第8章-函数进阶与按键(下,课后作业+抓波欣赏)

2023-08-26 13:35 作者:feifeiluan2 0人读过 | 我要投稿

这节课,真麻烦,全书最难的之一,

// 课后第4题,按一个键K12-DOWN,数码管从F减到0
// 按键的扫描,也结合了http://www.dumenmen.com吴坚鸿老师的思路
// 一切皆计数
#include <reg52.h>

typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef signed char i8;
typedef signed int i16;
typedef signed long i32;

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

// 4个列,要读取
sbit KEYIN1 = P2 ^ 4;
sbit KEYIN2 = P2 ^ 5;
sbit KEYIN3 = P2 ^ 6;
sbit KEYIN4 = P2 ^ 7;

// 4个行,要拉低
sbit KEYOUT1 = P2 ^ 3;
sbit KEYOUT2 = P2 ^ 2;
sbit KEYOUT3 = P2 ^ 1;
sbit KEYOUT4 = P2 ^ 0;

// 数码管code
u8 code LedChar[16] =
{
   0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
   0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};

bit keyFlag = 0; // 0=没有按键;

void main(void)
{
   u8 cnt;

   TMOD = 0x01;
   TH0 = 0xFC;
   TL0 = 0x66;
   ET0 = EA = TR0 = 1;

   ENLED=0;
   ADDR3=1;
   ADDR2=0;
   ADDR1=0;
   ADDR0=0;

   KEYOUT3=0;

   cnt=0x0F;
   P0 = LedChar[cnt];

   while (1)
   {
       if(keyFlag)
       {
           keyFlag=0;
           cnt--;
           cnt&=0x0F;
           P0=LedChar[cnt];
       }
   }
}

void Timer0_ISR(void) interrupt 1
{
   static u16 cnt=0;

   TH0 = 0xFC;
   TL0 = 0x66;

   if(KEYIN4==0)
   {
       cnt++;
       if(cnt==40)//40ms
       {
           keyFlag=1;
       }
   }
   else
   {
       cnt=0;
   }
}

// 课后第5题,减法计算器,干脆扩展成加减乘除
// 在老师的基础上,上=加,下=减,左=乘,右=除(除数为0,不理会)
// 为了简单,不支持连续运算,必须按步奏来
// 步奏0:输入x,输入+/-号等; 得到第一个操作数x和运算符op
// 步奏1:输入y,输入等号得到结果;得到第二个操作数y,,然后计算 y = (x op y)
// 步奏2:再输入+/-号等,回到步奏1;得到下一次的运算符op,上次结果作为第一个操作数x,

// 按键的扫描,也结合了http://www.dumenmen.com吴坚鸿老师的思路
// 一切皆计数
#include <reg52.h>

typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef signed char i8;
typedef signed int i16;
typedef signed long i32;

sbit ADDR0 = P1 ^ 0;
sbit ADDR1 = P1 ^ 1;
sbit ADDR2 = P1 ^ 2;
sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;

// 4个列,要读取
sbit KEYIN1 = P2 ^ 4;
sbit KEYIN2 = P2 ^ 5;
sbit KEYIN3 = P2 ^ 6;
sbit KEYIN4 = P2 ^ 7;

// 4个行,要拉低
sbit KEYOUT1 = P2 ^ 3;
sbit KEYOUT2 = P2 ^ 2;
sbit KEYOUT3 = P2 ^ 1;
sbit KEYOUT4 = P2 ^ 0;

// 数码管code
u8 code LedChar[16] =
{
   0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
   0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};

// 数码管缓冲区
u8 LedBuff[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

u8 key = 0; // 0=没有按键;非零=按键code

u8 code KeyCodeMap[4][4] =
{
   {0x31, 0x32, 0x33, 0x26}, // 数字1,2,3,UP
   {0x34, 0x35, 0x36, 0x25}, // 数字4,5,6,LEFT
   {0x37, 0x38, 0x39, 0x28}, // 数字7,8,9,DOWN
   {0x30, 0x1B, 0x0D, 0x27}, // 数字0,ESC,ENTER,RIGHT

};
void KeyDriver();
void main(void)
{
   TMOD = 0x01;
   TH0 = 0xFC;
   TL0 = 0x66;
   ET0 = EA = TR0 = 1;

   LedBuff[0] = LedChar[0];

   while (1)
   {
       KeyDriver();
   }
}

void ShowNumber(u32 num)
{
   u8 buf[6];
   u8 i, j;

   for (i = 0; i < 6; i++)
   {
       buf[i] = num % 10;
       num /= 10;
   }

   for (i = 5; i >= 1; i--)
   {
       if (buf[i] == 0)
       {
           LedBuff[i] = 0xFF; // 不显示
       }
       else
       {
           break;
       }
   }
   for (j = 0; j <= i; j++)
   {
       LedBuff[j] = LedChar[buf[j]];
   }
}
void KeyAction(u8 keycode)
{
   static u8 step = 0;
   static u32 result = 0;
   static u32 addend = 0;
   static u8 op;

   if (keycode == 0x1B) // esc
   {
       addend = 0;
       result = 0;
       step = 0;
       ShowNumber(0);
       return;
   }

   switch (step)
   {
   case 0:
       // 步奏0:输入x,输入+/-号等; 得到第一个操作数x和运算符op
       if (keycode >= '0' && keycode <= '9')
       {
           addend = addend * 10 + keycode - '0';
           ShowNumber(addend);
       }
       else if (keycode == 0x25 || keycode == 0x26 || keycode == 0x27 || keycode == 0x28) // 加减乘除
       {
           result = addend;
           addend = 0;
           op = keycode;
           ShowNumber(0);
           step++;
       }
       break;
   case 1:
       // 步奏1:输入y,输入等号得到结果;得到第二个操作数y,,然后计算 y = (x op y)
       if (keycode >= '0' && keycode <= '9')
       {
           addend = addend * 10 + keycode - '0';
           ShowNumber(addend);
       }
       else if (keycode == 0x0D) // enter =
       {
           if (op == 0x26) //+
           {
               result += addend;
           }
           else if (op == 0x28) //-
           {
               result -= addend;
           }
           else if (op == 0x25) //*
           {
               result *= addend;
           }
           else if (op == 0x27) // /
           {
               if (addend != 0)
               {
                   result /= addend;
               }
           }
           ShowNumber(result);
           step++;
       }
       break;
   case 2:
       // 步奏2:再输入+/-,回到步奏1;得到下一次的运算符op,上次结果作为第一个操作数x,
       if (keycode == 0x25 || keycode == 0x26 || keycode == 0x27 || keycode == 0x28) // 加减乘除
       {
           op = keycode;
           addend = 0;
           ShowNumber(0);
           step = 1;
       }
       break;
   default:
       break;
   }
}
void KeyDriver(void)
{
   if (key)
   {
       KeyAction(key);
       key = 0;
   }
}

void KeyScan(void)
{
   static u8 step = 0;
   static u8 hang = 0; // 控制4个线拉低
   static u16 cnt = 0;

   switch (step)
   {
   case 0: // 拉低1行
       if (hang == 0)
       {
           KEYOUT4 = 1;
           KEYOUT1 = 0;
       }
       else if (hang == 1)
       {
           KEYOUT1 = 1;
           KEYOUT2 = 0;
       }
       else if (hang == 2)
       {
           KEYOUT2 = 1;
           KEYOUT3 = 0;
       }
       else if (hang == 3)
       {
           KEYOUT3 = 1;
           KEYOUT4 = 0;
       }
       step++; // 进入下一步,1ms以后进来读取列
       break;
   case 1:
       if (KEYIN1 && KEYIN2 && KEYIN3 && KEYIN4)
       {
           // 没有任何按键按下,或者发生了抖动
           cnt = 0;
           // 切换下一行拉低
           hang++;
           hang &= 0x03;
           step = 0; // 回到第一步
       }
       else
       {
           cnt++;           // 有按键按下,计数器++
           if (cnt == 40) // 能坚持到40ms的,算一次合理按键
           {
               u8 lie;
               if (KEYIN1 == 0)
               {
                   lie = 0;
               }
               else if (KEYIN2 == 0)
               {
                   lie = 1;
               }
               else if (KEYIN3 == 0)
               {
                   lie = 2;
               }
               else if (KEYIN4 == 0)
               {
                   lie = 3;
               }
               key = KeyCodeMap[hang][lie];
           }
       }
       break;
   }
}

void LedScan(void)
{
   static u8 i = 0;

   ENLED = 1; // 关闭138;
   ADDR3 = 1; //确保选138的后八路

   P1 &= 0xF8; // 1111-1000
   P1 |= i;    // xxxx-xiii;
   P0=LedBuff[i];

   ENLED = 0;

   if (++i == 6)
   {
       i = 0;
   }
}

void Timer0_ISR(void) interrupt 1
{
   TH0 = 0xFC;
   TL0 = 0x66;
   LedScan();
   KeyScan();
}