rt-thread/libcpu/arm/AT91SAM7X/interrupt.c

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/*
* File : trap.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://openlab.rt-thread.com/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2006-08-23 Bernard first version
*/
#include <rtthread.h>
#include "AT91SAM7X256.h"
#define MAX_HANDLERS 32
extern rt_uint32_t rt_interrupt_nest;
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
/**
* @addtogroup AT91SAM7
*/
/*@{*/
void rt_hw_interrupt_handler(int vector)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init()
{
rt_base_t index;
for (index = 0; index < MAX_HANDLERS; index ++)
{
AT91C_BASE_AIC->AIC_SVR[index] = (rt_uint32_t)rt_hw_interrupt_handler;
}
/* init interrupt nest, and context in thread sp */
rt_interrupt_nest = 0;
rt_interrupt_from_thread = 0;
rt_interrupt_to_thread = 0;
rt_thread_switch_interrupt_flag = 0;
}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(int vector)
{
/* disable interrupt */
AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
/* clear interrupt */
AT91C_BASE_AIC->AIC_ICCR = 1 << vector;
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
{
AT91C_BASE_AIC->AIC_IECR = 1 << vector;
}
/**
* This function will install a interrupt service routine to a interrupt.
* @param vector the interrupt number
* @param new_handler the interrupt service routine to be installed
* @param old_handler the old interrupt service routine
*/
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
if(vector >= 0 && vector < MAX_HANDLERS)
{
if (old_handler != RT_NULL) *old_handler = (rt_isr_handler_t)AT91C_BASE_AIC->AIC_SVR[vector];
if (new_handler != RT_NULL) AT91C_BASE_AIC->AIC_SVR[vector] = (rt_uint32_t)new_handler;
}
}
/*@}*/