仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
這是仿真圖
單片機源程序如下:
- #include<reg51.h>
- #define uchar unsigned char
- #define uint unsigned int
- code uchar key_scan[4] = {0xfe,0xfd,0xfb,0xf7};
- code uchar key_value[16] = {0xee,0xde,0xbe,0x7e,
- 0xed,0xdd,0xbd,0x7d,
- 0xeb,0xdb,0xbb,0x7b,
- 0xe7,0xd7,0xb7,0x77,};
- code seven_seg[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
- uchar k = 88;
- void delay(uint x)
- {
- while(x--);
- }
- void display(uchar x)
- {
- P0 = 0xff; //仿真時消隱
- P0 = seven_seg[x % 10];
- P2 = 0xfe;delay(1000);
- P0 = 0xff; //仿真時消隱
- P0 = seven_seg[x / 10];
- P2 = 0xfd;delay(1000);
- }
- void main(void)
- {
- uchar i = 0,j;
- while(1)
- {
- P3 = key_scan[i];
- if(P3 != key_scan[i])
- {
- delay(200);
- for(j = 0;j <= 16;j++)
- {
- if(P3 == key_value[j])
- k = j;
- }
- }
- display(k);
- i++;
- if(i >= 4)
- i = 0;
- }
- }
-單片機的按鍵.zip
(440.67 KB, 下載次數: 10)
2020-12-8 17:21 上傳
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