蓝桥杯单片机按键进阶

——基于柳离风老师模板及按键进阶教程

1、按键测试-按下生效

key.c

#include "key.h"


/**
 * @brief 独立按键扫描函数
 * 
 * @return uchar 键值对应的元件位号
 */
uchar key_scan1(void)
{
    uchar key = 0;                      //按键值
    static bit key_up = 1;              //按键松开标志，1松开0按下
    if((key_up == 1) && (P30 == 0 || P31 == 0 || P32 == 0 || P33 == 0))
    {
        key_up = 0;
        if(P30 == 0)          key = 7;
        else if(P31 == 0)     key = 6;
        else if(P32 == 0)     key = 5;
        else if(P33 == 0)     key = 4;
        return key;
    }
    else if(P30 == 1 && P31 == 1 && P32 == 1 && P33 == 1)
        key_up = 1;
    return 0;
}


/**
 * @brief 矩阵键盘扫描函数
 * 
 * @return uchar 键值对应的元件位号
 */
uchar key_scan2(void)
{
    uchar key = 0;                      //按键值
    static bit key_up = 1;              //按键松开标志，1松开0按下
    P44 = P42 = 1;                      //列扫描
    P32 = P33 = 0;
    if((key_up == 1)&&(P44 == 0 || P42 == 0))
    {
        
        if(P44 == 0)        key = 7;
        else if(P42 == 0)   key = 11;
        else                return 0;
        key_up = 0;                     //标志按下
        P44 = P42 = 0;
        P32 = P33 = 1;                  //行扫描
        if(P32 == 0)   key = key - 2;
        else if(P33 == 0)   key = key - 3;
        return key;
    }
    else if(P44 == 1 && P42 == 1)
        key_up = 1;                     //松开
    return 0;
}

main.c

//按键处理任务
void key_task(void)
{
    uchar key_num;
    if(key_dly<10)return;
    key_dly = 0;
//    key_num = key_scan1();
    key_num = key_scan2();
    switch (key_num)
    {
        /* 独立按键 */
//        case 4:  num++;
//            break;
//        case 5:  num--;
//            break;
//        case 6:  flag_L1 ^= 1;
//            break;
//        case 7:  state_display = (state_display+1)%2;
//            break;
        
        /* 矩阵键盘 */
        case 4:  num++;
            break;
        case 5:  num--;
            break;
        case 8:  flag_L1 ^= 1;
            break;
        case 9:  state_display = (state_display+1)%2;
            break;
    }
}

2、按键进阶-松手生效

key.c

#include "key.h"


/**
 * @brief 独立按键扫描函数
 * 
 * @return uchar 键值对应的元件位号
 */
uchar key_scan1(void)
{
    uchar key = 0;                      //按键值
    static bit key_up = 1;              //按键松开标志，1松开0按下
    static bit flag_s4 = 0;             //按键4按下标志
    if((key_up == 1) && (P30 == 0 || P31 == 0 || P32 == 0 || P33 == 0))
    {
        key_up = 0;
        if(P30 == 0)          key = 7;
        else if(P31 == 0)     key = 6;
        else if(P32 == 0)     key = 5;
        else if(P33 == 0)
        {
            flag_s4 = 1;                //标记按下
            key = 4;
        }
        return key;
    }
    else if(P30 == 1 && P31 == 1 && P32 == 1 && P33 == 1)
    {
        key_up = 1;
        if(flag_s4 == 1)
        {
            flag_s4 = 0;
            return 40;                  //松手生效
        }
    }
    return 0;
}


/**
 * @brief 矩阵键盘扫描函数
 * 
 * @return uchar 键值对应的元件位号
 */
uchar key_scan2(void)
{
    uchar key = 0;                      //按键值
    static bit key_up = 1;              //按键松开标志，1松开0按下
    static bit flag_s4 = 0;             //按键4按下标志
    P44 = P42 = 1;                      //列扫描
    P32 = P33 = 0;
    if((key_up == 1)&&(P44 == 0 || P42 == 0))
    {
        
        if(P44 == 0)        key = 7;
        else if(P42 == 0)   key = 11;
        else                return 0;
        key_up = 0;                     //标志按下
        P44 = P42 = 0;
        P32 = P33 = 1;                  //行扫描
        if(P32 == 0)   key = key - 2;
        else if(P33 == 0)
        {
            key = key - 3;
            if(key == 4) flag_s4 = 1;   //标记按下，这里判断键值是因为有两种可能s8,s4
        }
        return key;
    }
    else if(P44 == 1 && P42 == 1)
    {
        key_up = 1;                     //松开
        if(flag_s4 == 1)
        {
            flag_s4 = 0;
            return 40;                  //松手生效
        }
    }
    return 0;
}

main.c

//按键处理任务
void key_task(void)
{
    uchar key_num;
    if(key_dly<10)return;
    key_dly = 0;
//    key_num = key_scan1();
    key_num = key_scan2();
    switch (key_num)
    {
        /* 独立按键 */
//        case 4:  state_display = 1;//按下显示界面1
//            break;
//        case 5:  num--;
//            break;
//        case 6:  num++;
//            break;
//        case 7:  flag_L1 ^= 1;
//            break;
//        case 40:  state_display = 0;//松手显示界面0
//            break;
        
        /* 矩阵键盘 */
        case 4:  state_display = 1;//按下显示界面1
            break;
        case 5:  num--;
            break;
        case 8:  num++;
            break;
        case 9:  flag_L1 ^= 1;
            break;
        case 40:  state_display = 0;//松手显示界面0
            break;
    }
}

3、按键进阶-按键禁用（未完待续）

key.c

main.c