ex6-3.c

< 嵌入式C语言程序设计>>一书的源代码

/*
标题：范例 6-3
版本：1.0
Target：89S51
程序描述：网络远端温度感测器，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，转换成数位数据，然后经由PORT 0输入8051。
（3）igangcai 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)  当PC端经由RS232传送S时，接下来PC送出的下　个byte就用来设定PORT 3的输出。
　(5) 当PC端经由RS232传送T时，接下来PC连续送出五个bytes，这五个bytes是 "年月日时分"，这是 PC 用来设定实验板的时间日期。
　(6) 8051每　分钟就读入ADC0804转换的数字温度数据，然后通过RS232传送给PC端，再由PC端通过网络传送到远端的电脑。*/
**********************************************************
#include <REGX51.H>
#include <lcd.h>
#define   XTAL            11059200
#define   baudrate        9600
#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          P2_0
#define   adc_wr          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 command[9][6]={"Watch","One  ","Two  ","Three",
                           "Four ","Five ","Six  ","Seven","Eight"};
char code int2char[]="0123456789";
unsigned char txOK,c;
void display_tempreture(unsigned char number)
{
        unsigned char x,y;
        y=(number<<1) - 263;
        SBUF=y+32;
        txOK=0;
        x=y/10;
        gotoxy(1,9);
        write_LCD_data(int2char[x]);
        x=y%10;
        write_LCD_data(int2char[x]);
}
char gotkey();
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(today.year);
        display_LCD_string("/");
        display_LCD_number(today.month);
        display_LCD_string("/");
        display_LCD_number(today.day);
        display_LCD_string(" ");
        if(today.month > 1)
             for(i=0;i<=today.month-2;i++)
                   days+=(dayofmonth[i]%7);
        if( today.year !=0 ) days+=((today.year-1)/4)+today.year+1;
        if (today.year%4==0 && today.month >2) days++;
        days=(days+today.day) % 7;
        display_LCD_string(&weekday[days][0]);
}
int getdigit(unsigned char x,unsigned char y)
{
        char    keys;
        do {
                gotoxy(x,y);
                putchar('_');
                keys=gotkey();
                gotoxy(x,y);
                putchar(int2char[keys]);
        } while(keys>9);
        return(keys);
}
int gettime()
{
        char temp;
        do {
           while((temp=getdigit(1,0))>2); //时的十位数不能大于2
           temp=temp*10+getdigit(1,1);
           if (temp > 23) display_time();
        } while (temp > 23);
        display.hour=temp;
        while((temp=getdigit(1,3))>5);
        display.minute=temp*10+getdigit(1,4); 
        return(TRUE);
}
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
}
int getdate()
{
        char temp,days;
        temp=getdigit(2,2);
        tmpday.year=temp*10+getdigit(2,3); 
        do {
             while((temp=getdigit(2,5))>1); //月的十位数不能大于1
            temp=temp*10+getdigit(2,6);
             if (temp > 12) display_date(); //月份的数字不能大于12
        } while (temp > 12);
        tmpday.month=temp;
        do {
             while((temp=getdigit(2,8))>3); //日的十位数不能大于3
            temp=temp*10+getdigit(2,9);
            days=monthday(tmpday.year,tmpday.month);
//如果输入的日期大于该月份的日期就重新输入
        if(temp > days || temp==0) display_date();
   } while (temp > days || temp==0);
   tmpday.day=temp;
   return(TRUE);
}
static void timer0_isr(void) interrupt  TF0_VECTOR using 1
{
        TR0=0;
        TL0=(TIMER0_COUNT & 0x00FF);
        TH0=(TIMER0_COUNT >> 8);
        TR0=1;
        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
              adc_wr=0;
              now.minute++;                 //分加1
              adc_wr=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
                                  }
                           }
                           display_date();
             }
        }
    }
    if (operation==SET ) return;
    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
{
        unsigned char temp;
        if(RI) {
                temp=SBUF;
                if (temp=='S') {
                        mode=1;
                        RI=0;
                        return;
                }
                if (temp=='T') {
                        mode=2;
                        c=0;
                        RI=0;
                        return;
                }
                if (mode==1) {
                        temp=SBUF;
                        P2=SBUF;
                        gotoxy(1,14);
                        putchar(int2char[temp]);
                        mode=0;
                        RI=0;
                        return;
                }
                if (mode==2) {
                        temp=SBUF;
                        switch(c) {
                           case 0 : today.year=temp;
                                            break;
                           case 1 : today.month=temp;
                                            break;
                           case 2 : today.day=temp;
                                            break;
                           case 3 : now.hour=temp;
                                            break;
                           case 4 : now.minute=temp;
                                            break;
                        }
                        c++;
                        if (c==5) {
                           mode=0;
                           display_date();
                           display_time();
                        }
                        RI=0;
                        return;
                }
        }
        if(TI!=0) { 
                TI=0;
                txOK=1;
        }
}
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;
}
void main (void)  {
        char keys;
        txOK=1;
        init_LCD();
        clear_LCD();
        gotoxy(2,0);
        display_LCD_string("20");
        display=now;
        display_time();
        display_date();
        EA=1;
        com_initialize();
        timer0_initialize();
        IT0=1;
        EX0=1;
        do {
                keys=gotkey();
                if(keys==SET) {
                     operation=SET;
                if ( gettime()) now=display;
                if ( getdate()) {
                     today=tmpday;
                     display_date();
                        }
                }
                operation=0;
        } while(1);
}