前不久看完了矩阵键盘和数码管的应用，自己动手花了一天时间写了一个简单的计算器
。
下面贴上源代码，大家可以测试一下。
上面4*4的矩阵键盘，作用分别是：
1 2 3 +
4 5 6 —
7 8 9 *
on/c 0 = /
其中矩阵键盘的部分基本是照着书本的代码改的，然后自己做了部分修改。
由于是直接用 int 变量做的计算，而如果用 long 变量的话又要用到大数的运算，所以只能计算小于65536的数。
计算的步骤是这样的：
（主操作数）（操作符）（被操作数）（=）
//main.c
#include<reg52.h>
#include"involve.h"
uint num = 0; //主操作数
uint temp_num = 0; //被操作的数
uint show = 0; //用于显示的数
uint mode = 0; //当前计算器处于的操作状态（操纵符）
//‘+‘是1，‘-‘是2，‘*‘是3，‘/‘是4，‘=‘是5，之前无操纵状态则是0.
void main()
{
while(1) //不停地扫描键盘和展示当前状态
{
keyscan();
display(show);
}
}
1 //keyscan.c
2 #include"involve.h"
3 extern num;
4 extern temp_num;
5 extern show;
6 extern mode;
7 void keyscan() //键盘扫描程序
8 {
9 uchar temp;
10 int key;
11 P3 = 0xfe;
12 temp = P3;
13 temp = temp&0xf0;
14 if(temp!=0xf0)
15 {
16 delay(10);
17 temp = P3;
18 temp = temp&0xf0;
19 if(temp!=0xf0)
20 {
21 temp = P3;
22 switch(temp)
23 {
24 case 0xee:
25 key = 1;
26 break;
27 case 0xde:
28 key = 2;
29 break;
30 case 0xbe:
31 key = 3;
32 break;
33 case 0x7e:
34 key = 10;
35 if(mode==5) {temp_num = 0; } //如果之前是等号，被操作数重新置为0
36 mode = 1;
37 break;
38 }
39
40 while(temp!=0xf0)
41 {
42 temp = P3;
43 temp = temp&0xf0;
44
45 }
46
47 if(key>=0&&key<=9) //无操纵状态则将操作数输入，有操纵状态则将被操纵数输入。
48 if(mode==0)
49 {
50 num = num*10 + key;show = num;
51 }
52 else
53 {
54 temp_num = temp_num*10 + key;show = temp_num;
55 }
56
57 }
58 }
59
60 P3 = 0xfd;
61 temp = P3;
62 temp = temp&0xf0;
63 if(temp!=0xf0)
64 {
65 delay(10);
66 temp = P3;
67 temp = temp&0xf0;
68 if(temp!=0xf0)
69 {
70 temp = P3;
71 switch(temp)
72 {
73 case 0xed:
74 key = 4;
75 break;
76 case 0xdd:
77 key = 5;
78 break;
79 case 0xbd:
80 key = 6;
81 break;
82 case 0x7d:
83 key = 11;
84 if(mode==5) {temp_num = 0; }
85 mode = 2;
86 break;
87 }
88
89 while(temp!=0xf0)
90 {
91 temp = P3;
92 temp = temp&0xf0;
93
94 }
95 if(key>=0&&key<=9)
96 if(mode==0)
97 {
98 num = num*10 + key;show = num;
99 }
100 else
101 {
102 temp_num = temp_num*10 + key;show = temp_num;
103 }
104 }
105 }
106
107 P3 = 0xfb;
108 temp = P3;
109 temp = temp&0xf0;
110 if(temp!=0xf0)
111 {
112 delay(10);
113 temp = P3;
114 temp = temp&0xf0;
115 if(temp!=0xf0)
116 {
117 temp = P3;
118 switch(temp)
119 {
120 case 0xeb:
121 key = 7;
122 break;
123 case 0xdb:
124 key = 8;
125 break;
126 case 0xbb:
127 key = 9;
128 break;
129 case 0x7b:
130 key = 12;
131 if(mode==5) {temp_num = 0; }
132 mode = 3;
133 break;
134 }
135
136 while(temp!=0xf0)
137 {
138 temp = P3;
139 temp = temp&0xf0;
140
141 }
142 if(key>=0&&key<=9)
143 if(mode==0)
144 {
145 num = num*10 + key;show = num;
146 }
147 else
148 {
149 temp_num = temp_num*10 + key; show = temp_num;
150 }
151 }
152 }
153
154 P3 = 0xf7;
155 temp = P3;
156 temp = temp&0xf0;
157 if(temp!=0xf0)
158 {
159 delay(10);
160 temp = P3;
161 temp = temp&0xf0;
162 if(temp!=0xf0)
163 {
164 temp = P3;
165 switch(temp)
166 {
167 case 0xe7:
168 key = 15;initial(); //如果按下on/c键，所有数据都被置为0.
169 break;
170 case 0xd7:
171 key = 0;
172 break;
173 case 0xb7:
174 key = 14;calculate(mode); //按下‘=‘号，开始计算。
175 mode = 5;
176 break;
177 case 0x77:
178 key = 13;
179 if(mode==5) {temp_num = 0; }
180 mode = 4;
181 break;
182 }
183
184 while(temp!=0xf0)
185 {
186 temp = P3;
187 temp = temp&0xf0;
188
189 }
190 if(key>=0&&key<=9)
191 if(mode==0)
192 {
193 num = num*10 + key;show = num;
194 }
195 else
196 {
197 temp_num = temp_num*10 + key;show = temp_num;
198 }
199 }
200 }
201 }
//function.c//各种函数的定义都在这儿。
#include"involve.h"
extern num;
extern temp_num;
extern show;
extern mode;
void delay(uint xms)
{
uint i,j;
for(i=0;i<xms;i++)
for(j=0;j<110;j++);
}
void initial()
{
num = 0;
temp_num = 0;
mode = 0;
show = 0;
}
void calculate(int x)
{
switch(x)
{
case 1:
show = num + temp_num;break;
case 2:
show = num - temp_num;break;
case 3:
show = num * temp_num; break;
case 4:
if(temp_num==0)
show = 1000000; //之前以为long变量也可以进行四则运算，就想用一个7位数（数码管是6位），来表示被除数是 0 的错误状态。现在开来多次一举了
else
show = num / temp_num;
}
display(show);
num = show;
}
//involve.h//各种申明。 1 #include<reg52.h> 2 #define uint unsigned int 3 #define uchar unsigned char 4 5 sbit dula = P2^6; 6 sbit wela = P2^7; 7 8 void delay(uint); 9 void keyscan(); 10 void display(unsigned long); 11 void calculate(int); 12 void initial();
//display.c//数码管显示程序。 1 #include<reg52.h>
2 #include"involve.h"
3 uchar code table[]={
4 0x3f,0x06,0x5b,0x4f,
5 0x66,0x6d,0x7d,0x07,
6 0x7f,0x6f,0x77,0x7c,
7 0x39,0x5e,0x79,0x71
8 };
9 void display(unsigned long int x)
10 {
11 uint temp;
12 int ge,shi,bai,qian,wan,shiwan;
13 if(x==1000000) //之前以为long变量也可以进行四则运算，就想用一个7位数（数码管是6位），来表示被除数是 0 的错误状态。现在开来多次一举了。
14 {
15
16 }
17 else
18 {
19 ge = x%10;
20 shi = x%100/10;
21 bai = x%1000/100;
22 qian = x%10000/1000;
23 wan = x%100000/10000;
24 shiwan = x%1000000/100000;
25
26 P0 = table[ge];
27 dula = 1;
28 dula = 0;
29 P0 = 0xff;
30 wela = 1;
31 P0 = 0xdf;
32 wela = 0;
33 //delay(5);
34
35 temp = x/10;
36 P0 = table[shi];
37 dula = 1;
38 dula = 0;
39 P0 = 0xff;
40 wela = 1;
41 if(temp) P0 = 0xef;
42 wela = 0;
43 //delay(5);
44
45
46 temp = x/100;
47 P0 = table[bai];
48 dula = 1;
49 dula = 0;
50 P0 = 0xff;
51 wela = 1;
52 if(temp) P0 = 0xf7;
53 wela = 0;
54 //delay(5);
55
56 temp = x/1000;
57 P0 = table[qian];
58 dula = 1;
59 dula = 0;
60 P0 = 0xff;
61 wela = 1;
62 if(temp) P0 = 0xfb;
63 wela = 0;
64 //delay(5);
65
66 temp = x/10000;
67 P0 = table[wan];
68 dula = 1;
69 dula = 0;
70 P0 = 0xff;
71 wela = 1;
72 if(temp) P0 = 0xfd;
73 wela = 0;
74 //delay(5);
75
76
77 temp = x/100000;
78 P0 = table[shiwan];
79 dula = 1;
80 dula = 0;
81 P0 = 0xff;
82 wela = 1;
83 if(temp) P0 = 0xfe;
84 wela = 0;
85 //delay(5);
86 }
87 }
好了程序到这就结束了，下载生成hex文件试试效果吧！
时间： 2024-08-07 00:17:56