main.c

44binit.s ----- 初始化中断、存储器、堆栈等

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

volatile char which_int=0;

void __irq Key_Int(void)
{	

    which_int=rEXTINTPND;
    rEXTINTPND=0xf;		//clear EXTINTPND reg.		
    rI_ISPC=BIT_EINT4567;	//clear pending_bit
    rPCONG=0x0000;	//PG0~7 is Input port
    
    switch(which_int)
    {
        	case 1:
        	    Uart_Printf("EINT4 had been occured...\n");
				Led_Display(1);
        	    which_int=0;
        	    break;
        	case 2:
        	    Uart_Printf("  EINT5 had been occured...\n");
				Led_Display(2);
        	    which_int=0;
        	    break;
        	case 4:
        	    Uart_Printf("    EINT6 had been occured...\n");
				Led_Display(4);
        	    which_int=0;
        	    break;
        	case 8:
        	    Uart_Printf("      EINT7 had been occured...\n");
				Led_Display(0);
        	    which_int=0;
        	    break;
        	default :
        	    break;
    }
 
 	Delay(50) ;		// 
 	while( (rPDATG & 0xf0) != 0xf0 ) ;
 	
	rPCONG=0xffff;	//EINT7~0
}


void Key_Init(void)
{
	rINTCON=0x5;

	rINTMOD=0x0;    //All=IRQ mode

	rEXTINT=0x22222222; //Falling edge mode 
//	rEXTINT=0x0;		//"0" level mode

    rPCONG=0xffff;	//EINT7~0
    rPUPG=0x0;		//pull up enable

    pISR_EINT4567=(unsigned)Key_Int;
    rINTMSK=~(BIT_GLOBAL|BIT_EINT4567);	//start INT
}

void Main(void)
{
    rSYSCFG=CACHECFG;   // Using 8KB Cache//

    Port_Init();
    Uart_Init(0,57600);
    Delay(10);
    Uart_Select(0); //Select UART0
    Led_Display(0x07);
    
   	Uart_Printf( "\n\n\t优龙科技\n" ) ;
   	Uart_Printf( "Http://www.ucdragon.com\n\n" ) ;

   	Uart_Printf( "ST44B0X按键中断测试！\n" ) ;
    Uart_Printf("\n按ST44B0X开发板上的按键 key1 key2 key3 key4!\n\n");
    
    Key_Init();
    while(1);
    
}