简易计算器编程.doc

#include#include#include#defineuintunsignedint#defineucharunsignedchar#defineBUSP2unsignedcharcodestr1=ENTER1TOSTART;voidkeyscan();voidkeyscan_0(); sbitE=P13; sbitRS=P14; sbitRW=P10;chari,j,temp,num,num_0,num_1;longa,b,c;ucharflag,fuhao;ucharcodetable=1,2,3,0x2f-0x30, 4,5,6,0x2a-0x30, 7,8,9,0x2d-0x30, 0x01-0x30,0,0x3d-0x30,0x2b-0x30;voiddelay(ucharm)/延时子函数uchary;for (m;m0;m-)for (y=0;y110;y+);unsignedcharTest_busy(void)/检测遇忙函数 unsignedcharBusy; BUS=0xff; RS=0; RW=1; E=1; _nop_(); Busy=BUS&0x80;E=0; returnBusy;voidwrite_cmd(unsignedcharcommand)/写命令函数 while(Test_busy(); RW=0; RS=0; E=0; BUS=command; E=1; _nop_(); E=0;voidwrite_dat(unsignedchardat)/写数据函数 while(Test_busy(); RW=0; RS=1; E=0; BUS=dat; E=1; _nop_(); E=0;voidLcd_init(void)/LCD液晶复位函数write_cmd(0x38);write_cmd(0x01);write_cmd(0x06);write_cmd(0x0c);write_cmd(0x80);num_1=0;i=0;j=0;a=0;b=0;c=0;flag=0;fuhao=0;voidkeyscan_0( ) P3=0xf7; if(P3!=0xf7) temp=P3&0xf0; switch(temp) case0xe0:num_0=0;write_cmd(0x01); break; voidkeyscan()/键盘扫描程序操作 P3=0xf7; if(P3!=0xf7) delay(20); /延迟20ms if(P3!=0xf7) temp=P3&0xf0; switch(temp)case0xe0:num=0;break;case0xd0:num=1;break;case0xb0:num=2;break;case0x70:num=3;break; while(P3!=0xf7);if(num=0|num=1|num=2)/如果按下的是1,2或3if(j!=0) write_cmd(0x01);j=0;if(flag=0)/没有按过符号键a=a*10+tablenum;Else/如果按过符号键b=b*10+tablenum;Else/如果按下的是/flag=1;fuhao=4;/4表示除号已按i=tablenum;write_dat(0x30+i);P3=0xfb;if(P3!=0xfb)delay(5);if(P3!=0xfb)temp=P3&0xf0;switch(temp)case0xe0:num=4;break;case0xd0:num=5;break;case0xb0:num=6;break;case0x70:num=7;break; while(P3!=0xfb);if(num=4|num=5|num=6&num!=7)/如果按下的是4,5或6if(j!=0) write_cmd(0x01);j=0;if(flag=0)/没有按过符号键a=a*10+tablenum;else/如果按过符号键b=b*10+tablenum;else/如果按下的是/flag=1;fuhao=3;/3表示乘号已按i=tablenum;write_dat(0x30+i);P3=0xfd;if(P3!=0xfd)delay(5);if(P3!=0xfd)temp=P3&0xf0;switch(temp)case0xe0:num=8;break;case0xd0:num=9;break;case0xb0:num=10;break;case0x70:num=11;break;while(P3!=0xfd);if(num=8|num=9|num=10)/如果按下的是7,8或9if(j!=0)write_cmd(0x01);j=0;if(flag=0)/没有按过符号键a=a*10+tablenum;else/如果按过符号键b=b*10+tablenum;elseif(num=11)/如果按下的是-flag=1;fuhao=2;/2表示减号已按i=tablenum;write_dat(0x30+i);P3=0xfe;if(P3!=0xfe)delay(5);if(P3!=0xfe)temp=P3&0xf0;switch(temp)case0xe0:num=12;break;case0xd0:num=13;break;case0xb0:num=14;break;case0x70:num=15;break;while(P3!=0xfe);switch(num)case12:write_cmd(0x80+0x4f);write_cmd(0x04);i=0;c=(long)(float)sqrt(a)*1000);while(c!=0)write_dat(0x30+c%10); c=c/10;i+;if(i=3)write_dat(0x2e);if(sqrt(a)0)c=a-b;elsec=b-a;while(c!=0)write_dat(0x30+c%10); c=c/10;if(a-b0)write_dat(0x2d);write_dat(0x3d);/再写=a=0;b=0;flag=0;fuhao=0;elseif(fuhao=3)write_cmd(0x80+0x4f);write_cmd(0x04);c=a*b;while(c!=0)write_dat(0x30+c%10);c=c/10;write_dat(0x3d);a=0;b=0;flag=0;fuhao=0;elseif(fuhao=4)write_cmd(0x80+0x4f);write_cmd(0x04);i=0;c=(long)(float)a/b)*1000);while(c!=0)writ