main.c

这是一个标准的s3c44b0x向量中断程序

/****************************************************************************
【文  件  名  称】main.c
【功  能  描  述】三星S3C44B0X板demo程序代码
【程  序  版  本】4.0
【创建人及创建日期】龚俊//2002年11月19日19:26
【修改人及修改日期】龚俊//2004-12-8 17:25
****************************************************************************/

//***************************************************************************
#include "def.h"
#include "44b.h"
#include "44blib.h"

/****************************************************************************
【功能说明】外部电平中断EINT4567响应
****************************************************************************/
volatile char which_int_key = 0 ;
void __irq Key_Interrupt(void)
{	
    which_int_key = rEXTINTPND ;
    rEXTINTPND = 0xf ;		//clear EXTINTPND reg.		
    rI_ISPC = BIT_EINT4567 ;		//clear pending_bit

    rPCONG = rPCONG & (~(0x3f<<10));		//GPC567 is input

    switch(which_int_key)
   {
        	case 2:
        	    Uart_Printf("\nEINT5 had been occured...\n");
				Led_Display(0x2);
        	    which_int_key=0;
        	    break;
        	case 4:
        	    Uart_Printf("\nEINT6 had been occured...\n");
				Led_Display(0x4);
        	    which_int_key=0;
        	    break;
        	case 8:
        	    Uart_Printf("\nEINT7 had been occured...\n");
				Led_Display(0x8);
        	    which_int_key=0;
        	    break;
        	default :
        	    break;
    }
 
 	while( (rPDATG&0x00e0) != 0x00e0  ) ;
 	Delay( 50 ) ;		//
    rPCONG = rPCONG | ( 0x3f<<10 );		//EINT7~5
}

/****************************************************************************
【功能说明】系统主函数
****************************************************************************/
void Main(void)
{
	rNCACHBE0 = ((Non_Cache_End>>12)<<16)|(Non_Cache_Start>>12);
    //在上面的数据区域不使用高速缓存

    rSYSCFG = CACHECFG;    //8K字节cache，写缓冲使能，data abort使能

    Port_Init();		//IO口初始化

	Uart_Select( 0 ) ;		//选择串口0
	Uart_Init( 0, 115200 ) ;		
		//串口初始化，波特率为115200（系统主频为32MHz）

	Uart_Printf( "\nInterrupt Test!\n" );

    rINTMSK = 0x7ffffff;	  // All interrupt is masked.
    pISR_EINT4567 = (unsigned)Key_Interrupt ;

	rINTCON = 0x1 ;		//向量中断模式
	rINTMOD = 0x0 ;		//All=IRQ mode

    rPCONG = rPCONG | ( 0x3f<<10 );		//EINT7~5
    rPUPG = rPUPG & (~(7<<5)) ;		//pull up resister is enable
	rEXTINT = rEXTINT & (~(0xfff<<20)) ;		//EINT567低电平触发中断
	//rEXTINT = rEXTINT & (~(0x222<<20)) ;		//EINT567下降沿中断
	
    pISR_EINT4567 = (unsigned)Key_Interrupt ;
    rINTMSK = ~( BIT_GLOBAL | BIT_EINT4567 ) ;		//start INT

	Uart_Printf( "\nPlease press the button key2,key3,key4!\n" );
	
    while( 1 ) 
    {
		Led_Display(0x05);		//LED点亮/熄灭状态设置
		Delay(5000);
		Led_Display(0x0a);		//LED点亮/熄灭状态设置
		Delay(5000);
    }

}