main.c

altera epxa1的例子程序

/*	Simple demonstration of using the Stripe Interrupt Controller.
*	This version sets the interrupt mode to 6 individual interrupts.
*
*	Author: ORC
*
* 	Copyright (c) Altera Corporation 2001.
* 	All rights reserved.
*/

#include <stdio.h>
#include "timer.h"
#include "stripe.h"
#include "int_ctrl00.h"
#include "irq.h"

void detect_mode(void);
int buffer[LIMIT], count;

int main(void)
{
	int i;
	
	// Initialize the stripe timer which is used as a stopwatch
	init_timer();
	
	// Detect interrupt mode set by irq_init function
	detect_mode();

	// Delay for 1 second to sample interrupts from the PLD
	delay(1);

	// Display interrupts that occurred in the PLD
	for (i = 0; i < count; i++)
	{
		// Don't display interrupts that occurred previously
		if ( buffer[i] != buffer[i-1] )
		{	
			switch(buffer[i])
			{			
				case PLDINT0_FIQ_PRI:
					printf("INT_PLD[0]\r\n");
					break;					

				case PLDINT1_IRQ_PRI:
					printf("INT_PLD[1]\r\n");
					break;	
							
				case PLDINT2_IRQ_PRI:
					printf("INT_PLD[2]\r\n");
					break;	

				case PLDINT3_IRQ_PRI:
					printf("INT_PLD[3]\r\n");
					break;	

				case PLDINT4_IRQ_PRI:
					printf("INT_PLD[4]\r\n");	
					break;	

				case PLDINT5_IRQ_PRI:
					printf("INT_PLD[5]\r\n");
					break;
					
				default:
					printf("unknown interrupt\r\n");
					break;
					
			} // switch	
		} // if
	} // for
	
	while(1);	
}

// Detect interrupt mode
void detect_mode(void)
{
	volatile unsigned int int_mode;
	
	// Read the Interrupt Mode register
	int_mode = *INT_MODE(EXC_INT_CTRL00_BASE) & INT_MODE_MODE_MSK;

	// Print interrupt mode detected
	switch(int_mode)
	{
		case INT_MODE_SIX_IND:
			printf("\r\n*** 6 Individual Interrupt Mode ***\r\n");
			break;
			
		case INT_MODE_SIX_PRI:
			printf("\r\n*** 6-bit Priority Mode ***\r\n");
			break;
			
		case INT_MODE_FIVE_PRI:
			printf("\r\n*** 5-bit Priority Mode ***\r\n");
			break;
			
		default:
			printf("\r\n*** Unknown Interrupt Mode ***\r\n");
			break;
	}
}