ex6-4.c

本压缩文件主要介绍温度传感芯片的应用

/*
标题：范例6-4
版本：1.0
Target：89S51
程序描述：智能温度感测器，这个范例中使用到
（1）8051 的Port 1连接到LCD显示器，PORT 3的P3.3,P3.4和P3.5分别连接到LCD显示器的控制线，程序执行时可以让LCD显示器显示出时间和日期。
（2）温度感测组件AD590经由ADC0804将感测到的温度，转换成数字数据，然后经由PORT 0输入8051。
（3）8051的第10和第11只脚RXD和TXD分别连线到MAX232，然后连接到PC的COM埠。
（4）8051实验板每　小时就读入ADC0804转换的数字温度数据，然后记录在串行式EEPROM 93C66中。
（5）8051实验板可以经由RS232将记录在串行EEPROM 93C66中的数字温度数据传送PC端。*/
/* ***************************************************** */
#include <REGX51.H>
#include <lcd.h>
#define   XTAL             11059200
#define   baudrate         9600
#define   TIMES            25
#define   TIMER0_COUNT    0xD8F0  /* 10000h-((12,000,000/(12*100)) */
/* 数字时钟的工作模式 */
#define   SET              11
#define   TRUE             1
#define   FALSE            0
#define   putchar          write_LCD_data
#define   adc_in           P0
#define   adc_rd           P3_7
#define   adc_wr           P3_6
//
#define   mode_button         P2_2
#define   operation_button    P2_0
#define   up_button      1  
#define   down_button    1
#define   heat      P2_3
#define   cool      P2_1
//
typedef struct { 
                char    hour;
                char    minute;
                char    second;
} time;
typedef struct { 
                char    year;
                char    month;
                char    day;
} date;
time now={23,59,0},display;
date today={04,12,15},tmpday;
static unsigned timer0_tick=100,mode=0,operation;
char code  dayofmonth[]={31,28,31,30,31,30,31,31,30,31,30,31};
char code       weekday[7][4]={"MON","TUE","WED","THU","FRI","SAT","SUN"};
char code         int2char[10]="0123456789";
unsigned    char txOK,c,set_time;
int ii;
int      AT93C66_add,send_count;
int heatfast=1;
int   t,t1,tt,tt1;
int   min,max;
// 0 表示不记录在 AT93C66, 1 表示要记录在 AT93C66中     
unsigned          char temp_wr;
/*
                AT93C66的读写程序
*/
unsigned char   read_byte(int);
void            write_byte(int,unsigned char);
void delay(void)
{
        unsigned char i,j;
        for(i=0;i<125;i++)
                for(j=0;j<255;j++)
                ;
}
void display_tempreture(unsigned char number)
{
        unsigned char x,y;
        y=number-130;

          SBUF=number;         // 传送数据

		//***************************
       if(y>=min&&y<=max) 
	   {
	   heat=1;
	   cool=1;
	   }
 	   else if(y<min) 
	   {
	   if(heatfast==1){ heat=0;cool=1; P2=0X9F; }   //慢加热
	   else if(heatfast==2) {heat=1;cool=0; P2=0XDF; }   //快加热
        }
	   else if(y>max)  { cool=0;heat=0; } //制冷
	   //**********************************************
        x=y/10;
        gotoxy(1,9);
        write_LCD_data(int2char[x]);
        x=y%10;
        write_LCD_data(int2char[x]);
        if( temp_wr==1) {
              write_byte(AT93C66_add,y);
              if(AT93C66_add > 255) {
                      write_byte(0,1);
                      x=AT93C66_add -256;
                      write_byte(1,x);
              } else write_byte(1,(unsigned char)AT93C66_add);
              temp_wr=0;
              AT93C66_add++;
        }
}
void display_time(void)
{
        gotoxy(1,0);
        display_LCD_number(display.hour);
        display_LCD_string(":");
        display_LCD_number(display.minute);
        display_LCD_string(":");
        display_LCD_number(display.second);
}
void display_date()
{
    char i,days=4;
        gotoxy(2,2);
        display_LCD_number(tmpday.year);
        display_LCD_string("/");
        display_LCD_number(tmpday.month);
        display_LCD_string("/");
        display_LCD_number(tmpday.day);
        display_LCD_string(" ");
        if(tmpday.month > 1)
             for(i=0;i<=tmpday.month-2;i++)
                   days+=(dayofmonth[i]%7);
        if( tmpday.year !=0 ) days+=((tmpday.year-1)/4)
              +tmpday.year+1;
        if (tmpday.year%4==0 && tmpday.month >2) days++;
        days=(days+tmpday.day) % 7;
        display_LCD_string(&weekday[days][0]);
}
char monthday(char year,char month)
{
        if(month==2 && year%4==0)        //润年的2月有29天
        return(29);
        else
           return(dayofmonth[month-1]);  //非闰年时的该月份天数
}
static void timer0_isr(void) interrupt  TF0_VECTOR using 1
{
     TR0=0;
     TL0=(TIMER0_COUNT & 0x00FF);
     TH0=(TIMER0_COUNT >> 8);
     TR0=1;
     if(mode==1) return;
     if(--timer0_tick) return;
	 /****************************************
	   if (timer0_tick==times) {
    i++;
        if(i==4) i=0;
        timer0_tick=0;
        if (status==FORWARD) heat=forward[i];
  }	 
 ***************************/
     timer0_tick=100;
	 	 adc_wr=0;
         now.second++; //秒加1
	      if(timer0_tick%2==0)
		  {
		  adc_wr=1;  
                temp_wr=1;   }                     
	             if (now.second==60) {                //如果秒等于60
                       now.second=0; 
                  //秒恢复为0
                   now.minute++;  
                
                 //分加1
          if (now.minute==60) {           //如果分等于60
               now.minute=0;             //分恢复为0
                    now.hour++;               //时加1
               if (now.hour==24) {       //如果时等于24
                    now.hour=0;          //时恢复为0
                    today.day++;         //日加1
                    if (today.day>monthday(today.year,today
                                           .month)) {
                    today.day=1; //如果日超过当月最大日数,就变成1
                    today.month++;       //月加1
                       if(today.month==13) {   //如果月等于13
                           today.month=1;      //月恢复为1
                           today.year++;       //年加1
                               }
                         }
                         tmpday=today;
                         display_date();
                    }
             }
    }
    display=now;
    display_time();
}
static void timer0_initialize(void)
{
        EA=0;   
        TR0=0;
        TMOD &= 0XF0;
        TMOD |=0x01;
        TL0=(TIMER0_COUNT & 0x00FF);
        TH0=(TIMER0_COUNT >> 8);
        PT0=0;
        ET0=1;
        TR0=1;
        EA=1;
}
static void int0_isr(void) interrupt 0 using 0
{
        unsigned char voltage;
        adc_in=0xFF;
        adc_rd=0;
        voltage=adc_in; 
        adc_rd=1;
        display_tempreture(voltage);    
}
static void com_isr(void) interrupt SIO_VECTOR using 1
{
        if(TI) {
             TI=0;
            /* if (send_count < AT93C66_add) {
                  SBUF=read_byte(send_count)+32; // 传送数据
                  send_count++;
             }	*/
        }
}
void com_initialize(void) {
        PCON |= 0x80;
        TMOD=0x20;
        TH1=(unsigned char) (256-(XTAL/(16L*12L*baudrate)));
        TR1=(unsigned char) (256-(XTAL/(16L*12L*baudrate)));
        SCON=0x50;
        ES=1;
        TR1=1;
}
char gotkey() {
        if (mode_button==0) {
                delay();
                if (mode_button==0) return(0);
        }
        if (operation_button==0) {
                delay();
                if (operation_button==0) return(1);
        }
        if (up_button==0) {
                delay();
                if (up_button==0) return(2);