/* * (C) Copyright 2006 * Detlev Zundel, DENX Software Engineering, dzu@denx.de. * * 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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 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 MPC5XXX_IRQ1 #else #define DFL_IRQ 0 #endif 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", irq); 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 ("+"); }