ex6-4.c

在Keil环境下

/*
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_7
#define   operation_button P2_6
#define   up_button        P2_5
#define   down_button      P2_4
//
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[]="0123456789";
unsigned          char txOK,c,set_time;
int               AT93C66_add,send_count;
// 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<<1) - 232;
        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;
     timer0_tick=100;
     now.second++;                        //秒加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
               adc_wr=0;
               now.hour++;               //时加1
               adc_wr=1;
               temp_wr=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;
        voltage=voltage <<1;
        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);
        }
        if (down_button==0) {
                delay();
                if (down_button==0) return(3);
        }
        return(15);
}
//
void main (void)  {
        char keys;

        txOK=1;
        mode=0;
        operation=0;
        init_LCD();
        clear_LCD();
        gotoxy(2,0);
        display_LCD_string("20");
        display=now;
        display_time();
        tmpday=today;
        display_date();
        EA=1;
        com_initialize();
        timer0_initialize();
        IT0=1;
        EX0=1;
        adc_wr=0;                       
        temp_wr=0;
        adc_wr=1;                       
        do {
             keys=gotkey();
             switch(keys) {
                case 0 :
                    mode++;
                    if(mode==4) mode=0;
                    gotoxy(1,12);
                    write_LCD_data(int2char[mode]);
                    if(mode==1) {
                            display=now;
                            tmpday=today;
                    }
                    if(mode==2) {
                            now=display;
                            today=tmpday;
                    }
                    break;
                case 1 :
                    if(mode==0) break;
                    if(mode==1) {
                         operation++;
                            if(operation==5) operation=0;
                        }
                        if(mode==2) {
                          send_count=1;
                          SBUF=read_byte(0)+32;   // 传送数据
                        }
                        if(mode==3) {
                            write_byte(0,0);
                            write_byte(0,0);
                            write_byte(1,6);
                            write_byte(2,today.year);
                                write_byte(3,today.month);
                                write_byte(4,today.day);
                                write_byte(5,now.hour);
                                AT93C66_add=6;
                                adc_wr=0;
                                temp_wr=1;
                                adc_wr=1;
                        }
                        gotoxy(1,14);
                        write_LCD_data(int2char[operation]);
                        break;
                 case 2 :
                         if(mode!=1) break;
                         switch(operation) {
                            case 0 : display.hour++;
                                     if(display.hour>=24)
                                        display.hour=0;
                                     gotoxy(1,0);
                                     display_LCD_number
                                       (display.hour);
                                        break;
                            case 1 : display.minute++;
                                     if(display.minute>=60) 
                                        display.minute=0;
                                     gotoxy(1,3);
                                     display_LCD_number
                                       (display.minute);
                                        break;
                            case 2 : tmpday.year++;
                                     if(tmpday.year>=100) 
                                        tmpday.year=0;
                                     display_date();
                                     break;
                            case 3 : tmpday.month++;
                                     if(tmpday.month>12) tmpday.
                                     month=1;
                                     display_date();
                                     break;
                            case 4 : tmpday.day++;
                                     if(tmpday.day>monthday
                                     (tmpday.year,
                                      tmpday.month)) 
                                      tmpday.day=1;
                                     display_date();
                                     break;
                                     }
                                     break;
                   case 3 :
                        if(mode!=1) break;
                        switch(operation) {
                      case 0 : display.hour--;
                           if(display.hour<0) display.hour=23;
                           gotoxy(1,0);
                           display_LCD_number(display.hour);
                           break;
                      case 1 : display.minute--;
                               if(display.minute<0) 
                                  display.minute=59;
                                  gotoxy(1,3);
                                  display_LCD_number
                                  (display.minute);
                               break;
                      case 2 : tmpday.year--;
                           if(tmpday.year<0) tmpday.year=99;
                           display_date();
                           break;
                      case 3 : tmpday.month--;
                           if(tmpday.month<1) tmpday.month=12;
                           display_date();
                           break;
                      case 4 : tmpday.day--;
                           if(tmpday.day<1)
                           tmpday.day=monthday
                           (tmpday.year,tmpday.month);
                           display_date();
                           break;
                 }
         }
   } while(1);
}