1、本设计采用LCD液晶显示器来显示输出数据。通过D0-D7引脚向LCD写指令字或写数据以使LCD实现不同的功能或显示相应数据。5、软件部分#includeintrins.h#define uchar unsigned charsbit lcden=P27;sbit lcdrs=P26;sbit lcdrw=P25;sbit lcdbf=P07;uchar temp,key,i,j,flag,fh,k;long a,b,c;uchar code table=1,2,3,0, 4,5,6,0, 7,8,9,0, 0,0,0,0;uchar code table2=123+456-789*000/;v
2、oid delay(uchar ms) uchar x,y; for(x=ms;x0;x-) for(y=110;yy-);/*-对LCD1602的操作-*/bit busy(void)/判断忙碌 bit res; lcdrs=0; lcdrw=1; lcden=1; _nop_(); res=lcdbf; lcden=0; return res;void write_inst (uchar cmd)/写命令 while(busy()=1); /忙碌就等待 lcdrw=0; P0=cmd;void write_com(uchar com)/写地址 write_inst(com|0x80);vo
3、id write_date(uchar dat) /写数据 lcdrs=1; P0=dat;void init() /初始化 write_inst(0x38);/显示8位2行 delay(5); write_inst(0x0c);/显示开,光标关,不闪烁 write_inst(0x06);/增量方式不位移 write_inst(0x80);/检测忙碌信号 write_inst(0x01);/*-键盘扫描-*/void keyscan()/键盘扫描 P3=0xfe; if(P3!=0xfe) delay(100); if(P3! temp=P3&0xf0; switch(temp) case 0
4、xe0:key=0;break; case 0xd0:key=1; case 0xb0:key=2; case 0x70:key=3; while(P3!=0xfe); if(key=0|key=1|key=2) if(j!=0) write_inst(0x01); j=0; if(flag=0) a=a*10+tablekey; if(flag=1) b=b*10+tablekey; write_date(table2key); else if(k=0) flag=1; k=1; fh=1; write_date(table2key); P3=0xfd;=0xfd)key=4;key=5;k
5、ey=6;key=7;=0xfd); if(key=4|key=5|key=6) fh=2; P3=0xfb;=0xfb)key=8;key=9;key=10;key=11;=0xfb); if(key=8|key=9|key=10) fh=3; P3=0xf7;=0xf7)key=12;key=13;key=14;key=15;=0xf7); switch(key) case 12:write_inst(0x01);a=0;b=0;flag=0;fh=0;j=0;k=0; break; case 13: if(flag=0) a=a*10; write_date(0x30); P1=0; e
6、lse if(flag=1) b=b*10; write_date(0x30); break; case 14: j=1; if(fh=1) write_com(0x4f); write_inst(0x04); c=a+b; while(c! write_date(0x30+c%10); c=c/10; write_date(0x3d); a=0; else if(fh=2) if(a-b)0) c=a-b; else c=b-a; if(c=0) write_date(0x30+0); if(a-b)*(-1) write_date(0x2d); else if(fh=3) c=a*b; e
7、lse if(fh=4) write_com(0x4f); write_inst(0x04); i=0; c=(long)(float)a/b)*1000); /计算c的数据 if(c=0) while(c!=0) write_date(0x30+c%10); c=c/10; i+; if(i=3) write_date(0x2e); /写数据 if(a/b) write_date(0x30); write_date(0x3d); a=0; case 15: if(k=0) write_date(table2key); flag=1; k=1; fh=4; break;void main() init(); i=0; j=0; a=0; b=0; c=0; k=0; flag=0; fh=0; while(1) keyscan(); 6、 总结通过该计算器的设计我深入学习数码管扫描和键盘控制,提高对了51系列单片机的实际应用能力。同时也掌握应用程序控制51系列单片机进行简单的数学运算。提高了对51系列单片机的编程能力。
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