51单片机矩阵按键控制数字并显示在数码管上代码

以下是一个简单的51单片机矩阵按键控制数字并显示在数码管上的代码：

#include <reg51.h>

unsigned char code numCode[] = {  // 数码管显示字符编码
    0x3F, 0x06, 0x5B, 0x4F, 0x66,
    0x6D, 0x7D, 0x07, 0x7F, 0x6F
};

sbit ROW1 = P1^0;  // 矩阵按键行引脚
sbit ROW2 = P1^1;
sbit ROW3 = P1^2;
sbit ROW4 = P1^3;
sbit COL1 = P1^4;  // 矩阵按键列引脚
sbit COL2 = P1^5;
sbit COL3 = P1^6;
sbit COL4 = P1^7;

void delay(unsigned int t) {  // 延时函数
    unsigned int i, j;
    for(i = 0; i < t; i++)
        for(j = 0; j < 125; j++);
}

unsigned char getKey() {  // 获取按下的按键值
    unsigned char key = 0;
    ROW1 = 0; ROW2 = ROW3 = ROW4 = 1;
    if(COL1 == 0) { delay(5); if(COL1 == 0) key = 1; }
    if(COL2 == 0) { delay(5); if(COL2 == 0) key = 2; }
    if(COL3 == 0) { delay(5); if(COL3 == 0) key = 3; }
    if(COL4 == 0) { delay(5); if(COL4 == 0) key = 10; }
    ROW1 = ROW2 = 0; ROW3 = ROW4 = 1;
    if(COL1 == 0) { delay(5); if(COL1 == 0) key = 4; }
    if(COL2 == 0) { delay(5); if(COL2 == 0) key = 5; }
    if(COL3 == 0) { delay(5); if(COL3 == 0) key = 6; }
    if(COL4 == 0) { delay(5); if(COL4 == 0) key = 11; }
    ROW1 = ROW3 = 0; ROW2 = ROW4 = 1;
    if(COL1 == 0) { delay(5); if(COL1 == 0) key = 7; }
    if(COL2 == 0) { delay(5); if(COL2 == 0) key = 8; }
    if(COL3 == 0) { delay(5); if(COL3 == 0) key = 9; }
    if(COL4 == 0) { delay(5); if(COL4 == 0) key = 12; }
    ROW1 = ROW2 = ROW3 = 0; ROW4 = 1;
    if(COL1 == 0) { delay(5); if(COL1 == 0) key = 15; }
    if(COL2 == 0) { delay(5); if(COL2 == 0) key = 0; }
    if(COL3 == 0) { delay(5); if(COL3 == 0) key = 14; }
    if(COL4 == 0) { delay(5); if(COL4 == 0) key = 13; }
    return key;
}

void main() {
    unsigned char key = 0, num = 0;
    while(1) {
        key = getKey();
        if(key != 0) {
            if(key < 10) num = key;  // 数字键
            else if(key == 12) num = 10;  // A键
            else if(key == 9) num = 11;  // B键
            else if(key == 13) num = 12;  // C键
            else if(key == 14) num = 13;  // D键
            else if(key == 15) num = 14;  // *键
            else if(key == 11) num = 15;  // #键
            P0 = numCode[num];  // 数码管显示数字
        }
    }
}

这个代码使用了一个4x4的矩阵按键来输入数字，然后将数字转换成对应的数码管字符编码进行显示。其中，getKey()函数用来获取按下的按键值，numCode[]数组用来存储数码管字符编码，delay()函数用来进行延时。在主函数中，读取按键值后将其转换成对应的数字，然后将数字的字符编码输出到数码管中进行显示。