一个ch455实现4x5矩阵键盘灯光具体代码

以下是一个基于CH455芯片的4x5矩阵键盘灯光的简单代码示例：

#include <reg52.h>
#include <intrins.h>

// 定义列为输入，行为输出
sbit C1 = P1^0;
sbit C2 = P1^1;
sbit C3 = P1^2;
sbit C4 = P1^3;

sbit R1 = P1^4;
sbit R2 = P1^5;
sbit R3 = P1^6;
sbit R4 = P1^7;

// 状态存储
unsigned char key_state[4][5] = {
    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF}
};

// 按键对应的灯光状态
unsigned char led_state[4][5] = {
    {0xFE, 0xFD, 0xFB, 0xF7, 0xEF},
    {0xFE, 0xFD, 0xFB, 0xF7, 0xEF},
    {0xFE, 0xFD, 0xFB, 0xF7, 0xEF},
    {0xFE, 0xFD, 0xFB, 0xF7, 0xEF}
};

// 延时函数
void delay(unsigned int n)
{
    while(n--);
}

// 获取键盘状态
void get_key_state()
{
    int i, j;
    unsigned char temp;

    // 遍历每一列
    for(i = 0; i < 4; i++) {
        // 设置对应列为低电平，其余列为高电平
        switch(i) {
            case 0: C1 = 0; C2 = 1; C3 = 1; C4 = 1; break;
            case 1: C1 = 1; C2 = 0; C3 = 1; C4 = 1; break;
            case 2: C1 = 1; C2 = 1; C3 = 0; C4 = 1; break;
            case 3: C1 = 1; C2 = 1; C3 = 1; C4 = 0; break;
        }

        // 延时一段时间，等待稳定
        delay(100);

        // 读取该列的行状态
        temp = P0;

        // 遍历每一行
        for(j = 0; j < 5; j++) {
            // 如果该行为低电平，则说明有按键按下
            if((temp & (1 << j)) == 0) {
                // 更新按键状态
                key_state[i][j] = 0;
            } else {
                key_state[i][j] = 1;
            }
        }
    }
}

// 更新灯光状态
void update_led_state()
{
    int i, j;

    // 遍历每一行
    for(i = 0; i < 4; i++) {
        // 遍历每一列
        for(j = 0; j < 5; j++) {
            // 如果该按键状态为按下，则更新对应的灯光状态
            if(key_state[i][j] == 0) {
                led_state[i][j] &= ~(1 << i);
            } else {
                led_state[i][j] |= (1 << i);
            }
        }
    }
}

// 更新灯光状态，并输出到LED灯
void output_led_state()
{
    int i, j;

    // 遍历每一列
    for(i = 0; i < 4; i++) {
        // 设置对应列为高电平，其余列为低电平
        switch(i) {
            case 0: C1 = 1; C2 = 0; C3 = 0; C4 = 0; break;
            case 1: C1 = 0; C2 = 1; C3 = 0; C4 = 0; break;
            case 2: C1 = 0; C2 = 0; C3 = 1; C4 = 0; break;
            case 3: C1 = 0; C2 = 0; C3 = 0; C4 = 1; break;
        }

        // 输出对应行的灯光状态
        P0 = led_state[i][0];
        R1 = 0;
        delay(10);
        R1 = 1;

        P0 = led_state[i][1];
        R2 = 0;
        delay(10);
        R2 = 1;

        P0 = led_state[i][2];
        R3 = 0;
        delay(10);
        R3 = 1;

        P0 = led_state[i][3];
        R4 = 0;
        delay(10);
        R4 = 1;

        P0 = led_state[i][4];
        R5 = 0;
        delay(10);
        R5 = 1;
    }
}

// 主函数
void main()
{
    while(1) {
        // 获取键盘状态
        get_key_state();

        // 更新灯光状态
        update_led_state();

        // 输出灯光状态
        output_led_state();
    }
}

注意：此代码仅为示例，实际使用时需要根据自己的硬件电路进行修改。