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 this file must be
//*                       compiled in ARM mode (32 bits)
//*                     : Use LED5 & LED6 for status interrupt
//* 1.0 10/01/02 JPP    : Creation
//*----------------------------------------------------------------------------


#include    "parts/m42800/lib_m42800.h"
#include    "targets/eb42/eb42.h"

// only for check this variable on debugger
extern int count_timer0_interrupt;
extern int count_timer1_interrupt;

int status_irq = TRUE ;

//*----------------------------------------------------------------------------
//* Function Name       : at91_IRQ0_handler
//* Object              : Irq Handler called by the IRQ0 interrupt with AT91
//*                       compatibility
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_read, at91_pio_write
//*----------------------------------------------------------------------------
void at91_IRQ0_handler(void)
{
    if (status_irq == 0) status_irq = 1;
    else status_irq = 0 ;
    //* read the ouput state
    if ( (at91_pio_read ( &PIOB_DESC) & LED5 ) == LED5 )
    {
        at91_pio_write ( &PIOB_DESC, LED5, PIO_CLEAR_OUT );
    }
    else
    {
         at91_pio_write ( &PIOB_DESC, LED5, PIO_SET_OUT );
    }

}

//*----------------------------------------------------------------------------
//* Function Name       : FIQ_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_handler(void)
{
    if (status_irq == 0) status_irq = 1;
    else status_irq = 0;

    //* read the ouput state
    if ( (at91_pio_read ( &PIOB_DESC) & LED6 ) == LED6 )
    {
        at91_pio_write ( &PIOB_DESC, LED6, PIO_CLEAR_OUT );
    }
    else
    {
        at91_pio_write ( &PIOB_DESC, LED6, PIO_SET_OUT );
    }
}