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#include<reg51.h>
#include<string.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit SDA = P3^4;// 實物
sbit CLK = P3^6;
sbit RST = P3^5;
sbit EN = P2^7;
sbit RW = P2^5;
sbit RS = P2^6;
sbit K1 = P3^1;
sbit K2 = P3^0;
sbit K3 = P3^2;
sbit K4 = P3^3;
uchar tCount = 0;
//一年中每個月的天數，2月的天數由年份決定
uchar MonthsDays[] = { 0,31,0,31,30,31,30,31,31,30,31,30,31 };
uchar *WEEK[]= {"SUN","MON","TUS","WEN","THU","FRI","SAT"};
//LCD顯示緩沖
uchar LCD_DSY_BUFFER1[] = {"DATE 00-00-00 "};//？？？為什么要空4鍵？----為后面的YMHD等留空間
uchar LCD_DSY_BUFFER2[] = {"TIME 00:00:00 "};
uchar DateTime[7] = {0, 0, 0x12, 0x01, 0x01, 0x02, 0x13}; //所讀取的日期時間
char Adjust_Index = -1;//當前調節的時間對象（不調節秒與周）
uchar Change_Flag[] = "-MHDM-Y";
//----------------------------------------------------
//延時
//----------------------------------------------------
void DelayMS(uint x)
{
uchar i;
while(x--) for(i=0;i<120;i++);
}
//----------------------------------------------------
//向DS1302寫入一個字節
//----------------------------------------------------
void Write_A_Byte_TO_DS1302(uchar x)
{
uchar i;
for(i=0;i<8;i++)
{
SDA = x & 0x01;
x >>= 1;
CLK = 1;
_nop_();
CLK = 0;
_nop_();
}
}
//----------------------------------------------------
//從DS1302讀取一字節
//----------------------------------------------------
uchar Get_A_Byte_FROM_DS1302()
{
uchar i,b,t;
for(i = 0 ;i < 8 ;i++)
{
t = SDA;
b = (b>>=1) | (t<<7); //3
CLK = 1;
_nop_();
CLK = 0;
_nop_();
}
//BCD碼轉換
return b / 16 * 10+ b % 16;
}
//------------------------------------------------------
//向DS1302某地址寫入數據
//------------------------------------------------------
void Write_DS1302(uchar addr,uchar dat)
{
RST = 0;
_nop_();
CLK = 0;
_nop_();
RST = 1;
_nop_();
Write_A_Byte_TO_DS1302(addr);
Write_A_Byte_TO_DS1302(dat);
RST = 0;
_nop_();
}
//------------------------------------------------------
//從DS1302指定位置讀數據
//------------------------------------------------------
uchar Read_Data(uchar addr)
{
uchar dat;
RST = 0;
_nop_();
CLK = 0;
_nop_();
RST = 1;
_nop_();
Write_A_Byte_TO_DS1302(addr);
dat = Get_A_Byte_FROM_DS1302();
RST = 0; //2.以下為DS1302復位的穩定時間,必須的。
_nop_();
CLK = 1;
_nop_();
SDA = 0;
_nop_();
SDA = 1;
_nop_();
// CLK =1;
// RST=0;
return dat;
}
//------------------------------------------------------
//設置時間
//------------------------------------------------------
void SET_DS1302() //（初始化）
{
uchar i;
//寫控制字，取消寫保護
Write_DS1302(0x8E,0x00);
//分時日年月依次寫入
for(i = 1; i < 7; i++ )
{
Write_DS1302(0x80 + 2*i, (DateTime[i]/10<<4) | (DateTime[i]%10));
}
Write_DS1302(0x8E,0x80);//加保護
}
//----------------------------------------------------
//讀取當前日期時間
//----------------------------------------------------
void GetTime()
{
uchar i;
for(i = 0; i < 7; i++)
{
DateTime[i] = Read_Data(0x81 + 2*i);
}
}
//------------------------------------------------------
//1602LCD的若干控制代碼
//------------------------------------------------------
uchar Read_LCD_State(){
uchar state;
RS=0;RW=1;EN=1;DelayMS(1);state = P0; EN = 0; DelayMS(1);
return state;
}
//------------------------------------------------------
//忙等待
//-------------------------------------------------------
void LCD_Busy_Wait()
{
while((Read_LCD_State() & 0x80) == 0x80);
DelayMS(5);
}
//------------------------------------------------------
//向LCD寫數據
//------------------------------------------------------
void Write_LCD_Data(uchar dat)
{
LCD_Busy_Wait();
RS = 1;
RW = 0;
EN = 0;
P0 = dat;
DelayMS(1);
EN = 1;
DelayMS(5);
EN = 0;
}
//------------------------------------------------------
//寫LCD指令
//------------------------------------------------------
void Write_LCD_Command(uchar cmd)
{
LCD_Busy_Wait();
RS = 0;
RW = 0;
EN = 0;
P0 = cmd;
DelayMS(1);
EN = 1;
DelayMS(5);
EN = 0;
}
//------------------------------------------------------
//LCD初始化
//------------------------------------------------------
void Init_LCD()
{
Write_LCD_Command(0x38);DelayMS(1);
Write_LCD_Command(0x0F);DelayMS(1);
Write_LCD_Command(0x01);DelayMS(1);
Write_LCD_Command(0x06);DelayMS(1);
Write_LCD_Command(0x0c);DelayMS(1);
}
//------------------------------------------------------
//設置液晶顯示位置
//------------------------------------------------------
void Set_LCD_POS(uchar p)
{
Write_LCD_Command(p | 0x80);
}
//------------------------------------------------------
//在LCD上顯示字符串
//------------------------------------------------------
void Display_LCD_String(uchar p,uchar *s)
{
uchar i;
Set_LCD_POS(p);
for(i = 0;i<16;i++)
{
Write_LCD_Data(s[i]);
DelayMS(1);
}
}
//------------------------------------------------------
//日期與時間值轉換為數字字符
//------------------------------------------------------
void Format_DateTime(uchar d, uchar *a)
{
a[0] = d / 10+'0'; a[1] = d % 10 + '0';
}
//------------------------------------------------------
//判斷是否為閏年
//------------------------------------------------------
uchar isLeapYear(uint y)
{
return (y & 4 == 0 && y & 100 != 0) || (y & 400 == 0);
}
//------------------------------------------------------
//求星期幾
//------------------------------------------------------
void RefreshWeekDay()
{
uint i,d,w = 5;
for(i = 2000;i< 2000 + DateTime[6];i++)
{
d = isLeapYear(i) ? 366 : 365;
w = (w + d) % 7;
}
d = 0;
for(i = 1;i < DateTime[4] ;i++ ) d += MonthsDays[i];
d += DateTime[3];
//保存星期，0~6表示星期日，星期一，二，,,,六，為了與DS1302星期格式匹配，返回值需要加1
DateTime[5] = (w + d) % 7 + 1;
}
//------------------------------------------------------
//年月日時分++ / --
//------------------------------------------------------
void DateTime_Adjust(char x)
{
switch ( Adjust_Index )
{
case 6://年00-99
if(x == 1 && DateTime[6] < 99 ) DateTime[6]++;
if(x == -1 && DateTime[6] > 0 ) DateTime[6]--;
MonthsDays[2] = isLeapYear(2000 + DateTime[6]) ? 29 : 28;
if(DateTime[3] > MonthsDays[DateTime[4]] )
DateTime[3] = MonthsDays[DateTime[4]];
RefreshWeekDay();
break;
case 4://月
if(x == 1 && DateTime[4] < 12 ) DateTime[4]++;
if(x ==-1 && DateTime[4] > 1 ) DateTime[4]--;
MonthsDays[2] = isLeapYear(2000 + DateTime[6]) ? 29 : 28;
if(DateTime[3] > MonthsDays[DateTime[4]] )
DateTime[3] = MonthsDays[DateTime[4]];
RefreshWeekDay();
break;
case 3://日
MonthsDays[2] = isLeapYear(2000 + DateTime[6]) ? 29 : 28;
if(x == 1 && DateTime[3] < MonthsDays[DateTime[4]] ) DateTime[3]++;
if(x == -1 && DateTime[3]>0 ) DateTime[3]--;
RefreshWeekDay();
break;
case 2://時
if(x == 1 && DateTime[2] < 23 ) DateTime[2]++;
if(x ==-1 && DateTime[2] > 0 ) DateTime[2]--;
break;
case 1://分
if(x == 1 && DateTime[1]<59 ) DateTime[1]++;
if(x == -1 && DateTime[1]>0 ) DateTime[1]--;
break;
}
}
//------------------------------------------------------
//定時器0每秒刷新LCD顯示
//------------------------------------------------------
void T0_INT() interrupt 1
{
TH0 = -5000 / 256;
TL0 = -5000 % 256;
if( ++tCount != 2 ) return;
tCount = 0;
//按指定格式生成待顯示的日期時間串
Format_DateTime(DateTime[6],LCD_DSY_BUFFER1 + 5);
Format_DateTime(DateTime[4],LCD_DSY_BUFFER1 + 8);
Format_DateTime(DateTime[3],LCD_DSY_BUFFER1 + 11);
//星期
strcpy(LCD_DSY_BUFFER1 + 13,WEEK[DateTime[5] - 1]);
//時分秒
Format_DateTime(DateTime[2],LCD_DSY_BUFFER2 + 5);
Format_DateTime(DateTime[1],LCD_DSY_BUFFER2 + 8);
Format_DateTime(DateTime[0],LCD_DSY_BUFFER2 + 11);
//顯示年月日、星期、時分秒
Display_LCD_String(0x00,LCD_DSY_BUFFER1);
Display_LCD_String(0x40,LCD_DSY_BUFFER2);
}
//------------------------------------------------------
//鍵盤中斷
//------------------------------------------------------
void EX_INT0() interrupt 0
{
if(K1==0)//選擇調整對象（Y M D H M）
{
while(K1==0);
if (Adjust_Index == -1 || Adjust_Index == 1 )Adjust_Index = 7;
Adjust_Index --;
if (Adjust_Index == 5) Adjust_Index = 4;//跳過對星期的調節
LCD_DSY_BUFFER2[13] = '[';
LCD_DSY_BUFFER2[14] = Change_Flag[Adjust_Index];
LCD_DSY_BUFFER2[15] = ']';
}
else
if(K2==0)//加
{
while(K2==0);DateTime_Adjust(1);
}
else
if(K3==0)//減
{
while(K3==0);DateTime_Adjust(-1);
}
else
if(K4==0)//確定
{
while(K4==0);
SET_DS1302();//將調整后的時間寫入DS1302
LCD_DSY_BUFFER2[13] = ' ';
LCD_DSY_BUFFER2[14] = ' ';
LCD_DSY_BUFFER2[15] = ' ';
Adjust_Index = -1;//操作索引重設為-1，時間繼續正常顯示
}
}
//------------------------------------------------------
//主程序
//------------------------------------------------------
//void Int0Configuration()
//{
// //設置INT0
// IT0=1;//跳變沿出發方式（下降沿）
// EX0=1;//打開INT0的中斷允許。
// EA=1;//打開總中斷
//}
void main()
{
Init_LCD();//液晶初始化
IE = 0x83;//允許INT0,T0中斷
IP = 0x01;
IT0 = 0X01;
TMOD = 0x01;
TH0 = -5000 / 256;
TL0 = -5000 % 256;
TR0 = 1;
while(1)
{
//如果未執行調整操作則正常讀取當前時間
if(Adjust_Index == -1) GetTime();
}
}

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