蓝桥杯 小蜜蜂 单元训练07：矩阵键盘的基本操作

sbit写法中加入了定时器使用。

#include "stc15f2k60s2.h"

typedef unsigned char uint8_t;

uint8_t timerCounter = 0;
uint8_t timerEnable = 0;

#define LED(X)                   \
    {                            \
        P0 = X;                  \
        P2 = (P2 & 0x1f | 0x80); \
        P2 &= 0x1f;              \
    }
// 数码管
// 段选
#define COM(x)                 \
    {                          \
        P0 = x;                \
        P2 = P2 & 0x1F | 0xc0; \
        P2 &= 0x1F;            \
    }
// 位选
#define SEG(x)                 \
    {                          \
        P0 = x;                \
        P2 = P2 & 0x1F | 0xE0; \
        P2 &= 0x1F;            \
    }
code unsigned char Seg_Table[] =
    {
        0xc0, // 0
        0xf9, // 1
        0xa4, // 2
        0xb0, // 3
        0x99, // 4
        0x92, // 5
        0x82, // 6
        0xf8, // 7
        0x80, // 8
        0x90, // 9
        0x88, // A
        0x83, // b
        0xc6, // C
        0xa1, // d
        0x86, // E
        0x8e  // F
}; // 表不用记，官方提供资源包里面有。

// 数码管第一位显示
void DisplayNo1(uint8_t no)
{
    COM(0x01);
    SEG(Seg_Table[no]);
}

// 矩阵键盘 行
sbit row1 = P3 ^ 0;
sbit row2 = P3 ^ 1;
sbit row3 = P3 ^ 2;
sbit row4 = P3 ^ 3;
// 矩阵键盘 列
sbit col1 = P4 ^ 4;
sbit col2 = P4 ^ 2;
sbit col3 = P3 ^ 5;
sbit col4 = P3 ^ 4;

void ClearRow()
{
    row1 = 0;
    row2 = 0;
    row3 = 0;
    row4 = 0;

    col1 = 1;
    col2 = 1;
    col3 = 1;
    col4 = 1;
}
void ClearCol()
{
    col1 = 0;
    col2 = 0;
    col3 = 0;
    col4 = 0;

    row1 = 1;
    row2 = 1;
    row3 = 1;
    row4 = 1;
}

code uint8_t ArrayNum[4][4] = {
    {0, 1, 2, 3},
    {4, 5, 6, 7},
    {8, 9, 10, 11},
    {12, 13, 14, 15}};

uint8_t keyStatus;

uint8_t key_row;
uint8_t key_col;
uint8_t keyValue = 255;

void KeyScan()
{
    switch (keyStatus)
    {
    case 0:
        ClearCol();
        if ((row1 == 0) || (row2 == 0) || (row3 == 0) || (row4 == 0))
        {
            keyStatus = 1;
        }
        break;
    case 1:
        ClearCol();
        if (row1 == 0)
        {
            key_row = 1;
            keyStatus = 2;
        }
        else if (row2 == 0)
        {
            key_row = 2;
            keyStatus = 2;
        }
        else if (row3 == 0)
        {
            key_row = 3;
            keyStatus = 2;
        }
        else if (row4 == 0)
        {
            key_row = 4;
            keyStatus = 2;
        }
        break;
    case 2:
        ClearRow();
        if (col1 == 0)
        {
            key_col = 1;
            keyStatus = 3;
        }
        else if (col2 == 0)
        {
            key_col = 2;
            keyStatus = 3;
        }
        else if (col3 == 0)
        {
            key_col = 3;
            keyStatus = 3;
        }
        else if (col4 == 0)
        {
            key_col = 4;
            keyStatus = 3;
        }
        break;
    case 3:
        ClearRow();
        if ((col1 == 1) && (col2 == 1) && (col3 == 1) && (col4 == 1))
            keyStatus = 0;
        break;
    default:
        keyStatus = 0;
        break;
    }
}
void SegShow()
{
    if (timerEnable)
        KeyScan();
    timerEnable = 0;
    DisplayNo1(ArrayNum[key_row - 1][key_col - 1]);
}
void Timer0_Init(void) // 1毫秒@12.000MHz
{
    AUXR |= 0x80; // 定时器时钟1T模式
    TMOD &= 0xF0; // 设置定时器模式
    TL0 = 0x20;   // 设置定时初始值
    TH0 = 0xD1;   // 设置定时初始值
    TF0 = 0;      // 清除TF0标志
    TR0 = 1;      // 定时器0开始计时
    ET0 = 1;      // 使能定时器0中断
    EA = 1;
}

void main()
{
    Timer0_Init();

    LED(0xff);
    SEG(0xff);
    COM(0xff);

    while (1)
    {
        SegShow();
    }
}

void Timer0_Isr(void) interrupt 1
{
    if (timerCounter++ == 1) // 1ms
    {
        timerCounter = 0;
        timerEnable = 1;
    }
}