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#include <reg52.h> #define uchar unsigned char #define uint unsigned int sbit rs=P2^2; sbit rw=P2^1; sbit e=P2^0; void write_dat(uchar dat); void write_com(uchar com); void process(void); void keyscan(); /*按鍵功能*/ uchar code table1[]= { 1,2,3,0x2b-0x30, // 1, 2, 3, + 4,5,6,0x2d-0x30, // 4, 5, 6, - 7,8,9,0x2a-0x30, // 7, 8, 9, x 0,0x3d-0x30,0x01-0x30,0x2f-0x30 // 0, =, 清零, / }; uchar k=0,flag=0,num,fuhao[6],i,temp1=0,flag1=0; long a,b,c,d; void delay(uint z) { uint x,y; for(x=z;x>0;x--) for(y=110;y>0;y--); } /********按鍵處理***********/ void keyscan() { uchar temp; P3=0xfe; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xee:num=0; break; case 0xde:num=1; break; case 0xbe:num=2; break; case 0x7e:num=3; break; } while(temp!=0xf0) // 松手檢測 { temp=P3; temp=temp&0xf0; } } if(num==0||num==1||num==2) { if(flag==0) a=a*10+table1[num]; //如果沒有按符號鍵,符號前的數(shù)值為a else if(flag==1) b=b*10+table1[num]; //如果按了符號鍵,符號后的數(shù)值為b else if(temp1>=2&&flag1==1) { flag=1; flag1=0; process(); a=c; b=table1[num]; } if(k==1) { k=0; write_com(0x01); } } else if(num==3) { flag++; flag1=1; temp1++; fuhao[temp1-1]=1; } i=table1[num]; //顯示按下的鍵 write_dat(0x30+i); } P3=0xfd; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xed:num=4; break; case 0xdd:num=5; break; case 0xbd:num=6; break; case 0x7d:num=7; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } if(num==4||num==5||num==6) { if(k==1) { k=0; write_com(0x01); } if(flag==0) a=a*10+table1[num]; else if(flag==1) b=b*10+table1[num]; else if(temp1>=2&&flag1==1) { flag=1; flag1=0; process(); a=c; b=table1[num]; } } else if(num==7) { flag++; temp1++; flag1=1; fuhao[temp1-1]=2; } i=table1[num]; write_dat(0x30+i); } P3=0xfb; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xeb:num=8; break; case 0xdb:num=9; break; case 0xbb:num=10; break; case 0x7b:num=11; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } if(num==8||num==9||num==10) { if(k==1) { k=0; write_com(0x01); } if(flag==0) a=a*10+table1[num]; else if(flag==1) b=b*10+table1[num]; else if(temp1>=2&&flag1==1) { flag=1; flag1=0; process(); a=c; b=table1[num]; } } else if(num==11) { flag++; temp1++; flag1=1; fuhao[temp1-1]=3; } i=table1[num]; write_dat(0x30+i); } P3=0xf7; temp=P3; temp=temp&0xf0; while(temp!=0xf0) { delay(5); temp=P3; temp=temp&0xf0; while(temp!=0xf0) { temp=P3; switch(temp) { case 0xe7:num=12; // 0鍵 break; case 0xd7:num=13; // '=' break; case 0xb7:num=14; //清零鍵 break; case 0x77:num=15; //除號鍵 break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } } switch(num) { case 12: { if(k==1) { k=0; write_com(0x01); } if(flag==0) a=a*10; else if(flag==1) b=b*10; else if(temp1>=2&&flag1==1) { flag=1; flag1=0; process(); a=c; b=table1[num]; } write_dat(0x30); } break; case 13: { k=1; if(temp1>=2) fuhao[0]=fuhao[temp1-1]; if(fuhao[0]==1) { write_com(0x80+0x4f); write_com(0x04); c=a+b; d=c; while(c!=0) { write_dat(0x30+c%10); c=c/10; } write_dat(0x3d); fuhao[0]=0;fuhao[1]=0;fuhao[2]=0; fuhao[3]=0;fuhao[4]=0;fuhao[5]=0; a=0;b=0;flag=0;flag1=0;temp1=0; } if(fuhao[0]==2) { write_com(0x80+0x4f); write_com(0x04); if(a>=b) { c=a-b; d=c; while(c!=0) { write_dat(0x30+c%10); c=c/10; } } else if(a<b) { c=b-a; d=c; while(c!=0) { write_dat(0x30+c%10); c=c/10; } write_dat(0x2d); } write_dat(0x3d); fuhao[0]=0;fuhao[1]=0;fuhao[2]=0; fuhao[3]=0;fuhao[4]=0;fuhao[5]=0; a=0;b=0;flag=0;flag1=0;temp1=0; } if(fuhao[0]==3) { write_com(0x80+0x4f); write_com(0x04); c=a*b; d=c; while(c!=0) { write_dat(0x30+c%10); c=c/10; } write_dat(0x3d); fuhao[0]=0;fuhao[1]=0;fuhao[2]=0; fuhao[3]=0;fuhao[4]=0;fuhao[5]=0; a=0;b=0;flag=0;flag1=0;temp1=0; } if(fuhao[0]==4) { i=0; write_com(0x80+0x4f); write_com(0x04); c=(long)(((float)a/b)*1000000); d=c; while(c!=0) { write_dat(0x30+c%10); c=c/10; i++; if(i==6) write_dat(0x2e); } if(a/b<=0) write_dat(0x30); write_dat(0x3d); fuhao[0]=0;fuhao[1]=0;fuhao[2]=0; fuhao[3]=0;fuhao[4]=0;fuhao[5]=0; a=0;b=0;flag=0;flag1=0;temp1=0; } } break; case 14: { write_com(0x01); a=0;b=0;flag=0;temp1=0;flag1=0; fuhao[0]=0;fuhao[1]=0;fuhao[2]=0; fuhao[3]=0;fuhao[4]=0;fuhao[5]=0; } break; case 15: { flag++; temp1++; flag1=1; fuhao[temp1-1]=4; write_dat(0x30+table1[num]); } break; } } } /*******led1602顯示*******/ void write_com(uchar com) { rs=0; rw=0; P0=com; e=1; delay(5); e=0; } void write_dat(uchar dat) { rs=1; rw=0; P0=dat; e=1; delay(5); e=0; } void process(void) { if(fuhao[temp1-2]==1) //如果符號鍵是+，執(zhí)行加法運算 { c=a+b; b=0; } // 如果符號鍵是-，執(zhí)行減法運算 if(fuhao[temp1-2]==2) { c=a-b; b=0; } if(fuhao[temp1-2]==3) //如果符號鍵是*執(zhí)行乘法運算 { c=a*b; b=0; } if(fuhao[temp1-2]==4) //如果符號鍵是/ 執(zhí)行除法運算 { c=(long)((float)a/b); b=0; } } /*液晶的初始化*/ void init() //初始化 { delay(15); write_com(0x38); delay(6); write_com(0x38); delay(6); write_com(0x38); write_com(0x38); write_com(0x0c); //開顯示，關光標 write_com(0x06); //光標移動 write_com(0x01); //清屏 } void main() { init(); while(1) { keyscan(); 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