111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2006-08-23 Bernard first version
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* 2013-03-29 aozima Modify the interrupt interface implementations.
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include "AT91SAM7X256.h"
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#define MAX_HANDLERS 32
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/* exception and interrupt handler table */
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struct rt_irq_desc irq_desc[MAX_HANDLERS];
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extern rt_uint32_t rt_interrupt_nest;
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rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
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rt_uint32_t rt_thread_switch_interrupt_flag;
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/**
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* @addtogroup AT91SAM7
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*/
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/*@{*/
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static void rt_hw_interrupt_handler(int vector, void *param)
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{
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rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
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}
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/**
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* This function will initialize hardware interrupt
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*/
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void rt_hw_interrupt_init(void)
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{
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rt_base_t index;
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/* init exceptions table */
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for(index=0; index < MAX_HANDLERS; index++)
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{
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irq_desc[index].handler = (rt_isr_handler_t)rt_hw_interrupt_handler;
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irq_desc[index].param = RT_NULL;
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}
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for (index = 0; index < MAX_HANDLERS; index ++)
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{
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AT91C_BASE_AIC->AIC_SVR[index] = (rt_uint32_t)rt_hw_interrupt_handler;
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}
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/* init interrupt nest, and context in thread sp */
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rt_interrupt_nest = 0;
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rt_interrupt_from_thread = 0;
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rt_interrupt_to_thread = 0;
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rt_thread_switch_interrupt_flag = 0;
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}
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/**
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* This function will mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_mask(int vector)
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{
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/* disable interrupt */
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AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
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/* clear interrupt */
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AT91C_BASE_AIC->AIC_ICCR = 1 << vector;
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}
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/**
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* This function will un-mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_umask(int vector)
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{
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AT91C_BASE_AIC->AIC_IECR = 1 << vector;
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}
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/**
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* This function will install a interrupt service routine to a interrupt.
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* @param vector the interrupt number
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* @param handler the interrupt service routine to be installed
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* @param param the parameter for interrupt service routine
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* @name unused.
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*
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* @return the old handler
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*/
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rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
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void *param, const char *name)
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{
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rt_isr_handler_t old_handler = RT_NULL;
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if(vector >= 0 && vector < MAX_HANDLERS)
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{
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old_handler = irq_desc[vector].handler;
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if (handler != RT_NULL)
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{
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irq_desc[vector].handler = (rt_isr_handler_t)handler;
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irq_desc[vector].param = param;
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}
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}
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return old_handler;
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}
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/*@}*/
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