一、要求：液晶显示器第一行显示“Hello World!”；第二行显示键盘的键值二、程序代码：#include #include #define uchar unsigned char #define uint unsigned int unsigned char code dis1[]={“Hello World!“}; uchar key_val[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};sbit U3_DS=P1^5; sbit U3_STCP=P1^4; sbit U3_SHCP=P1^3;sbit U4_DS=P1^2; sbit U4_STCP=P1^1; sbit U4_SHCP=P1^0; void delay(unsigned int n); //74HC595 void U3_595(unsigned char num){unsigned char count1;for (count1=0;count10;n--)for(i=0;i<125;i++)_nop_();} //写指令到 LCD void wcmd(unsigned char cmd) {U4_595(0x00);U3_595(cmd);U4_595(0x40);U4_595(0x00); } //写要显示的数据到 LCD void wdat(unsigned char dat) {U4_595(0x10);U3_595(dat);U4_595(0x50);U4_595(0x10); } //初始化 LCD 子程序 void init(){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 void keyscan(void) { unsigned char n;//扫描第一行P0=0xEF;n=P0;n if(n!=0x0F) {delay(1);//去抖动P0=0xEF;n=P0;nif(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 if(n!=0x0F){delay(1);P0=0xDF;n=P0;nif(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 if(n!=0x0F){delay(1);P0=0xBF;n=P0;nif(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 if(n!=0x0F){delay(1);P0=0x7F;n=P0;nif(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;}}} } void main(void) { unsigned char i; init(); wcmd(0x82); for (i=0;i<12;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(); }}/*--------------------------------------------------------------。