4x4的矩阵键盘鬼键51单片机示例

以下是一个基于鬼键51单片机的4x4矩阵键盘示例代码：

#include <reg51.h>

#define uchar unsigned char
#define uint unsigned int

sbit ROW1 = P1^0;
sbit ROW2 = P1^1;
sbit ROW3 = P1^2;
sbit ROW4 = P1^3;
sbit COL1 = P1^4;
sbit COL2 = P1^5;
sbit COL3 = P1^6;
sbit COL4 = P1^7;

uchar KeyValue;

void KeyScan();

void main()
{
    while (1)
    {
        KeyScan();
        if (KeyValue != 0)
        {
            // 处理按键事件
        }
    }
}

// 扫描键盘，获取按下的键值
void KeyScan()
{
    uchar i;

    ROW1 = 0; ROW2 = 1; ROW3 = 1; ROW4 = 1;
    if (COL1 == 0) { KeyValue = 1; return; }
    if (COL2 == 0) { KeyValue = 2; return; }
    if (COL3 == 0) { KeyValue = 3; return; }
    if (COL4 == 0) { KeyValue = 4; return; }

    ROW1 = 1; ROW2 = 0; ROW3 = 1; ROW4 = 1;
    if (COL1 == 0) { KeyValue = 5; return; }
    if (COL2 == 0) { KeyValue = 6; return; }
    if (COL3 == 0) { KeyValue = 7; return; }
    if (COL4 == 0) { KeyValue = 8; return; }

    ROW1 = 1; ROW2 = 1; ROW3 = 0; ROW4 = 1;
    if (COL1 == 0) { KeyValue = 9; return; }
    if (COL2 == 0) { KeyValue = 10; return; }
    if (COL3 == 0) { KeyValue = 11; return; }
    if (COL4 == 0) { KeyValue = 12; return; }

    ROW1 = 1; ROW2 = 1; ROW3 = 1; ROW4 = 0;
    if (COL1 == 0) { KeyValue = 13; return; }
    if (COL2 == 0) { KeyValue = 14; return; }
    if (COL3 == 0) { KeyValue = 15; return; }
    if (COL4 == 0) { KeyValue = 16; return; }

    KeyValue = 0;
}

该代码中使用了4个行引脚和4个列引脚来扫描4x4矩阵键盘。在循环中不断扫描按键，如果有按键按下，则将其键值存储在 `KeyValue` 变量中。可以根据需要在代码中处理按键事件。