LCD1602液晶显示与4×4矩阵键盘

1、一、要求：液晶显示器第一行显示HelloWorld!;第二行显示键盘的键值。二、程序代码：#include#include#defineucharunsignedchar#defineuintunsignedintunsignedcharcodedis1尸HelloWorld!;ucharkey_val=0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G;sbitU3_DS=P1A5;sbitU3_STCP=P1A4;sbitU3_SHCP=P1A3;sbitU4_DS=P1A2;sbitU4_STCP=P1A1；sbitU4_SHCP=P1A0;voiddelay(unsig

2、nedintn);/74HC595voidU3_595(unsignedcharnum)unsignedcharcountl;for(count1=0;count1=7;count1+)if(num&0 x80)=0 x80)/最高位为 1,则向 SDATA_595 发送 1U3_DS=1;elseU3_DS=0;U3_SHCP=0;U3_SHCP=1;num=1;/左移U3_STCP=0;U3_STCP=1;voidU4_595(unsignedcharnum)/发送指令到 RS,RW,E(4,5,6 位)unsignedcharcount2;for(count2=0;count2=

3、7;count2+)(if(num&0 x80)=0 x80)(U4_DS=1;else(U4_DS=0;U4_SHCP=0;U4_SHCP=1;num0;n-)for(i=0;i125;i+)_nop_();写指令到 LCDvoidwcmd(unsignedcharcmd)(U4_595(0 x00);U3_595(cmd);U4_595(0 x40);U4_595(0 x00);写要显示的数据到 LCDvoidwdat(unsignedchardat)(U4_595(0 x10);U3_595(dat);U4_595(0 x50);U4_595(0 x10);初始化 LCD 子程序

4、voidinit()(wcmd(0 x38);/设置 8 位总线双行显示，5*7 点阵delay(20);wcmd(0 x0C);/开显示，开光标，不闪烁delay(20);wcmd(0 x06);/读写字符时地址加 1delay(20);wcmd(0 x01);/清屏delay(20);键盘扫描子程序voidkeyscan(void)(unsignedcharn;/扫描第行P0=0 xEF;n=P0;n&=0 x0F;if(n!=0 x0F)(delay(1);/去抖动P0=0 xEF;n=P0;n&=0 x0F;if(n!=0 x0F)(switch(n)(case(0 x

5、0E):wdat(key_val0 x01);break;case(0 x0D):wdat(key_val0 x02);break;case(0 x0B):wdat(key_val0 x03);break;case(0 x07):wdat(key_val0 x04);break;P0=0 xDF;/扫描第二行n=P0;n&=0 x0F;if(n!=0 x0F)(delay(1);P0=0 xDF;n=P0;n&=0 x0F;if(n!=0 x0F)(switch(n)(case(0 x0E):wdat(key_val0 x05);break;case(0 x0D):wdat(k

6、ey_val0 x06);break;case(0 x0B):wdat(key_val0 x07);break;case(0 x07):wdat(key_val0 x08);break;P0=0 xBF;/扫描第三行n=P0;n&=0 x0F;if(n!=0 x0F)(delay(1);P0=0 xBF;n=P0;n&=0 x0F;if(n!=0 x0F)(switch(n)(case(0 x0E):wdat(key_val0 x09);break;case(0 x0D):wdat(key_val0 x0A);break;case(0 x0B):wdat(key_val0 x0

7、B);break;case(0 x07):wdat(key_val0 x0C);break;P0=0 x7F;/扫描第四行n=P0;n&=0 x0F;if(n!=0 x0F)(delay(1);P0=0 x7F;n=P0;n&=0 x0F;if(n!=0 x0F)(switch(n)(case(0 x0E):wdat(key_val0 x0D);break;case(0 x0D):wdat(key_val0 x0E);break;case(0 x0B):wdat(key_val0 x0F);break;case(0 x07):wdat(key_val0 x10);break;voidmain(void)unsignedchari;init();wcmd(0 x82);for(i=0;i12;i+)wdat(dis1i);while(1)delay(15);wcmd(0 x38);/设置 8 位总线