#include 
#include 
#include 
#include 
#include
#include "scancodes.h"
#include "74c922.h"

 
#define GETPSDATA() ((PIND>>PIND7)&0x1)     //connect to PD7
#define GETPSCLK() ((PIND>>PIND2)&0x1) //connetc to PD2

static unsigned char IntNum = 0; //count the interrupt
static unsigned char KeyV; //it is the key Value
static unsigned char DisNum = 1; //显示用指针
static unsigned char Key_UP=0;//Key_UP means release the key, Shift = 0
static unsigned char BF = 0; //标识是否有字符被收到 

SIGNAL(SIG_INTERRUPT0)
{
 if ((IntNum > 0) && (IntNum < 9))
  { 
            KeyV = KeyV >> 1; //因键盘数据是低>>高，结合上一句所以右移一位
   if (GETPSDATA()) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
  }
 IntNum++;
 while (!GETPSCLK()); //等待PS/2CLK拉高

 if (IntNum > 10)
  {
   IntNum = 0; //当中断11次后表示一帧数据收完，清变量准备下一次接收
   BF = 1; //标识有字符输入完了
   cli(); //关中断等显示完后再开中断 (注：如这里不用BF和关中断直接调Decode()则所Decode中所调用的所有函数要声明为再入函数)
  }
}

void Decode(unsigned char ScanCode) //注意:如SHIFT+G为12H 34H F0H 34H F0H 12H，也就是说shift的通码+G的通码+shift的断码+G的断码
{
 unsigned char TempCyc; 
 if (!Key_UP)                //当键盘松开时
  {
   switch (ScanCode) {
    case 0xF0 :Key_UP = 1;break;// 当收到0xF0，Key_UP置1表示断码开始
    default:
     if (DisNum > 16)
         {
         DisNum = 1;
      Clear_Screen();
      }
     
      for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<60); TempCyc++); //查表显示
      if (UnShifted[TempCyc][0] == ScanCode)
       {
       Write_Position(2,DisNum);
       Write_Data(UnShifted[TempCyc][1]);
       }
      DisNum++;
      
     break;
   }
  }
 else
  { 
   Key_UP = 0;
  }
 BF = 0; //标识字符处理完了
}


int main(void)
{
 DDRD=0x70;
 PORTD=0x00;
 Initialize_LCD();
 Write_Position(1,1);
 Write_String("hello");
 GICR=(1<  MCUCR=(1<  sei();//start the interrupt
 do
  {
   if (BF)
    Decode(KeyV);
   else
    sei(); //开中断
  }
 while(1);
}

 

 

"scancodes.h"

unsigned char/* code*/ UnShifted[59][2] = {
0x1C, 'a',
0x32, 'b',
0x21, 'c',
0x23, 'd',
0x24, 'e',
0x2B, 'f',
0x34, 'g',
0x33, 'h',
0x43, 'i',
0x3B, 'j',
0x42, 'k',
0x4B, 'l',
0x3A, 'm',
0x31, 'n',
0x44, 'o',
0x4D, 'p',
0x15, 'q',
0x2D, 'r',
0x1B, 's',
0x2C, 't',
0x3C, 'u',
0x2A, 'v',
0x1D, 'w',
0x22, 'x',
0x35, 'y',
0x1A, 'z',
0x45, '0',
0x16, '1',
0x1E, '2',
0x26, '3',
0x25, '4',
0x2E, '5',
0x36, '6',
0x3D, '7',
0x3E, '8',
0x46, '9',
0x0E, '`',
0x4E, '-',
0x55, '=',
0x5D, '',
0x29, ' ',
0x54, '[',
0x5B, ']',
0x4C, ';',
0x52, ''',
0x41, ',',
0x49, '.',
0x4A, '/',
0x71, '.',
0x70, '0',
0x69, '1',
0x72, '2',
0x7A, '3',
0x6B, '4',
0x73, '5',
0x74, '6',
0x6C, '7',
0x75, '8',
0x7D, '9',
};

unsigned char/* code*/ Shifted[59][2] = {
0x1C, 'A',
0x32, 'B',
0x21, 'C',
0x23, 'D',
0x24, 'E',
0x2B, 'F',
0x34, 'G',
0x33, 'H',
0x43, 'I',
0x3B, 'J',
0x42, 'K',
0x4B, 'L',
0x3A, 'M',
0x31, 'N',
0x44, 'O',
0x4D, 'P',
0x15, 'Q',
0x2D, 'R',
0x1B, 'S',
0x2C, 'T',
0x3C, 'U',
0x2A, 'V',
0x1D, 'W',
0x22, 'X',
0x35, 'Y',
0x1A, 'Z',
0x45, '0',
0x16, '1',
0x1E, '2',
0x26, '3',
0x25, '4',
0x2E, '5',
0x36, '6',
0x3D, '7',
0x3E, '8',
0x46, '9',
0x0E, '~',
0x4E, '_',
0x55, '+',
0x5D, '|',
0x29, ' ',
0x54, '{',
0x5B, '}',
0x4C, ':',
0x52, '"',
0x41, '<',
0x49, '>',
0x4A, '?',
0x71, '.',
0x70, '0',
0x69, '1',
0x72, '2',
0x7A, '3',
0x6B, '4',
0x73, '5',
0x74, '6',
0x6C, '7',
0x75, '8',
0x7D, '9',
};