LCD1602液晶显示与4×4矩阵键盘

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：#includereg52.h#includeintrins.h#defineucharunsignedchar#defineuintunsignedintunsignedcharcodedis1[]={HelloWorld!};ucharkey_val[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};sbitU3_DS=P1^5;sbitU3_STCP=P1^4;sbitU3_SHCP=P1^3;sbitU4_DS=P1^2;sbitU4_STCP=P1^1;sbitU4_SHCP=P1^0;voiddelay(unsignedintn);//74HC595voidU3_595(unsignedcharnum){unsignedcharcount1;for(count1=0;count1=7;count1++){if((num&0x80)==0x80)//最高位为1，则向SDATA_595发送1{U3_DS=1;}else{U3_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=7;count2++){if((num&0x80)==0x80){U4_DS=1;}else{U4_DS=0;}U4_SHCP=0;U4_SHCP=1;num=1;}U4_STCP=0;U4_STCP=1;}//LCD延时子程序n=1时延时1msvoiddelay(unsignedintn){unsignedinti;for(;n0;n--)for(i=0;i125;i++)_nop_();}//写指令到LCDvoidwcmd(unsignedcharcmd){U4_595(0x00);U3_595(cmd);U4_595(0x40);U4_595(0x00);}//写要显示的数据到LCDvoidwdat(unsignedchardat){U4_595(0x10);U3_595(dat);U4_595(0x50);U4_595(0x10);}//初始化LCD子程序voidinit(){wcmd(0x38);//设置8位总线双行显示，5*7点阵delay(20);wcmd(0x0C);//开显示，开光标，不闪烁delay(20);wcmd(0x06);//读写字符时地址加1delay(20);wcmd(0x01);//清屏delay(20);}//键盘扫描子程序voidkeyscan(void){unsignedcharn;//扫描第一行P0=0xEF;n=P0;n&=0x0F;if(n!=0x0F){delay(1);//去抖动P0=0xEF;n=P0;n&=0x0F;if(n!=0x0F){switch(n){case(0x0E):wdat(key_val[0x01]);break;case(0x0D):wdat(key_val[0x02]);break;case(0x0B):wdat(key_val[0x03]);break;case(0x07):wdat(key_val[0x04]);break;}}}P0=0xDF;//扫描第二行n=P0;n&=0x0F;if(n!=0x0F){delay(1);P0=0xDF;n=P0;n&=0x0F;if(n!=0x0F){switch(n){case(0x0E):wdat(key_val[0x05]);break;case(0x0D):wdat(key_val[0x06]);break;case(0x0B):wdat(key_val[0x07]);break;case(0x07):wdat(key_val[0x08]);break;}}}P0=0xBF;//扫描第三行n=P0;n&=0x0F;if(n!=0x0F){delay(1);P0=0xBF;n=P0;n&=0x0F;if(n!=0x0F){switch(n){case(0x0E):wdat(key_val[0x09]);break;case(0x0D):wdat(key_val[0x0A]);break;case(0x0B):wdat(key_val[0x0B]);break;case(0x07):wdat(key_val[0x0C]);break;}}}P0=0x7F;//扫描第四行n=P0;n&=0x0F;if(n!=0x0F){delay(1);P0=0x7F;n=P0;n&=0x0F;if(n!=0x0F){switch(n){case(0x0E):wdat(key_val[0x0D]);break;case(0x0D):wdat(key_val[0x0E]);break;case(0x0B):wdat(key_val[0x0F]);break;case(0x07):wdat(key_val[0x10]);break;}}}}voidmain(void){unsignedchari;init();wcmd(0x82);for(i=0;i12;i++){wdat(dis1[i]);}while(1){delay(15);wcmd(0x38);//设置8位总线双行显示，5*7点阵delay(20);wcmd(0x0C);//开显示，开光标，不闪烁delay(20);wcmd(0x06);//读写字符时地址加1delay(20);wcmd(0xC2);keyscan();}}/*--------------------------------------------------------------*/