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ec0f7277 DZ |
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 | } |