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//寫(xiě)的時(shí)候，是低電平改變數(shù)據(jù)，上升沿送入數(shù)據(jù)
//讀的時(shí)候，是低電平讀入數(shù)據(jù)，下降沿使得從設(shè)備把數(shù)據(jù)放到總線上
//讀的時(shí)候，是低電平讀，但沒(méi)有讀出，提供下降沿使得從設(shè)備把數(shù)據(jù)放到總線上
#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit rs="P2"^4;
sbit rw="P2"^5;
sbit en="P3"^6;
sbit reset="P3"^3;
sbit sclk="P3"^0;
sbit io="P3"^1;
uchar str1[]="date of today is:";
uchar init[]={0x00,0x00,0x21,0x21,0x10,0x01,0x04};//秒，分，時(shí)，日，月，星期，年
//
void delay()
{uchar j;
for(j=250;j>0;j--);
}
//-------------------液晶模塊-----------------//
void en_toggle()
{
en=0;
//_nop_();
delay();
en=1;
delay();
// _nop_();
en=0;
} //注意必須加延時(shí)，否則會(huì)出問(wèn)題的
void is_ready()
{
P2=0x00;//設(shè)置為輸入口 //注意：現(xiàn)實(shí)中應(yīng)該送0xff
rs=0;
rw=1;
en=1;
while(bflag);
en=0;
}
void write_cmd(uchar cmd)
{
is_ready();
rs=0;
rw=0;
P2=cmd;
en_toggle();
_nop_();
}
void write_data(uchar indata)
{
is_ready();
rs=1;
rw=0;
P2=indata;
en_toggle();
_nop_();
}
void write_str(uchar addr,uchar *p)
{
uchar i;
write_cmd(addr);
while(p[i]!='\0')
{write_data(p[i]);
i++;
}
}
void write_position(uchar row,uchar col)
{uchar p;
if(row==1)
{p=0x80+col-1;
write_cmd(p);}
else
{p=0xc0+col-1;
write_cmd(p);
}
}
void init_lcd()
{
write_cmd(0x38);
write_cmd(0x0c);
write_cmd(0x06);
write_cmd(0x01);//清屏幕
}
//------------液晶模塊結(jié)束---------------------
//-----------ds1302模塊開(kāi)始-------------------
//注意點(diǎn)：sclk的上升沿輸入數(shù)據(jù)，sclk的下跳沿輸出數(shù)據(jù)
//讀寫(xiě)時(shí)都是從第0位開(kāi)始
void write_byte(uchar inbyte)
{
uchar i;
for(i=8;i>0;i--)
{
sclk=0; //寫(xiě)的時(shí)候低電平改變數(shù)據(jù)
if(inbyte&0x01)
io=1;
else
io=0;
sclk=1; //寫(xiě)的時(shí)候高電平，把數(shù)據(jù)寫(xiě)入ds1302
_nop_();
inbyte=inbyte>>1;
}
}
uchar read_byte() //sclk的下跳沿讀數(shù)據(jù)
{
uchar i,temp=0;
io=1; //設(shè)置為輸入口
for(i=7;i>0;i--)
{
sclk=0;
if(io==1)
temp=temp|0x80;
else
temp=temp&0x7f;
sclk=1; //產(chǎn)生下跳沿
temp=temp>>1;
}
return (temp);
}
//----------往ds1302的某個(gè)地址寫(xiě)入數(shù)據(jù)-------------
void write_ds1302(uchar cmd,uchar indata)
{
reset=1;
write_byte(cmd);
write_byte(indata);
reset=0;
sclk=0;
}
//----------讀ds1302某地址的的數(shù)據(jù)-----------------
uchar read_ds1302(uchar addr)
{
uchar backdata;
reset=1;
write_byte(addr);
backdata=read_byte();//先寫(xiě)地址，然后讀數(shù)據(jù)
reset=0;
sclk=0;
return (backdata);
}
//------------設(shè)置初始時(shí)間-------------------
void set_ds1302(uchar addr,uchar *p,uchar n)//寫(xiě)入n個(gè)數(shù)據(jù)
{
write_ds1302(0x8e,0x00);//寫(xiě)控制字，允許寫(xiě)操作
for(;n>0;n--)
{write_ds1302(addr,*p);
p++;
addr=addr+2;
}
write_ds1302(0x8e,0x80);//寫(xiě)保護(hù)，不允許寫(xiě)
}
//----------- 讀取當(dāng)前時(shí)間-------------------
void read_nowtime(uchar addr,uchar *p,uchar n)
{
for(;n>0;n--)
{
*p=read_ds1302(addr);
p++;
addr=addr+2;
}
}
void init_ds1302()
{
reset=0;
sclk=0;
write_ds1302(0x80,0x00);//寫(xiě)控制字，允許寫(xiě)
write_ds1302(0x90,0x00);//禁止渦流充電
}
//-----------ds1302模塊結(jié)束-------------------
void main()
{
init_lcd(); //初始化LCD
write_str(0x80,str1); //液晶顯示提示信息
init_ds1302(); //初始化ds1302
set_ds1302(0x80,init,7);//設(shè)置初始時(shí)間，日期，年月
//如果不設(shè)置初始化時(shí)間的話，則默認(rèn)為系統(tǒng)時(shí)間
while(1)
{
read_nowtime(0x81,init,7); //讀出當(dāng)前時(shí)間，讀出7個(gè)字節(jié)
write_position(2,1);
write_data('0'+((init[2]&0xf0)>>4));
write_position(2,2);
write_data('0'+(init[2]&0x0f)); //讀小時(shí)
write_position(2,3);
write_data(':');
write_position(2,4);
write_data('0'+((init[1]&0xf0)>>4));
write_position(2,5);
write_data('0'+(init[1]&0x0f)); //讀分鐘
write_position(2,6);
write_data(':');
write_position(2,7);
write_data('0'+((init[0]&0xf0)>>4));
write_position(2,8);
write_data('0'+(init[0]&0x0f)); //讀秒
write_position(2,13);
write_data('0'+((init[6]&0xf0)>>4));
write_position(2,14);
write_data('0'+(init[6]&0x0f)); //讀年
write_position(2,15);
write_data('/');
write_position(2,16);
write_data('0'+((init[4]&0xf0)>>4));
write_position(2,17);
write_data('0'+(init[4]&0x0f)); //讀月
write_position(2,18);
write_data('/');
write_position(2,19);
write_data('0'+((init[3]&0xf0)>>4));
write_position(2,20);
write_data('0'+(init[3]&0x0f)); //讀日
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