键盘解析程序.doc

/*本程序是4x3键盘解析程序，通过P1口采集输入信息，* 通过数码管进行显示 *与wan-chen51单片机配套*作者：谢sire */#includechar table=0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f;sbit AddrEn = P20;sbit DataEn = P22;char key,value;void keyscan(void);void deal(void);void display(void);void delay(int time) while(time-);main(void) while(1) keyscan(); deal(); display(); void keyscan(void) /键盘扫描函数，使用行列逐级扫描法 unsigned char val; int i; P1=0xf0;/高四位置高，低四位拉低 if(P1!=0xf0)/表示有按键按下 for(i=0;i100;i+); /去抖 if(P1!=0xf0) P1=0xfe; /检测第一行 if(P1!=0xfe) for(i=0;i100;i+); /去抖if(P1!=0xfe) val = P1&0xf0; key = val+0; P1=0xfd; /检测第二行 if(P1!=0xfd) for(i=0;i100;i+); /去抖if(P1!=0xfd) val = P1&0xf0; key = val+3; P1=0xfb; /检测第三行 if(P1!=0xfb) for(i=0;i100;i+); /去抖 if(P1!=0xfe) val = P1&0xf0; key = val+6; P1=0xf7; /检测第四行 if(P1!=0xf7) for(i=0;i100;i+); /去抖 if(P1!=0xfe) val = P1&0xf0; key = val+9; void deal(void) switch(key) case 0xe0 : value = 1;break; case 0xd0 : value = 2;break; case 0xb0 : value = 3;break; case 0xe3 : value = 4;break; case 0xd3 : value = 5;break; case 0xb3 : value = 6;break; case 0xe6 : value = 7;break; case 0xd6 : value = 8;break; case 0xb6 : value = 9;break; case 0xe9 : value = 10;break; case 0xd9 : value = 11;break; case 0xb9 : value = 12;break; void display(void) P0 = 1; AddrEn = 1; AddrEn = 0; P0 = tablevalue%10; DataEn = 1; DataEn = 0; delay(500); P0 = 2; AddrEn =