interrupt.c

pxa270嵌入式开发板中断应用实例

#include <stdio.h>


#define LED_CS2   	(*((volatile unsigned short int *)(0x10300000)))	//LED1 and LED2
#define LED_CS3   	(*((volatile unsigned short int *)(0x10400000)))	//LED3 and LED4

#define KPDK_VALUE	(*((volatile unsigned char *)(0x41500008)))		//Direct Keypad
#define KPAS_VALUE	(*((volatile unsigned char *)(0x41500020)))		//Matrix Keypad


void IRQ_Function(void)
{	
	char i;
	char j;
	unsigned short int kbd_buff;
	i = KPDK_VALUE;					
	j = KPAS_VALUE;					

	switch (i)
	{
			
		case 0x40:					//key-press 1
			kbd_buff=0x8F79;
			LED_CS2 = kbd_buff;
			LED_CS3 = 0x8F8F;	
			break;
					
		case 0x02:  				//key-press 2
			kbd_buff=0x248F;
			LED_CS2 = kbd_buff;
			LED_CS3 = 0x8F8F;
			break;
					
		case 0x04:  				//key-press 3
			kbd_buff=0x8F30;
			LED_CS3 = kbd_buff;	
			LED_CS2 = 0x8F8F;
			break;
				
		case 0x20: 					//key-press 4
			kbd_buff=0x198F;
			LED_CS3 = kbd_buff;	
			LED_CS2 = 0x8F8F;	
			break;
					
		default: break;
			
		
	}

	switch (j)
	{
			
		case 0x00:					//key-press 5
			kbd_buff=0x8F12;
			LED_CS2 = kbd_buff;
			LED_CS3 = 0x8F8F;
			break;
					
		case 0x01:  				//key-press 6
			kbd_buff=0x028F;
			LED_CS2 = kbd_buff;
			LED_CS3 = 0x8F8F;  
			break;
					
		case 0x02:  				//key-press 7
			kbd_buff=0x8F78;
			LED_CS3 = kbd_buff;
			LED_CS2 = 0x8F8F;
			break;
					
		case 0x05: 					//key-press 8
			kbd_buff=0x008F;
			LED_CS3 = kbd_buff;
			LED_CS2 = 0x8F8F;
			break;
				
		default: break;
		
	}

}


void dummyOs(void)
{
 	
	unsigned short int temp = 0x8F8F;
	
	LED_CS2 = temp;		
	LED_CS3 = temp;
	

 	while(1) 
   	{
			//waiting for interrupt		
	}
	


}