51单片机数码管矩阵按键显示0-15代码

以下是一个基于51单片机的数码管矩阵按键显示0-15的代码：

#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int

// 数码管显示的数字编码
uchar code numCode[16] = {
    0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 
    0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};

sbit LSA = P2^2;
sbit LSB = P2^3;
sbit LSC = P2^4;
sbit keyIn1 = P3^2;
sbit keyIn2 = P3^3;
sbit keyIn3 = P3^4;
sbit keyIn4 = P3^5;
sbit keyOut1 = P3^6;
sbit keyOut2 = P3^7;

// 数码管位选函数
void selectPos(uchar pos) {
    switch(pos) {
        case 0:
            LSA = 0; LSB = 0; LSC = 0;
            break;
        case 1:
            LSA = 1; LSB = 0; LSC = 0;
            break;
        case 2:
            LSA = 0; LSB = 1; LSC = 0;
            break;
        case 3:
            LSA = 1; LSB = 1; LSC = 0;
            break;
        case 4:
            LSA = 0; LSB = 0; LSC = 1;
            break;
        case 5:
            LSA = 1; LSB = 0; LSC = 1;
            break;
        case 6:
            LSA = 0; LSB = 1; LSC = 1;
            break;
        case 7:
            LSA = 1; LSB = 1; LSC = 1;
            break;
    }
}

// 读取键值函数
uchar getKey() {
    uchar val = 0xff;
    keyOut1 = 0;
    if (keyIn1 == 0) { val = 0; }
    if (keyIn2 == 0) { val = 1; }
    if (keyIn3 == 0) { val = 2; }
    if (keyIn4 == 0) { val = 3; }
    keyOut1 = 1;

    keyOut2 = 0;
    if (keyIn1 == 0) { val = 4; }
    if (keyIn2 == 0) { val = 5; }
    if (keyIn3 == 0) { val = 6; }
    if (keyIn4 == 0) { val = 7; }
    keyOut2 = 1;

    return val;
}

void main() {
    uchar i, j, val;
    while(1) {
        for (i = 0; i < 8; i++) {
            selectPos(i);
            P0 = numCode[i];
            for (j = 0; j < 50; j++); // 延时
            P0 = 0x00;
        }

        val = getKey(); // 读取按键值
        if (val != 0xff) {
            P0 = numCode[val];
            while(getKey() != 0xff); // 等待按键松开
        }
    }
}

这个程序使用了一个8位数码管矩阵和4个按键，每次循环遍历数码管的每一位，并在每一位上显示相应的数字。同时，程序会不断地读取按键值，如果有按键按下，则在数码管上显示相应的数字。需要注意的是，这个程序只能显示0-7这8个数字，如果想要显示更多数字，还需要对`numCode`数组进行扩展。