ps2keyboard.c

44BO作为PS/2主机端与普通PC键盘通信源程序

#include "Target\44blib.h"
#include "Target\44b.h"
#include "ps2keytest\KeyNumTab.h"

#define SetIn_PC15  (0x3FFFFFFF) 		//set rPCONC,PC15 Input
#define En_Eint2    (0x0030)			//set rPCONG,enable EINT4
#define Setout_PG4  (0x0100)			//set rPCONG,PG4 Output
#define FallTrig	(0x00000200)		//set rEXTINT,Falling trigger
#define KeysNum		(71)				//display KeyBoard keys number

void __irq Eint2Isr(void);

volatile char which_int=0;
volatile int  IntNum=0,KeyV=0;

void Disp_KeyDat(void)
{   
	int Key_Dat=0,n;
	unsigned char m[4];
	Uart_Printf("Wait KeyBoard key.....\n");
	do
	{
	  Key_Dat=PS2_GetKeyDat();
	 
	  //Uart_Printf("KeyNum=0x%x\n",Key_Dat);
	  for(n=0;n<=KeysNum;n++)
	  {
	  	if(UnShifted[n][0]==Key_Dat)
	  	{	m[0]=UnShifted[n][1];
	  		m[1]=UnShifted[n][2];
	  		m[2]=UnShifted[n][3];
	  		m[3]=0;
	  		Uart_Printf("%s",m);
	  	}
	 Delay(10);	
	  }	
	  
	}while(!(Key_Dat==0x5a)); 
	
}

int PS2_GetKeyDat(void)
{
    unsigned int save_G,save_PG,save_C,save_PC,KeyV1=0; 	//use save I/O Register
    unsigned int i,Key_temp=0,High_Num=0;
    
    rINTCON=0x1;  							//disable fiq, enable irq
    rINTMOD=0x0;							//IRQ mode
    pISR_EINT2=(int)Eint2Isr;				//convection address
    rINTMSK=~(BIT_GLOBAL|BIT_EINT2);  		//ex_interrupt 2 service available 
    rEXTINT=FallTrig;  						//Falling edge mode ,Falling trigger
    
    save_G=rPCONG;
    save_PG=rPUPG;
    save_C=rPCONC;
    save_PC=rPUPC;
        
    rPCONC=SetIn_PC15;    	//PC15 Input
    rPUPC=0x0;				//pull up enable
    rPCONG=En_Eint2;		//EINT2 enable
    rPUPG=0x04;				//pull up enable 
       
	KeyV=0;
	while(IntNum<11);
	rINTMSK=BIT_GLOBAL;
	//Uart_Printf("KeyNum00=0x%x\n",KeyV);
		
    Key_temp=KeyV;    
    for(i=10;i>0;i--)
	  {
		if((Key_temp & 0x1) == 1)
		{
			High_Num++;
			Key_temp= Key_temp >> 1;
		}
		else 
			Key_temp= Key_temp >> 1;
	  }
	  
	  if(High_Num==1||High_Num==3||High_Num==5||High_Num==7||High_Num==9)
		KeyV1=KeyV & 0xff;
	  else 
		KeyV1=0;
	//Uart_Printf("KeyNum01=0x%x\n",KeyV1);
	    
	//rINTMSK=BIT_GLOBAL;
    
    rPCONG=save_G;
    rPUPG=save_PG;
    rPCONC=save_C;
    rPUPC=save_PC;
    //which_int=0;
    IntNum=0;
    Key_temp=0;
    High_Num=0;
    
    return KeyV1;
    
    //rINTCON=0x5;
}


void __irq Eint2Isr(void)
{
    //which_int=rEXTINTPND;
    //if (which_int==1)
    //{
    	KeyV=(rPDATC & 0x8000) | KeyV;
    	KeyV = KeyV >> 1; 		//Right move 1 bit	
		
    	IntNum++;
    	if (IntNum==11)
    	{    	   		
		KeyV=KeyV>>6;
		KeyV=KeyV&0x1ff;
		    	 
		}
	//}
	//Uart_Printf("KeyNum=%x\n",KeyV);
	rEXTINTPND=0x0f;		//clear EXTINTPND reg.		
    rI_ISPC=BIT_EINT2;	//clear pending_bit	
}