//參考程序C  :WDS12887LCD.c	此程序讀取時鐘值，并年，月，日，時，分，秒.
//分別顯示在LCD屏上。可實現(xiàn)時鐘初始化(授時)
#include <c8051f020.h>          // SFR declarations
#include <intrins.h>
#define CS12887		0x8300		/*DS12887時間寄存器首地址*/
#define	CS12887A	0x830A		/*DS12887內(nèi)部寄存器A地址*/
#define	CS12887B	0x830B		/*DS12887內(nèi)部寄存器B地址*/
#define	CS12887C	0x830C		/*DS12887內(nèi)部寄存器C地址*/
unsigned long x;
unsigned char *lcdpoint;         /*指向 lcddata數(shù)組的指針*/
unsigned char lcd_data_count;    /*要顯示的數(shù)據(jù)個數(shù) */
void PORT_Init (void);
void sleep_ms(unsigned int count)
{
  unsigned int ii,jj;
  for(ii=0;ii<count;ii++)
    {
      for(jj=0;jj<250;jj++)
	  _nop_();			
    }	
}
void SYSCLK_Init (void)
{
 OSCICN = 0x05;       /*系統(tǒng)時鐘初始化為片內(nèi)的4MHz*/
                                      
 }
 void DS12887INIT(void)
{
	unsigned char i;
	unsigned char xdata *idata Point1;	
	Point1=CS12887B;
	*Point1=0x80;		/*設(shè)置SET=1,禁止時間更新*/
	Point1=CS12887;
	*Point1=0x00;		/*寫入當(dāng)前秒值："30"秒*/
	Point1++;
	*Point1=0xff;		/*秒不報警（不鬧秒）*/
	Point1++;
	*Point1=0x0;		/*寫入當(dāng)前分值:"58"分*/
	Point1++;
	*Point1=0xff;		/*分不報警（不鬧分）*/
	Point1++;
	*Point1=0x21;		/*寫入當(dāng)前時值:"16" 時*/
	Point1++;
	*Point1=0xff;		/*時不報警（不鬧時)*/
	Point1++;
	*Point1=0x05;		/*寫入當(dāng)前周日："5"*/
	Point1++;
	*Point1=0x6;		/*寫入當(dāng)前日期："05"日*/
	Point1++;
	*Point1=0x10;		/*寫入當(dāng)前月份："08"月*/
	Point1++;
	*Point1=0x05;		/*寫入當(dāng)前年份："05"年*/
	Point1=CS12887C;
	i=*Point1;			/*CLEAR C*/
	Point1++;
	i=*Point1;			/*CLEAR D*/
	Point1=CS12887B;	/*更新周期正常運(yùn)行，禁止中斷，采用BCD碼格式，24[小]時制*/
	*Point1=0x02;		/*不用復(fù)時制*/
}
void PORT_Init (void)
{
   //XBR2    = 0x40;      /*時能交叉開關(guān)，弱上拉*/
   P74OUT  = 0xff;		/*推挽輸出*/
   EMI0CF |= 0x2c;		/*EMIF工作在地址/數(shù)據(jù)復(fù)用方式，只用外部存儲器，ALE高/低脈寬占1個SYSCLK周期*/
   EMI0TC |= 0x6c;		/*地址建立/保持時間占0個SYSCLK周期，/WR和/RD占12個SYSCLK周期*/
}
void LCD_Init(void)
{
   P6 = 0x01;
   for(x=0;x<50000;x++);
   //P7 = 0x30;				/*一行顯示*/
   P7 = 0x38;				/*兩行顯示*/
   P6 = 0x0;
   P6 = 0x1; 
   for(x=0;x<1000;x++);
   P7 = 0x0e;				/*顯示開，光標(biāo)顯示，光標(biāo)不閃爍*/
   P6 = 0x0;
   P6 = 0x1;
   for(x=0;x<1000;x++);
   P7= 0x06;				/*顯示增加，不平移*/
   P6 = 0x0;
   P6 = 0x1;
   for(x=0;x<5000;x++);
   P7 = 0x01;				/*清屏*/
   P6 = 0x0;
   P6 = 0x1; 
   for(x=0;x<5000;x++);
}
void main (void) {
	unsigned char temp,data1;
	unsigned char TimeVal[10];
	unsigned char xdata  *idata Pointm;
	unsigned char HMS[10]={0x70,0x70},YMD[10]={0x02,0x00};	
  	WDTCN = 0xde;  /*無效看門狗*/
   	WDTCN = 0xad;
   	SYSCLK_Init ();			/*初始化系統(tǒng)時鐘*/
	PORT_Init ();			    /*初始化端口*/
                 //DS12887INIT();			/*時鐘芯片授時*/
                  LCD_Init();               /*LCD初始化*/
   	//sleep_ms(4000);
do{
temp=temp&0x7f;	/*UIP=0*/
Pointm=CS12887A;/*判斷更新周期結(jié)束否？查詢UIP位*/
temp=*Pointm;
temp=temp&0x80;	/*UIP=0,時鐘更新已經(jīng)完成，可以讀取時鐘值*/
}while(temp==0x80);/*UIP=1,時鐘更新周期正在進(jìn)行，不能讀取時鐘值，需繼續(xù)等待*/
	while(1)
	{
   		P7 = 0x02;			/*回到起始位置*/
   		P6 = 0x0;
   		P6 = 0x01; 
   		Pointm=CS12887;
		for(temp=0;temp<10;temp++)	/*讀時間寄存器*/
		{
			TimeVal[temp]=*Pointm;
			Pointm++;
			switch(temp){	/*準(zhǔn)備待顯示的時間數(shù)據(jù)*/
				case 0x00:
					HMS[7]=0x0a;
					HMS[8]=(TimeVal[temp]>>4);
					HMS[9]=TimeVal[temp]&0x0f;
					break;
				case 0x02:
					HMS[4]=0x0a;
					HMS[5]=(TimeVal[temp]>>4);
					HMS[6]=TimeVal[temp]&0x0f;
					break;
				case 0x04:
					HMS[2]=(TimeVal[temp]>>4);
					HMS[3]=TimeVal[temp]&0x0f;
					break;
				case 0x07:
					YMD[7]=0x0a;
					YMD[8]=(TimeVal[temp]>>4);
					YMD[9]=TimeVal[temp]&0x0f;
					break;
				case 0x08:
					YMD[4]=0x0a;
					YMD[5]=(TimeVal[temp]>>4);
					YMD[6]=TimeVal[temp]&0x0f;
					break;
				case 0x09:
					YMD[2]=(TimeVal[temp]>>4);
					YMD[3]=TimeVal[temp]&0x0f;
					break;
				default:
					_nop_();
			}
		}
Pointm=CS12887C;
temp=*Pointm;			/*CLEAR C*/
Pointm++;
temp=*Pointm;			/*CLEAR D*/
Pointm=CS12887B;	/*更新周期正常運(yùn)行，禁止中斷，采用BCD碼格式，24[小]時制*/
*Pointm=0x02;		/*不用復(fù)時制*/
_nop_();
 P6  = 0x05;                             //準(zhǔn)備送數(shù)據(jù)
  for(x=0;x<5000;x++);
lcdpoint=&YMD;
for(lcd_data_count=10;lcd_data_count>0;lcd_data_count--)     //顯示第一行字符
{ 
data1=*lcdpoint;
data1 += 0x30;		/*轉(zhuǎn)化成字符碼*/
P7 = data1; 		/*送字符數(shù)據(jù)*/
P6 = 0x04;
P6 = 0x05;
lcdpoint++;
for(x=0;x<100;x++);
}
		P6 = 0x01;
	  P7 = 0xc0;		/*切換到第二行*/
   		P6 = 0x00;	
   		P6 = 0x01; 	
   		for(x=0;x<1000;x++);
	    lcdpoint=&HMS;
	    for(lcd_data_count=10;lcd_data_count>0;lcd_data_count--)     //顯示第二行字符
	    { 
		    data1=*lcdpoint;
			data1 += 0x30;		/*轉(zhuǎn)化成字符碼*/
		    P7 = data1; 		/*送字符數(shù)據(jù)*/
			P6 = 0x04;
	        P6 = 0x05;
	        lcdpoint++;
			for(x=0;x<100;x++);
		}
	}
}