juzhen.zip_4*4点阵程序

/**********************************************************/ /*电路见仿真图，P3接按键，其中高4位接列线，低4位接行线 /*利用矩阵键盘扫描检测原理得到键值 /**********************************************************/ #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; //仿真时消隐 P0 = seven_seg[x % 10]; P2 = 0xfe; delay(1000); P0 = 0xff; //仿真时消隐 P0 = seven_seg[x / 10]; P2 = 0xfd; delay(1000); } void main(void) { uchar i = 0,j; while(1) { P1 = key_scan[i]; //行线扫描，行线依次为低电平 i++; if(i >= 4)i = 0; if(P1 != key_scan[i]) //如果有按键按下 { delay(200); //消除键盘抖动 for(j = 0;j <= 16;j++) { if(P1 == key_value[j])//扫描键值 k = j; } } display(k); //显示键值对应数字 } }