main.c

这是在S3C44B0的开发平台下的i/o接口试验

#include "option.h"
#include "def.h"
#include "44b.h"
#include "44blib.h"

void Isr_Init(void);
void HaltUndef(void);
void HaltSwi(void);
void HaltPabort(void);      
void HaltDabort(void);
void __irq keyboard(void);
void clr_pf(char onebit);
void setb_pf(char onebit);

void __irq keyboard(void)
{
    char x=0,y=0,yrecord;
    rINTMSK=(BIT_GLOBAL|BIT_EINT3);
    Delay(200);
    Uart_Printf("come in,   \n");	 
    if((rPDATE&0xf0)==0xf0)
       {
    	      rPDATF=0X1f;
              rINTMSK=~(BIT_GLOBAL|BIT_EINT3);
	      rI_ISPC = BIT_EINT3;
	      return;
       	}
    else
    {  
       for (x=5; x<9; x++)
        {
         rPDATF=0X1ff;
         clr_pf(x);
         if ((rPDATE&0xf0) !=0xf0)
            {
             yrecord=(~((rPDATE&0xf0)>>4))&0xf;
	      for (y=0;  yrecord!=0; y++)  
		  { 
		   yrecord=(yrecord>>1);
		   }
	      setb_pf(x);
	      Uart_Printf("输入的键值是 %d  \n", (y+(x-5)*4-1));
	      Delay(100);
             switch(y+(x-5)*4-1)
	      {
	        case 0:
			        break;
		default: 
                             break;
	     }
	      rPDATF=0X1F;
	      rINTMSK=~(BIT_GLOBAL|BIT_EINT3);
	      rI_ISPC = BIT_EINT3;
	      return;
	      }
         setb_pf(x);
	  }
	  rPDATF=0X1F;
	  rINTMSK=~(BIT_GLOBAL|BIT_EINT3);
         rI_ISPC = BIT_EINT3;
  	  return;
    }
}

/*********************************************************/
 void setb_pf(char onebit)
{
  rPCONF=(rPCONF&0x03ff)|(1<<10)|(1<<13)|(1<<16)|(1<<19) ;
  rPDATF=(rPDATF&0x1ff)|(0x1<<onebit);
}
/*********************************************************/
 void clr_pf(char  onebit)
{
  unsigned int i,s=0;
  for(i=0; i<onebit; i++)
  	{
  	s=(s|(0x1<<i));
  	}
  rPDATF=(rPDATF&0x1ff)&((0x1fe<<onebit)|s);    
}
/***********************************************************************/
void Main(void)
{
    U8 aa;		
    int i=0,j=0;

    rSYSCFG=SYSCFG_8KB;
#if (PLLON==1)
    ChangePllValue(PLL_M,PLL_P,PLL_S);
#endif

    Isr_Init();
    Port_Init();
    Uart_Init(0,115200);
    Uart_Select(0);
    Delay(0);  //calibrate Delay()
    Led_Display(7);
    Delay(1000);  //calibrate Delay()
    Led_Display(0);
    Delay(5000);  //calibrate Delay()
    Led_Display(7);
    Uart_Printf("\n start \n");
    rEXTINT=0x22222222;
    rINTCON=0x5;
    pISR_EINT3=(unsigned)keyboard;
    rPCONF=(rPCONF&0x03ff)|(1<<10)|(1<<13)|(1<<16)|(1<<19) ; //0x92400;  //rPCONG=(rPCONG&0x00ff)|0x5500;
    Uart_Printf("\n请作键盘输入，将会在超级终端看到键值\n");
    rINTMSK =~(BIT_GLOBAL|BIT_EINT3); 
    while(!Uart_GetKey())
    {
    	; 
    }
    rINTMSK|=BIT_EINT3;
}

void Isr_Init(void)
{
    U32 i;
    
    pISR_UNDEF=(unsigned)HaltUndef;
    pISR_SWI  =(unsigned)HaltSwi;
    pISR_PABORT=(unsigned)HaltPabort;
    pISR_DABORT=(unsigned)HaltDabort;
    
     for(i=_RAM_STARTADDRESS;i<(_RAM_STARTADDRESS+0x20);i+=4)
    {
	*((volatile unsigned *)i)=0xEA000000+0x1FFE;
    }

    rINTCON=0x5;	  // Non-vectored,IRQ enable,FIQ disable    

    rINTMOD=0x0;	  // All=IRQ mode
    rINTMSK|=BIT_GLOBAL|BIT_EINT3;	  // All interrupt is masked.
}


void HaltUndef(void)
{
    Uart_Printf("Undefined instruction exception!!!\n");
    while(1);
}

void HaltSwi(void)
{
    Uart_Printf("SWI exception!!!\n");
    while(1);
}

void HaltPabort(void)
{
    Uart_Printf("Pabort exception!!!\n");
    while(1);
}

void HaltDabort(void)
{
    Uart_Printf("Dabort exception!!!\n");
    while(1);
}