1、刘杰51简单计算器项目:用51单片机做一个简单的计算器小程序 一、硬件仿真图 硬件部分比较简单,当键盘按键按下时它的那一行、那一列的端口为低电平。因此,只要扫描行、列端口是否都为低电平就可以确定是哪个键被按下。二、主程序流程图程序的主要思想是:将按键抽象为字符,然后就是对字符的处理。将操作数分别转化为字符串存储,操作符存储为字符形式。然后调用compute()函数进行计算并返回结果。具体程序及看注释还有流程图。三、程序源代码#include #include #include /* isdigit()函数 */#include /* atoi()函数 */#define uchar unsig
2、ned char#define uint unsigned intuchar operand19, operand29; /* 操作数 */uchar operator; /* 操作符 */void delay(uint);uchar keyscan();void disp(void);void buf(uint value);uint compute(uint va1,uint va2,uchar optor);uchar code table = 0xc0,0xf9,0xa4,0xb0,0x99, 0x92,0x82,0xf8,0x80,0x90,0xff; /* 字符码表 */uchar
3、 dbuf8 = 10,10,10,10,10,10,10,10; /* 显示缓存 */* 延时函数 */ void delay(uint z)uint x,y;for(x=z;x0;x-) for(y=110;y0;y-);/* 键盘扫描程序 将按键转化为字符并作为输出 $,#分别表示清零键和没有键按下 */uchar keyscan() uchar skey; /* 按键值标记变量 */ /* 扫描键盘第1行 */ P1 = 0xfe; while(P1 & 0xf0) != 0xf0) /* 有按键按下 */ delay(3); /* 去抖动延时 */ while(P1 & 0xf0)
4、!= 0xf0) /* 仍有键按下 */ switch(P1) /* 识别按键并赋值 */ case 0xee: skey = 7; break; case 0xde: skey = 8; break; case 0xbe: skey = 9; break; case 0x7e: skey = /; break; default: skey = #; while(P1 & 0xf0) != 0xf0) /* 等待按键松开 */ ; /* 扫描键盘第2行 */ P1 = 0xfd; while(P1 & 0xf0) != 0xf0) delay(3); while(P1 & 0xf0) != 0
5、xf0) switch(P1) case 0xed: skey = 4; break; case 0xdd: skey = 5; break; case 0xbd: skey = 6; break; case 0x7d: skey = *; break; default: skey = #; while(P1 & 0xf0) != 0xf0) ; /* 扫描键盘第3行 */ P1 = 0xfb; while(P1 & 0xf0) != 0xf0) delay(3); while(P1 & 0xf0) != 0xf0) switch(P1) case 0xeb: skey = 1; break;
6、 case 0xdb: skey = 2; break; case 0xbb: skey = 3; break; case 0x7b: skey = -; break; default: skey = #; while(P1 & 0xf0) != 0xf0) ; /* 扫描键盘第4行 */ P1 = 0xf7; while(P1 & 0xf0) != 0xf0) delay(3); while(P1 & 0xf0) != 0xf0) switch(P1) case 0xe7: skey = $; break; case 0xd7: skey = 0; break; case 0xb7: ske
7、y = =; break; case 0x77: skey = +; break; default: skey = #; while(P1 & 0xf0) != 0xf0) ; return skey;void main() uint value1, value2, value; /* 数值1,数值2,结果 */ uchar ckey, cut1 = 0, cut2 = 0; /* ckey键盘输入字符 */ uchar operator; /* 运算符 */ uchar i, bool = 0;init: /* goto语句定位标签 */ buf(0); /* 初始化 */ disp(); value = 0; cut1 = cut2 = 0; bool = 0; for(i = 0;i 0; i-) dbufi = val % 10; val /= 10; for( ; i 0; i-) dbufi = 10;/* 显示函数 */void disp(void) uchar bsel, n; bsel=0x01; for(n=0;n8;n+) P2=bsel; P0=tabledbufn; bsel=_crol_(bsel,1); delay(3); P0=0xff;
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