| Detlev Zundel | 3f434df | 2006-09-01 15:02:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2006 |
| 3 | * Detlev Zundel, DENX Software Engineering, dzu@denx.de. |
| 4 | * |
| 5 | * See file CREDITS for list of people who contributed to this |
| 6 | * project. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | * |
| 23 | * This is a very simple standalone application demonstrating |
| 24 | * catching IRQs on the MPC52xx architecture. |
| 25 | * |
| 26 | * The interrupt to be intercepted can be specified as an argument |
| 27 | * to the application. Specifying nothing will intercept IRQ1 on the |
| 28 | * MPC5200 platform. On the CR825 carrier board from MicroSys this |
| 29 | * maps to the ABORT switch :) |
| 30 | * |
| 31 | * Note that the specified vector is only a logical number specified |
| 32 | * by the respective header file. |
| 33 | */ |
| 34 | |
| 35 | #include <common.h> |
| 36 | #include <exports.h> |
| 37 | #include <config.h> |
| 38 | |
| 39 | #if defined(CONFIG_MPC5xxx) |
| 40 | #define DFL_IRQ MPC5XXX_IRQ1 |
| 41 | #else |
| 42 | #define DFL_IRQ 0 |
| 43 | #endif |
| 44 | |
| 45 | static void irq_handler (void *arg); |
| 46 | |
| 47 | int interrupt (int argc, char *argv[]) |
| 48 | { |
| 49 | int c, irq = -1; |
| 50 | |
| 51 | app_startup (argv); |
| 52 | |
| 53 | if (argc > 1) |
| 54 | irq = simple_strtoul (argv[1], NULL, 0); |
| 55 | if ((irq < 0) || (irq > NR_IRQS)) |
| 56 | irq = DFL_IRQ; |
| 57 | |
| 58 | printf ("Installing handler for irq vector %d and doing busy wait\n", |
| 59 | irq); |
| 60 | printf ("Press 'q' to quit\n"); |
| 61 | |
| 62 | /* Install interrupt handler */ |
| 63 | install_hdlr (irq, irq_handler, NULL); |
| 64 | while ((c = getc ()) != 'q') { |
| 65 | printf ("Ok, ok, I am still alive!\n"); |
| 66 | } |
| 67 | |
| 68 | free_hdlr (irq); |
| 69 | printf ("\nInterrupt handler has been uninstalled\n"); |
| 70 | |
| 71 | return (0); |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Handler for interrupt |
| 76 | */ |
| 77 | static void irq_handler (void *arg) |
| 78 | { |
| 79 | /* just for demonstration */ |
| 80 | printf ("+"); |
| 81 | } |