|
|
|
|
/*
|
|
|
|
|
* (C) Copyright 2006
|
|
|
|
|
* Detlev Zundel, DENX Software Engineering, dzu@denx.de.
|
|
|
|
|
*
|
|
|
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
|
|
|
*
|
|
|
|
|
* 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 * const 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 ("+");
|
|
|
|
|
}
|
