LCD字符型液晶显示器控制

1、LCD字符型液晶显示器控制实现功能:在实验平台上扩展一块LCD点阵字符型液晶显示器，要求：设计接口电路并编程使液晶显示器显示“当前时间”；并用按键输入与或修改时间。工作原理及设计思路：点阵字符型液晶显示器是专门用于显示数字、字母图形符号及少量自定义字符的显示器。在zks-03实验仪上有一标准的LCD液晶显示器接口J4，标注为DS1602。它与P87C52X2单片机以总线方式连接，其硬件连接如图1所示。图1由此可以看出LCD的命令寄存器的地址为：0xf800而数据寄存器的地址是：0xf801。实验箱上的J4接口如图4所示：J4 J5DS1602(SIP16) LCD_L从左到右对应的管脚分别为：

2、1：GND2：VCC3：V0接05V电压，调节LCD的对比度（实验箱上让它接地，使对比度达到最大）4：RS寄存器选择：“0”选指令寄存器；“1”选数据寄存器5：R/W“1”读操作；“0”写操作6：EN使能信号714：DB0DB7八位双向数据信号线1516：LCD背光电源将液晶显示器与J4接口对应连接好，编写读写程序，便对液晶显示器进行控制。电路仿真程序#include<reg52.h>#define uint unsigned int#define uchar unsigned charuchar a,miao,shi,fen,ri,yue,nian,week,flag,temp,

3、key1n;#define yh 0x80 /第一行的初始位置#define er 0x80+0x40 /第二行初始位置/sbit cs1=P37;/sbit ledk=P25;sbit dula=P26;sbit wela=P27;sbit wr=P11;sbit rs=P10;sbit en=P25;sbit SCLK=P21; / 6 P1.1sbit IO=P20; / 7 P1.0sbit RST=P24; /时钟 5 P1.2sbit ACC0=ACC0;sbit ACC7=ACC7;sbit key=P37;sbit key1=P30;sbit key2=P31;sbit key

4、3=P32;uchar code tab1="2009- - THU"uchar code tab2=" : : "void delay(uint xms)/延时函数uint x,y;for(x=xms;x>0;x-) for(y=110;y>0;y-);/*液晶写入*/write_1602com(uchar com)/液晶写入指令函数rs=0;/置为写入命令P0=com;/送入数据delay(1);en=1;/拉高使能端delay(1);en=0;/完成高脉冲write_1602dat(uchar dat)rs=1;/置为写入数据P0=da

5、t;/送入数据delay(1);en=1;delay(1);en=0;/*over*/*ds1302*/void write_byte(uchar dat)ACC=dat;RST=1;for(a=8;a>0;a-)IO=ACC0;SCLK=0;SCLK=1;ACC=ACC>>1;uchar read_byte()RST=1;for(a=8;a>0;a-)ACC7=IO;SCLK=1;SCLK=0;ACC=ACC>>1;return (ACC);void write_1302(uchar add,uchar dat)RST=0;SCLK=0;RST=1;wri

6、te_byte(add);write_byte(dat);SCLK=1;RST=0;uchar read_1302(uchar add)uchar temp;RST=0;SCLK=0;RST=1;write_byte(add);temp=read_byte();SCLK=1;RST=0;return(temp);uchar BCD_Decimal(uchar bcd) uchar Decimal; Decimal=bcd>>4; return(Decimal=Decimal*10+(bcd&=0x0F);void ds1302_init()RST=0;SCLK=0;writ

7、e_1302(0x80,miao|0x00);/允许写void write_sfm(uchar add,uchar dat)/写时分秒uchar gw,sw;gw=dat%10;sw=dat/10;write_1602com(er+add);write_1602dat(0x30+sw);write_1602dat(0x30+gw);void write_nyr(uchar add,uchar dat)uchar gw,sw;gw=dat%10;sw=dat/10;write_1602com(yh+add);write_1602dat(0x30+sw);write_1602dat(0x30+gw

8、);void write_week(uchar week)/写星期函数write_1602com(yh+0x0d);switch(week)case 1:write_1602dat('M');/delay(5); write_1602dat('O');/delay(5); write_1602dat('N'); break; case 2:write_1602dat('T');/delay(5); write_1602dat('U');/delay(5); write_1602dat('E'); b

9、reak;case 3:write_1602dat('W');/delay(5); write_1602dat('E');/delay(5); write_1602dat('D'); break;case 4:write_1602dat('T');/delay(5); write_1602dat('H');/delay(5); write_1602dat('U'); break;case 5:write_1602dat('F');/delay(5); write_1602dat(&#

10、39;R');/delay(5); write_1602dat('I'); break;case 6:write_1602dat('S');/delay(5); write_1602dat('T');/delay(5); write_1602dat('A'); break;case 7:write_1602dat('S');/delay(5); write_1602dat('U');/delay(5); write_1602dat('N'); break;lcd_init()

11、/液晶初始化函数 wr=0;write_1602com(0x38);/设置液晶工作模式write_1602com(0x0c);/开显示不显示光标write_1602com(0x06);/整屏不移动，指针加一write_1602com(0x01);write_1602com(yh+2);/字符写入的位置for(a=0;a<14;a+)write_1602dat(tab1a);/delay(3);write_1602com(er+4);for(a=0;a<8;a+)write_1602dat(tab2a);/delay(3);void keyscan() key=0;if(key1=0

12、)/key1为功能键delay(5);if(key1=0)while(!key1);key1n+;if(key1n=9)key1n=1;switch(key1n)case 1: TR0=0;/关闭定时器/TR1=0;write_1602com(er+0x0b);/写入光标位置 write_1602com(0x0f);/设置光标为闪烁 temp=(miao)/10*16+(miao)%10; write_1302(0x8e,0x00); write_1302(0x80,0x80|temp);/miao write_1302(0x8e,0x80); break;case 2: write_1602

13、com(er+8);/fen /write_1602com(0x0f);break;case 3: write_1602com(er+5);/shi /write_1602com(0x0f);break;case 4: write_1602com(yh+0x0f);/week /write_1602com(0x0f);break;case 5: write_1602com(yh+0x0b);/ri /write_1602com(0x0f);break;case 6: write_1602com(yh+0x08);/yue /write_1602com(0x0f);break;case 7: w

14、rite_1602com(yh+0x05);/nian /write_1602com(0x0f);break;case 8:write_1602com(0x0c);/设置光标不闪烁TR0=1;/打开定时器temp=(miao)/10*16+(miao)%10; write_1302(0x8e,0x00); write_1302(0x80,0x00|temp);/miao write_1302(0x8e,0x80); break;if(key1n!=0)/当key1按下以下。再按以下键才有效if(key2=0) /上调键delay(5);if(key2=0)while(!key2);switch

15、(key1n)case 1:miao+;if(miao=60)miao=0;write_sfm(0x0a,miao);/写入新的秒数temp=(miao)/10*16+(miao)%10; write_1302(0x8e,0x00); write_1302(0x80,0x80|temp); write_1302(0x8e,0x80);write_1602com(er+0x0b);/因为设置液晶的模式是写入数据后，指针自动加一，在这里是写回原来的位置/write_1602com(0x0b);break;case 2:fen+;if(fen=60)fen=0;write_sfm(0x07,fen)

16、;temp=(fen)/10*16+(fen)%10; write_1302(0x8e,0x00); write_1302(0x82,temp); write_1302(0x8e,0x80);write_1602com(er+8);break;case 3:shi+;if(shi=24)shi=0;write_sfm(4,shi);temp=(shi)/10*16+(shi)%10; write_1302(0x8e,0x00); write_1302(0x84,temp); write_1302(0x8e,0x80);write_1602com(er+5);break;case 4:week+

17、;if(week=8)week=0;write_week(week);write_1602com(yh+0x0f);break;case 5:ri+;if(ri=31)ri=0;write_nyr(10,ri);temp=(ri)/10*16+(ri)%10; write_1302(0x8e,0x00); write_1302(0x86,temp); write_1302(0x8e,0x80);write_1602com(yh+11);break;case 6:yue+;if(yue=13)yue=0;write_nyr(7,yue);temp=(yue)/10*16+(yue)%10; wr

18、ite_1302(0x8e,0x00); write_1302(0x88,temp); write_1302(0x8e,0x80);write_1602com(yh+8);break;case 7:nian+; if(nian=100)nian=0;write_nyr(4,nian);write_1602com(yh+5);break;if(key3=0)delay(5);if(key3=0)while(!key3);switch(key1n)case 1:miao-;if(miao=-1)miao=59;write_sfm(0x0a,miao);/写入新的秒数write_1602com(er

19、+0x0b);/因为设置液晶的模式是写入数据后，指针自动加一，在这里是写回原来的位置/write_1602com(0x0b);break;case 2:fen-;if(fen=-1)fen=59;write_sfm(7,fen);temp=(fen)/10*16+(fen)%10; write_1302(0x8e,0x00); write_1302(0x82,temp); write_1302(0x8e,0x80);write_1602com(er+8);break;case 3:shi-; if(shi=-1)shi=23;write_sfm(4,shi);temp=(shi)/10*16+

20、(shi)%10; write_1302(0x8e,0x00); write_1302(0x84,temp); write_1302(0x8e,0x80);write_1602com(er+5);break;case 4:week-;if(week=-1)week=7;write_week(week);write_1602com(yh+0x0f);break;case 5:ri-;if(ri=-1)ri=30;write_nyr(10,ri);temp=(ri)/10*16+(ri)%10; write_1302(0x8e,0x00); write_1302(0x86,temp); write

21、_1302(0x8e,0x80);write_1602com(yh+11);break;case 6:yue-;if(yue=-1)yue=12;write_nyr(7,yue);temp=(yue)/10*16+(yue)%10; write_1302(0x8e,0x00); write_1302(0x88,temp); write_1302(0x8e,0x80);write_1602com(yh+8);break;case 7:nian-; if(nian=-1)nian=99;write_nyr(4,nian);write_1602com(yh+5);break;void init()TMOD=0x11;TH0=0;TL0=0;EA=