ext_irq.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : ext_irq.c
//* Object              : External interrupt handler for irq 
//*                     : Use LED5 & LED6 for status interrupt
//* 1.0 03/Jan/03 JPP   : Creation
//*----------------------------------------------------------------------------

// Include Standard LIB  files 
#include "eb40A.h"

int status_irq = 0 ;

//*----------------------------------------------------------------------------
//* Function Name       : at91_IRQ0_handler
//* Object              : Irq Handler called by the IRQ0 interrupt with AT91
//*                       compatibility
//* Input Parameters    : none
//* Output Parameters   : none
//*----------------------------------------------------------------------------
void at91_IRQ0_handler(void)
{
    if (status_irq == 0) status_irq = 1;
    else status_irq = 0 ;
    //* Read the output state
    if ( (AT91F_PIO_GetInput(AT91C_BASE_PIO) & LED6 ) == LED6 )
    {
        AT91F_PIO_ClearOutput( AT91C_BASE_PIO, LED6 );
    }
    else
    {
        AT91F_PIO_SetOutput( AT91C_BASE_PIO, LED6 );
    }
    //* while SW3 is push loop
    while ( (AT91F_PIO_GetInput(AT91C_BASE_PIO) & SW3_MASK ) != SW3_MASK );
}

//*----------------------------------------------------------------------------
//* Function Name       : FIQ_init_handler
//* Object              : Irq Handler called by the FIQ interrupt with AT91
//*                       compatibility
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_read, at91_pio_write
//*----------------------------------------------------------------------------
void FIQ_init_handler(void)
{
        AT91F_PIO_ClearOutput( AT91C_BASE_PIO, LED4 );
}