51单片机简易计算器设计

#include<reg51.h> #define uint unsigned int #define uchar unsigned char sbit lcden=P1^1; //LCD1602控制引脚，使能引脚 sbit rs=P1^0; sbit rw=P1^2; sbit busy=P0^7;// LCD忙 uchar mode=0; //记录清零键状态 char i, j, temp, num, num_1; long a, b, c; // a：第一个操作数，b：第二个操作数，c：得数 float a_c, b_c; uchar flag, signal;// flag:运算符号// signal: 1:+ 2:- 3:* 4:/ uchar code num_table[]={ 7,8,9,0, 4,5,6,0, 1,2,3,0, 0,0,0,0 }; uchar code display_table[]={ 0x37,0x38,0x39,0x2f, //7,8,9,/ 0x34,0x35,0x36,0x2a, //4,5,6,* 0x31,0x32,0x33,0x2d, //1,2,3,- 0x01,0x00,0x3d,0x2b //C,0,=,+ }; void delay(unsigned int z) {// 延时函数 unsigned char i, j; while(z--){ i = 2;j = 239; do{ while(--j); }while(--i); } } void write_com(uchar com){//命令 rs=0;P0=com; delay(5);lcden=1; delay(5);lcden=0; } void write_date(uchar date) { // 数据 rs=1; P0=date; delay(5);lcden=1; delay(5);lcden=0; } void init() {//初始化 num=-1;lcden=1; rw=0; write_com(0x38); delay(5); write_com(0x38); delay(5); write_com(0x0c); delay(1); write_com(0x06); delay(1); write_com(0x80);delay(1); write_com(0x01); num_1=0;i=0;j=0; a=0;b=0;c=0;flag=0;signal=0; } void keyscan() {//键盘扫描 P2 = 0xef; // 高四位代表行，第四位代表列，检测低电平//1110 1111 - 第一行 if(P2 != 0xef) {// 判断按键 delay(20); if(P2 != 0xef) { // 再次判断 temp = P2 & 0x0f; // 屏蔽高四位，只考虑第四位确定是哪一列// 1110 1111 & 0000 1111 = 0000 1111 switch(temp){ // 判断第四位哪一位为0，对应列按下 case 0x0e: num = 0; break;// 0000 1110 -- 7 case 0x0d: num = 1; break;// 0000 1101 -- 8 case 0x0b: num = 2; break;// 0000 1011 -- 9 case 0x07: num = 3; break;// 0000 0111 -- ÷ } } while(P2 != 0xef); // 继续判断 if(num == 0 || num == 1 || num == 2){ //'7','8','9' if(j != 0){ write_com(0x01); j = 0; // 清屏 } if(flag == 0) // 检测是否按过+-×÷按键 a = a * 10 + num_table[num];// 没有按过，第一个操作数 else b = b * 10 + num_table[num];// 按过，第二个操作数 } else{ flag = 1;signal = 4; // 不是7,8,9，是÷ } i = display_table[num];write_date(i); } P2 = 0xdf; if(P2 != 0xdf){ delay(20); if(P2 != 0xdf){ temp = P2 & 0x0f; switch(temp){ case 0x0e: num = 4; break; //4 case 0x0d: num = 5; break; //5 case 0x0b: num = 6; break; //6 case 0x07: num = 7; break; //* } } while(P2 != 0xdf); if(num == 4 || num == 5 || num == 6){ //'4','5','6' if(j != 0){ write_com(0x01); j = 0; } if(flag == 0) a = a * 10 + num_table[num]; else b = b * 10 + num_table[num]; } else{ flag = 1;signal = 3;//× } i = display_table[num]; write_date(i); } P2 = 0xbf; if(P2 != 0xbf){ delay(20); if(P2 != 0xbf){ temp = P2 & 0x0f; switch(temp){ case 0x0e: num=8; break; //1 case 0x0d: num=9; break; //2 case 0x0b: num=10;break; //3 case 0x07: num=11;break; //- } } while(P2 != 0xbf); if(num == 8 || num == 9 || num == 10){ //'1','2','3' if(j != 0){ write_com(0x01); j = 0; } if(flag == 0) a = a * 10 + num_table[num]; else b = b * 10 + num_table[num]; } else{ flag=1;signal=2; } i = display_table[num]; write_date(i); } P2 = 0x7f; if(P2 != 0x7f){ delay(20); if(P2 != 0x7f){ temp = P2 & 0x0f; switch(temp){ case 0x0e:num=12; break; //AC case 0x0d:num=13; break; //0 case 0x0b:num=14; break; //= case 0x07:num=15; break; //+ } } while(P2 != 0x7f); switch(num){ case 12:{// ?? if(mode == 0){ write_com(0x0f); a = 0;b = 0;flag = 0;signal = 0; mode++; } if(mode != 0){ write_com(0x01); a = 0;b = 0;flag = 0;signal = 0; mode++;write_com(0x0f); } }break; case 13: { // 0 if(flag==0){ a = a*10; write_date(0x30); P2 = 0; } else if(flag >= 1){ b = b * 10; write_date(0x30); } } break; case 14:{// = j = 1; write_com(0x0c); if(signal == 1) { write_com(0x80+0x4f);write_com(0x04); c = a + b; while(c!=0){ write_date(0x30+c%10); c=c/10; } write_date(0x3d); a=0;b=0;flag=0;signal=0; } else if(signal==2) { write_com(0x80+0x4f);write_com(0x04); if(a-b>0) c=a-b; else c=b-a; while(c!=0) { write_date(0x30+c%10);c=c/10; } if(a-b<0) write_date(0x2d); if(a==b) write_date(0x30+0); write_date(0x3d); a=0;b=0;flag=0;signal=0; } else if(signal==3) { write_com(0x80+0x4f); write_com(0x04); c=a*b; while(c!=0) { write_date(0x30+c%10);c=c/10; } write_date(0x3d); a=0;b=0;flag=0;signal=0; } else if(signal==4) { write_com(0x80+0x4f);write_com(0x04); i=0; if(b!=0){ c=(long)(((float)a/b)*1000); while(c!=0){ write_date(0x30+c%10); c=c/10;i++; if(i==3) write_date(0x2e); } if(a/b<=0){ if(i<=2){ if(i==1) write_date(0x30); write_date(0x2e);write_date(0x30); } write_date(0x30); } write_date(0x3d); a=0;b=0;flag=0;signal=0; } else { write_date('!');write_date('R'); write_date('O');write_date('R'); write_date('R');write_date('E'); } } }break; case 15:{ write_date(display_table[num]);flag=1;signal=1; } break; } } } void main() { init(); while(1){ keyscan(); } }