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* (C) Copyright 2006
* Detlev Zundel, DENX Software Engineering,
* See file CREDITS for list of people who contributed to this
* project.
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
* This is a very simple standalone application demonstrating
* catching IRQs on the MPC52xx architecture.
* The interrupt to be intercepted can be specified as an argument
* to the application. Specifying nothing will intercept IRQ1 on the
* MPC5200 platform. On the CR825 carrier board from MicroSys this
* maps to the ABORT switch :)
* Note that the specified vector is only a logical number specified
* by the respective header file.
#include <common.h>
#include <exports.h>
#include <config.h>
#if defined(CONFIG_MPC5xxx)
#define DFL_IRQ 0
static void irq_handler (void *arg);
int interrupt (int argc, char *argv[])
int c, irq = -1;
app_startup (argv);
if (argc > 1)
irq = simple_strtoul (argv[1], NULL, 0);
if ((irq < 0) || (irq > NR_IRQS))
irq = DFL_IRQ;
printf ("Installing handler for irq vector %d and doing busy wait\n",
printf ("Press 'q' to quit\n");
/* Install interrupt handler */
install_hdlr (irq, irq_handler, NULL);
while ((c = getc ()) != 'q') {
printf ("Ok, ok, I am still alive!\n");
free_hdlr (irq);
printf ("\nInterrupt handler has been uninstalled\n");
return (0);
* Handler for interrupt
static void irq_handler (void *arg)
/* just for demonstration */
printf ("+");