用DS1302与1602LCD设计的可调式电子日历与时钟屏幕不显示字符求指导 -

#include<reg51.h>
#include<string.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit SDA=P1^0; //1302的IO口
sbit CLK=P1^1; //1302的时钟线
sbit RST=P1^2; //1302的复位线
sbit RS=P2^0; //1602寄存器选择
sbit RW=P2^1; //1602读写控制
sbit E=P2^2; //1602的启动
sbit K1=P3^4; //调时选择
sbit K2=P3^5; //加
sbit K3=P3^6; //减
sbit K4=P3^7; //确定
uchar tcount=0;
uchar monthsdays[]={0,31,0,31,30,31,30,31,31,30,31,30,31};
uchar*week[]={"SUN","MON","TUS","WEN","THU","FRI","SAT"};
uchar LCD_buffer1[]={"DATE 00-00-00 "};
uchar LCD_buffer2[]={"TIME 00-00-00 "};
uchar datetime[7];
char adjust_index=-1;
uchar change_flag[]="-MHDM-Y";
void delay(uint z);
void set_ds1302();
void gettime();
uchar read_date(uchar addr);
void write_ds1302(uchar addr,uchar dat);
void write_a_byte_to_ds1302(uchar x);
uchar get_a_byte_from_ds1302();
uchar read1602state();
void busy_wait();
void write_date(uchar dat);
void write_com(uchar cmd);
void init_lcd1602();
void set_weizhi(uchar p);
void display_string(uchar p,uchar*s);
void format_datetime(uchar d,uchar*a);
uchar runnian(uint y);
void refresh_week_day();
void datetime_adjust(char x);
/////////主程序
void main()
{
init_lcd1602();
IE=0x83;
IP=0x01;
IT0=1;
TMOD=0X01;
TH0=5000/256;
TL0=5000%256;
TR0=1;
while(1)
{
if(adjust_index==-1)
gettime();
}
}
/////////////////延时
void delay(uint z)
{
uchar i;
while(z--)
for(i=0;i<120;i++);
}
////////////设置时间
void set_ds1302()
{
uchar i;
write_ds1302(0x8e,0x00);
for(i=1;i<7;i++)
{
write_ds1302(0x80+2*i,(datetime[i]/10<<4)|(datetime[i]%10));
}
write_ds1302(0x8e,0x80);
}
/////////////读取当前日期时间
void gettime()
{
uchar i;
for(i=0;i<7;i++)
{
datetime[i]=read_date(0x81+2*i);
}
}
/////////////从1302指定位置读数
uchar read_date(uchar addr)
{
uchar dat;
RST=0;
CLK=0;
RST=1;
write_a_byte_to_ds1302(addr);
dat=get_a_byte_from_ds1302();
CLK=1;
RST=0;
return dat;
}
//////////////向1302某地址写数据
void write_ds1302(uchar addr,uchar dat)
{
CLK=0;
RST=1;
write_a_byte_to_ds1302(addr);
write_a_byte_to_ds1302(dat);
CLK=0;
RST=0;
}
/////////////向1302写入一个字节
void write_a_byte_to_ds1302(uchar x)
{
uchar i;
for(i=0;i<8;i++)
{
SDA=x&0X01;
CLK=1;
CLK=0;
x>>=1;
}
}
/////////从1302中读取一个字节
uchar get_a_byte_from_ds1302()
{
uchar i,b=0x00;
for(i=0;i<8;i++)
{
b=_crol_((uchar)SDA,i);
CLK=1;
CLK=0;
}
return b/16*10+b%16;
}
/////////读1602状态
uchar read1602state()
{
uchar state;
RS=0;
RW=1;
E=1;
delay(1);
state=P0;
E=0;
delay(1);
return state;
}
//1602忙等待
void busy_wait()
{
while((read1602state()&0x80)==0x80);
delay(5);
}
//向1602写数据
void write_date(uchar dat)
{
busy_wait();
RS=1;
RW=0;
E=0;
P0=dat;
E=1;
delay(1);
E=0;
}
//////向1602写指令
void write_com(uchar cmd)
{
busy_wait();
RS=0;
RW=0;
E=0;
P0=cmd;
delay(1);
E=0;
}
///1602初始化
void init_lcd1602()
{
write_com(0x38);
delay(1);
write_com(0x01);
delay(1);
write_com(0x06);
delay(1);
write_com(0x0c);
delay(1);
}
//设置1602显示位置
void set_weizhi(uchar p)
{
write_com(p|0x80);
}
void display_string(uchar p,uchar*s)
{
uchar i;
set_weizhi(p);
for(i=0;i<16;i++)
{
write_date(s[i]);
delay(1);
}
}
//日期时间值转化为数字字符
void format_datetime(uchar d,uchar*a)
{
a[0]=d/10+'0';
a[1]=d%10+'0';
}
///判断闰年
uchar runnian(uint y)
{
return(y%4==0&&y%100!=0||(y%400==0));
}
///////求2000 1.1开始任何一天是星期几
//////////求总天数后再求星期几
void refresh_week_day()
{
uint i,d,w=5;
for(i=2000;i<2000+datetime[6];i++)
{
d=runnian(i)?366:365;
w=(w+d)%7;
}
d=0;
for(i=1;i<datetime[4];i++)
d+=monthsdays[i];
d+=datetime[3];
datetime[5]=(w+d)%7+1;
}
///调整处理
void EX_INT0() interrupt 0
{
if(K1==0)
{
while(K1==0);
if(adjust_index==-1||adjust_index==1)
adjust_index=7;
adjust_index--;
if(adjust_index==5)adjust_index=4;
LCD_buffer2[13]='[';
LCD_buffer2[14]=change_flag[adjust_index];
LCD_buffer2[15]=']';
}
else
if(K2==0)
{
while(K2==0);
datetime_adjust(1);
}
else
if(K3==0)
{
while(K3==0);
datetime_adjust(-1);
}
else
if(K4==0)
{
while(K4==0);
set_ds1302();
LCD_buffer2[13]=' ';
LCD_buffer2[14]=' ';
LCD_buffer2[15]=' ';
adjust_index=-1;
}
}
//分时日月年加减
void datetime_adjust(char x)
{
switch(adjust_index)
{
case 6:
if(x==1&&datetime[6]<99)datetime[6]++;
if(x==-1&&datetime[6]>0)datetime[6]--;
monthsdays[2]=runnian(2000+datetime[6]?29:28);
if(datetime[3]>monthsdays[datetime[4]])
datetime[3]=monthsdays[datetime[4]];
refresh_week_day();
break;
case 4:
if(x==1&&datetime[4]<12)
datetime[4]++;
if(x==-1&&datetime[4]>1)
datetime[4]--;
monthsdays[2]=runnian(2000+datetime[6])?29:28;
if(datetime[3]>monthsdays[datetime[4]])
datetime[3]=monthsdays[datetime[4]];
refresh_week_day();
break;
case 3:
monthsdays[2]=runnian(2000+datetime[6])?29:28;
if(x==1&&datetime[3]<monthsdays[datetime[4]])
datetime[3]++;
if(x==-1&&datetime[3]>0)
datetime[3]--;
refresh_week_day();
break;
case 2:
if(x==1&&datetime[2]<23)
datetime[2]++;
if(x==-1&&datetime[2]>0)
datetime[2]--;
break;
case 1:
if(x==1&&datetime[1]<59)
datetime[1]++;
if(x==-1&&datetime[1]>0)
datetime[1]--;
break;
}
}
void T0_INT() interrupt 1
{
TH0=5000/256;
TL0=5000%256;
if(++tcount!=2)return;
tcount=0;
format_datetime(datetime[6],LCD_buffer1+5);
format_datetime(datetime[4],LCD_buffer1+8);
format_datetime(datetime[3],LCD_buffer1+11);
strcpy(LCD_buffer1+13,week[datetime[5]-1]);
format_datetime(datetime[2],LCD_buffer2+5);
format_datetime(datetime[1],LCD_buffer2+8);
format_datetime(datetime[0],LCD_buffer2+11);
display_string(0x00,LCD_buffer1);
display_string(0x40,LCD_buffer2);
}

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