void *memcpyf(void *dest,void flash *src,unsigned n);
void *memmove(void *dest,void *src,unsigned n);
void *memset(void *buf,unsigned char c,unsigned n);
unsigned int strcspn(char *str,char *set);
unsigned int strcspnf(char *str,char flash *set);
int strpos(char *str,char c);
int strrpos(char *str,char c);
unsigned int strspn(char *str,char *set);
unsigned int strspnf(char *str,char flash *set);

#pragma used-
#pragma library string.lib


#asm
        .equ __lcd_port=0x1b  //端口A
    #endasm
/* LCD driver routines

  CodeVisionAVR C Compiler
  (C) 1998-2003 Pavel Haiduc, HP InfoTech S.R.L.

  BEFORE #include -ING THIS FILE YOU
  MUST DECLARE THE I/O ADDRESS OF THE
  DATA REGISTER OF THE PORT AT WHICH
  THE LCD IS CONNECTED!

  EXAMPLE FOR PORTB:

    #asm
        .equ __lcd_port=0x18
    #endasm
    #include <lcd.h>

*/


#pragma used+

void _lcd_ready(void);
void _lcd_write_data(unsigned char data);
// write a byte to the LCD character generator or display RAM
void lcd_write_byte(unsigned char addr, unsigned char data);
// read a byte from the LCD character generator or display RAM
unsigned char lcd_read_byte(unsigned char addr);
// set the LCD display position  x=0..39 y=0..3
void lcd_gotoxy(unsigned char x, unsigned char y);
// clear the LCD
void lcd_clear(void);
void lcd_putchar(char c);
// write the string str located in SRAM to the LCD
void lcd_puts(char *str);
// write the string str located in FLASH to the LCD
void lcd_putsf(char flash *str);
// initialize the LCD controller
unsigned char lcd_init(unsigned char lcd_columns);

#pragma used-
#pragma library lcd.lib


//char flash string[]="date:";
//char flash s[]="time:";
char flash s1[]="wendu:" ;
//char flash s2[]="\xdfC" ; 
char tempstr[5];  
//char s3[]="set tempature"; 
//char s4[]="temparature is" ;
//char s5[]="too high";
float tempa ;
/*void lcd_xianshiflash(uchar x,uchar y,char flash *string)
{
     lcd_gotoxy(x,y);
     lcd_putsf(string);
} */
void b20_init(void)     //初始化
{   
      
   DDRC|=0x01    ;
   PORTC|=0x01    ; 
   delay_us(4);
   PORTC&=~0x01 ;
   delay_us(500);
   PORTC|=0x01    ;
   DDRC&=~0x01;  delay_us(5); 
   while(PINC&0x01);
   while(!PINC&0x01);  
   DDRC|=0x01    ;
   PORTC|=0x01    ;
   delay_us(20);
}
void b20_write_byte(unsigned char data) //写时间隙
{   
    unsigned char i;
    for(i=0;i<8;i++)
    { 
         if(data&0x01)
        { 
           PORTC&=~0x01 ;
           delay_us(7);
           PORTC|=0x01    ;
           delay_us(55);
        }
       else
       {
            PORTC&=~0x01 ;
            delay_us(60);
            PORTC|=0x01    ;
            delay_us(8);
        }
        data=data>>1;
    }
}
unsigned char b20_read_byte(void)  //读时间隙
{
    unsigned char data,i;
    data=0x00;
    for(i=0;i<8;i++)
    {  
        PORTC&=~0x01 ;
        delay_us(5);
        PORTC|=0x01    ;
        delay_us(2);
        if(PINC&0x01)
         { 
            data|=(0x01<<i);
         }
        delay_us(45); 
    }
    return (data);
}  
void b20_write_command(unsigned char command)
{   
    b20_init(); 
    delay_ms(1);   
    b20_write_byte(0xCC);
    b20_write_byte(command);
}
void b20_read_temparater(void)
{     
     
    
     int temp;  
     unsigned char templ,temph; 
     
     b20_write_command(0x44);//开始温度转换
     b20_write_command(0xBE);//读取暂存器和CRC字节 
     templ=b20_read_byte();
     temph=b20_read_byte();//高字节        
     lcd_gotoxy(1,1);   
     lcd_puts(0);
     if(temph&0x80)
     {
         temp=temph;
         temp=(temp<<8)|templ;
         temp=(-1)*temp;
         lcd_gotoxy(9,1);
         lcd_putchar('-');
     }  
     else  {
          temp=temph;
          temp=(temp<<8)|templ;
         }  
     tempa=(temp>>4)+(temp&0x0F)/16.0;        
     
     
}  
void main()
{
    
    if(lcd_init(16))                                    
    {
        lcd_clear(); 
        while(1)
        {
         b20_read_temparater(); 
         ftoa(tempa,1,tempstr);//将浮点通过ftoa函数转为一个字符串，然后把字符串中的每一个字符依次发送出去。  
         lcd_gotoxy(0,0);
         lcd_putsf(s1);
         lcd_gotoxy(10,0) ;
           lcd_puts(tempstr) ; //该函数将在从当前的显示位置开始，显示定义在SRAM中的字符串      
           delay_ms(1000);
         }
     }      
}