ext_irq.c

来自「ARM入门的好帮手.包含了从简单到相对较复杂的程序.」· C语言 代码 · 共 77 行

//*----------------------------------------------------------------------------
//*      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_handler.c
//* Object              : External interrupt handler for irq this file must be
//*                       compiled in ARM mode (32 bits)
//*
//* 1.0 24/10/00 JPP    : Creation
//*----------------------------------------------------------------------------


#include    "parts/r40807/reg_r40807.h"
#include    "parts/r40807/lib_r40807.h"
#include    "targets/eb40/eb40.h"

//*----------------------------------------------------------------------------
//* Function Name       : ext_IRQ0_handler
//* Object              : Irq Handler called by the IRQ0 interrupt
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_read, at91_pio_write
//*----------------------------------------------------------------------------
__irq void ext_IRQ0_handler(void)
{

    //* read the ouput state
    if ( (at91_pio_read ( &PIO_DESC) & LED2 ) == LED2 )
    {
        at91_pio_write ( &PIO_DESC, LED2, PIO_CLEAR_OUT );
    }
    else
    {
         at91_pio_write ( &PIO_DESC, LED2, PIO_SET_OUT );
    }
    //* Mark the End of Interrupt on the AIC
    AIC_EOICR = 0;
}
//*----------------------------------------------------------------------------
//* Function Name       : ext_FIQ_handler
//* Object              : FIQ Handler called by the FIQ interrupt
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_read, at91_pio_write
//*----------------------------------------------------------------------------
__irq void ext_FIQ_handler(void)
{

    //* read the ouput state
    if ( (at91_pio_read ( &PIO_DESC) & LED2 ) == LED2 )
    {
        at91_pio_write ( &PIO_DESC, LED2, PIO_CLEAR_OUT );
    }
    else
    {
         at91_pio_write ( &PIO_DESC, LED2, PIO_SET_OUT );
    }
    //* Mark the End of Interrupt on the AIC
    AIC_EOICR = 0;
}
//*----------------------------------------------------------------------------
//* Function Name       : aic_sotfware_interrupt
//* Object              : Sofware interup function
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_pio_write
//*----------------------------------------------------------------------------
__irq void aic_sotfware_interrupt(void)
{
    at91_pio_write ( &PIO_DESC, LED3|LED2|LED1, PIO_SET_OUT );
}