temper.c

带有存储器功能的数字温度计－DS1624技术应用。proteus的实践例子 既有电路又有keil里的程序 asm or c

   #include <AT89X52.H> 
#include <INTRINS.H> 
  
unsigned char code displaybit[]={0xfe,0xfd,0xfb,0xf7, 
                                 0xef,0xdf,0xbf,0x7f}; 
unsigned char code displaycode[]={0x3f,0x06,0x5b,0x4f, 
                                    0x66,0x6d,0x7d,0x07, 
                                    0x7f,0x6f,0x77,0x7c, 
                                    0x39,0x5e,0x79,0x71,0x00}; 
  
unsigned char code dotcode[32]={0,3,6,9,12,16,19,22, 
                                25,28,31,34,38,41,44,48, 
                                50,53,56,59,63,66,69,72, 
                                75,78,81,84,88,91,94,97}; 
  
  
sbit SDA=P1^6; 
sbit SCL=P1^7; 
  
unsigned char displaybuffer[8]={0,1,2,3,4,5,6,7}; 
unsigned char eepromdata[8]; 
unsigned char temperdata[2]; 
  
unsigned char timecount; 
unsigned char displaycount; 
  
bit secondflag=0; 
unsigned char secondcount=0; 
unsigned char retn; 
unsigned int result; 
unsigned char x; 
unsigned int k; 
unsigned int ks; 
  
  
  
void delay(void); 
void delay10ms(void); 
void i_start(void); 
void i_stop(void); 
void i_init(void); 
void i_ack(void); 
bit i_clock(void); 
bit i_send(unsigned char i_data); 
unsigned char i_receive(void); 
  
bit start_temperature_T(void); 
bit read_temperature_T(unsigned char *p); 
  
void delay(void) 
{ 
  _nop_(); 
  _nop_(); 
  _nop_(); 
  _nop_(); 
  _nop_(); 
  _nop_(); 
} 
  
void delay10ms(void) 
{ 
  unsigned int i; 
  for(i=0;i<1000;i++) 
    { 
      delay(); 
    } 
  
} 
  
void i_start(void) 
{ 
  SCL=1; 
  delay(); 
  SDA=0; 
  delay(); 
  SCL=0; 
  delay(); 
} 
  
void i_stop(void) 
{ 
  SDA=0; 
  delay(); 
  SCL=1; 
  delay(); 
  SDA=1; 
  delay(); 
  SCL=0; 
  delay(); 
} 
  
void i_init(void) 
{ 
  SCL=0; 
  i_stop(); 
} 
  
void i_ack(void) 
{ 
  SDA=0; 
  i_clock(); 
  SDA=1; 
} 
  
bit i_clock(void) 
{ 
  bit sample; 
  
  SCL=1; 
  delay(); 
  sample=SDA; 
  _nop_(); 
  _nop_(); 
  SCL=0; 
  delay(); 
  return(sample); 
} 
  
  
bit i_send(unsigned char i_data) 
{ 
  unsigned char i; 
  
  for(i=0;i<8;i++) 
    { 
      SDA=(bit)(i_data & 0x80); 
      i_data=i_data<<1; 
      i_clock(); 
    } 
  SDA=1; 
  return(~i_clock()); 
} 
  
unsigned char i_receive(void) 
{ 
  unsigned char i_data=0; 
  unsigned char i; 
  
  for(i=0;i<8;i++) 
    { 
      i_data*=2; 
      if(i_clock()) i_data++; 
    } 
  return(i_data); 
} 
  
bit start_temperature_T(void) 
{ 
  i_start(); 
  if(i_send(0x90)) 
    { 
      if(i_send(0xee)) 
        { 
          i_stop(); 
          delay(); 
          return(1); 
        } 
        else 
          { 
            i_stop(); 
            delay(); 
            return(0); 
          } 
    } 
    else 
      { 
        i_stop(); 
        delay(); 
        return(0); 
      } 
} 
  
bit read_temperature_T(unsigned char *p) 
{ 
  i_start(); 
  if(i_send(0x90)) 
    { 
      if(i_send(0xaa)) 
        { 
          i_start(); 
          if(i_send(0x91)) 
            { 
              *(p+1)=i_receive(); 
              i_ack(); 
              *p=i_receive(); 
              i_stop(); 
              delay(); 
              return(1); 
            } 
            else 
              { 
                i_stop(); 
                delay(); 
                return(0); 
              } 
        } 
        else 
          { 
            i_stop(); 
            delay(); 
            return(0); 
          } 
    } 
    else 
      { 
        i_stop(); 
        delay(); 
        return(0); 
      } 
} 
  
  
void main(void) 
{ 
  P1=0xff; 
  timecount=0; 
  displaycount=0;  
  
  TMOD=0x21; 
  TH1=0x06; 
  TL1=0x06; 
  TR1=1; 
  ET1=1; 
  ET0=1; 
  EA=1; 
  
  
  if(start_temperature_T())			//向DS1624发送启动A/D温度转换命令，成功则启动T0定时1s。 
    { 
      secondflag=0; 
      secondcount=0; 
      TH0=55536/256; 
      TL0=55536%256; 
      TR0=1;      
    } 
  
  while(1) 
    { 
      if(secondflag==1) 
        { 
          secondflag=0; 
          TR0=0; 
          if(read_temperature_T(temperdata))	//T0定时1s时间到，读取DS1624的温度值 
            { 
              for(x=0;x<8;x++) 
                { 
                  displaybuffer[x]=16; 
                } 
              x=2; 
              result=temperdata[1];			//将读取的温度值进行数据处理，并送到显示缓冲区 
              while(result/10) 
                { 
                  displaybuffer[x]=result%10; 
                  result=result/10; 
                  x++; 
                } 
              displaybuffer[x]=result; 
              result=temperdata[0]; 
              result=result>>3; 
              displaybuffer[0]=(dotcode[result])%10; 
              displaybuffer[1]=(dotcode[result])/10;              
              if(start_temperature_T())	//温度值数据处理完毕，重新启动DS1624开始温度转换 
                { 
                  secondflag=0; 
                  secondcount=0; 
                  TH0=55536/256; 
                  TL0=55536%256; 
                  TR0=1;                        
                } 
            } 
        } 
    } 
} 
  
  
void t0(void) interrupt 1 using 0			//T0用于定时1s时间到 
{ 
  secondcount++; 
  if(secondcount==100) 
    { 
      secondcount=0; 
      secondflag=1; 
    } 
  TH0=55536/256; 
  TL0=55536%256; 
} 
  
  
void t1(void) interrupt 3 using 0			//T1定时1ms用数码管的动态刷新 
{ 
  timecount++; 
  if(timecount==4)					//T1定时1ms到 
    { 
      timecount=0; 
	   P2=0xff;
      if (displaycount==5) 
        { 
          P0=(displaycode[displaybuffer[7-displaycount]] | 0x80);	//在该位同时还要显示小数点 
        } 
        else 
          { 
            P0=displaycode[displaybuffer[7-displaycount]]; 
          } 
      P2=displaybit[displaycount]; 
      displaycount++; 
      if(displaycount==8) 
        { 
          displaycount=0; 
        } 
    } 
}