51单片机控制LCD1602显示4x4键盘按键值(Proteus仿真+Keil源码)

#include <reg52.h> #include <string.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int void Initialize_LCD(); void ShowString(uchar,uchar,uchar *); uchar code init[][80]= { "Current Number:", }; uchar code line[][80]= { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F" }; uchar code KeyCodeTable[]= { 0x11,0x12,0x14,0x18,0x21,0x22,0x24,0x28,0x41,0x42,0x44,0x48,0x81,0x82,0x84,0x88 }; void Delay() { uchar i; for(i=0;i<200;i++); } uchar Keys_Scan() { uchar sCode,kCode,i,k; P1 = 0xf0; if((P1&0xf0)!=0xf0) { Delay(); if((P1&0xf0)!=0xf0) { sCode = 0xfe; for(k=0;k<4;k++) { P1 = sCode; if((P1&0xf0)!=0xf0) { kCode = ~P1; for(i=0;i<16;i++) { if(kCode == KeyCodeTable[i]) return i; } } else sCode = _crol_(sCode,1); } } } return -1; } void main() { uint Count = 0; uchar KeyNO = -1; IE = 0x81; IT0 = 1; F0 = 0; Initialize_LCD(); ShowString(0,0,init[0]); while(1) { KeyNO = Keys_Scan(); if(KeyNO != -1) { ShowString(0,1,line[KeyNO]); } } }