for(j=0;j<112;j++);
}
//功能:
12us延时
//STC89C52为1T单片机,即1个时钟/机器周期,速度为AT89C52的12倍
voidDelay_xus(uintt)
{
for(;t>0;t--)
{
_nop_();
}
}
//控制LCD写时序
voidLCD_en_write(void)
{
CS=1;
Delay_xus(20);
CS=0;
Delay_xus(20);
}
//写指令函数
voidWrite_Instruction(ucharcommand)
{
RS=0;
RW=0;
CS=1;
LCDDATA=command;
LCD_en_write();//写入指令数据
}
//写数据函数
voidWrite_Data(ucharWdata)
{
RS=1;
RW=0;
CS=1;
LCDDATA=Wdata;
LCD_en_write();//写入数据
}
//字符显示初始地址设置
voidLCD_SET_XY(ucharX,ucharY)
{
ucharaddress;
if(Y==0)
address=0x80+X;//Y=0,表示在第一行显示,地址基数为0x80
else
address=0xc0+X;//Y非0时,表时在第二行显示,地址基数为0xC0
Write_Instruction(address);//写指令,设置显示初始地址
}
//在第X行Y列开始显示Wdata所对应的单个字符
voidLCD_write_char(ucharX,ucharY,ucharWdata)
{
LCD_SET_XY(X,Y);//写地址
Write_Data(Wdata);//写入当前字符并显示
}
//清屏函数
voidLCD_clear(void)
{
Write_Instruction(0x01);
Delay_xms(5);
}
//显示屏初始化函数
voidLCD_init(void)
{
Write_Instruction(0x38);//8bitinterface,2line,5*7dots
Delay_xms(5);
Write_Instruction(0x38);
Delay_xms(5);
Write_Instruction(0x38);
Write_Instruction(0x08);//关显示,不显光标,光标不闪烁
Write_Instruction(0x01);//清屏
Delay_xms(5);
Write_Instruction(0x04);//写一字符,整屏显示不移动
//Write_Instruction(0x05);//写一字符,整屏右移
//Write_Instruction(0x06);//写一字符,整屏显示不移动
//Write_Instruction(0x07);//写一字符,整屏左移
Delay_xms(5);
//Write_Instruction(0x0B);//关闭显示(不显示字符,只有背光亮)
Write_Instruction(0x0C);//开显示,光标、闪烁都关闭
//Write_Instruction(0x0D);//开显示,不显示光标,但光标闪烁
//Write_Instruction(0x0E);//开显示,显示光标,但光标不闪烁
//Write_Instruction(0x0F);//开显示,光标、闪烁均显示
}
//DS1302初始化函数
voidds1302_init(void)
{
RST=0;//RST脚置低
SCK=0;//SCK脚置低
}
//向DS1302写入一字节数据
voidds1302_write_byte(ucharaddr,uchard)
{
uchari;
RST=1;//启动DS1302总线
//写入目标地址:
addr
addr=addr&0xFE;//最低位置零,寄存器0位为0时写,为1时读
for(i=0;i<8;i++){
if(addr&0x01){
IO=1;
}
else{
IO=0;
}
SCK=1;//产生时钟
SCK=0;
addr=addr>>1;
}
//写入数据:
d
for(i=0;i<8;i++){
if(d&0x01){
IO=1;
}
else{
IO=0;
}
SCK=1;//产生时钟
SCK=0;
d=d>>1;
}
RST=0;//停止DS1302总线
}
//从DS1302读出一字节数据
uchards1302_read_byte(ucharaddr){
uchari,temp;
RST=1;//启动DS1302总线
//写入目标地址:
addr
addr=addr|0x01;//最低位置高,寄存器0位为0时写,为1时读
for(i=0;i<8;i++){
if(addr&0x01){
IO=1;
}
else{
IO=0;
}
SCK=1;
SCK=0;
addr=addr>>1;
}
//输出数据:
temp
for(i=0;i<8;i++){
temp=temp>>1;
if(IO){
temp|=0x80;
}
else{
temp&=0x7F;
}
SCK=1;
SCK=0;
}
RST=0;//停止DS1302总线
returntemp;
}
//向DS302写入时钟数据
voidds1302_write_time(void)
{
ds1302_write_byte(ds1302_control_add,0x00);//关闭写保护
ds1302_write_byte(ds1302_sec_add,0x80);//暂停时钟
//ds1302_write_byte(ds1302_charger_add,0xa9);//涓流充电
ds1302_write_byte(ds1302_year_add,time_buf[1]);//年
ds1302_write_byte(ds1302_month_add,time_buf[2]);//月
ds1302_write_byte(ds1302_date_add,time_buf[3]);//日
ds1302_write_byte(ds1302_hr_add,time_buf[4]);//时
ds1302_write_byte(ds1302_min_add,time_buf[5]);//分
ds1302_write_byte(ds1302_sec_add,time_buf[6]);//秒
ds1302_write_byte(ds1302_day_add,time_buf[7]);//周
ds1302_write_byte(ds1302_control_add,0x80);//打开写保护
}
//从DS302读出时钟数据
voidds1302_read_time(void)
{
time_buf[1]=ds1302_read_byte(ds1302_year_add);//年
time_buf[2]=ds1302_read_byte(ds1302_month_add);//月
time_buf[3]=ds1302_read_byte(ds1302_date_add);//日
time_buf[4]=ds1302_read_byte(ds1302_hr_add);//时
time_buf[5]=ds1302_read_byte(ds1302_min_add);//分
time_buf[6]=(ds1302_read_byte(ds1302_sec_add))&0x7f;//秒,屏蔽秒的第7位,避免超出59
time_buf[7]=ds1302_read_byte(ds1302_day_add);//周
}
voidDisplay(void)
{
LCD_write_char(3,0,dis_time_buf[0]+'0');
LCD_write_char(4,0,dis_time_buf[1]+'0');
LCD_write_char(5,0,dis_time_buf[2]+'0');
LCD_write_char(6,0,dis_time_buf[3]+'0');
LCD_write_char(7,0,'/');
LCD_write_char(8,0,dis_time_buf[4]+'0');
LCD_write_char(9,0,dis_time_buf[5]+'0');
LCD_write_char(10,0,'/');
LCD_write_char(11,0,dis_time_buf[6]+'0');
LCD_write_char(12,0,dis_time_buf[7]+'0');
LCD_write_char(15,0,dis_time_buf[14]+'0');
//第2行显示
LCD_write_char(3,1,dis_time_buf[8]+'0');
LCD_write_char(4,1,dis_time_buf[9]+'0');
LCD_write_char(5,1,':
');
LCD_write_char(6,1,dis_time_buf[10]+'0');
LCD_write_char(7,1,dis_time_buf[11]+'0');
LCD_write_char(8,1,':
');
LCD_write_char(9,1,dis_time_buf[12]+'0');
LCD_write_char(10,1,dis_time_buf[13]+'0');
}
//定时器中断函数
voidTimer2()interrupt5//定时器2是5号中断
{
staticuchart;
TF2=0;
t++;
if(t==4)//间隔200ms(50ms*4)读取一次时间
{
t=0;
ds1302_read_time();//读取时间
dis_time_buf[0]=(time_buf[0]>>4);//年
dis_time_buf[1]=(time_buf[0]&0x0f);
dis_time_buf[2]=(time_buf[1]>>4);
dis_time_buf[3]=(time_buf[1]&0x0f);
dis_time_buf[4]=(time_buf[2]>>4);//月
dis_time_buf[5]=(time_buf[2]&0x0f);
dis_time_buf[6]=(time_buf[3]>>4);//日
dis_time_buf[7]=(time_buf[3]&0x0f);
dis_time_buf[14]=(time_buf[7]&0x07);//星期
//第2行显示
dis_time_buf[8]=(time_buf[4]>>4);//时
dis_time_buf[9]=(time_buf[4]&0x0f);
dis_time_buf[10]=(time_buf[5]>>4);//分
dis_time_buf[11]=(time_buf[5]&0x0f);
dis_time_buf[12]=(time_buf[6]>>4);//秒
dis_time_buf[13]=(time_buf[6]&0x0f);
}
}
//定时器2初始化
voidInit_timer2(void)
{
RCAP2H=0x3c;//赋T2初始值0x3cb0,溢出20次为1秒,每次溢出时间为50ms
RCAP2L=0xb0;
TR2=1;//启动定时器2
ET2=1;//打开定时器2中断
EA=1;//打开总中断
}
//主函数
voidmain(void)
{
Delay_xms(50);//等待系统稳定
LCD_init();//LCD初始化
LCD_clear();//清屏
ds1302_init();//DS1302初始化
Delay_xms(10);
ds1302_write_time();//写入初始值
Init_timer2();//定时器2初始化
while
(1)
{
Display();
}
}