irq.c

来自「altera epxa1的例子程序」· C语言 代码 · 共 71 行

/*
*    Simple interrupt controller intialisation and first level
*	 IRQ and FIQ handlers
*
*    Copyright (c) Altera Corporation 2000-2001.
*    All rights reserved.
*/

#include <stdio.h>
#include "stripe.h"
#include "int_ctrl00.h"
#include "uartcomm.h"



#define INT_CTRL00_TYPE (volatile unsigned int *)

#define UART_IRQ_PRI 2


void uart_irq_handler(void);

void irq_init(void)
{
	//Disable PLD interrupt 4 and 5 as they are not used in this example
	
	*INT_MC(EXC_INT_CTRL00_BASE) = 	INT_MC_P0_MSK | INT_MC_P1_MSK |INT_MC_P2_MSK | INT_MC_P3_MSK | INT_MC_P4_MSK | INT_MC_P5_MSK ;
		
	//Set priority for the interrupt
	
	*INT_PRIORITY_UA(EXC_INT_CTRL00_BASE)=UART_IRQ_PRI;
	
	//Enable the UART interrupt 
		
	*INT_MS(EXC_INT_CTRL00_BASE)=INT_MS_UA_MSK;
}

void CIrqHandler(void)
{
	volatile int irqID;
	
	irqID = *INT_ID(EXC_INT_CTRL00_BASE);

	switch (irqID)
	{
	
	case UART_IRQ_PRI:
		uart_irq_handler();
		break;
	default:
		/* This shouldn't happen, but let's trap it in case */
		printf("Unknown irq %#x",irqID);
		break;		
	}
	
	return;
}

void CFiqHandler(void)
{
	/* This shouldn't happen, but let's trap it just in case */
	puts("Unexpected FIQ\r\n");
	return;
}