ps2keyborddriver.c

基于MEGA16的PS2键盘驱动程序

#include <intrinsics.h> 
#include <iom16.h>
#define uchar unsigned char
#define uint  unsigned int
//===================定义MCU与LCD的接口===================
#define set_lcd_en PORTB|=0x80;
#define clr_lcd_en PORTB&=0x70;
#define set_lcd_rw PORTB|=0x40;  
#define clr_lcd_rw PORTB&=0xb0;
#define set_lcd_rs PORTB|=0x20;
#define clr_lcd_rs PORTB&=0xd0;
//#define Key_Data PORTC_Bit3
//#define Key_CLK  PORTC_Bit2
void LCD_init         (void);
void avr_io_int       (void);
void LCD_wait_Ready(void); 
void writecommend(unsigned char c);
void writedata(unsigned char c);
void showchar(unsigned char pos,unsigned char c);
void showstring(unsigned char line, unsigned char *ptr);
void Decode(unsigned char ScanCode);

unsigned char cdle_net[] = {"GOOD LUCK TO YOU"};
unsigned char email[] = {"WRITE BY XIAOTAO"};
unsigned char Cls[] = {"                "};
static unsigned char IntNum = 0; //中断次数计数
static unsigned char KeyV; //键值
static unsigned char DisNum = 0; //显示用指针
static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
static unsigned char BF = 0; //标识是否有字符被收到


////////////////////////////////////////////////////
unsigned char 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 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',
};
///////////////////////////////////////////////////

//----------------------------------------------------------------------
void avr_io_int(void)
{DDRA=0XFF;
 PORTA=0XFF;
  DDRC=0x00;
  PORTC=0x0F;
  DDRB=0xF0;
  PORTB=0x00;

}

//========================================================
void LCD_init(void)
  {
  
   writecommend(0x38);
   writecommend(0x38);
   writecommend(0x06);
   writecommend(0x0c);
   writecommend(0x01);
   writecommend(0x80);
  }



void writecommend(unsigned char c)//写指令
{
LCD_wait_Ready();
PORTA&=0x00;
PORTA=c;
clr_lcd_rs;
clr_lcd_rw;
clr_lcd_en;
set_lcd_en;
 __delay_cycles(5);
clr_lcd_en;
 

 }

void LCD_wait_Ready(void)                  //等待LCD空闲
  {
    DDRA&=0x00;                 //PC7 I/O口方向设置为输入
    set_lcd_rw;                 //RW=1
    clr_lcd_rs;                //RS=0
    set_lcd_en;                 //EN=1
    while(PINA&0x80);   //RW=1,读PC7，为0表示空闲；
    clr_lcd_en;                //EN=0
    DDRA|=0xff;
  }
void writedata(unsigned char c)	  //写数据
{LCD_wait_Ready();
PORTA&=0x00;
PORTA=c;
set_lcd_rs; 
clr_lcd_rw;
clr_lcd_en;
set_lcd_en;
 __delay_cycles(5);
 clr_lcd_en;
} 
void showchar(unsigned char pos,unsigned char c)
{unsigned char p;
  if(pos<0x10) p=pos+0x80;
  else p=pos+0xb0;
  writecommend(p);
  writedata(c);
 }
 void showstring(unsigned char line,unsigned char*prt)
 {unsigned char l,i;
   l=line*0x10;
    for(i=0;i<16;i++)
	 showchar(l++,*(prt+i));
 }

 //////////////////////////////////////////////////
//5ms延时
void Delay5Ms(void)
{
unsigned int TempCyc = 5552;
while(TempCyc--);
}

//400ms延时
void Delay400Ms(void)
{
unsigned char TempCycA =5;
unsigned int TempCycB;
while(TempCycA--)
  {
   TempCycB=7269;
   while(TempCycB--);
  };
}
//////////////////////////////////////////////////

//***************************外部中断0初试化***************//
void INT1_Init(void)
{/*MCUCR=MCUCR|0x08;       //INT1下降沿中断
 GICR=GICR|0x80;       //INT1中断使能
 SREG=SREG|0x80;         //全局中断使能*/
 //MCUCR=MCUCR&0xfc;   //INT1下降沿中断
  MCUCR=MCUCR|0x02; 
 GICR=GICR|0x40;       //INT1中断使能
 SREG=SREG|0x80;         //全局中断使能*/
}

//////////////////////////////////////////////////////////////
void main()
{ unsigned char TempCyc;
  Delay400Ms(); //启动等待，等LCM讲入工作状态
  avr_io_int();
  LCD_init();
  Delay5Ms(); //延时片刻(可不要)
  showstring(0,cdle_net);
  showstring(1, email);
 
  
  for (TempCyc=0; TempCyc<10; TempCyc++)
   Delay400Ms(); //延时
  showstring(1, Cls);
   INT1_Init();
   do
  {
   if (BF)
    Decode(KeyV);
	  else
   SREG=SREG|0x80;         //全局中断使能
  }
while(1);

  
 
  
 //showstring(1,str1);  //显示数组时，前面一位代表显示在第几行
  
 //showchar(0,'1');   //显示字符时，前面一位代表显示在哪个位置
}

#pragma vector= INT0_vect  
__interrupt void INT0_isr(void)
{
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 (PIND&0x08) KeyV = KeyV | 0x80; //当键盘数据线为1时为1到最高位
  }
IntNum++;
while (!(PIND&0x04)); //等待PS/2CLK拉高

if (IntNum > 10)
  {
   IntNum = 0; //当中断10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
   SREG=SREG&0x7f;  //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 : // 当收到0xF0，Key_UP置1表示断码开始
      Key_UP = 1;

      break;

     case 0x12 : // 左 SHIFT
      Shift = 1;
     break;

     case 0x59 : // 右 SHIFT
      Shift = 1;
     break;

     default:      
       if (DisNum > 15)
       {
        showstring(1, Cls);//清LCD第二行
        DisNum = 0; 
       }
      if(!Shift) //如果SHIFT没按下
       {
        for (TempCyc = 0;(UnShifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
        if (UnShifted[TempCyc][0] == ScanCode) showchar(DisNum+16, UnShifted[TempCyc][1]);
        DisNum++;
       } 
      else  //按下SHIFT
	    {
        for(TempCyc = 0; (Shifted[TempCyc][0]!=ScanCode)&&(TempCyc<59); TempCyc++); //查表显示
        if (Shifted[TempCyc][0] == ScanCode) showchar(DisNum+16, Shifted[TempCyc][1]);
        DisNum++;
       }

     break;
    }
  }
else
  { 
   Key_UP = 0;
   switch (ScanCode) //当键松开时不处理判码，如G 34H F0H 34H 那么第二个34H不会被处理
    {
     case 0x12 : // 左 SHIFT
      Shift = 0;
     break;

     case 0x59 : // 右 SHIFT
      Shift = 0;
     break;
    }
  }
BF = 0; //标识字符处理完了
}