行列式键盘 - - Powered by Discuz!

标题: 行列式键盘 [打印本页]

作者: 12345tg 时间: 2018-8-4 09:23
标题: 行列式键盘
#include <reg51.h>
#define KeyPort P1
#define DataPort P0
//#define function 1  //0行列逐级扫描，1翻转扫描
sbit Seg_Latch = P2^2; //段锁存
sbit Bit_Latch = P2^3; //位锁存
unsigned char KeyPro(void);
unsigned char KeyScan(void);
void DelayMs(unsigned int n);
void DelayUs2x(unsigned int n);
void display(unsigned char firstbit, unsigned char num);
unsigned char TempData[10];
unsigned char code Seg_Code[]=
{
0x3f,0x06,0x5b,0x4f, //0~3
0x66,0x6d,0x7d,0x07, //4~7
0x7f,0x6f,0x77,0x7c, //8~b
0x39,0x5e,0x79,0x71, //c~f
0x40 //c~f
};
unsigned char code Bit_Code[] =
{
  0xfe,0xfd,0xfb,0xf7,
  0xef,0xdf,0xbf,0x7f
};
/*------------------------------------------------
                  定时器初始化子程序
------------------------------------------------*/
void Init_Timer0(void)
{
TMOD |= 0x01; //使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响
// TH0=(65536-2000)/256;    //给定初值
// TL0=(65536-2000)%256;
EA=1;          //总中断打开
ET0=1;          //定时器中断打开
TR0=1;          //定时器开关打开
}
/*------------------------------------------------
               定时器中断子程序
------------------------------------------------*/
void Timer0_isr(void) interrupt 1
{
TH0=(65536-2000)/256; //重新赋值 2ms
TL0=(65536-2000)%256;

display(0,8);    // 调用数码管扫描
}
void main()
{
unsigned char num,i,j;
unsigned char temp[8];
Init_Timer0();

while(1)
{
  num = KeyPro();
  if(num != 0xff)
  {
if(i<8)
{
   temp[i] = Seg_Code[num];
   for(j=0;j<=i;j++)
   {
   TempData[7-i+j]=temp[j];
   }
}
   i++;
   if(i == 9)
   {
   i = 0;
   for(j=0;j<8;j++)//清屏
   TempData[j]=0;
   }
  }
}

}
/*------------------------------------------------
      按键扫描函数，返回扫描键值
------------------------------------------------*/
//#if function
unsigned char KeyScan(void)//行列逐级扫描
{
unsigned char KeyVal;
KeyPort = 0xf0;
if(KeyPort != 0xf0)//如果有键盘按下，则高四位有键按下
{
  DelayMs(10);//去抖
  if(KeyPort != 0xf0)//键还在
  {
KeyPort = 0xfe;//检测第一行
if(KeyPort != 0xfe)
{
   KeyVal = KeyPort & 0xf0;
   KeyVal += 0x0e;
   DelayMs(10);
while(KeyPort != 0xfe);
return KeyVal;
}


KeyPort = 0xfd;//检测第二行
if(KeyPort != 0xfd)
{
   KeyVal = KeyPort & 0xf0;
   KeyVal += 0x0d;
   DelayMs(10);
while(KeyPort != 0xfd);
return KeyVal;
}

KeyPort = 0xfb;//检测第三行
if(KeyPort != 0xfb)
{
   KeyVal = KeyPort & 0xf0;
   KeyVal += 0x0b;
   DelayMs(10);
while(KeyPort != 0xfb);
return KeyVal;
}

KeyPort = 0xf7;//检测第四行
if(KeyPort != 0xf7)
{
   KeyVal = KeyPort & 0xf0;
   KeyVal += 0x07;
   DelayMs(10);
while(KeyPort != 0xf7);
return KeyVal;
}
  }
}
return 0xff;
}
//#elif !function
/*unsigned char KeyScan(void)//行列翻转扫描
{
unsigned char key_row,key_column;//行列的中间变量
KeyPort = 0x0f;//列为0
key_row = KeyPort & 0x0f;//读行值
if(key_row != 0x0f)//检测是否有按键按下
{
  DelayMs(10);
  if((KeyPort & 0x0f) != 0x0f)//键还在按下
  {
key_row = KeyPort & 0x0f;//读行值
KeyPort = key_row | 0xf0;//翻转扫描
key_column = KeyPort & 0xf0;//读列值
while((KeyPort & 0xf0) != 0xf0);//等待按键释放
return (key_row+key_column);//返回键值，第四位行，高四位列
  }
}
return 0xff;
}
#endif
*/
/*------------------------------------------------
      按键值处理函数，返回扫键值
------------------------------------------------*/

unsigned char KeyPro(void)
{
switch(KeyScan())
{
  case 0x7e:return 0;break;//0 按下相应的键显示相对应的码值
  case 0xbe:return 1;break;//1
  case 0xde:return 2;break;//2
  case 0xee:return 3;break;//3
  case 0x7d:return 4;break;//4
  case 0xbd:return 5;break;//5
  case 0xdd:return 6;break;//6
  case 0xed:return 7;break;//7
  case 0x7b:return 8;break;//8
  case 0xbb:return 9;break;//9
  case 0xdb:return 10;break;//a
  case 0xeb:return 11;break;//b
  case 0x77:return 12;break;//c
  case 0xb7:return 13;break;//d
  case 0xd7:return 14;break;//e
  case 0xe7:return 15;break;//f
  default:return 0xff;break;

}
}
void display(unsigned char firstbit, unsigned char num)
{
  static unsigned char i;
DataPort = 0;          //清除数据
Seg_Latch = 1;       //开门
Seg_Latch = 0;       //关门

DataPort = Bit_Code[firstbit + i]; //送位码
Bit_Latch = 1;       //开门
Bit_Latch = 0;       //关门

DataPort = TempData[i] ; //送段码
Seg_Latch = 1;       //开门
Seg_Latch = 0;    //关门
i++;
if(i==num)
   i=0;

}
void DelayUs2x(unsigned int n)
{
  while(--n);
}
void DelayMs(unsigned int n)
{
  while(n--)
  {
DelayUs2x(245);
DelayUs2x(245);
  }
}

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