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#include <reg52.h>#include <intrins.h>#include <stdio.h>#include <stdlib.h>#include <string.h> typedef enum{ STATE0 = 0, STATE1, STATE2, STATE3,STATE4, }STATE;STATE current_state = STATE0;#define uint unsigned int#define uchar unsigned char#define DataPort P0 #define RS_CLR RS=0 #define RS_SET RS=1#define RW_CLR RW=0 #define RW_SET RW=1 #define EN_CLR EN=0#define EN_SET EN=1sbit RS = P2^4; //?¨??????,?è?? sbit RW = P2^5;sbit EN = P2^6;uchar key=20,ch;uchar table[]={'1','2','3','4','5','6','7','8','9','0'};void delayms(uint);void LCD_show();void test();void delayms(uint xms){ uint i,j; for(i=xms;i>0;i--) for(j=110;j>0;j--);}// 1602????/*------------------------------------------------ ?????ü??????M------------------------------------------------*/ void LCD_Write_Com(unsigned char com) { delayms(5); RS_CLR; RW_CLR; EN_SET; DataPort= com; _nop_(); EN_CLR; } /*------------------------------------------------ ????????????------------------------------------------------*/void LCD_Write_Data(unsigned char Data) { //while(LCD_Check_Busy()); //???ò???? delayms(5); RS_SET; RW_CLR; EN_SET; DataPort= Data; _nop_(); EN_CLR; } /*------------------------------------------------ ????????------------------------------------------------*/ void LCD_Clear(void) { LCD_Write_Com(0x01); delayms(5); } /*------------------------------------------------ ????×?·??®????------------------------------------------------*/ void LCD_Write_String(uchar x,uchar y,uchar *s) { IF (y == 0) { LCD_Write_Com(0x80 + x); } else { LCD_Write_Com(0xC0 + x); } while (*s) { LCD_Write_Data( *s); s ++; } }/*------------------------------------------------ ????×?·?????------------------------------------------------*/ void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) { if (y == 0) { LCD_Write_Com(0x80 + x); } else { LCD_Write_Com(0xC0 + x); } LCD_Write_Data( Data); } /*------------------------------------------------ ??????????------------------------------------------------*/ void LCD_Init(void) { LCD_Write_Com(0x38); /*?????????è??*/ delayms(5); LCD_Write_Com(0x38); delayms(5); LCD_Write_Com(0x38); delayms(5); LCD_Write_Com(0x38); LCD_Write_Com(0x08); /*??????±?*/ LCD_Write_Com(0x01); /*????????*/ LCD_Write_Com(0x06); /*??????±ê?????è??*/ delayms(5); LCD_Write_Com(0x0C); /*???????°??±ê?è??*/}//???ó?ü?? void matrixkeyscan(){uchar temp;P3=0xfe;temp=P3;temp=temp&0xf0;if(temp!=0xf0){ delayms(10); temp=P3; temp=temp&0xf0; if(temp!=0xf0) { temp=P3; switch(temp) { case 0xee: key=11; break; case 0xde: key=3; break; case 0xbe: key=2; break; case 0x7e: key=1; break;}while(temp!=0xf0){ temp=P3; temp=temp&0xf0;}}}P3=0xfd;temp=P3;temp=temp&0xf0;if(temp!=0xf0){ delayms(10); temp=P3; temp=temp&0xf0; if(temp!=0xf0) { temp=P3; switch(temp) { case 0xed: key=12; break; case 0xdd: key=6; break; case 0xbd: key=5; break; case 0x7d: key=4; break;}while(temp!=0xf0){ temp=P3; temp=temp&0xf0;}}}P3=0xfb;temp=P3;temp=temp&0xf0;if(temp!=0xf0){ delayms(10); temp=P3; temp=temp&0xf0; if(temp!=0xf0) { temp=P3; switch(temp) { case 0xeb: key=13; break; case 0xdb: key=9; break; case 0xbb: key=8; break; case 0x7b: key=7; break;}while(temp!=0xf0){ temp=P3; temp=temp&0xf0;}}}P3=0xf7;temp=P3;temp=temp&0xf0;if(temp!=0xf0){ delayms(10); temp=P3; temp=temp&0xf0; if(temp!=0xf0) { temp=P3; switch(temp) { case 0xe7: key=16; break; case 0xd7: key=12; break; case 0xb7: key=11; break; case 0x77: key=10; break;}while(temp!=0xf0){ temp=P3; temp=temp&0xf0;}}}}uchar datadeal(){ if(key<=10) return table[key-1]; else return 0xff;}void main(){uchar k,i;LCD_Init();LCD_Write_Com(0x0F);LCD_Write_String(1,0,\"Input the code\");delayms(2000);while(1){ for(i=0;i<4;) { matrixkeyscan();while((ch!=datadeal())&&(datadeal()!=0xff)) {ch=datadeal();LCD_Write_Char(0+k,1,ch);//????????????×?·?k++; switch(current_state){ case STATE0: if(ch == '2') current_state = STATE1; break;case STATE1: if(ch == '4') current_state = STATE2; break; case STATE2: if(ch == '7') current_state = STATE3; break; case STATE3: if(ch == '9') current_state = STATE4; break; default: current_state = STATE0; break; }i++;}}k=0; if(current_state == STATE4){ LCD_Clear(); delayms(10);LCD_Write_Com(0x0c); LCD_Write_String(4,0,\"Correct\"); LCD_Write_String(2,1,\"Lock is open\"); current_state = STATE0;while(1); }else { LCD_Clear(); LCD_Write_String(4,0,\"Wrong\"); LCD_Write_String(1,1,\"Lock is closed\"); current_state = STATE0; } break; }delayms(2000);}这是我第一次用状态机的概念来编程，程序比较小，功能也比较简单，就是用矩阵键盘输入数字，1602液晶显示，不过与一般密码锁有所不同，我用状态机来比较输入的数字与正确数字，感觉比较简单，但是，还有很多不足：输入的数字无法显示最后一位，但是状态机可以判断（这个暂时未解决，希望大家给些建议）；本来想把是1602显示的部分和状态机部分分别做成函数，但是那样运行不成功，就这样写了，程序看起来不太清晰，望提宝贵意见
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