- //目的：显示一个固定的数字
- //有几个问题没搞明白，详见scan程序注释
- # include <reg52.h>
- typedef unsigned char uchar;
- typedef unsigned int uint;
- sbit addr0 = P1^0;
- sbit addr1 = P1^1;
- sbit addr2 = P1^2;
- sbit addr3 = P1^3;
- sbit enled = P1^4;
- uchar a, b, c = 0;
- uchar number[16] = { 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
- 0x80,0x90,0x88,0x83,0xa7,0xa1,0x86,0x8e
- };
- void scan (void);
- void main (void)
- {
- addr3 = 1;
- while (1)
- {
- scan();
- }
- }
- void scan (void)
- {
- //uchar a,b,c; 为什么不能定义为局部变量
- uchar i = 158;//要显示的数字
- enled = 1;// 这句和上边那句（uchar i = 158）位置为什么不能调啊
- a = i/100;
- addr0 = 1;
- addr1 = 0;
- addr2 = 1;
- P0 = number[a]; //显示第一位
- enled = 0;
- enled = 1;
- b = i%100/10;
- addr0 = 0;
- addr1 = 0;
- addr2 = 1;
- P0 = number[b]; //显示第二位
- enled = 0;
- enled = 1;
- c = i%100%10;
- addr0 = 1;
- addr1 = 1;
- addr2 = 0;
- P0 = number[c]; //显示第三位
- enled = 0;
- }
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