irq.c

nxp的ARM9处理器LPC3180代码,提供了几乎所有的外设示例程序.

/*****************************************************************************
 *   irq.c: Interrupt handler C file for Philips LPC230x Family Microprocessors
 *
 *   Copyright(C) 2006, Philips Semiconductor
 *   All rights reserved.
 *
 *   History
 *   2005.10.01  ver 1.00    Prelimnary version, first Release
 *
******************************************************************************/
#include "LPC318x.h"			/* LPC310X Peripheral Registers	*/
#include "type.h"
#include "irq.h"

DWORD IntStatus;
HandlerAddr   IntVectTable[3][32];	/* 0 is MIC, 1 is SIC1, 2 is SIC2 */

/******************************************************************************
** Function name:		IRQ_Exception
**
** Descriptions:		Interrupt handler, called in the startup.s file.
**				Check all the bits in MIR first, then SIC1 and SIC2.
**
** parameters:			None
** Returned value:		None
** 
******************************************************************************/
void __irq IRQ_Exception( void )
{
    HandlerAddr IRQHandler;
    int i;

    /* The first while loop is to take care of MIC1 interrupts. */
    while ( (MIC_SR != 0) && (!(MIC_SR & 0x01)) && (!(MIC_SR & 0x02)) )
    {
	for ( i = 31; i >= 0; i-- )
	{
	    if ( MIC_SR & (1<<i) ) 
	    {
		if ( IntVectTable[0][i] != NULL )
		{
		    IRQHandler = IntVectTable[0][i];
		    if ( MIC_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {
			MIC_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		    (*IRQHandler)();
		}
		else
		{
		    if ( MIC_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {
			MIC_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		}
	    }
	}
    }

    /* If Sub1IRQn is not enabled in the MIC_ER, below while loop should never 
    be called. */ 
    while ( SIC1_SR != 0 )
    {
	IntStatus = SIC1_SR;
	for ( i = 31; i >= 0; i-- )
	{
	    if ( SIC1_SR & (1<<i) )
	    {
		if ( IntVectTable[1][i] != NULL )
	    	{
		    IRQHandler = IntVectTable[1][i];
		    if ( SIC1_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {		    
			SIC1_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		    (*IRQHandler)();
		}
		else	/* Bad thing happened, interrupt occurs, no handler installed */
		{
		    if ( SIC1_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {		
			SIC1_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		}
	    }
	}
    }

    /* If Sub2IRQn is not enabled in the MIC_ER, below while loop should never 
    be called. */
    while ( SIC2_SR != 0 )
    {
	IntStatus = SIC2_SR;
	for ( i = 31; i >= 0; i-- )
	{
	    if ( SIC2_SR & (1<<i) ) 
	    {
		if ( IntVectTable[2][i] != NULL )
		{
		    IRQHandler = IntVectTable[2][i];
		    if ( SIC2_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {	
			SIC2_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		    (*IRQHandler)();
		}
		else
		{
		    if ( SIC2_ATR & (1<<i) )	/* If edge trigger, clear interrupt status */
		    {	
			SIC2_RSR |= (1<<i);	/* No need to clear on level trigger */
		    }
		}
	    }
	}
    }
    return;
}

/******************************************************************************
** Function name:		FIQ_Exception
**
** Descriptions:		Fast interrupt handler, called in the startup.s.
**
** parameters:			None
** Returned value:		None
** 
******************************************************************************/
void __irq FIQ_Exception( void )
{
    while ( 1 );				   
}

/******************************************************************************
** Function name:		init_irq
**
** Descriptions:		Initialize interrupt controller.
** parameters:			None
** Returned value:		None
** 
******************************************************************************/
void init_irq(void) 
{
    DWORD i;

    MIC_ER = 0x0000;
    SIC1_ER = 0x0000;
    SIC2_ER = 0x0000;

    for (i = 0; i < 32; i++) 
    {
	IntVectTable[0][i] = (HandlerAddr)NULL;
	IntVectTable[1][i] = (HandlerAddr)NULL;
	IntVectTable[2][i] = (HandlerAddr)NULL;
    }
    return;
}

/******************************************************************************
** Function name:		Install_MIC
**
** Descriptions:		Install MIC.
** parameters:			Interrupt number, polarity, action type, and
**				peripheral interrupt handler
** Returned value:		None
** 
******************************************************************************/
void Install_MIC( BYTE IntNum, BYTE ActPol, BYTE ActType, HandlerAddr IRQHandler )
{
    if ( (IntNum < 32) && (IRQHandler != (HandlerAddr)NULL) ) 
    {                            
	if (ActPol == INT_LOW_LEVEL) 
	{
	    MIC_APR &= ~(1 << IntNum);		/* low level / falling edge */
	} 
	else 
	{
	    MIC_APR |= (1 << IntNum);		/* high level / rising edge */
	}

	if (ActType == INT_LEVEL_SENSITIVE) 
	{
	    MIC_ATR &= ~(1 << IntNum);		/* level trigger */
	} 
	else 
	{
	    MIC_ATR |= (1 << IntNum);		/* edge trigger */
	}

	IntVectTable[0][IntNum] = IRQHandler;	         
    }
    return;
}

/******************************************************************************
** Function name:		Enable_MIC
**
** Descriptions:		Enable MIC.
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Enable_MIC( BYTE IntNum )
{
    if ( IntNum < 32 )
    {
	MIC_ER  |= (1 << IntNum);	/* Enable the IntNum on MIC   */
    }
    return;
}

/******************************************************************************
** Function name:		Disable_MIC
**
** Descriptions:		Disable MIC.
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Disable_MIC( BYTE IntNum )
{
    if ( IntNum < 32 )
    {       
	MIC_ER &= ~(1 << IntNum);	/* Disable the IntNum on the MIC  */
    }
    return;
}

/******************************************************************************
** Function name:		Install_SIC1
**
** Descriptions:		Install SIC1
** parameters:			Interrupt number, polarity, action type, and
**				peripheral interrupt handlerNone
** Returned value:		None
** 
******************************************************************************/
void Install_SIC1( BYTE IntNum, BYTE ActPol, BYTE ActType, HandlerAddr IRQHandler )
{
    if ( (IntNum < 32) && (IRQHandler != (HandlerAddr)NULL) ) 
    {                            
	if (ActPol == INT_LOW_LEVEL) 
	{
	    SIC1_APR &= ~(1 << IntNum);	/* low level / falling edge */
	} 
	else 
	{
	    SIC1_APR |= (1 << IntNum);	/* high level / rising edge */
	}

	if (ActType == INT_LEVEL_SENSITIVE) 
	{
	    SIC1_ATR &= ~(1 << IntNum);	/* level trigger */
	} 
	else 
	{
	    SIC1_ATR |= (1 << IntNum);	/* edge trigger */
	}

	MIC_APR &= ~(1 << 0);	/* MIC is always low level / falling edge */
	MIC_ATR &= ~(1 << 0);	/* MIC is level trigger */
	IntVectTable[1][IntNum] = IRQHandler;  
    }
    return;                            
}
       
/******************************************************************************
** Function name:		Enable_SIC1
**
** Descriptions:		Enable MIC.
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Enable_SIC1( BYTE IntNum )
{
    if ( IntNum < 32 )
    {
	MIC_ER |= (1 << 0);		/* SUB1 IRQ is routed to MIC */
	SIC1_ER  |= (1 << IntNum);	/* Enable the IntNum on SIC1 */
    }
    return;
}

/******************************************************************************
** Function name:		Disable_SIC1
**
** Descriptions:		Disable SIC1
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Disable_SIC1( BYTE IntNum )
{
    if ( IntNum < 32 )
    {       
	SIC1_ER &= ~(1 << IntNum);	/* Disable the IntNum on the SIC1  */
    }
    return;
}

/******************************************************************************
** Function name:		Install_SIC2
**
** Descriptions:		Install SIC2
** parameters:			Interrupt number, polarity, action type, and
**				peripheral interrupt handler
** Returned value:		None
** 
******************************************************************************/
void Install_SIC2( BYTE IntNum, BYTE ActPol, BYTE ActType, HandlerAddr IRQHandler )
{
    if ( (IntNum < 32) && (IRQHandler != (HandlerAddr)NULL) ) 
    {                            
	if (ActPol == INT_LOW_LEVEL) 
	{
	    SIC2_APR &= ~(1 << IntNum);	/* low level / falling edge */
	} 
	else 
	{
	    SIC2_APR |= (1 << IntNum);	/* high level / rising edge */
	}

	if (ActType == INT_LEVEL_SENSITIVE) 
	{
	    SIC2_ATR &= ~(1 << IntNum);	/* level trigger */
	} 
	else 
	{
	    SIC2_ATR |= (1 << IntNum);	/* edge trigger */
	}

	MIC_APR &= ~(1 << 0);	/* MIC is always low level / falling edge */
	MIC_ATR &= ~(1 << 0);	/* MIC is level trigger */
	IntVectTable[2][IntNum] = IRQHandler;
    }
    return;                            
}

/******************************************************************************
** Function name:		Enable_SIC2
**
** Descriptions:		Enable SIC2
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Enable_SIC2( BYTE IntNum )
{
    if ( IntNum < 32 )
    {
	MIC_ER |= (1 << 1);		/* SUB2 IRQ is routed to MIC */
	SIC2_ER  |= (1 << IntNum);	/* Enable the IntNum on SIC2 */
    }
    return;
}
                       
/******************************************************************************
** Function name:		Disable_SIC2
**
** Descriptions:		Disable SIC2
** parameters:			Interrupt number
** Returned value:		None
** 
******************************************************************************/
void Disable_SIC2( BYTE IntNum )
{
    if ( IntNum < 32 )
    {       
	SIC2_ER &= ~(1 << IntNum);	/* Disable the IntNum on the SIC2  */
    }
    return;
}

/******************************************************************************
**                            End Of File
******************************************************************************/