66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/*
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* (C) Copyright 2006
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* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This is a very simple standalone application demonstrating
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* catching IRQs on the MPC52xx architecture.
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*
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* The interrupt to be intercepted can be specified as an argument
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* to the application. Specifying nothing will intercept IRQ1 on the
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* MPC5200 platform. On the CR825 carrier board from MicroSys this
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* maps to the ABORT switch :)
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*
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* Note that the specified vector is only a logical number specified
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* by the respective header file.
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*/
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#include <common.h>
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#include <exports.h>
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#include <config.h>
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#if defined(CONFIG_MPC5xxx)
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#define DFL_IRQ MPC5XXX_IRQ1
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#else
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#define DFL_IRQ 0
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#endif
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static void irq_handler (void *arg);
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int interrupt (int argc, char * const argv[])
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{
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int c, irq = -1;
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app_startup (argv);
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if (argc > 1)
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irq = simple_strtoul (argv[1], NULL, 0);
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if ((irq < 0) || (irq > NR_IRQS))
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irq = DFL_IRQ;
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printf ("Installing handler for irq vector %d and doing busy wait\n",
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irq);
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printf ("Press 'q' to quit\n");
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/* Install interrupt handler */
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install_hdlr (irq, irq_handler, NULL);
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while ((c = getc ()) != 'q') {
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printf ("Ok, ok, I am still alive!\n");
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}
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free_hdlr (irq);
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printf ("\nInterrupt handler has been uninstalled\n");
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return (0);
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}
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/*
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* Handler for interrupt
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*/
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static void irq_handler (void *arg)
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{
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/* just for demonstration */
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printf ("+");
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}
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