- /接线方式:P0.0~P0.7 接BIT0~BIT7 P1.0~P1.7接a~h P2.0~P2^7 接KL ~ KH
- //4*4矩阵键盘
- #include<reg51.h>
- sbit we =P0^1;
- char led_mod[] = {0x3f,0x06,0X5b,0x4f,0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,0x58,0x5e,0x79,0x71
- };
- char key_buf[] = {0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,
- 0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77
- };
- char getchar(void)
- {
- char key_scan[] = {0xfe,0xfd,0xfb,0xf7};
- char i = 0,j = 0;
- for(i =0;i < 4;i++)
- {
- P2 = key_scan[i];
- if((P2 & 0xf0)!=0xf0)
- {
- for(j =0 ;j < 16;j++)
- {
- if(key_buf[j] == P2)
- return j;
- }
-
- }
- }
- return -1;
- }
- void main()
- {
- char key=0;
- we = 0;
- P1 = 0X00;
- while(1)
- {
- key =getchar();
- if(key != -1)
- P1 = led_mod[key];
- }
- }
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