ps2().c

PS2 键盘可靠控制c源码

#include "config.h"
unsigned char  key_sign=0;   
const unsigned char PS2TAB[] = {//20键PS2小键盘键码表
  0x70,// '0',
  0x69,// '1',
  0x72,// '2',
  0x7A,// '3',
  0x6B,// '4',
  0x73,// '5',
  0x74,// '6',
  0x6C,// '7',
  0x75,// '8',
  0x7D,// '9',
  0x7c,// '*;
  0x5a,// Enter
  0x4a,// '/'
  0x79,// '+'
  0x7b,// '-'
  0x66,// '<-'
  0x71,// del.
  };
struct Keyboard_Information
{	
	unsigned char PS2KeyCount;//脉冲计数
	unsigned char PS2KeyExtFlage;
	unsigned char PS2KeyTemp;
	unsigned char PS2KeyPopError;//出错类别
	unsigned char PS2KeyPushCount;
	unsigned char PS2KeyMessage;
	unsigned char PS2KeyVal;
};
 Keyboard_Information PS2Buffers ;
void ps2_init(void)
       {
	   DDRE&=~BIT(4);
	   DDRE&=~BIT(5);
	   PORTE|=BIT(4);
	   PORTE|=BIT(5);
	   SREG=0X80;
	   MCUCR=0X00;
	   
	   EICRB=0X02; 
       EIMSK=0X10;
         
		 
		 
       }
	   
/*------------------------------------
     PS2键盘外部INT1中断服务程序

原创:           [e-mail]   
------------------------------------*/
#pragma interrupt_handler PS2_KEY:6

void PS2_KEY(void) 
{
unsigned char i,j,ACC, key;

  if (PS2Buffers.PS2KeyCount == 0)
  {//PS2起始位测试
    if (!PS2CLOCK && !PS2DATA)
	{//低电平是起始位
      if (PS2Buffers.PS2KeyExtFlage != 0xf0)
	  {
        PS2Buffers.PS2KeyTemp = 0;
        PS2Buffers.PS2KeyExtFlage = 0;
        PS2Buffers.PS2KeyPopError = 0;
      }
      PS2Buffers.PS2KeyCount ++;//脉冲计数
    }
    else PS2Buffers.PS2KeyPopError = 0xeb;//置键起始位错误号0xeb
  }
  else if (PS2Buffers.PS2KeyCount < 9)
  {//PS2数据位
    key = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据
    key >>= 1;
    if (PS2DATA) key |= 0x80;
    PS2Buffers.PS2KeyTemp = key;
    PS2Buffers.PS2KeyCount++;//脉冲计数
  }
  else if (PS2Buffers.PS2KeyCount == 9){//PS2数据奇校验
         for(j=0,ACC=0;j<8;j++){
		  if(PS2Buffers.PS2KeyTemp&(1<<j)==1)
		      ACC++;
			  ACC/=2;}
	ACC = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据(C51取偶校验位)
    if (ACC != PS2DATA)
	  PS2Buffers.PS2KeyCount ++;//脉冲计数
    else{
      PS2Buffers.PS2KeyPopError = 0xec;////置键奇校验位错误号0xec
      PS2Buffers.PS2KeyCount = 0;//脉冲计数归零
    }
  }
  else if (PS2Buffers.PS2KeyCount == 10){//停止位
    key = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据
    PS2Buffers.PS2KeyCount = 0;//脉冲计数归零
    if (PS2DATA){//高电平是停止位
      if (key == 0xe0){//本次是扩展键
        PS2Buffers.PS2KeyExtFlage = 0xe0;//置扩展键标志(小键盘只有回车键)
      }
      else if (key == 0xf0)
	  {//本次是键断码，键释放
        PS2Buffers.PS2KeyExtFlage = 0xf0;//置键释放标志
     
	  }
      else{//本次必为键值
	   
        if ((key == 0xaa) || (key == 0xfa)) PS2Buffers.PS2KeyPushCount = 0;//长压键计数器清零
        else{
		    DDRE|=0x10;
            PINE&=~(1<<PINE4);//阻止PS2键盘立即回送数据
            PS2Buffers.PS2KeyPopError = 0xaa;//出错码
          for (i = 0; i < 17; i++){
            if (key == (PS2TAB[i]))
			 {//搜索
              key = i ;
              if (PS2Buffers.PS2KeyExtFlage == 0xf0)
			  {
                key |= 0x80;//键释放
                PS2Buffers.PS2KeyPushCount = 0;//长压键计数器清零
                PS2Buffers.PS2KeyMessage = key;//存入当前键值并执行命令
              }
              else{
                if (key != PS2Buffers.PS2KeyVal)
				  {//换了一个键
                  PS2Buffers.PS2KeyPushCount = 0;//长压键计数器清零
                  PS2Buffers.PS2KeyMessage = key;//存入当前键值并执行命令
                  }
                else{//未换键
                  PS2Buffers.PS2KeyPushCount ++;//长压键计数器计数
                  if (PS2Buffers.PS2KeyPushCount > DEFPS2PUSHCOUNT)
				     {//长压时间到
                      PS2Buffers.PS2KeyMessage = key | 0x40;//存入当前键值并执行命令
                      PS2Buffers.PS2KeyPushCount = 0;//长压键计数器清零
                     }
                    }
              }
              PS2Buffers.PS2KeyVal = key;//存入当前键值值1~20或0x80+(1~20)
              PS2Buffers.PS2KeyTemp = 0;//键码移位记录器
              PS2Buffers.PS2KeyExtFlage = 0;//扩展键标志
              PS2Buffers.PS2KeyPopError = 0;//键释放标志或出错码
              break;
            }
          }
          if (PS2Buffers.PS2KeyPopError) PS2Buffers.PS2KeyPushCount = 0;//长压键计数器清零
          PINE|=(1<<PINE4);//释放PS2时钟总线
		  DDRE&=~0X10;
        }
      }
    }
    else PS2Buffers.PS2KeyPopError = 0xed;//置停止位错误号0xed
  }
  else PS2Buffers.PS2KeyCount = 0;//PS2键盘出错
}